05-10-12 Meeting � �
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Memo - �
To: Wastewater Advisory Committee
From: Anne Hurlburt,City Administrator
Date: May 4,2012 for May 10,2012 Meeting
Re: Background Information on Scandia's Wastewater Treatment Systems
At the first meeting of the Wastewater Advisory Committee, staff and consultants will be presenting
an overview of the city's current wastewater systems. The goal will be for each committee member to
gain a basic understanding of the city's systems and the current issues.
Prior to the meeting,we are providing some basic information to each member that will be.valuable
reference material going forward, as well as allow you prepare for the meeting with any questions you
might want addressed. There will be some additional handouts at the meeting. In your packets,you
will find the following:
1. Brief Overview of Scandia's Wastewater Systems (excerpt from 2009 Scandia
Comprehensive Plan, including location maps.)
2. E�sting City Ordinances Applicable to Wastewater
a. Ordinance No. 55 (4/16/96),relating to"Uptown"Centeral Community Sewage
Treatment System
b. Ordinance No. 108 (2/6/09),governing the"201"Community Sewage Treatment
System
c. Ordinance No. 112 (12/16/08), establishing user charges and connection fees for the
"201"system
3. Background on"201"Bliss Collector System
a. MPCA Operating Permit(Apri12,201-March 31,2015)
b. Memorandum dated September 26,2008, suimnarizing conclusions and analysis of
capacity of Bliss portion of 201 system
4. Background on"201"Anderson/Erickson Collector System
a. Washington County Operaring Permit(March 3, 2012—December 31,2012)
b. Drainfield Existing Condition and Capacity Assessment,March 9,2012, Stantec
Consulring Services,
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c. Memo dated March 12,2012 re: Anderson/Erickson Wastewater System Options,
Stantec
d. Memo dated April 12, 2012 re: Sampling of Monitoring Wells,Anderson/Erickson
Wastewater System, Stantec
5. Community Wastewater Treatment System,Operation and Maintenance Agreement
(between City of Scandia and Washington County re: the "201" Wastewater Treatment
Systems)
6. Background on"Uptown"Wastewater Treatment System
a. Washington County Operating Permit(January 1, 2012—December 31,2012)
b. Uptown Wastewater System Master Plan, September 2011,Bolton&Menk, Inc.
(excluding appendices)
c. Figure 1, Overall System Plan, Uptown Wastewater System Master Plan
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Communiry facilities include both buildings and services
that the Ciry provides to its cirizens and the general public.
Public Safery
The Ciry of Scandia Fire Department is located in the ,��.�� � �: ,;tf
recendy constructed Fire Hall on Scandia Trail/Highway ;;
97,which it shares with the Public Works Department. The � �"'�'�`�
City of Scandia Fire and Rescue has twenty-eight volunteers � w '� ' � �
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who respond to all medical emergencies: fourteen Emergen-
cy Medical Technicians and eight First Responders. On-site ,
fire training occurs twenty-four days per year. Scandia pro-
vides police services through a contract with tl�e Washington
County Sheriff's Department.
Senior/Community Center
The Scandia Senior/Community Center was built in 1986 and has become an important part
of community life. It is used by many groups and organizarions. It contains the ciry office,
City Council meeting chambers,a hall seating 220 for dinners,and a full service kitchen.
The hall can be rented for private parties,weddings,and other occasions.
Solid Waste Management
Scandia is serviced by two refuse haulers. Forest Lake Sanitarion,which uses the Washington
County Resource Recovery Facility in Newport;and Waste Management which uses their
own facility in Bruce,Wisconsin. Both companies provide for pick-up of reryclables.
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Private On-site Septic Systems
Wastewater treatment for the residents of Scandia consists prunarily of on-site septic
systems. Washington County has record of 1,394 on-site septic systems within the City of
Scandia. Responsibility for installation and maintenance of on-site septic systems lies with
the owner of the properry where the system is located. All systems must be installed and
maintained to meet the standards for individual subsurface sewage treatment systems (ISTS)
in Minnesota Bule.r Chapter 7080. The City has delegated responsibility for septic inspecuons
to Washington County. Washington County Ordinance 128,Section 172,requires owner's
of septic systems to have tanks pumped at least once every 3 years. Many lending insutu-
aons request inspecrions at the point of sale,and these inspections are recorded with the
County. If Waslungton County becomes aware of non-compliant systems,the County
requires replacement of those systems.
Public Wastewater Treatment Systems
In addition to on-site septic systems,there are three public wastewater treatment systems
located in Scandia that serve multiple lots and structures. The operarion,maintenance,and
user charges for these public systems are governed by City of Scandia Ordinance No. 108.
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Bliss Sewage Treatment Faciliry
The Bliss Sewage Treatment Facility's treatment area is located on the western side of Big
Marine Lake,off of Manning Trail North as shown on Map 16- Big Marine I�ke Area Wa.rte-
water Utilitie.r. The facility serves homes along Manning Trail North from the ueatment area
north to 191 st Sueet North. Service continues east along 191 st Street North to the homes
along Langley Ave.North,Layton Ave.North,Lamar Ave.North,and 185th Street North.
The facility currently serves 78 units and has the capaciry to serve 12 additional units. It pro-
cesses an annual average of 15,000 gallons per day,but has a permitted capacity of 19,800
gallons per day.
Anderson/Erikson Sewage Treatment Faciliry
The Anderson/Erikson Sewage Treatment Faciliry's treatment area is located on the eastern
side of Big Marine Lake at the southern end of Norell Ave.North. The system serves the
homes along Norrel Ave.North and those along 188th Sueet North to the intersection with
Newgate Ave.North as shown on Map 16 -Big Marine I�ke Area Wartewater Utilitier. Ap-
proximately 37 homes are located in the service area. 'I'he system could accommodate the
last two homes at the intersecrion of 188th and Newgate Ave.,but any other addiuons would
require additional studies to assess the system's capacity and possible expansion.
Village Wastewater Communiry Collector System
The Village Wastewater Community Collector System's treatment area is located on Olinda
Trail North, southeast of the village as shown on Map 17 - VillageArea Wa.rtewaterand Dnnk-
ing Waier Utilitie.r. The system serves Elim Lutheran Church and the parsonage,the Scandia
Cafe,the Scandia Store,the Scandia Veterinary Clinic,the Country Messenger,the bank
building,Schmitt Mall,the Community and Senior Center,and the C'Jammelgarden. The
system was expanded in 1999 for the Communiry Center and again in 2001 for the Gammel-
garden. A 2005 study indicated that the system is operating at appro�umately 90%capacity.
While the current system is an in-ground trench drainfield,future expansions will require the
installation of a mound system. The City owns land suitable for future expansion.
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As with waste water treatment,most residences and businesses in Scandia are served by on-
site drinking water wells installed and maintained by the landowner. There are three commu-
niry drinking water wells in the village area that serve mulriple residences and businesses. In
addirion,there is a public well serving the Fire Department and Public Works building. The
service areas and well locations are shown on Map 17 - Village Area IY/a.rtewater and Dnnking
Water Utilitie.r,and briefly described below
Minnesota Rules Chapter 4720 require the development of Wellhead Protection Plans
(WHPP). Scandia Elementary has worked with the Minnesota Department of Health and
completed Phase I of the WHPP. The City will eventually be required to complete WHPPs
for all public water supply systems.
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Map 16—Big Marine Lake Area Wastewater Utilities
City of Scandia 2008-�03a Comprehens'tve Plan ��
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City of Scandia
October 20, 2008
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Map 17 -Village Area Wastewater and Drinking Water Utilities
City of Scandi� 2008-�0�0 Carnp�ehensive Plan ��
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Public Well
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NEW SCANDIA TOWNSHIP
ORDINANCE NO. 55
AN ORDINANCE ESTABLISHING TBE CHARGES FOR THE OPERATION, ,
MAINTENANCE, AND ADMINISTRATION OF THE CENTRAL
CONIlKIJNI TY SEW'AGE TREATN�N'P SYSTEM �
101 Purpose . This Ordinance is adopted for the purpose of �
accruing revenues to enable the Town of New Scandia to repair, �
maintain and improve that certain central community sewage a
treatment system serving a portion of the business district of the �
Town of New Scandia with drain field situated on that real property �
in Washington County, Minnesota described as follows: �
The East 310 feet of that part of Lot 37 of Auditors Plat No. ;
6, Washington County, Minnesota lying northwesterly of the
center line of County State Aid Highway No. 3 (Olinda Trail
North) as presently traveled.
including all collector lines, pumps, holding tanks and any and all
other facilities comprising the system.
201. Definitions .
(1) Operation and Maintenance Costs . Expenditures for
activities required to provide for the dependable and ;
economical functioning of the sewage treatment system,
throughout its useful life and at the level of
performance for which the system was constructed.
Operation and maintenance costs include, but are not
limited to: monitoring and inspection of the system,
septic tank pumping, administration costs, replacement
costs including expenditures tor obtaining and
installing equipment, accessories or appurtenances to
maintain �he capacity and performance for which the
system was designed and constructed.
(2) User. A residential, business or other establishment
which is connected to the central community sewage j
treatment system.
(3) User CharQe. Charges to use�s of the system for the
costs of administration, operation, maintenance,
replacement, monitoring and inspection of the septic
system.
(4) Use� Charqe Svstem. A system based on the estimated use ;
of wastewater treatment services in which each user pays �
its proportionate share of the operation and maintenance �
costs of the system, including replacement, based on the
user ' s proportionate contribution to the total
wastewater loading from all users.
(5} Wastewater. The spent water of a user. From the �
standpoint of eource, it may be a combination of the
liquid and water carried waste from residences , �
businesses and institutions, together with any ground .
water, surface water and storm water that may be �
present. �
301 User Service Charcre Svstem._ �
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(1? The Town of New Scandia hereby establishes a user
service charge system whereby revenue collected from
users of the central community sewage treatment system
will be used to oftset all expenditures incurred for
administration, annual operation and maintenance and
equipment replacement. Al1 costs shall be recovered `
from the users of the system with each user paying its
�roportionate share of the costs of the system, �
including replacement based on the user' s proportionate ,
contributions to the total waste water loading from a11
users . The Town sha11 maintain a proper system of �
accounts suitable for determining the operatian, �
maintenance and equipment replacement costs of the
collection and treatment system. These costs shall be
reviewed at regular annual. intervals. The Town shall
determine whether or not sufficient revenue is being
generated for the effective operation, maintenance and
management of the wastewater system. The assignment of
percentage of usage shall be made by the Town. Users
may appeal the assignment of percentage of usage by
installing and maintaining, at the users own expense,
water meters of a type approved by the Town. Such
meters shall be equipped with remote registering
recorders located at an accessible site on the owner' s I
property. ,
{2) The percentage of usage shall be stated in terms of the
number of units of water used by each user with a unit
being defined as 100 gallons of water per day. Each user
shall pay a quarterly user fee of $20 . 00 per unit per
quarter. Payment shall be rendered in full within 30
days of the billing date.
(3) If the user discharges toxic pollutants ox wastes of
unusual strength or character to the treatment system
which cause damage to the system or increase the cost of
operation and maintenance, the user shall be ordered
either to install pretreatment facilities or pay for the j
extra costs of treating the waste.
(4) The Town hereby establishes a central sewage treatment
system service fund into which all revenues collected
from users will be deposited.
401 Enforcement .
401. 01 violations and Penalties. Any bill not paid thirty ;
(30) days after date of billing shall be declared �
delinquent and a past due notice shall be issued to
the billed party. The past due notice shall '
contain an additional charge of Ten ($10 . 00)
Dollars to cover the cost of rebilling. If a bill
still remains delinquent thirty (30) days after
rebilling, the Town may elect to take the following �
actions: �
(1) Whenever sewage treatment system service �
charge bi11.s become delinquent, the amount due a
shall be certified to the County Auditor for
inclusion with the following year' s tax �
statement. �
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(2) Lien. Whenever sewage treatment system bills
become delinquent, the same shall become and
constitute a lien upon the real estate to
which sewer system service is supplied .
Statements rendered for such charge ehall be
deemed notice to all parties, whether or not
the person charged with the statement is the
owner of the property served. The claim for
lien shall be made in the form of a sworn �
statement setting forth:
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(a) A description of the real estate , �
sutficient tor the identification thereof,
upon or for which the sewage service was �
supplied;
(b) The amount of money due for such sewage
service; and
(c) The date or dates when such amount or
amounts became delinquent.
If all amounts shown due remain unpaid after
recording as provided by State Statutes, the �
Town may foreclose the lien in the same manner
and with the same effect as the foreclosa.ng of
mortgages on real estate.
(3) The Town may, in its discretion, file suit in
a civil action to collect such amounts as are
delinquent and due against the occupant or
user of the real estate and shall collect, as
well, all attorneys fees incurred by the Town
in £iling the civil action. Such attorneys
fees shall be fixed by order of the Court.
(4) The Town may revoke discharge permits and
disconnect service to any user whenever
wastewater treatment charges become
delinquent.
Passed and adop�ed by the Town Board ot New Scandia Township this
�day o f Q�2.�_..Q , 19 9 6.
Charles �. NOr in, C airman .
ATTEST:
Do ores Peter on, own C er �
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CITY OF SCANDIA
ORDINANCE NO. 108
AN ORDINANCE GOVERNING THE "201" COMMUNITY
SEWAGE TREATMENT SYSTEM
The City Council of the City of Scandia, Washington County, Minnesota hereby ordains:
SECTION 1. TITLE.
This Ordinance shall be known, cited and referred to as the 201 Community Sewage
Treatment System Ordinance, except as referred to herein, where it shall be know, as "this
Ordinance."
SECTION 2. PURPOSE AND INTENT.
The purpose of this Ordinance is to establish the requirements and user charges for the
operation, maintenance and administration of community sewage treatment systems constructed
with "201" grant assistance and owned and operated by the City of Scandia. This Ordinance is
intended to provide for the collection of sufficient revenues to financially balance revenues and
expenditures for operation and maintenance of the system, and to provide for operation of the
system in accordance with all applicable laws and in an environmentally sound manner.
SECTION 3. RULES AND DEFINITIONS.
In the event of conflicting provisions in the text of this Ordinance, and/or other
Ordinances, the more restrictive provisions shall apply. The City Council shall deternune which
is more "restrictive." Words used in the present tense shall include the past and future tense; the
singular includes the plural and the plural includes the singular. The word "shall" is mandatory
and the word"may" is permissive.
The following terms are defined for purposed of this Ordinance:
Account. A record of periodic costs for sewer service provided to each property
connected to the Scandia"201" Community Sewage Treatment System.
City. The City of Scandia,Washington County, Minnesota.
Community Sewage Treatment System. A sewage treatment system constructed with
"201" grant assistance and owned and operated by the City, which collects sewage from two or
more residences consisting of: collector lines,pumps, sewage tanks and soil treatment unit.
User. A residential dwelling or other establishment connected to the Community Sewage
Treatment System.
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SECTION 4. CALCULATION OF USER CHARGES.
A. Prior to the beginning of each calendar year, the City Administrator shall prepare a
proposed budget for operation of the Community Sewage Treatment System, including
all costs for the operation,maintenance, replacement, and administration of the system.
Upon approval of said budget by the City Council, the amount of user charges needed
to balance revenues with expenditures shall be determined. The user charges shall be
apportioned among all the users of the system in equal amounts,to determine the base
user charge for the calendar year.
B. The base user charge may be subject to an energy charge adjustment. A user who
supplies power from the user's home electrical connection to a shared lift station may
be entitled to a deduction from the base user charge. Users who do not supply power
from the user's home electrical connection to any lift station, but who share a lift
station to which another user supplies electrical power, may be subject to an increase in
the base user charge.
C. A schedule of user charges and other fees shall be adopted from time to time by
ordinance of the City Council.
SECTION 5. ACCOUNTS.
A. All accounts shall be carried in the name of the owner of the property, at the mailing
address to which property tax bills are sent by Washington County unless a written
request for an alternative billing address is submitted to the city by the owner.
B. The owner shall be liable for the sewer service supplied to the property, whether he or
she is occupying the property or not, and any unpaid charges shall be a lien upon the
property.
SECTION 6. BILLING.
A. Bills shall be mailed for each account on or before the fifth day of March, June,
September and December of each year and specify the charges in accordance with the
current fee schedule set by ordinance of the City Council.
B. All charges shall be due upon receipt and considered delinquent after the fifth day of
the following month.
SECTION 7. DELINQUENT ACCOUNTS.
A. Late payment penalties shall be assessed on all delinquent accounts in accordance
with the fee schedule set by ordinance of the City Council.
B. Partial payments on delinquent accounts shall first be applied to any penalties and
then to user charges.
C. All delinquent accounts as of October 15 of each year shall be certified to the county
auditor for collection with taxes in the following year, according to the following
procedure:
a. Notice shall be sent to each account holder by first class mail of the delinquent
charges not less than 10 days prior to the date of a City Council hearing to
consider the charges proposed to be certified for collection with property taxes.
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b. The notice shall state that if payment is not made before the date for certification,
the entire amount plus penalties will be certified to the counry auditor for
collection as other taxes are collected.
c. A hearing shall be held by the City Council at its first meeting during the month
of November. Property owners with unpaid accounts shall have the opporiunity
to object to the certification of unpaid charges to be collected as taxes are
collected. If, after the hearing,the City Council finds that the amounts claimed as
delinquent are actually due and unpaid, and there is no legal reason why the
unpaid charges should not be certified for collection with taxes in accordance with
this ordinance, the City may certify the unpaid charges to the county auditar for
collection as other taxes are collected.
d. For each certification sustained, the property owner shall have the following
options after the hearing:
i. To pay the delinquent amount listed on the preliminary assessment roll,but
without additional interest after the hearing, within ten days of the hearing
date.
ii. To pay the certified charges as billed to the properiy owner by Washington
County on the owner's property tax statement with a collection term of one
year.
e. Fifteen days after the hearing, the certified roll, minus any payments, shall be
delivered to Washington County.
SECTION 8. CONNECTIONS TO THE COMMUNITY SEWAGE TREATMENT
SYSTEM.
A. New connections to the community sewage treatment system shall be prohibited unless
sufficient capacity is available in all downstream facilities. Connections shall be
limited to residential users only, and to properties adjacent to the existing collection
system.
B. No unauthorized person shall uncover, make any connections with, or opening into,
use, alter or disturb any portion of the system or appurtenance thereof without first
obtaining a written permit from the city or county as may be applicable.
C. All sewer connections shall conform to applicable requirements of the State Building
and Plumbing Code and all applicable rules and regulations of the city or county. All
connections shall be made gas-tight and water-tight, and verified by proper testing to
prevent the infusion of infiltration/inflow. Any deviation from the prescribed
procedures and materials shall be approved prior to installation. The connection and
inspection shall be made under the supervision of the city Building Official or his
designee.
D. New users connecting to the system shall pay to the city a sewer connection fee in
accordance with the current fee schedule set by Ordinance of the City Council.
SECTION 9. PROHIBITED WASTE DISCHARGES.
A. No user shall make or maintain connection of roof downspouts, exterior foundation
drains, surface runoff or groundwater to a building sewer or indirectly into the
community sewage treatment system.
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B. No user shall discharge into the community sewage treatment system any incompatible
waste, defined as waste that either singly by interaction with other wastes interferes
with any waste treatment process, constitutes a hazard to humans or animals, creates a
public nuisance, or creates an hazard in the treatment system.
C. No user shall discharge into the community sewage treatment system any wastewater
having a strength greater than that primarily produced by residential user, defined as
having a Biochemical Oxygen Demand(BODS) concentration of approximately
200/mg/1 and suspended solids concentration of approximately 225 mg/1.
SECTION 10. COST OF REPAIRS.
In addition to any penalties that may be imposed for violation of any provision of this
Ordinance, the City may assess against any user the cost of repairing or restoring sewers or
associated facilities damaged as a result of the discharge of prohibited wastes by the user, and
may collect such assessment as an additional charge for the use of the system or may pursue any
other method of collection of the costs it deems appropriate.
SECTION 11. SEVERABILITY.
If any provision of this Ordinance is found to be invalid for any reason by a court of
competent jurisdiction, the validity of the remaining provisions shall not be affected.
SECTION 12. ADMINISTRATION AND ENFORCEMENT.
A. The City Administrator shall be responsible for administration and enforcement of the
Ordinance, and the collection of the user charges as set forth in this Ordinance. The
City Council shall hear and decide appeals and review any order, decision or
determination made by the Administrator regarding the enforcement of this Ordinance.
B. The City hereby establishes a Sewage Treatment Service Fund into which all revenue
collected from users shall be deposited, and from which all expenditures necessary for
the operation and maintenance of the system shall be paid.
C. Any person who violates any provision of this Ordinance shall be guilty of a
misdemeanor, and upon conviction thereof, the violator shall be subject to a fine,
imprisonment or both, plus the cost of prosecution.
D. The City reserves the right to disconnect service to any user found to be in violation of
this Ordinance. Service shall not be disconnected until notice and an opportunity for a
hearing before the City Council have been provided to the occupant and to the owner of
the premises involved.
SECTION 13. REPEAL.
Any ordinance or provision of an ordinance heretofore existing pertaining to the subjects
treated in this ordinance, including Ordinance No. 24 (Wastewater Services Charge Ordinance),
shall be deemed repealed from and after the effective date of this ordinance.
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Passed and adopted by the City Council of the City of Scandia this 6th day of February, 2008.
Dennis D. Seefeldt, Mayor
ATTEST:
Anne Hurlburt, Clerk/Administrator
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CITY OF SCANDIA
ORDINANCE NO.: 112
AN ORDINANCE ESTABLISHING USER CHARGES AND CONNECTION FEES FOR
THE "201" COMMUNITY SEWAGE TREATMENT SYSTEM
The City Council of the City of Scandia,Washington County, Minnesota hereby ordains:
SecNon 1. ESTABLISHMENT OF USER CHARGES. User charges and fees for the "201"
Community Sewage Treatment System shall be as follows:
Fee
(A) Base use charge: $658.73 annually/
$164.68 quarterly
(B) Energy charge adjustment: $8.00 annually/
$2.00 quarterly
(C) Late payment fee: $10.00
(D) Annual interest rate on account balances 30 days 12%
past due:
(E) Annual interest rate on delinquent accounts certified 12%
for collection with property taxes:
(F) Connection fee,per dwelling unit: $4,250.00
Section 2. REPEALER. Ordinance No. 109 adopted February 6, 2008 is hereby repealed.
Section 3. EFFECTIVE DATE. This ordinance shall be in full force and effect on January 1,
2009, after publication according to law.
Passed and adopted by the City Council of the City of Scandia this 16th day of
December, 2008.
Dennis D. Seefeldt, Mayor
ATTEST:
Anne Hurlburt, Clerk/Administrator
, � ��
� �.� ���ii�-�r��sca�:� �-�«C�utic�� � �.��r�1�t-c��� ���r�t_ ��
�� 520 Lafayette Road North � St.Paul,MN 55155 4194 � 651 296-6300 � 800-675-3843 � 651-282-5332 TTY � www.pcastate.mn.us
R�CE�VEQ
April 2, 2010
a�� � � �a�o
The Honorable Dennis Seefeldt
Mayor, City of Scandia CITY OF SCANDIA
14727 - 209th Street North
Scandia, MN 55073
RE: Final Reissued State Disposal System (SDS) Permit No. MN0054119: Bliss Collector
T32N, R20W, Section 31, Scandia, Washington County, Minnesota
Dear Mayor Seefeldt:
Enclosed is the final State Disposal System (SDS) permit for your facility. This permit supersedes an
earlier SDS permit that was issued on December 29, 2004. No comments were received during the public
notice comment period.
It is the responsibility of the Permittee to maintain compliance with all of the terms and conditions of this
permit. Please carefully review the entire permit. A "Submittals Checklist" that is specific for your
facility is also enclosed for your use. You may find this checklist to be a convenient tool in tracking the
due dates and status of submittals required by the final issued permit. Not all of the permit requirements
are covered on the checklist, please read your permit to identify all permit requirements.
Special attention should be directed to the following:
Limits and Monitoring Requirements
The Volatile Organic monitoring requirement has been removed from the limits and monitoring section.
Chapter 1: Special Requirements
The permit contains the requirement to abandon two groundwater monitoring wells, GW002 (1 D) and
GW005 (3D), by July 1, 20l l. The Monitoring Well Abandonment Records must be submitted to the
MPCA by July 1, 2011.
Chapter 3. Waste Stream Stations
The flow monitoring information is now included in the WS001 station. To be representative of the total
influent flow to the system the flow must be measured prior to the treatment components. Because the
flow measurement is currently obtained from pump run time, this reading should be taken from the last
main lift station in the collection system and reported on the WS001 discharge monitoring reports.
Ch�ter 4. Large Subsurface Treatment System
The treatment system must be fenced and adequately protected. Specific requirements for the
maintenance of the system are included in this chapter.
St.Paul � Brainerd � Detroit lakes � Duluth � Mankato � Marshall � Rochester � Willmar � Printed on 100%post-consumer recyded paper
� STATE OF MINNESOTA
Minnesota Pollution Control Agency
Municipal Division
State Disposal System (SDS) Permit MN0054119
PERMITTEE: City of Scandia
FACILITY NAME: Bliss Collector Wastewater Treatment Facility
CITY: City of Scandia COUNTY: Washington
ISSUANCE DATE: Apri12,2010 EXPIRATION DATE: March 31,2015
The state of Minnesota, on behalf of its citizens through the Minnesota Pollution Control Agency(MPCA),
authorizes the Permittee to operate a disposal system at the facility named above, in accordance with the
requirements of this permit.
The goal of this permit is to protect water quality in accordance with Minnesota and US statutes and rules,
including Minn. Stat, chs. 1 l5 and l l6, Minn. R. chs. 7001, 7049, 7050, 7053, 7060 and the US Clean Water
Act.
This permit is effective on the issuance date identified above, and supersedes the previous permit that was issued
for this facility on December 29, 2004. This permit expires at midnight on the expiration date identified above.
Signature: � �
Gary L. Eddy, S ervisar for The Minnesota Pollution Control Agency
Municipal Wastewater Section
Municipal Division
Submit DMRs to: Questions on this permit?
Attention: Discharge Monitoring Reports • For DMR and other permit reporting issues, contact:
Minnesota Pollution Control Agency Tamara Dahl, 507-476-4252.
520 Lafayette Rd N
St Paul, MN 55155-4194 • For specific permit requirements or permit compliance
status, contact:
Submit Other WQ Reports to: Charly Wojtysiak, 651-757-2831.
Attention: WQ Submittals Center
Minnesota Pollution Control Agency • General permit or NPDES program questions, contact:
520 Lafayette Rd N MPCA, 651-282-6143 or 1-800-657-393 8.
St Paul, MN SS 155-4194
520 Lafayette Rd. N.; St. Paui, MN 55155-4194;651-296-6300(voice);651-282-5332(TTY)
Regional Offices: Duluth . Brainerd • Detroit Lakes • Marshall . Rochester
Equal Opportunity Empioyer • Printed on recycled paper containing at least l0%fibers from paper recycled by consumers
Page 3
Permit MN00541 19
Facility Description
The Bliss Collector Wastewater Treatment facility(Facility) is located at NW 1/4 of NE 1/4 of Section 31,
Township 32 North, Range 20 West, Scandia, Washington County, Minnesota. This is a Class D facility.
The existing Facility presently serves approximately 75 homes. There are 70 individual septic tanks and 46
shared STEP systems through which sewage passes before entering the collection system.
This Facility consists of small diameter for�e main, two lift stations, a stilling basin comprised of three septic
tanks in series (7,500 gallons total), a dosing station and three pass-through sand filter beds, and a dosing station
for filtered effluent going to a three-cell drainfield trench system. The drainfield system consists of three celis of
drop box drainfields with ten laterals each. One or two cells rest at any given time. The system is designed to
treat up to l 9,800 gallons per day. There are no known bypass points in this system. This is a class D system.
There are eight monitoring wells at this site,three up gradient (GW001, 2, 3)and four downgradient(GW004, 5,
6, 8). There are also nine piezometers (GW009-015). In this permit two monitoring wells, GW002 and GW005,
will be sealed and abandoned.
The location of designated monitoring stations is specified on the attached "Summary of Stations and
Station Locations" report. The location of the facility is shown on the attached topographical map.
Page 5
Permit MN0054119
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Permit Issued: Ap,il 02,2010 $]1SS COIIeCt01' Page 6
Pe��nit Expires: March 3(,ao�s Summary of Stations Permit#:MN0054119
Ground Water Stations
Station Tvpe of Station Local Name PLS Location
GW00] Well,LJpgradient MW- ]s NE Quarter of Section 31,Township 32 North,Range 20 West
GW003 Well, Upgradient MW-2s NE Quarter of Section 31,Township 32 North,Range 20 West
GW004 Well,Downgradient MW-3s NE Quarter of Section 31,Township 32 North,Range 20 West
GW006 Well,Downgradient MW-4s NE Quarter of Section 31,Township 32 North,Range 20 West
GW008 Weli,Downgradient MW-Sd NE Quarter of Section 31,Township 32 North,Range 20 West
GW009 Piezometer,Other Pz. a NE Quarter of Section 31,Township 32 North,Range 20 West
GW010 Piezometer,Other Pz. b NE Quarter of Section 31,Township 32 North,Range 20 West
GWO1 1 Piezometer,Other Pz. c NE Quarter of Section 31,Township 32 North,Range 20 West
GW012 Piezometer,Other Pz.d NE Quarter of Section 31,Township 32 North, Range 20 West
GW013 Piezometer,Other Pz. e NE Quarter of Section 31,Township 32 North, Range 20 West
GW014 Piezometer,Other Pz. f NE Quarter of Section 31,Township 32 North,Range 20 West
GW015 Piezometer,Other Pz.g NE Quarter of Section 31,Township 32 North,Range 20 West
GW016 Piezometer,Other Pz. h NE Quarter of Section 31,Township 32 North,Range 20 West
GW017 Piezometer,Other Pz. i NE Quarter of Section 31,Township 32 North,Range 20 West
Waste Stream Stations
Station Tvpe of Station Local Name PLS Location
WS001 Influent Waste Dosing Station 1 NE Quarter of Section 31,Township 32 North, Range 20 West
WS002 Intermediate: WW to Land Sand Filter Effluent,Dosing Station 2 NE Quarter of Section 31,Township 32 North,Range 20 West
�
Permit Issued Aprtl 02,20]0 Bliss Collector Page 7
Permit Expires: March 31,2015 Limits and Monitoring Requirements Permit#:MN0054119
The Permittee shall comply with the limits and monitoring requirements as specified below.
GW 001
-- -- _ _ � - - _ __- -, �__- ---
Parameter _ �, Limrt _�II Units ��' _ _Limit Type _ jj Effective Period��Sample Type!„`Frequencyl' Notes !
�Chlonde,Total -- - - . ll,_MOon�r JI', mg/L �I Instantaneous-Maximum II'i� -Apr Jul,Oct ii Grab �', 1 x Month fi, -=2 =�
-- -- , _ - Y '� _-- �il�_ g— - �- p - - __I __
_ _ _ Instantaneous � x Month 5 '
iLeve�tion of G o nalTotalt aMNan Sea MOonjtor feet Sin le Value A r Jul,Oct Measurement � I -
-- -- - ,_ _
Nitrogen,Am , ( s ) I Monitor mg/L i Single Value i� Apr,Jul,Oct Grab � 1 x Month �� 2 �
� �I� Only �� �,_ �� --��� ��, �'� i
__ , --- - - -- -- - -- -
--- ,- _ -
- . - _ - �- _ _ _ -_-- -- _ - - _
--
- _ =_ ;
�Nrtrogen,Kjeldahl,Total �� Monitor ', mg/L Single Value I Apr,Jul,Oct i Grab �, 1 x Month � 2 ;
I, - - ' _ OnIY , !�- -- ---- ---____._'�-. _-.
_
- - - - - _ _ -_- . -
-- -- _ ---- - ;; _ ,-
l_ _ g -- _( ) Only '�' g--- -- --- _ _ --- II� - p__ _- - _- 1 x Month `, 2 ��
Nitro en,Nitrate,Total as N Monitor m /L Instantaneous Maximum A r,Jul,Oct � Grab
- -- ---- _ -- — - _----- � - _ = - - - :
pH F�eld ,il Monitor ; SU il Single Value - 'I Apr Jul,Oct I� Grab � ] x Month �, 3 i
IPhosphorus,Total (as P) - _ _- i�`�Monit r ',;�-mg/L-l�r----Single Value �� Apr,Jul,Oct I� Grab !,� 1 x Month �;� �=2 - ,I
- - - -- _ _ _ - '` Only ;�' =-I,- - _---- �'--_-- -==-if .-- -
. , --- _ _ � '___ I
- - - _ _ - ---- _ _ _ -
,Specific Conductance,Field Monrtor . umh/cm ' Single Value �' Apr,Jul,Oct il Grab ' 1 x Month 9 3
Only I', k
___ � - - -'.__ __ _ I�
__ _ __ _ _ _
Temperature,Water Monitor Deg C ' Single Value 'll� Apr,Jul,Oct Grab ' 1 x Month 3 I
_ OnIY � _ - __ �__ _ _ _
GW 0a3, GW 004,GW 006,GW 008
_ g-- I� ___ __Yp =— Effephve Penod Sample Type'�Frequency�' Notes ,
Parameter Limit Umts L�mit T e I • �
_ -> - - -- _ - ..-- _
Chioride,Total � Monrtor m /L InstantanEous Max�mum A r,Jul,Oct Grab 1 x Month " 2 �
, Only ,
_ _ -, __ _ -- - - - _- -
, - � - - - - -- -- -
Elevation of GW Relative to Mean Seai Monitor ' feet �� Single Value II Apr,Jul,Oct �I Measurement,, 1 x Month ' S I
Level- - _ _ Only - _ - '�_ __ Instantaneous,' '
Nitrogen,Ammonia,Total(as N) Monitor ' mg/L i, Single Value 'i Apr,Jul,Oct i; Grab ' I x Month 4
' � Only : _ ' I
----- --, ;
_ - ' --- --_
_ _ ___ -,- _ _- - --
- - - - - - __ - --
-- _
T�litrogen,Kjeldahl,Total ; Monitor : mg/L �I Single Value ;� Apr,Jul,Oct �� Grab ' 1 x Month ; 4 �
_� g -� ) �- Onl g �__ - �� --�I -- - � - - ;
__-__ __
_ ' _Onl ;I �' _ — _-�� p -_- - , -2 -
Monrtor m /L Instantaneous Maximum� A r,Jul,Oct i Grab 1 x Month
�1'tro en,Nrtrate,Totai as N L Y ` __
� , _ - � -:- -
�- -
-- - --.------- -- `_ '
H,FieJd ', Monitor SU Smgle Value I� Apr,Jul Oct Grab 3 �
- 1 x Month �
I Only . , J
,_. ,_ __ - - _ _ - - - ____ - - _,_.
-_- -- -- -- -
-- � -- ,- _
!Phosphorus,Total(as P) Monitor mg/L Single Value �,� Apr,Jul,Oct , Grab 1 x Month i 4
i � Only
p — ._, -_ _ — __ ���-_°-_- --- - --!�-- = i „.__
__
. - Single Value �i Apr,Ju1,Oct Grab ] x Month ' _ 3 '
S ecific Conductance,Fieid Moniy r umh/cm; ,L -- ''` P ;
p Onl g I _ g== -_ - p -- - —_ -, r - -
Tem erature,Water Monitor De C Sin le Value � A r,Jul,Oct � Grab '� 1 x Month 4 3 !
- __ ,�_ On1Y J�, __ _��-___—_ _- -- �L---- _ _ II- -- 1 ' ,',
_ , --- ---. �
GW009,GWOlO,GWOII,GW012,GW013,GW014,GWO15,GW016,GW017
Effective_Period Sam le T e Fre uenc �
Parameter Limit �� Units ;'� Limrt Type -- ' - , I.I P_ YP-�I 9--- Y'i Notes 'i
-
- - ---
- - -- - - --- - -•
Separation to Ground Water Monitor in Single Value Apr,Jul,Oct Measurement 1 x Month 6
Only _, i
, �,
=--- �_- _ _ _ _ _ _ �
WS OOl
- _ _ _ --- __-- _ __ _ _ -
-- _
Parameter Limit I� Units I L�mit Type �i Effect�ve Period 'iSample Type;'Frequency Notes
_ �. _ _ ---- -
BOD,Carbonaceous OS Day(20 Deg Monitor mg/L Calendar Quarter Average ; Jan-Dec Grab 1 x Quarter
,C) , � Only ��
Permit I�sued: Apiil 02,2010 Bliss Collector Page 9
Permit Expires: March 31,2015 Permit#:MN0054119
Chapter l. Special Requirements
1. Special Requirements
1.1 The Permittee shall properly abandon monitoring wells GW002 (1D) and GW005 (3D) following the Minnesota
Department of Health's 4725 Well Code. The Permittee shall submit the Monitoring Well Abandonment recards
by June 30, 2011. �
Chapter 2. Ground Water Stations
L Monitoring Wells
1.1 The Permittee shall install, maintain and abandon ground water monitoring wells according to the Minnesota
Water Well Construction Code,Minnesota Rules, ch. 4725. Damaged or improperly constructed monitoring
wells shall be repaired or properly abandoned and replaced. Information on licensed water well contractors is
available from the Minnesota Department of Health.
1.2 The Permittee shall submit a detailed monitoring well log for each monitoring well at the facility and a detailed
US Geological Survey topographical map identifying the ]ocation of each well.
1.3 Each monitoring well shall be clearly numbered on the outside of the well with either indelible paint or an
inscribed number.
1.4 The monitoring wells shall be sampled in accordance with "Minnesota Pollution Control Agency,Water Quality
Division: Sampling Protocol for Ground Water Monitoring Wells, July 1997," Triplett, et. al. Copies of this
publication are available on the internet at http://www.pca.state.mn.us/water/groundwater/wqsampling.html or
may be obtained from the MPCA by calling 651-282-6143 or 800-657-3938.
1.5 Prior to well purging and sampling, depths to ground water shall be measured to the nearest 0.01 foot below the
top of the well casing, and ground water elevations shall be reported to the nearest 0.01 foot above mean sea
level.
1.6 Temperature, specific conductance and pH shall be reported as the final field measurements from well
stabilization.
2. Requirements for Specific Stations
2.1 GW 001, GW 003, GW 004, GW 006, GW 008, GW 009, GW 010, GW 011, GW 012, GW 013, GW 014, GW
015, GW 016, GW 017: Submit a monthly DMR monthly by 21 days after the end of each calendar month
following permit issuance.
Chapter 3. Waste Stream Stations
1. Requirements for Specific Stations
1.1 WS 001, WS 002: Submit a monthly DMR monthly by 21 days after the end of each calendar month following
permit issuance.
2. Sampling Location
2.1 Grab samples taken at WS001 shall be representative of total influent flow to the system.
2.2 Samples for Station WS002 shall be taken after the sand filters prior to entering the drainfield system. This
sample shal] be representative of the total facility discharge to land.
Permit I�sued April 02,2010 Bliss Collector Page I 1
Permit Expires: March 31,20]5 Permit#:MN00541 19
Chapter 4. Domestic Wastewater -- Large Subsurface Treatment System (LSTS)
8. Tank Maintenance
8.1 All tanks (primary, secondary, holding, dosing, individual, etc) associated with this system shall be operated,
pumped and maintained to ensure proper system operation and solids management. After every pumping event,
all tanks shall be inspected for potential failure (such as cracks,roots, damaged baffles, etc.). Identified
problems shall be corrected immediately.
8.2 The owner of a septic tank or tanks or the owner's agent must arrange far the removal and proper disposal of
septage from all tanks or compartments in which the top of the sludge layer is less than 12 inches below the
bottom of the outlet baffle or whenever the bottom of the scum layer is less than three inches above the outlet
baffle. All accumulations of sludge, scum, and liquids must be removed through the maintenance hole.
8.3 The Permittee shall properly clean the effluent screens as often as needed to maintain an adequate flow rate from
the septic tank(s). The Permittee shall keep a record at the facility that indicates the dates that the effluent �
screens are inspected,removed and cleaned.
8.4 Tanks that are not specifically covered under the Limits &Monitoring section of this permit shall be inspected
at least every three years and pumped as necessary unless more restrictive local requirements have been
established.
9. Soil Treatment System Maintenance
9.1 The soil treatment system(s) shall be adequately fenced.
9.2 A dense vegetative cover shall be maintained over the soil treatment system(s) at all times during the growing
season to prevent the growth of unwanted vegetation such as trees, deep rooted nuisance plants, aquatic
vegetation and to prevent erosion.
9.3 Routine maintenance shall be conducted to discourage the presence of rodents and other burrowing animals and
deer on the soil treatment system and to allow inspection of observation ports installed in the soil treatment
system(s) inspection pipes.
Soil Treatment System Inspection
9.4 Ponding depth inspections to determine the condition of each soil treatment system (trench,bed, at-grade,
mound, or drip dispersal)/drainfield standpipe shall be conducted every other month during the time the soil
treatment system is in use. The inspection of each soil treatment system shall include the identification of wet or
saturated areas, depth of effluent ponding in the soil treatment observation ports, evidence of effluent at the
surface, frozen components, and measurements in piezometers (if installed). Visual observations shal]be
recorded and inspection records shall be maintained by the owner for a minimum of three years following each
inspection. The results of the inspection are not required to be submitted to the MPCA but shall be made
available upon request by MPCA staff.
9.5 Indications of excessive hydraulic and organic loading to the wastewater treatment facility flow rate include
ineffective septic tanks or advanced treatment systems, prolonged saturated soil conditions, vegetative drowning
or excessive ground water mounding (observed from piezometers) and exceeding daily permitted flow rates as
indicated by flow meters, event counters and running time clocks.
Reserve Soil Treatment System
9.6 The reserve area for the soil treatment system/drainfield must be properly protected to prevent the use of, and
damage to, the area. The reserve area must be posted and identified for the public with at least one sign
designating its future purpose and the boundaries must be visibly staked at all corners. In no case may this area
be disturbed for any purpose, including vehicle traffic, storage, bike, hiking or ATV trails, playing fields, etc.
Permit]ssued: Apr'il 02,2010 Bliss Collector Page 13
Permit Expires: March 31,2015 Permit#:MN00541]9
Chapter 6. Pretreatment
2. Pretreatment- Permittee Responsibility to Control Users
2.3 The Permittee shall prohibit new discharges of non-contact cooling waters unless there is no cost effective
alternative. Existing discharges of non-contact cooling water to the Permittee's wastewater treatment facility
shall be eliminated, where elimination is cost-effective, or where an infiltration/inflow analysis and sewer
system evaluation survey indicates the need for such removal.
2.4 If the Permittee accepts trucked-in wastes, the Permittee shall evaluate the trucked in wastes prior to acceptance
in the same manner as it monitors sewered wastes. The Permittee shall accept trucked-in wastes only at
specifically designated points. (Minn. R. 7049.0140, Subp. 4)
2.5 Pollutant of concern means a pollutant that is or may be discharged by an industrial user that is, or reasonably
should be of concern on the basis that it may cause the permittee to violate any permit limits on the release of
pollutants. The following pollutants shall be evaluated to determine if they should be pollutants of concern:
pollutants limited in this permit, pollutants for which monitoring is required in this permit,pollutants that are
likely to cause inhibition of the Permittee's POTW,pollutants which may interfere with sludge disposal and
pollutants for which the Permittee's treatment facility has limited capacity. (Minn. R. 7049.0120, Subp. 13)
3. Control of Significant Industrial Users
3.1 The Permittee shall impose pretreatment requirements on SIUs which will ensure compliance with all applicable
effluent limitations and other requirements set forth in this permit or any federal or state law or regulation
limiting the release of pollutants from the POTW. These requirements shall be applied to SIUs by means of an
individual control mechanism. (Minn. R. 7049.0600)
3.2 The Permittee shall not knowingly enter into an individual control mechanism with any user that would allow
the user to contribute an amount or strength of wastewater that would cause violation of any limitation or
requirement in the permit, or any applicable federal, state or local law or regulation. (Minn. R. 7049.0600 Subp.
3)
4. Monitoring of Significant Industrial Users '
4.1 The Permittee shall obtain from SIUs specific information on the quality and quantity of the SIU's discharges to
the Permittee's POTW. Except where specifically requested by the Permittee and approved by the MPCA, this
information shall be obtained by means of representative monitoring conducted by the Permittee or by the SIU
under requirements imposed by the Permittee in the SIU's individual control mechanism. Monitoring performed
to comply with this requirement shall include al]pollutants for which the SIU is significant and shall be done at
a frequency commensurate with the significance of the SIU. (Minn. R. 7049.0710)
5. Reporting and Notification
5.1 If a SIU discharges to the POTW during a given calendar year, the Permittee shall submit a Pretreatment Annual
Report for that calendar year, due by January 31 of the following year. The Pretreatment Annual Report shall be
submitted on forms provided by the agency or shall provide equivalent information.
The Permittee shall submit the pre-treatment report to the following address:
MPCA
Attn: WQ Submittals Center
520 Lafayette Road North
St. Paul, Minnesota 55155-4194 (Minn. R. 7049.0720)
Peimit]ssued: Apr�l 02,2010 BI1SS COIICCt01' Page 15
Permit Expires: March 31,2015 Permit#: MN0054119
Chapter 8. Total Facility Requirements
1. General Requirements
General Requirements
1.1 No Discharge. There shall be no point source discharge to surface water from the permitted activity.
1.2 Incorporation by Reference. The following applicable federal and state laws are incorporated by reference in
this permit, are applicable to the Permittee, and are enforceable parts of this permit: 40 CFR pts. 122.41,
122.42, 136,403 and 503; Minn. R. pts. 7001, 7041, 7045, 7050, 7052, 7053, 7060, and 7080; and Minn. Stat.
Sec. 115 and 116.
1.3 Permittee Responsibility. The Permittee shall perform the actions or conduct the activity authorized by the
permit in compliance with the conditions of the permit and, if required, in accordance with the plans and
specifications approved by the Agency. (Minn. R. 7001.0150, subp. 3, item E)
1.4 Toxic Discharges Prohibited. Whether or not this permit includes effluent limitations for toxic pollutants, the
Permittee shall not discharge a toxic pollutant except according to Code of Federal Regulations, Title 40,
sections 400 to 460 and Minnesota Rules 7050, 7052, 7053 and any other applicable MPCA rules. (Minn. R.
7001.1090, subp.l, item A)
1.5 Nuisance Conditions Prohibited. The Permittee's discharge shall not cause any nuisance conditions including,
but not limited to: floating solids, scum and visible oil film, acutely toxic conditions to aquatic life, or other
adverse impact on the receiving water. (Minn. R. 7050.0210 subp. 2)
1.6 Property Rights. This permit does not convey a property right or an exclusive privilege. (Minn. R. 7001.0150,
subp. 3, item C)
1.7 Liability Exemption. In issuing this permit, the state and the MPCA assume no responsibility for damage to
persons,property, or the environment caused by the activities of the Permittee in the conduct of its actions,
including those activities authorized, directed, or undertaken under this permit. To the extent the state and the
MPCA may be liable far the activities of its employees, that liability is explicitly limited to that provided in the
Tort Claims Act. (Minn. R. 7001.0150, subp. 3, item O)
1.8 The MPCA's issuance of this permit does not obligate the MPCA to enforce local laws, rules, or plans beyond
what is authorized by Minnesota Statutes. (Minn. R. 7001.0150, subp.3, item D)
19 Liabilities. The MPCA's issuance of this permit does not release the Permittee from any liability,penalty or
duty imposed by Minnesota or federal statutes or rules or local ordinances, except the obligation to obtain the
permit. (Minn. R. 7001.0150, subp.3, item A)
1.10 The issuance of this permit does not prevent the future adoption by the MPCA of pollution contro] rules,
standards, or orders more stringent than those now in existence and does not prevent the enforcement of these
rules, standards, or orders against the Permittee. (Minn. R. 7001.0150, subp.3,item B)
1.11 Severability. The provisions of this permit are severable, and if any provisions of this permit, or the application
of any provision of this permit to any circumstance, is held invalid, the application of such provision to other
circumstances and the remainder of this permit shall not be affected thereby.
1.12 Compliance with Other Rules and Statutes. The Permittee shall comply with all applicable air quality, solid
waste, and hazardous waste statutes and rules in the operation and maintenance of the facility.
Permit Issued: Apr'il 02,2010 Bliss Collector Page 17
Permit Expires: March 31,2015 Permit#: MN00541]9
Chapter 8. Total FaciliTy Requirements
1. General Requirements
1.21 Completing Reports. The Permittee shall submit the results of the required sampling and monitoring activities
on the forms provided, specified, or approved by the MPCA. The information shall be recorded in the speci�ed
areas.on those forms and in the units specified. (Minn. R. 7001.1090, subp. 1, item D; Minn. R. 7001.0150,
subp. 2, item B)
Required forms may include:
DMR Supplementa] Form
Individual values for each sample and measurement must be recorded on the DMR Supplementa] Form which, if
required, will be provided by the MPCA. DMR Supplemental Forms shall be submitted with the appropriate
DMRs. You may design and use your own supplemental form; however it must be approved by the MPCA.
Note: Required summary information MUST also be recorded on the DMR. Summary information that is
submitted ONLY on the DMR Supplemental Form does not comply with the reporting requirements.
1.22 Submitting Reports. DMRs and DMR Supplemental Forms shall be submitted to:
MPCA
Attn: Discharge Monitoring Reports
520 Lafayette Road North
St. Paul, Minnesota 55155-4194.
DMRs and DMR Supplemental Formss shall be postmarked by the 21 st day of the month following the sampling
period or as otherwise specified in this permit. A DMR shall be submitted for each required station even if no
discharge occuned during the reporting period. (Minn. R. 7001.0150, subps. 2.B and 3.H)
Other reports required by this permit shall be postmarked by the date specified in the permit to:
MPCA
Attn: WQ Submittals Center
520 Lafayette Road North
St. Paul, Minnesota 55155-4194
1.23 Incomplete or Incorrect Reports. The Permittee shall immediately submit an amended report or DMR to the
MPCA upon discovery by the Permittee or notification by the MPCA that it has submitted an incomplete or
incorrect report or DMR. The amended report or DMR shall contain the missing or corrected data along with a
cover letter explaining the circumstances of the incomplete or incorrect report. (Minn. R. 7001.0150 subp. 3, ,
item G)
1.24 Required Signatures. All DMRs, forms,reports, and other documents submitted to the MPCA shall be signed by
the Permittee or the duly authorized representative of the Permittee. Minn. R. 7001.0150, subp. 2, item D. The
person or persons that sign the DMRs, forms,reports or other documents must certify that he or she understands
and complies with the certification requirements of Minn. R. 7001.0070 and 7001.0540, including the penalties
for submitting false information. Technical documents, such as design drawings and specifications and
engineering studies required to be submitted as part of a permit application or by permit conditions, must be
certified by a registered professional engineer. (Minn. R. 7001.0540)
Permit Issued: Ap:`il 02,2010 Bliss Collector Page 19 -
Permit Expires: March 31,2015 Permit#:MN00541]9
Chapter S. Total Facility Requirements
1. General Requirements
1.32 Unauthorized Releases of Wastewater Prohibited. Except for conditions specifically described in Minn. R.
7001.1090, subp. 1, items J and K, all unauthorized bypasses, overflows, discharges, spills, or other releases of
wastewater or materials to the environment, whether intentional or not, are prohibited. However, the MPCA
will consider the Permittee's compliance with permit requirements, frequency of release, quantity, type, location,
and other relevant factors when determining appropriate action. (40 CFR 122.41 and Minn. Stat. Sec 115.061)
1.33 Discovery of a release. Upon discovery of a release, the Permittee shall:
a. Take all reasonable steps to immediately end the release.
b. Notify the Minnesota Department of Public Safety Duty Officer at 1(800)422-0798 (toll free) or
(651)649-5451 (metro area) immediately upon discovery of the release. In addition, you may also contact the
MPCA during business hours at 1(800) 657-3864.
c. Recover as rapidly and as thoroughly as possible all substances and materials released or immediately take
other action as may be reasonably possible to minimize or abate pollution to waters of the state or potential
impacts to human health caused thereby. If the released materials or substances cannot be immediately or
completely recovered, the Permittee shall contact the MPCA. If directed by the MPCA, the Permittee shall
consult with other local, state or federal agencies (such as the Minnesota Department of Natural Resources
and/or the Wetland Conservation Act authority) for implementation of additional clean-up or remediation
activities in wetland or other sensihve areas.
d. Collect representative samples of the release. The Permittee shall sample the release for parameters of
concern immediately following discovery of the release. The Permittee may contact the MPCA during business
hours to discuss the sampling parameters and protocol. In addition, Feca] Coliform Bacteria samples shall be
collected where it is determined by the Permittee that the release contains or may contain sewage. If the release
cannot be immediately stopped, the Permittee shall consult with MPCA regarding additional sampling
requirements. Samples shall be collected at least, but not limited to, two times per week for as long as the_release
continues.
e. Submit the sampling results as directed by the MPCA. At a minimum, the results shall be submitted to the
MPCA with the next DMR.
1.34 Upset Defense. In the event of temporary noncompliance by the Permittee with an applicable effluent limitation
resulting from an upset at the Permittee's facility due to factors beyond the control of the Permittee, the
Permittee has an affirmative defense to an enforcement action brought by the Agency as a result of the
noncompliance if the Permittee demonstrates by a preponderance of competent evidence:
a. The specific cause of the upset;
b. That the upset was unintentional;
c. That the upset resulted from factors beyond the reasonable control of the Permittee and did not result from
operational error, improperly designed treatment facilities, inadequate treatment facilities, lack of preventative
maintenance, or increases in production which are beyond the design capability of the treatment facilities;
d. That at the time of the upset.the facility was being properly operated;
e. That the Permittee properly notified the Commissioner of the upset in accordance with Minn. R. 7001.1090,
subp. 1, item I; and
f. That the Permittee implemented the remedial measures required by Minn. R. 7001.0150, subp. 3, item J.
Permit lssued: Ap�:il 02,2010 BIISS COI�eCt01' Page 21
Permit Expires: March 31,2015 Permit#:MN0054119
Chapter 8. Total Facility Requirements
1. General Requirements
1.42 Report Changes. The Permittee shall give advance notice as soon as possible to the MPCA of any substantial
changes in operational procedures, activities that may alter the nature or frequency of the discharge, and/or
material factors that may affect compliance with the conditions of this permit. (Minn. R. 7001.0150, subp. 3,
item M) �
1.43 Chemical Additives. The Permittee shall receive prior written approval from the MPCA before increasing the
use of a chemical additive authorized by this permit, or using a chemical additive not authorized by this permit,
in quantities or concentrations that have the potential to change the characteristics,nature and/or quality of the
discharge.
The Permittee shall request approval for an increased or new use of a chemical additive at least 60 days, or as
soon as possible,before the proposed increased or new use.
This written request shall include at least the following information for the proposed additive:
a. The process for which the additive will be used;
b. Material Safety Data Sheet(MSDS) which shall include aquatic toxicity,human health, and environmental
fate information for the proposed additive;
c. A complete product use and instruction label;
d. The commercial and chemical names and Chemical Abstract Survey (CAS)number for all ingredients in the
additive (If the MSDS does not include information on chemical composition, including percentages for each
ingredient totaling to 100%, the Permittee shall contact the supplier to have this information provided); and
e. The proposed method of application, application frequency, concentration, and daily average and maximum
rates of use.
Upon review of the information submitted regarding the proposed chemical additive, the MPCA may require
additional information be submitted for consideration. This permit may be modified to restrict the use or
discharge of a chemical additive and include additional influent and effluent monitoring requirements.
Approval for the use of an additive shall not justify the exceedance of any effluent limitation nor shall it be used
as a defense against pollutant levels in the discharge causing or contributing to the violation of a water quality
standard. (Minn. R. 7001.0170)
1.44 MPCA Initiated Permit Modification, Suspension, or Revocation. The MPCA may modify or revoke and reissue
this permit pursuant to Minn. R. 7001.0170. The MPCA may revoke without reissuance this permit pursuant to
Minn. R. 7001.0180.
1.45 TMDL Impacts. Facilities that discharge to an impaired surface water,watershed or drainage basin may be
required to comply with additional permits or permit requirements, including additional restriction or relaxation
of limits and monitoring as authorized by the CWA 303(d)(4)(A) and 40 CFR 122.44.1.2.i., necessary to ensure
consistency with the assumptions and requirements of any applicable US EPA approved wasteload allocations
resulting from Total Maximum Daily Load (TMDL) studies.
1.46 Permit Transfer. The permit is not transferable to any person without the express written approval of the
� Agency after compliance with the requirements of Minn. R. 7001.0190. A person to whom the permit has been
transferred shall comply with the conditions of the permit. (Minn. R., 7001.0150, subp. 3, item N)
Permit lesued: April 02,2010 Submittals and Actions Checklist Page 1 of2
Permit Expires: March 31,20I5 Bliss Colleetor PeiYnit#:MN0054119
This checklist is intended to assist you in tracking the reporting requirements of your permiL However,it is only an aid. PLEASE
CONSULT YOLIR PERMIT FOR THE EXACT REQUIREMENTS.
Please note: This checklist only details submittal requirements for the next five years. DMRs,Annual Reports,and many other
submittals are required even after the expiration date of this permit,and continuc to be due until the permit is either reissued or
terminated.
Submit DMRs to: ; Submit other WQ reports to: MPCA Staff Contacts:
Attention: Discharge Monitoring Reports Attention: Submittals Center For DMR-related questions:
Minnesota Pollution Control Agency Minnesota Pollution Control Agency Tamara Dahl at(507�76-4252
520 Lafayette Rd N 520 Lafayette Rd N For other questions:
St. Paul, MN 55155 St. Paul, MN 55155 Charly Wojtysiak at(651)757-2831
2010
� Submit DMR(due before Jun 22)
❑ Submit DMR(due before Jul 22)
❑ Submit DMR(due before Aug 22)
� Submit DMR(due before Sep 22)
❑ Submit DMR(due before Oct 22)
� Submit DMR(due before Nov 22)
� Submit DMR(due before Dec 22)
2011
� Submit DMR(due before Jan 22)
� Submit DMR(due before Feb 22)
� Submit DMR(due before Mar 22)
� Submit DMR(due before Apr 22)
❑ Submit DMR(due before May 22)
� Submit DMR(due before Jun 22)
� Submit DMR(due before Jul 22)
� Submit DMR(due before Aug 22)
� Submit DMR(due before Sep 22)
� Submit DMR(due before Oct 22)
� Submit DMR(due before Nov 22)
� Submit DMR(due before Dec 22)
2012
� Submit DMR(due before Jan 22)
� Submit DMR(due before Feb 22)
❑ Submit DMR(due before Mar 22)
� Submit DMR(due before Apr 22)
� Submit DMR(due before May 22)
� Submit DMR(due before Jun 22)
❑ Submit DMR(due before Jul 22)
� Submit DMR(due before Aug 22)
� Submit DMR(due before Sep 22)
� Submit written notification of course completion(due before Oct 1)(Permit Req't.4.4.3}
� Submit DMR(due before Oct 22)
� Submit DMR(due before Nov 22)
❑ Submit DMR(due before Dec 22)
2013
� Submit DMR(due before Jan 22)
❑ Submit DMR(due before Feb 22)
� Submit DMR(due before Mar 22)
� Submit DMR(due before Apr 22)
❑ Submit DMR(due before May 22)
� Submit DMR(due before Jun 22)
❑ Submit DMR(due before Jul 22)
, ��:`--� .
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Memo
To: Mayor and City Council
Planning Commission
From: Anne Hurlburt,City Administrator
Date: September 26,2008
Re: Conclusions of September 23,2008 Meeting re: "201"Community Sewage
Treatment System
On Tuesday, September 23,2008,a meeting was held by a subcommittee of City Council and
Planning Commissioners to gather information regarding the status of the"201"community sewage
treatment system serving the Bliss Additions/Holiday Beach area of the city. In attendance were
Mayor Seefeldt, Council member Hametty, Planning Commission Chair Chris Ness and Planning
Commissioner Peter Schwarz. Also in attendance were Brad Bergo(19123 Layton),Doug Salmela
(19091 Layton),Tom Stanek(2312 130'�'Ct., Blaine),Pete Ganzel (Washington County Health Dept.)
and City Administrator Anne Hurlburt.
Mr. Ganzel presented an overview of the history, design and function of the sewer system. Ms.
Hurlburt reviewed the city's ordinances goverrung the system and presented her analysis of the
potential for additional connections to the system.
The findings and conclusions were as follows:
• The system is functioning well within the design and permitted limits of the system.
• At current volumes, only 4 trenches of 9 in each of the two active drainfields are being used.
There is probably space a�ailable at the site for additional drainfield area.
• The system experiences peaks in volumes that correspond with heavy rainfalls,when clean water
infiltrates into the system. Some of this comes from water falling on the sand filters but some is
probably coming from other sources, including sump pumps and other clean-water discharges at
individual homes.
• The engineering reports prepared by TKDA in 1994 and 2000 for the entire"201"system
concluded that there is capacity in the Bliss collector system for 89 residential connections. The
assumptions of these studies appear to remain valid and are probably conservative estimates of
system capacity.
1
• There have been questions raised whether or not it was expected or even allowed to connect new
homes constructed after the system was installed,or if it was intended that only homes existing at
that time could be connected. The TKDA studies were conducted partly for the purpose of
determining capacity for additional connections. And the system on the east side of Big Marine
Lake(Anderson-Erickson)was expanded to serve additional territory after the initial construction.
It does not appear that there was or is any prohibition on new home connections.
• There are currently 76 connections to the Bliss area system,most of which are permanent
dwellings. Seventeen(17)are listed as"seasonal"for property t�purposes.
• There are 5 existing homes that are adjacent to the collection system that are not currently
connected. System capacity should be reserved for these homes. There is one vacant site where a
home was previously connected to the system. Constructing a new home on this site would
require approval of a variance.
• There are two parcels that were previously denied a variance for a single home(Feb. 2000)which
would be considered unbuildable at this time. There is also a vacant lot(Lot 16,Holiday Beach)
owned by"Holiday Beach LLC"that would not be expected to become a building site.
• Staff's analysis found 17 vacant lots(including the Stanek parcel)for which the owners could
potentially request variances. This assumes that all parcels in contiguous ownership(including
those separated by road right-of-way)constitute a single"lot"per the city's Zoning Ordinance and
Shoreland Overlay district requirements. It is apparent that many of these lots would not be
buildable due to physical factors such as dimensions or wetlands. Others may ha�e been in
contiguous ownership with other parcels after that regulation went into effect. The ownership
history would need to be examined as part of a variance review. Should variances be requested for
any of the vacant lots,the city would examine all of the relevant factors and would likely find
grounds to deny many of them.
• If the system has capacity far at least 89 connections,76 are currently used and 5 are reserved for
existing homes that have not yet connected to the system,there would be room for 8 additional
connections.
• The City's ordinance(Ordinance No. 108)prohibits new connections to the system for non-
residential uses. Only property adjacent to the existing collector system may be connected,and
only if capacity exists in the system. Since any new homes/connections will require variances,
there is a procedure in place to determine that the criteria are met.
• If there are concems about capacity in the future,the city may want to consider implementing
conservation measures(such as requiring low-flow plumbing fixtures)or taking measures to
eliminate clear water discharges to the system(such as mandatory inspection and disconnection of
sump pumps.)
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Department of Public
�`�7� � � Lowell Johnson
t�,�
Director
��O�n� WASTEWATER TREATMENT Sue Hedlund
AND DISPERAL OPERATING PERMIT Deputy Director
OPERATING PERMIT NO. OP 0400-1
SYSTEM NAME: Anderson-Erickson Collector
PERMITTEE NAME: City of Scandia
ADDRESS: 14727 209th St N
Scandia, MN 55073
PH O N E: 651-433-2274
PROPERTY ID. NUMBER (GIS LOCATION): 34032-20-34-0004
SERVICE PROVIDER: Pete Ganzei, C8�B Excavating
SERVICE PROVIDER PHONE: 430-6676, 433-3986
Washington County authorizes the Permittee to operate a Subsurface Sewage
Treatment System in accordance with the requirements of this operating permit.
ISSUANCE DATE: 3/9/2012 EXPIRATION DATE: 12/31/2012
SYSTEM TYPE: Type I TREATMENT LEVEL: C
SYSTEM DESIGN FLOW: 6700
RESIDENTIAL/COMMERCIAL: Residential
SYSTEM COMPONENTS: Septic Tanks, Lift Station and Gravity Drainfield
• 29 Individual Septic Tanks
• 25 STEP Stations
• Pre-Treatment Device: None
• Pump Tank: 3000
• Soil Treatment Area: 6750 lineal 1ft wide. Divided into 3 cells with 2250 each.
Government Center • 14949 62nd Street North—P.O. Box 6,Stillwater, Minnesota 55082-0006
Phone: 651-430-6655 • Fax: 651-430-6730 • TTY: 651-430-6246
Service Centers also located in Cottage Grove and Forest Lake
www.co.washinqton.mn.us
Equal Employment Opportunity/Affirmative Action
REPORTED MONITORING REQUIREMENTS
PARAMETER TARGET LIMITS FREQUENCY LOCATION
Peak Flow GPD 8600 Dail Main Lift Station
Avera e Flow GPD 5300 Monthl Main Lift Station
cBo�S m /L 125 Reference Main Lift Station
TSS m i� 60 Reference Main Lift Station
Total Nitro en m /L 20 Reference Main Lift Station
Field Tests:Tem erature, H, D.O.
No Surface Discharge, Ponding to
Pondin /Surfacin in Soil Treatment Area Dro Box 4, Sin le Cell Active Quarterl Drainfield
MONITORING PROTOCOL
Any sampling and laboratory testing procedures shall be performed in accordance with the proprietary treatment producYs protocol,
Standard Methods,and at a Minnesota Department of Health approved laboratory. Results shall be submitted to the Washington
County Department of Public Health& Environment within 20 days of sampling. Samples must be representative of the flow.
Wastewater samples are expected to be taken during average to peak flow events to the greatest extent practical
MAINTENANCE REQUIREMENTS
SYSTEM COMPONENT MAINTENANCE FREQUENCY
Se tic Tanks Pum in /Cleanin of Individual Se tic Tanks Eve 3 Years
Semi-Annual or as
STEP Tanks and Controls O erational check, um current draw Am s needed
Main Lift Tank and Controls Ins ect for dama e,function, um current draw Am s Monthl
Inspect for damage,function. Mowing as needed, Gopher
Soil Treatment and Dis ersal Control Monthl
CONTINGENCY PLAN
In the event the wastewater treatment system does not meet required performance requirements as contained in this operating permit,
the Permittee shall notify the Department within 30 days of non-compliance.
AUTHORIZATION
This permit is effective on the issuance date identified above.This permit and the authorization to treat and disperse wastewater shall
expire in one year.The Permittee is not authorized to discharge after the above date of expiration.The Permittee shall submit
monitoring information and forms as required by the Washington County Department of Public Health 8 Environment no later than sixty
(60)days prior to the above date of expiration for operating permit renewal.This permit is not transferable to person or place.
The Permittee is required to obtain the services of a Minnesota Pollution Control Agency(MPCA)licensed 1)Service Provider to
perform ongoing system operation, maintenance, and monitoring and 2)Maintainer to pump the system's sewage tanks and
components. Submit a copy of the signed contract between the Permittee and the licensed Service Provider. If the Permittee fails to
comply with the provisions of this operation permit, the Permittee understands that penalties may be issued. If the Permittee sells this
property during the life of the permit,the Permittee will inform the new owner(s)of the permit requirements and the need to renew the
operating permit.
Any extension or new connections to the collection system must be approved by the permitting authority based on collection system
and soil treatment area capacity.
Page 2 of 3
�-
Additionai Conditions;
Reporting to the County shall be quarterly but flow readings should be recorded at least monthiy or
more frequently as determined by the operator. A method of recording actual daily(not average) flow
is desirable.
Pumps shall be calibrated annually or immediately after alteration of piping or any noted change in
pump or panel function and alternation of drainfields.
Reference Sampling is a single effluent sample to establish wastewater characteristics.
Report ponding as active trenches, drop boxes 1 to 4. Cells 1,2,3.
Dosing alternation, frequency and duration, should be as recommended by the City Engineer, or as a
minimum, each drainfield cell should be dosed on a rotation basis for one year.
Recommended Groundwater Monitoring;
Sample downgradient well DS for nitrate nitrogen.
Use Well E as a piezometer to evaluate mounding under drainfield.
Before 1/1/2013
Replace main lift station pump elapsed time clocks.
Make repairs or find alternate for automatic drain back valve on dosing force main.
Before 1/1/2014
Investigate repair of electric dosing vafves to allow automatic alternation of drainfields.
THE OPERATING PERMIT IS HEREBY GRANTED TO Clt�/ Of SCaC1CIla
Permitting Authority Chris LeClair
Title: Sr. Environmental Saecialist
Date:March 09,2012
C��a�� `_J �
��____
Signature:
Page 3 of 3
• � /�//.
DRAINFIELD EXISTING CONDITION
AND CAPACITY ASSESSMENT
AndersoNErickson System
Scandia, Minnesota
�
�
-,..__
Stan�ec
DRAINFIELD EXISTING CONDITION AND
CAPACITY ASSESSMENT
Anderson/Erickson System
Scandia, Minnesota
STANTEC Project Number: 193802153
Submitted by:
Stantec Consulting Services, Inc.
3717 23`� Street South
Saint Cloud, MN 5fi301
Prepared for:
The City of Scandia
14727 - 209th Street North
Scandia, MN 55073
March 9, 2012
Prepared by:
Clinton D. Jordahl, PG
Senior Geologist
Inspector Advanced Designer#7298
Reviewed by:
Ryan Goodman, PE
Project Manager
�n�
DRAINFIELD EXISTING CONDITION AND CAPAClTY ASSESSMENT
Anderson/Erickson System - Scandia, MN
Table of Contents
EXECUTIVESUMMARY ........................................................................................................ E.1
1.0 INTRODUCTION.............................................................................................................1
1.1 PURPOSE...................................................................................................... ...........1
1.2 SCOPE OF ASSESSMENT...............................................................................................1
1.3 BACKGROUND.................................................................................................................1
1.4 RECORDS REVIEWED. .2
...................................................................................................
2.0 COLLECTION AND TREATMENT SYSTEM REVIEW...................................................3
2.1 EXISTING COLLECTION SYSTEM...................................................................................3
2.2 EXISITING TREATMENT SYSTEM...................................................................................3
2.3 CURRENT FLOW INFORMATION ....................................................................................4
2.4 OPERATIONAL RECOMMENDATIONS............................................................................4
3.0 CAPACITY EXPANSION RECOMMENDATIONS..........................................................6
3.1 EXPANSION WITHIN EXISTING DRAINFEILD AREA......................................................6
3.2 PRETREATMENT OPTIONS.............................................................................................7
3.3 ACQUISITION OF ADDITIONAL LAND.............................................................................8
4.0 FINANCIAL CONSIDERATIONS....................................................................................9
4.1 MAINTENACE OF EXISTING SYSTEM ............................................................................9
4.2 SYSTEM REPAIR..............................................................................................................9
4.3 SYSTEM EXPANSION .10
...................................................................................................
5.0 DISCUSSION AND CONCLUSIONS............................................................................11
FIGURES
FIGURE 1: Area Map 1 &Area Map 2
APPENDICES
APPENDIX A: Custom Soil Survey—Washington County
APPENDIX B: Soil Borings Logs and Location Map
193802153 �
March 9,2012
Stantec
DRAINFIELD EXISTING CONDITION AND CAPACITY ASSESSMENT
Anderson/Erickson System - Scandia, MN
Executive Summary
The existing Anderson/Erickson drainfield was designed in 1986 to treat up to 6,700 gallons per
day but is currently being operated with only half of the designed infiltration area and with flows
consistently exceeding 7500 gallons per day during the peak summer months. Although the
system appears to be hydraulically functioning (i.e. not backing up to the surface), this loading
rate is significantly over that called for in the original design, and the prescriptive soil loading
rates currently presumed to provide an acceptable level of nutrient and pathogen reduction.
Unless there is a commitment on the part of the City to upgrade or replace the current system;
we can not recommend the connection of additional homes or cabins to the system at this time.
The full design capacity of 6,700 gallons per day could be realized by restoring the planned
drainfield dosing functionality, which we recommend; however with summertime peak flows
exceeding 7,500 gallons per day, the system is already being operated over capacity. We
recommend some consideration be given to a longer term solution that would meet not only the
immediate need, but would also allow additional connections along the service area where the
City has already installed collection pipe. Furthermore, as many as 18 of the 30 properties
currently served by the system appear to be in seasonal use. Conversion of any of these
properties to year-round use would increase the flow to the system without any additional
connections and such property use conversion is beyond the Ciry's ability to control.
The residual drainfield area owned by the City would allow for some limited expansion of the
system. Given the soil conditions on the property, an elevated bed or mound would be required.
Additional capacity in the range of about 2,000 to 2,500 gallons per day appears to be
achievable within the remaining area, but acquiring additional adjacent property upon which to
expand the system could ultimately provide greater capacity and provide for the eventual
replacement of the system.
The existing drainfield could be loaded at a higher rate 'rf the septic tank effluent were to be
pretreated. This would require the installation of some type of pretreatment device such as a
sand filter or proprietary registered treatment product. If the effluent were to be pretreated, it
would need to be distributed by pressure pipe along the length of the tranches. Therefore
additional tanks and pumps at the treatment site and some mod'rfication of the drainfield would
be required.
Expansion or pretreaiment couid increase the capacity of the system to allow daily flow rates
greater than 10,000 gallons. Increasing the capacity to 10,000 gallon per day or greater would
move the system from a County-permitted system to a State-permitted system. We understand
that City already owns a State-permitted system and we recommend that the regulatory
implications of increased capacity be cohsidered.
193802153
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March 9,2012
��
DRAINFIELD EXISTING CONDITION AND CAPACITY ASSESSMENT
Anderson/Erickson System —Scandia, MN
1.0 INTRODUCTION
1.1 PURPOSE
Stantec Consulting Services, Inc. (Stantec)was engaged by the City of Scandia {City) to
complete an assessment of the existing "AndersonlErickson" wastewater collection and
treatment system, which serves homes and cabins generally located along the eastern
shoreline of Big Marine Lake in Washington County Minnesota.
1.2 SCOPE OF ASSESSMENT
Our agreement with the City included the completion of the following tasks:
Task 1 —Collection and Treatment System Review
. Conduct a site visit with Washington County staff to physicaily walk the drainfield site
and verify the treatment system site conditions.
. A review the current operations, maintenance practices, and records management.
• Provide comments on operational procedures and relatively simple system
repairs/upgrades that have the potential to improve the system's performance and
e�end the drainfield's life.
• Complete hand-auger soil borings in the residual treatment area to determine iYs
suitability for possible expansion of the soil treatment and dispersal system.
. Make recommendations for soil treatment system expansion or pretreatment that would
allow additional connections to the system over the defined senrice area.
Task 2 —Drainfield Expansion Recommendations
. Provide recommendations on expanding the existing drainfield and/or adding
pretreatment to serve all properties in the desired area to be defined by the City.
Task 3— Prepare Fnancial Costs of Improvements
. Provide financial planning recommendations to fund system maintenance, system repair,
and system expansion and replacement.
1.3 BACKGROUND
In 1987,Washington County completed construction of the"AndersoNErickson"system to
provide wastewater collection and treatment for 21 dwellings on the east side of Big Marine
Lake. The system was constructed utilizing grant assistance from the United States
Environmental Protection Agency and State of Minnesota known as the"201" program.
The cluster system includes individual septic tanks at each property, a septic tank effluent
pumping system (STEP) where necessary, lateral sewer pipes, pressure and gravity sewer
collection pipes, and a conventional drainfield treatment system. Property owner's responsibility
and ownership extends to the septic tank. The actual septic tank and everything beyond,
193B02153 1
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DRAINFIELD EXISTING CONDITION AND CAPACITY ASSESSMENT
Anderson/Erickson System—Scandia, MN
including all STEP stations, collection infrastructure, and the treatment facility itself is owned by
the City.
The Anderson/Erickson System was originally owned and operated by Washington County
along with two other systems {the Bliss Area System and Carnelian Hills System) under a State
Disposal System (SDS) permit issued by the Minnesota Pollution Control Agency (MPCA).
Ownership and operati�nal responsibility for the AndersoNErickson and Bliss Systems was
subsequently transferred to Scandia Township (now the City of Scandia), and although the Bliss
system continues to be operated under an SDS permit, the Anderson/Erickson System was
dropped from the MPCA's permit program early in its operational life due to the low monthly
flows recorded at that time. Through a contract with the City (previously Scandia Township),
Washington County has provided the basic operation and maintenance for both the Bliss and
Anderson/Erickson Systems since the transfer of ownership.
1.4 RECORDS REVIEWED
The following resources were used in the preparation of this plan and copies are available at the
City Hall for reference:
• 1989 - Portions of the Anderson/Erickson Operatian and Maintenance Manual provided
by Washington County (Section 1, 9 pages;and Section 3, 49 pages)
• 1994— Report on Available Capacity, Carnelian Hills, Bliss and AndersoNErickson"201„
Treatment and Disposal Systems prepared by Toltz, King, Duvall, Anderson and
Associates, Inc. (TKDA)
• 2000— Update on the 1994 Report on Available Capacity, Carnelian Hills, Bliss and
AndersoNErickson"201"Treatment a�d Disposal Systems,TKDA
• 2001 — Record Plans, 188`h - Norell - 185"' Street Improvements& Sanitary Forcemain
Extension (Anderson-Erickson System), Bonestroo Rosene Anderlik, &Associates (now
Stantec)
. 2002 -Wastewater System Management Plan, New Scandia Township, Bonestroo (now
Stantec)
• 2011 —Spread sheet with system flow information for the period 4/28/04 to 10/17/11
. 2011 —Anderson-Erickson Collector System—Notes, City of Scandia Staff notes
12/1/11
• 2011 —Continenta Variance Application, Supplementai Information: Sewer System
Issues, Findings and Recommendations, City of Scandia Staff Report 12/8/11
• 2011 —City Council Agenda Report, 12/13/11
. Undated—annotated parcel map identifying properties served by Anderson/Erickson
System provided by City staff
. Undated—spread sheet listing parcels served by Anderson/Erickson System provided
by City staff
• 2012—Wastewater Treatment and Dispersal Operating Permit, OP 0400-1,Washington
Counry Department of Public Health and Environment
. 2012—Web Soil Survey of Washington County Minnesota - accessed 1/9/12
(http://websoilsurvey.nres.usda.gov/app/WebSoilSurvey.aspx)
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DRAINFIELD EXISTING CONDITION AND CAPACITY ASSESSMENT
Anderson/Erickson System —Scandia, MN
2.0 COLLECTION AND TREATMENT SYSTEM REVIEW
2.1 EXISTING COLLECTION SYSTEM
The original sanitary sewer collection system was intended to provide service for twenty-one
homes. The system includes individual septic tanks at each home and approximately 3,390
lineal feet of sewer main to collect the effluent from the individual septic tanks. Initially four tanks
were connected to the collector sewer thrnugh a 4 inch gravity connection with the remainder
connected to a 1'/z to 3 inch pressure sewer main through septic tank effluent pumping (STEP)
systems.
Septic tank effluent is directed to a main lift station located at the south end of Norell Avenue
from which it is pumped about 40 feet uphill to a large drainfield located about 500 feet east of
the shore of Big Marine Lake. The lifit station was equipped with dual-alternating 5 hp pumps
designed to deliver 50 gallons per minute at a total head pressure of 70 feet. Design dose
volume was about 529 gallons.
The pressure sewer collection system was extended by 3,700 feet in 2001 during a road
reconstruction project increasing the potential number of service connections to more than forty
five. Five additional connections were made immediately in 2001 and four more properties have
been connected since that time bringing the total number of connected properties to 30. It
appears that there are about ten (10) service connections that were stubbed out in 2001 but are
currently not in use. A Project Area Map (two sheets) illustrating the properties currently and
potentially served by the existing collection system is attached.
2.2 EXISITING TREATMENT SYSTEM
Initial treatment consisting of solids separation and anaerobic breakdown is provided by the
septic tank installed at each dwelling. Final treatment of septic tank effluent is soil-based and
occurs in a drainfield. The original drainfield system that was installed in 1987 is still in use.
Wastewater is delivered to the drainfield drop boxes by the main lift station and t�enches are
sequentially loaded by gravity (i.e. serial distribution). The system is divided into three
separate cells each consisting of 2,250 lineal feet of one-foot wide trench with 18 inches of rock
beneath the distribution pipe. The design anticipated that only two cells would be in operation at
any time with the third cell "resting°. Each lineal foot of trench was assumed to provide four
square feet of absorption area (one foot for the bottom and a total of three feet for the two 18-
inch side walls). Based on a design flow of 6,700 gallons per day, a soil loading rate of 0.37
gallons per day was anticipated while using two drainfield cells simultaneously.
The automatic valve system intended to create the alternating use and resting pattern amongst
the three drainfield cells apparently failed early in the system's life (reportedty due to water
infiltration in the valve manhole). Since this equipment failure, the system has been manually
advanced from one zone to the next on a yearly basis. Currently each zone is used for one year
then allowed to rest for two years. Although this essentially doubles the soil loading rate (one
cell is used instead of two), it appears that the system continues to function hydraulically and
neither surfacing nor excessive ponding in the drainfield trenches has been reported.
193802153 3
March 9,2012
StdI1�C
DRAINFIELD EXISTING CONDITION AND CAPACITY ASSESSMENT
Anderson/Erickson System—Scandia, MN
2.3 CURRENT FLOW INFORMATION
The wastewater flow to the drainfield system is measured at the main lift station. Flow rates are
calculated by multiplying the pumping rate by the number of hours that the pumps are actually
running. It appears that pumping capacity is verified yearly by manually operating the pumps
and measuring the time required to pump a known volume from the lift station. Running hours
for each pump, and for those times when heavy use causes both pumps to run simultaneously,
are recorded by"run time meters" (RTM) located in the pump station control panel. The RTMs
are read by Washington County staff about once a month. It appears that the RTM for one of
the pumps failed in June of 2008, and since then, time shown on the operating RTM is doubled
and added to the RTM recording simultaneous pump operation time (if any)to determine flow
for the monitoring period.
Monthly flows for the period 1990 through 1995 were included in TKDA's 2000 capacity report,
and a spread sheet calculating flows for the period June 2004 through October 2011 was
provided by Washington County. No data was available for the period February 1996 to June
2004.
The data indicates some seasonality in the use pattern, but generally a steadily increasing flow
with time. For the twelve month period ending October 2011, the average daily flow was 5,582
gallons. However, the average daily flow for the period July 5 to July 19, 2011 was 7,524
gallons and flows during the heavy summer use period (June/July) have consistently been in the
range of 7,000 to 8,000 gallon per day since the summer of 2006. Since these peak summer
flows are actually averages calculated over monitoring periods of 14 to 32 days, the true peak
daily flow is unknown but is clearly above these averages.
2.4 OPERATIONAL RECOMMENDATIONS
Currently the system is operating using one cell and resting two on a yearly basis. Resting each
drainfield cell for two years between uses is a good practice to prolong the life of the system, but
using only one of the three cells at any given time presents some concerns with respect to
hydraulic loading and the ability of the system to provide treatment. As currently operated, the
system is being loaded at three times the design rate during heavy use periods and at two times
the design rate on average. Although a copy of the original design report was not available fior
review, it appears unlikely that the system can provide adequate nutrient and pathogen
reduction when operated at these loading rates. Restoring the zoning functionality included in
the original design would mitigate this concern to some extent, but the system would still be
overloaded during the heavy use periods.
One of the pump RTMs has not worked since 2008. However, it appears that the lack of data
recording for this pump has been adequately addressed by periodically verifying that the
capacity of both pumps is similar, and multiplying the time recorded by the functioning RTM by
two. Replacing the broken RTM would be fairly inexpensive; however, as an alternative, the City
may wish to consider upgrading to a programmab�e logic controller (PLC) with supervisory
control and data acquisition (SCADA). Upgrading the control panel to a SCADA system or
something less expensive that would at least provide data recording capability would provide
much better flow data without the need for frequent visits to the site.
193802153
March 9,2012 4
S�ntCC
DRAINFIELD EXISTING CONDITION AND CAPACITY ASSESSMENT
Anderson/Erickson System—Scandia, MN
The 2000 TKDA �eport noted a par#icularly high flow to the system in June of 1993 and
correlates this spike in flow with abnormally high precipitation that month. The increased wet
weather flow was attributed to infiltration and inflow{I&I) of surface and/or groundwater to the
system.We did not compare precipitation data to flow data and can offer no opinion as to the
extent of l&I. Nevertheless, with so little gravity collection pipe, the primary concern would
appear to be sump pumps discharging to the system.With no way to measure the flow from any
given properiy, these types of connections would be difficult to detect and the City may have to
rely on education of the users to help eliminate these illicit discharges.
A more assertive effort could be completed by the City that would involve a sump pump
inspection program. This program would identify if any cross connections are present.A cross
connection is when a sump pump is connected to a sanitary sewer line instead of discharging
outside the house. If cross connections are identified and the City enforces corrective matters,
I/I to the overall system could potentially be reduced. The City first would want to have an
ordinance in place that would assist in the inspection ofi private property. Sump pump
inspections could be completed with existing Public Works staff or the �esidents could also have
the option to have a MN licensed plumber complete the inspection. Sump pump inspections
typically take about 15 minutes for each home.
193802153 5
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S�n�ec
DRAINFIELD EXISTING CONDITION AND CAPACITY ASSESSMENT
Anderson/Erickson System —Scandia, MN
3.0 CAPACITY EXPANSION RECOMMENDATIONS
3.1 EXPANSION WITHIN EXISTING DRAINFEILD AREA
Three hand-auger soil borings were completed within the unused portion of the drainfield
area owned by the City. Soil boring logs and a soil boring location map are attached in
Appendix B.
The borings indicate silt loam and loamy fine sand at the surface, which is underlain by
sandy clay loam and sand. Indications of periodic saturation were encountered at depths of
25 to 48 inches. Without pretreatment, three feet of vertical separation is required between
the bottom of the distribution media and periodically saturated soil, therefore any additional
soil treatment area constructed in this area would need to be elevated {i.e. a mound). While
any expansion of the existing system to provide additional capacity would be subject to the
approval of the permitting entity, treatment for an additional 2,000 to 2,500 gallons per day
should be achievable based on the soils observed and exten# of this residual area.
If the system "design" capacity remains below 10,000 gallons per day, Washington County
would continue to administer it as a Mid-sized Sewage Treatment System (MSTS). When
the system was originally designed in 1986, it was intended to treat 6,700 gallons per day.
This flow rate Lnrould be generously high applying today's design standards to the soils
present at the site. Nevertheless, the County would not question the original design o#the
system when permitting a potential capacity expansion. Repairing the broken dosing
functionality and adding a mound designed to treat an additional 2,000 or 2,500 gallons per
day would bring the total system "design"flow to 8,700 or 9,200 gallons per day, leaving it
within the permitting authority of the County. Nevertheless, with peak daily flows rates
unknown and average daily flow rates already 7,000 to 8,000 gallons during the heavy
summer use months, most of the additional "design" capacity added to the system through
these repairs and modifications would be taken up by the existing flow leaving very little true
capacity expansion. The County would also require a nitrogen assessment to determine if
the discharge from the system will impact an aquifer. A desktop review of published data
(Appendix A) suggests the area is "sensitive"to aquifer impacts, therefore a nitrate reduction
Best Management Practice (BMP) or pretreatment to reduce the nitrate concentration will
likely be required (subject to the County's requirements).
If the system were to be modified to exceed a design capacity of the 70,000 per day, it
would be regulated as a Large Subsurface Sewage Treatment System (LSTS) and a SDS
Permit would be required from the MPCA. The MPCA would appiy its LSTS Groundwater
Nitrate Nitrogen Policy which would require that a total nitrate concentration of i 0 mg/L (or
lower) be maintained at the downgradient property boundary, or that the effluent be
pretreated to reduce the nitrate concentration to less than 10 mg/L before it is discharged to
the soil. In the case of the former, the City already has monitoring wells that might be useful
in demonstrating compliance (assuming they are positioned correctly). In the case of the
latter, the additional mound would probably not be necessary since the highly treated
effluent could be loaded to the existing drainfield at a much higher rate (refer to Section 3.2).
193602153 6
March 9,2012
StanteC
DRAINFIELD EXISTING CONDITION AND CAPACITY ASSESSMENT
AndersoNErickson System —Scandia, MN
If a mound were to be built on the residual area, effluent would have to be distributed to it
under pressure (whether it is permitted by the County or State). This would likely require a
dosing tank in the drainfield area. Assuming the system is going to be permitted by the
County (the least expensive option}, we would estimate $20,000 for a 10,000 gallon dosing
tank installed; about$14,000 for dual dosing pumps, a simple control panel and wiring; and
about $40,000 to construct the mound. Based on our discussions with the County, it appears
that they would allow the existing drainfield to be dosed by gravity; therefore minimal
modification to the drainfield itself would be required. However the dosing functionality
originally provide by the broken valve system at the drainfield site would have to be
replicated in the dosing tank and we would estimate a cost of about$5,000 to purchase and
install this equipment. The dosing and resting cycle could be considered a Nitrogen BMP
(subject to the County's approval) and would be built in with no additional cost. With 30% for
design, permitting and contingencies, adding a mound to the exis#ing system could easily
cost more than $100,000 and would add no more than about 1,200 gallons in daily capacity.
3.2 PRETREATMENT OPTIONS
There are a number of potential pretreatment options available that would allow increased
flow to the existing drainfield cells. Public domain technologies including single-pass and
re-circulating media filters were contemplated by Bonestroo in their 2002 report and remain
potential options for the City. The cost of these technologies has increased somewhat since
2002 due to labor and materials costs and regulatory requirements.
There are also a number of proprietary treatment products available that are registered for
use in Minnesota. These systems vary widely in initial capital costs and in the ongoing cost
of operation and maintenance, but in general they employ an air blower to oxygenate
effluent and encourage the colonization of aerobic bacteria on a membrane or in
suspension. For the purposes of estimating costs, we assume full build-out along the
collection system providing service to 45 4-bedroom houses with a total daily flow of about
15,500 gallons. This large a system would be permitted by the State.
If the effluent were to be pretreated, it would need to be distributed throughout the drainfield
by pressure. The existing gravity distribution system utili2es 4 inch perforated pipe and it
should be possible to slide smaller pressure distribution pipe into the 4 inch pipe. Additional
tanks and pumps would also be required at the treatment site.
As noted above, the total cost adding pretreatment varies widely with the technology.
Something in the range of$200,000 to $400,000 would be required for tanks, pumps,
controls, and treatment equipment, but if nitrogen reduction to 10 mg/L is required, the
equipment costs could double. Another$100,000 should be budgeted for drainfield
modification, design and contingencies. The advantage of pre-treating the effluent and
utilizing the existing drainfield is that most of the dispersal and groundwater monitoring
infrastructure is already there, and there is no land acquisition cost. We believe this option is
likely to produce the lowest overall cost to increase the capacity of the system to serve all of
the properties along the existing collector pipe. A much more accurate estimate of the actual
cost of this type of system modification can be provided if the City chooses to pursue this
option.
193802153 7
March 9,207 2
Stantsc
DRAINFIELD EXISTING CONDITION AND CAPACITY ASSESSMENT
AndersoNErickson System —Scandia, MN
3.3 ACQUISITION OF ADDITIONAL LAND
Based on our own investigation and the review of available information, it appears that any
soil treatment and dispersal system built on land adjacent to the existing system would have
to elevated (i.e. a mound). It appears the City had some adjacent property evaluated in
2001, contemplated purchasing the property, and then decided to discontinue negotiations
with the owner. Nevertheless, expansion onto adjacent property remains an option.
A desktop review of suitability of the soils within reasonable reach of the existing system is
included in Appendix A. It appears the best soils are north and east (across Olinda Trail) of
the existing system. To provide for full build out of existing collection system, we estimate
treatment for about 15,500 gallons per day would be required and the system would be
permitted by the State. The State may allow the continusd use of the existing drainfield if it
can be demonstrated that it is adequately treating wastewater. For the purposes of
discussion, we have that it is not and that the entire system would need to be replaced on
nearby property.
Typically the State will require that the City provide enough land for a replacement site, and
they will want to see 150% of the required treatment system built out immediately with 50%
of the land held in reserve. Assuming a conventional mound loaded at 10 gallons per lineal
foot per day, about 3'h acres of treatment area would be required {including the reserve
area). Depending on the system geometry, mound spacing, and the slope of the land, at
total of about 5 to 7 acres of land would be required to construct a replacement system. We
estimate the land cost to be approximately$10,000 to $15,000 an acre; and the cost of the
mounds, tanks, pumps, controls and electrical to about$370,000 including 30%for design
and contingencies. In total, a replacement system on land to be acquired would probably
cost about$500,000 without pre treatmant to reduce nitrogen. To reduce nitrogen to less
than 10 mg/L, another$250,000 in treatment equipment might be required. Without a
nitrogen reduction pre-treatment, it would likely be necessary to expand or replace the
existing monitoring well network.
193802153 g
March 9,20�2
�n�
DRAINFtELD EXISTING CONDITION AND CAPACITY ASSESSMENT
Anderson/Erickson System —Scandia, MN
4.0 FINANCIAL CONSIDERATIONS
4.1 MAINTENACE OF EXISTING SYSTEM
No information on the City's current expenditures to maintain #he system was provided for
review. We understand the costs to maintain the AndersonlErickson System are combined
with the Bliss System and record keeping does not allow the maintenance costs to be easily
separated between the two systems.
If the system is not expanded, it will operate under a permit issued by the County. Therefore
County staffi will no longer be able to operate the system for the City and the City will need to
hire a contractor. We understand all of the septic takes associated with system were
pumped in 2011 creating a spike in maintenance costs. It is required that tanks be cleaned,
or checked to determine if they need cleaning every three years. Staggering the
maintenance so that one third of the tanks get pumped every year would smooth out the
cost of this maintenance. Transitioning to this schedule might require delaying the pumping
of some tanks (#or example some seasonal users) or accelerating the pumping schedule for
some other tanks until the properties can be broken out in three groups.
We recommend that the City consider using the existing monitoring well and piezometer
network for the purposes they were originally installed. Measuring ponding in the trenches,
the groundwater mound beneath the system, and the impact (if any) tha#the system is
having on groundwater quality is useful data. This information would validate the
performance of the system, help the City to operate the system more efficiently, and identify
potential deficisncies.
4.2 SYSTEM REPAIR
If nothing else is going to be done to the system we recommend replacing the RTM at the lift
station and repairing the automatic dosing valves in the valve box at the treatment site so
the system will operate as designed. We understand that is also an electrically operated
drain back valve at the main lift station that is inoperative. Replacing this valve would reduce
the run time of the pumps. The RTM is probably no more than a few hundred dollars
installed, but the valve equipment and wiring could easily be several thousand. We would
have to review the original design documents, determine if comparable replacement
equipment is available, and test the existing wiring to come up with an accurate repair
estimate.
Instead of replacing the RTM, the City should consider upgrading the control panel at the
main lift station. Regardless of whether the treatment system is replace, upgraded, or
operated as is, upgrading the control panel would provide much better data acquisition
without making frequent visits to the site. We would estimate an upgraded panel at the lift
station be about$12,000 installed, which would include telemetry features. Without the
telemetry features the cost would roughly be half. We understand the City is currently
replacing the pumps and controls for their"Downtown"system, and panel costs included in
those bids should be comparable.
193802153 9
March 9,2012
$tanf�t
DRAINFIELD EXISTING CONDITION AND CAPACITY ASSESSMENT
Anderson/Erickson System—Scandia, MN
4.3 SYSTEM EXPANSION
With flows during the summer months aiready averaging 7,500 to 8,000 gallons per day over
14 to 30 day periods, it seems likely that the peak daily flow is already over 10,000 gallons
per day. In our opinion, designing any upgrade for a flow less than 10,000 gallons per day
would be short sighted and would be unlikely to pass regulatory scrutiny. As previously
noted, expanding the system to provide additional capacity at or above 10,000 gallons per
day would require a SDS Permit, and the permi#fee is nearly$10,000. The costs to
construct, operate, and maintain an upgraded system would depend not only on the
technology used to achieve the increased capacity, but also on the permit conditions and
fees imposed by the State. It is difficult to estimate those costs at this time, but annual O&M
costs could easily exceed $10,000 with monthly reporting and groundwater monitoring.
The approximate costs of expanding the system the serve all of the properties along the
collection has been presented in the sections above. A feasibility study would more
accurately predict these costs for the City's consideration. At this time there are too many
variables for use to accurately predict the total cost of a capacity upgrade, but it certainty
appears that pre-treating effluent and utilizing the existing drainfield for disposal would
produce the best value. O&M costs would depend on which technology is employed and the
operating permit conditions.
193802153 1p
March 9,2012
��
DRAINFIELD EXlSTING CONDITION AND CAPACITY ASSESSMENT
Anderson/Erickson System —Scandia, MN
5.0 DISCUSSION AND CONCLUSIONS
The Anderson/Erickson coliection system has been expanded to provide potential service
connections to about 15 additional properties; however the treatment system has no capacity to
accept the proposed flows. Arguably the system is already being overloaded and there are
numerous seasonal properties already connected to the system that could convert to year round
use and further overload the system. Given the current conditions,we recommend no additional
connections to the system at this time.
The system was designed in 1986 in accordance with the standards applied at the time.
Currently, Minnesota Rules Chapter 7080 and 7081 provide prescriptive standards for sewage
treatment. Systems built in accordance with these standards are presumed to provide adequate
sewage treatment. Systems built and/or operated outside of these guidelines are typically
required to demonstrate that they provide and acceptable level of sewage treatment. Applying
today's prescriptive treatment standards to the system, each of the three drainfield cells would
be assumed to provide treatment for 1507 to 1809 gallons of wastewater per day, depending on
whether it was bedded in silt loam or loamy fine sand. If the entire drainfield system were to be
used simultaneously, it would be presumed to provide treatment for 4521 to 5427 gallons per
day. Of course these prescriptive#reatment standards alsv assume that there is also at least
two feet of unsaturated soil beneath the system at all times. Given an average loading rate of
5600 gallons per day to one cell over the past year, soil saturation seems likely and treatment is
in question. Monitoring wells are already present at the site, and depending on whether they
were installed in meaningful locations, it might be possible to demonstrate that the system is
currently treating sewage by demonstrating that it is not impacting groundwater. Conversely,
sampling the wells may demonstrate that the system is negatively impacting groundwater
quality thus precipitating a need for additional action.
Based on our review of the information provided, it appears that the City has been
contemplating the capacity of the system and possible upgrades to the system for many years.
It appears that no action has been taken primarily due to financial considerations. If the goal of
the City is to allow additional connections to the system and eventually reduce the number of
private individual systems, financing for the improvements needs to be addressed and pursued
as soon as possible to provide a plan for future demands of the residents identified within the
potential service area of the system.
We understand users are charged approximately$55 per month and the current hook up fee is
currently$4,250. Going forward, the City may want to consider the actual value of the system
to the users. For example, if someone were to build a mound system on their property to serve
a 5 bedroom house, it would be more than 100 feet long, more than 45 feet wide, and cost more
than $20,000 to construct. Even if that much room were available on a lot, the presence of such
a dramatic landscape feature would be objectionable to most people.Therefore it seems
reasonable that both new and current users pay for the actual value of the system. If the hook
up and service fee are adjusted additional revenue can be generated to provide better
maintenance of the system and eventually provide financing to replace the system.
193602153 11
March 9,2012
Stan�c
DRAINFIELD EXISTING CONDITION AND CAPACITY ASSESSMENT
Anderson/Erickson System—Scandia, MN
Not being able to predict the rate of future new connections or not having the time for additional
funds to accumulate by a increase in the monthly service fee the City may want to look at
alternative financing options to have improvements completed before future connection
requests are made.
Alternative financing options couid be provided through the General Tax Levy or Special
Assessments. Minnesota cities are required by law to hold a yearly public hearing to receive
comments on the types of services proposed for the upcoming year, as well as the associated
costs. These public hearings are referred to as Truth-in-Taxation hearings. The proposed
budget and proposed property tax levy and their percentage increases from the current year
(evels are typically discussed at the hearing. The Anderson/Erickson System would therefore be
addressed as part of the budget preparation process. The main advantage of using funds from
the general fund is#hat justification of direct benefit of a particular project to a property is not
required. A major disadvantage is that priorities can change rapidly and dedicated funding may
prove difficult to rely on from year to year, or even be inadequate. Special assessments are an
indirect form of taxation. They are a way for cities to charge certain properties for the cost of
making a local improvement, or to collect certain charges that will benefit those properties.
Cities may use special assessments to recover the cost of public improvements if the city has
adopted an ordinance to provide for it. The amount that is charged to a particular property must
be based upon the benefit that the property will receive from the improvement. Cities cannot
charge an amount greater than the amount the benefit will increase the value of the property.
There are many advantages to using special assessments as a funding source. They are a
means of raising money outside the general city tax resources. Special assessment bonds do
not count towards statutory debt limitations. They pravide a means of levying charges for public
services against properties otherwise exempt from taxation. Perhaps the chief value of special
assessments is that by charging the property owner for the benefit received, they prevent or
minimize the possibility that a property owner will benefit from the improvement at the expense
of the general taxpayer.
193802153 12
March 9,2012
�� ��
�.�� (�,
` < _
Memo
�� To: Ryan Goodman From: Clint Jordahl
Stantec, St. Paul MN Stantec, St. Cloud, MN
File: 193802153 Date: March 12, 2012
Reference: Anderson/Erickson Wastewater System Options — City of Scandia
Do Nothing—Continue to operate the system under the under the County's permit (OP
0400-1). According to the permit, both peak flow (8,600 gpd) and average flow
(5,300 gpd monthly average) are targets not limits. However, there is currently no
way to determine peak daily flow without reading the meters daily. Replace RTM at
main lift station by 1/1/2013, and "investigate" repair of dosing valves by 1/1/2014.
2012 costs are for RTM installed (<$500).
Add a Small Mound to Existing Property— Mound adds 2,000 to 2,500�gpd in
design capacity, half of which is consumed by existing peak flows of 8,000 gpd.
(6,700 + 2,500 = 9,200 gpd design flow; 9,200 - 8,000 gpd of existing flow equals
t1,200 gpd increased capacity). Cost estimate if permitted by Washington County
and nitrate reduction is not required $102,700.
Add Pretreatment and Utilize Existing Drainfield — Purchase and install equipment to
pre-treat about 15,500 gallons per day, which would accommodate about 45 year-
round connections. State of Minnesota would permit system and would have the final
say on all design matters. Equipment and O&M cost vary widely. Drainfield
modifications required to distribute treated effluent under pressure. Estimated total
cost $300,000 to $500,000 without nitrogen reduction. If end of pipe requirement is
<10 mg/L nitrate, add approximately$200,000 in additional equipment.
Acquire Additional Land to Expand or Replace System —Assuming a system large
enough to accommodate service area, State Permit will be required. The State is
unlikely to allow continued use of existing drainfield without pretreatment (refer to
pretreatment costs above). Total system replacement is assumed with a build out
design flow of about 15,500 gallons per day. Cost of new system with land, about
$500,000, plus about$30,000 to replace/upgrading the monitoring well network. If
nitrogen pretreatment is required by the permitting authority, add about$250,000 in
equipment costs and subtract the monitoring well cost.
One Team.Infinite Solutions.
�� �
Memo
��� To: Ryan Goodman From: Clint Jordahl
Stantec, St. Paul MN Stantec, St. Cloud, MN
File: 193802153 Date: April 12, 2012
Reference: Anderson/Erickson Wastewater System— City of Scandia
Ryan,
Attached you will find the analytical results for the samples collected from the four deep
groundwater monitoring wells surrounding the Anderson/Erickson drainfield. The wells
were samples on March 22, 2012 using the dedicated balder pumps installed in the
1980s when the system was new. Samples collected from the wells were analyzed for
Chlorides, nitrite plus nitrate (NO2 + NO3), Total Kjeldahl Nitrogen (TKN), and ammonia
nitrogen. These four parameters are typical of those required for groundwater
monitoring systems at drainfields operated under permits issued by the State of
Minnesota.
Chloride is a general water quality parameter and its presence can be used track
impacts to shallow aquifers from wastewater systems. Chloride concentrations ranged
from 7.7 mg/L in Well C to 493 mg/L in Well B. There is no enforceable drinking water
limit for Chloride, but there is a secondary limit (aesthetic limit)of 250 mglL. This
secondary limit for Chloride was exceeded in three of the four wells sampled.
The three nitrogen species(TKN, ammonia and NO2+ NO3) are collectively of concem
in drinking water due to their ability to be metabolized into nitrite, and nitrite's potential
to negatively impact the health of infants. The Minnesota Department of Health has
established a Health Risk Limit (HRL) of 10 mg/L for nitrate as nitrogen in drinking
water. The Environmental Protection Agency (EPA) has established a Maximum
Concentration Limit (MCL)of 1 mg/L nitrite as nitrogen in public water supplies.
Neither TKN nor ammonia was present in any of the water samples tested; however,
NO2 + NO3 was present in concentrations ranging from 1.4 mg/L in monitoring Well C to
19.6 mg/L in Well B. The nitrogen concentration was in excess of the HRL in three of
four wells sampled.
The water table beneath the site is about 50 feet below the surFace or roughly the
elevation of Big Marine Lake. Because the water level in two of the wells was below the
top of the pumps, accurate groundwater elevations could not be measured. Therefore,
the direction of groundwater flow could not be determined based on direct
measurement during the March 2012 sampling event. Nevertheless, MPCA
One Team.lnfinite Solutions.
jc c:\users\cJordahl\documents\bonestoo�20111scandie\well sampling memo.docz
Star�tec
April 11,2012
Ryan Goodman
Page 2 of 2
Reference: AndersonlErickson System
correspondence from the early 1990s suggests that the groundwater flow direction
beneath the site is northwesterly.
Based on the sampling results, it appears that the system has impacted groundwater
quality. Well C, which is located in a presumptively upgradient position with respect to
the drainfield is likely to best represent the quality of the groundwater flowing to the site.
Both the Chloride and nitrogen concentrations in the water sample collected from this
well were fairly low. In contrast, Chloride and nitrogen concentrations in each of the
other wells were much higher. Wells A and B are located so close the actual drainfield
area that they appear to be impacted by wastewater trickling through the soil and
diffusing at the water table. According to MPCA correspondence, Well D is not located
directly downgradient of the system, but "is probably located just far enough within the
plume edge to be useful as an indicator of downgradient water quality".
At this point I would recommend that the wells be resampled to see if the results are
repeatable. I might suggest waiting until after the heavy use period surrounding the 4cn
of July to sample the wells. It may also be interesting to install a truly downgradient well
at the drainfield property boundary to determine if groundwater impacted above drinking
water standards is traveling off site.
If the condition persists, it may be necessary to alter the configuration and/or use of the
drainfield system to address the high nitrogen concentrations in the groundwater.
Sincerely,
Stantec Consulting Services
Clinton . Jord I, PG
Senior G i
clint.jordahl@stantec.com
Attachment: Laboratory Analytical Report
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� � � DRAINFIEl.D TREATMENT SYSTEM PLAN . ' �
� FIGURE� 3-6
' � � �
V�k�aF��Nt�TO� COUNTY
1�endor Copy Contracti #.�( D I
�� Dept. ��"L� _
�p�, Div. _
Community Wastewater Treatment ��
Operation and Maintenance Agreement
This Agreement is made and entered into by and beiween Washington County, hereinaf�er
referred to as the"County"and the City of Scandia,hereinafter referred to as the"City".
Whereas, under the Washington County "201" Sewer Use Ordinance, the incorporated
community (the City) in which the treatment system is situated is responsible for operation,
maintenance and replacement of a11 publicly owned components of the community sewage
treatment system; and
Whereas, the City desires to contract with the County for the performance of routine opera.tion
and maintenance of the community wastewater treatment system (hereinafter referred to as the
"201 system") owned by and under the jurisdiction of the CiTy; and
Whereas, the County agrees to render such operation and maintenance services on the terms and
conditions hereinafter set forth; and
Whereas, such Agreements are authorized and provided by Minnesota Statute 471.59;
Now Therefore, in consideration of the mutual promises contained herein, it is mutually agreed
between the County and the City as follows:
Section i. County's Responsibilities
1. The County agrees to provide,through its Department of Public Health and Environment,
201 system operation and maintenance for Bliss and Anderson/Erickson systems within
the corporate lirnits of the City to the extent and in the manner set forth in this section.
2. The County will provide routine operation and maintenance of the existing 201
wastewater treatment system in accordance with the approved Operating and
Maintena.nce Manual for the system and as anticipated and planned for in the annual
operating budget as adopted by the City Council. Routine operation and maintenance as
provided in this contract specifically excludes decisions or actions regarding 201 system
upgrade, expansion of use and/or replacement of the system.
The most recent agreed upon version of the Operating and Maintenance Manual for the
system is incorporated herein by reference. Further,the parties by mutual agreement may
modify or update said manual with the new version then being automatically incorporated
herein without the need to otherwise amend this agreement.
3. In providing such routine operation and maintenance, the County will provide staff,
equipment and other supplies and materials as may be needed to conduct such routine
operation and maintenance. The standards of perFormance,method of providing services
and other rnatters incident to the performance of operation and maintenance services
1
_ ,
under this Agreement, including personnel to be employed, shall be determined by the
County except to the extent that specific operating policies and procedures have been
adopted for the 201 system.
4. The County can expressly subcontract pumping services and/or routine maintenance and
repair to the 201 system (such as excavating services, pump or tank repair, repair to lift
stations and collection lines) as necessary to fulfill its obligations under this Agreement.
As part of an agreement with any subcontractor under this paragraph, the County will
require vendors, at a minimum, to provide insurance coverage in an amount equal to the
county's liability limits set forth in Minn. Stat. Chapter 466 and the worker's
compensation requirements in Minn. Stat. Chapter 176. Vendors are to agree, as a
condition subsequent, to increase the required insurance coverage as the liability limits in
Minn. Stat. 466.04 increase. The county may set higher limits than those set forth in
Minn. Stat. Chapter 466 for contracts in which #he exposures/risks generated are
significantly higher.
In instances where a vendor can only provide lesser limits of coverage, the County may
accept these limits, realizing there is additional exposure to risk. There are also occasions
where the services provided by vendors expose the county to very little risk, and the
insurance requirement may be waived in part or entirely. However, in cases where lower
insurance limits are sought or a waiver of insurance requirements is requested, all such
requests shall be made in writing to the county's Risk Manager in Human Resources for
approval. Such a request shall be mad e prior to having the County Attorney's Office
sign the contract as to form. If liability insurance requirements are waived, a workers
compensation insurance requirement must still be in the contract.
5. The County will prepare an annual proposed budget for the 201 system operation and
maintenance and present such proposed budget to the City each yeaz, by November 30,
for the following year of operation.
6. Following the policies and procedures established by the City, the County will prepare
annual charges to be assessed to the residents on the 201 system. These charges, along
with the documentation by which the charges were determined, will be submitted to the
City Clerk on a time schedule determined by the City.
7. In the event that the 201 system requires maintenance and/or repair which will result in
expenditures beyond that which has been approved by the City in its annual budget, the
County will contact the City in advance of authorizing and/or proceeding with such
repairs. Emergency repairs will be managed in accordance with the operating policy
mutually developed between the County and the City.
8. The County will submit, on behalf of the City, all reports required by the MPCA under
the SDS pernut for the 201 system. The County will provide timely reports to the City on
individual maintenance, repair or emergency incidents. The Counry will also provide an
annual operating, maintenance and repair report to the City together with an assessment
of the overall status of the 201 wastewater treatment system. Such annual report shall be
, ,
made by February 1 of each year for the prior operating year.
9. The County will cooperate with the City's officials andlor employees (including
engineering staffl in fulfilling its obligations under this Agreement.
Section II. City's Responsibilities
1. The City, its officers, agents and employees, will cooperate and assist the County in the
performance of this Agreement.
2. The City will provide policy and procedural direction for the operation and maintenance
of the 201 wastewater treatment system and will communicate such policies and
procedures to the County through written notice to the County alorig with copies of said
policies and procedures as adopted andlor revised.
3. The City specifically authorizes the County to subcontract, on its behalf, for services to
be provided by the County under the provisions of this Agreement.
4. The Ciiy will be responsible for approving the budget for 201 system operation and
maintenance and for advising the County of its budget decision. The City, at its sole
discretion, will be responsible for determining the type of and/or amount of any
replacement fund for its 201 system.
5. The City will approve any maintenance andlor repairs to the 201 system which, in the
County's estunation, will exceed the budget established by the City. Such approval shall
be in advance of the County's proceeding with repair andlor maintenance except that
emergency repairs will be made in accordance with the operating policy mutually agreed
to between the County and the City.
6. The City will be responsible for determining, through its engineering firm or its own
consultants, the amount of available capacity for expanded use of the system.
7. The City will be responsible for making decisions regarding upgrade, expansion of use
and/or replacement of the 201 system. Such decisions include the issuance of building
permits and review of variances for new construction which would be connected to the
241 system and/or expansion of existing homes which are currently on the 201 system.
8. The City will approve annual billings to residents on the 201 system and will send such
bills to the zesidents on City letterhead. The Ciiy will be responsible for collection of all
annual billings to residents.
9. The City shall maintain and be responsible for its 201 system monetary fund.
10. The Parties agree that this agreement is strictly for the benefit of the City and no benefits
from this Agreement, third-party or otherwise, will inure to the individual residents of the
City.
3
Section III. Payment for Services
1. The City agrees to reimburse the County for its expenses related to the services provided
under this Agreement. Reimbursement for staff personnel time shall be $100.00 per
hour for the calendar year 2012; and $100.00 per hour for the calendar year 2013.
Mileage will be reimbursed at the current County reimbursement rate to its employees as
determined annually by the Washington County Boazd of Commissioners.
2. The City agrees that it shall bear the sole responsibility for the cost of any necessary
replacement motors, parts and related labor, subcontractor costs, and utilities necessary
for operation and maintenance of the 201 system and all expenses in excess of staff costs
and mileage expense.
3. Quarterly, the County shall submit its actual expenses to the City for reimbursement. The
request for payment shall be accompanied by an explanation of the charges. Charges
shall be submitted in April (for the period from January 1 to March 31), in July (for the
period from April 1 through June 30), in October (for the period from July 1 to
September 30) and in January (for the period from October 1 to December 31 of the
previous year).
4. The City shall pay the County's invoices within forty-five (45) days of receipt, except for
those individual invoice items where a legitimate question exists. In such cases, the City
will pay all unquestioned amounts in the time specified above, while the parties agree to
work in good faith to resolve any billings in question.
5. At the end or termination of this Agreement, the City will pay all reimbursable expenses
incurred by the County in performance of this Agreement up to and including the final
date of the effective date of the Agreement.
Section IV. Indemnity
Each party agrees that it will be responsible for its own acts and the results thereof to the extent
authorized by law and shall not be responsible for the acts of the other party and results thereof.
The County's liability shall be governed by Minnesota Statute section 466.04.
Under no circiunstances, however, shall a party be required to pay on behalf of itself and other
parties, any arnounts in excess of the limits on liability established in Minnesota Statutes,
Chapter 466, applicable to any one party. The limits of liability for some or all of the parties
may not be added together to determine the maximum amount of liability for any party.
Section V. Nondiscrimination
During the performance of this Agreement,the County agrees to the following:
No person shall, on the grounds of race, color,religion, age, sex,disability, marital status, public
assistance status, criminal record, creed or national origin be excluded from full employment
rights, participation in, be denied the benefits of or be otherwise subjected to discrimination
under any and all applicable Federal and State laws against discrimination.
Section VI. Records—Av�ilability and Retention
Pursuant to Minnesota Statute 16C.05, Subd 5., the County agrees that the City, County, the
State Auditor, or any of their duly authorized representatives at any time during normal business
hours and as often as they may reasonably deem necessary, shall have access to and the right to
examine, audit, excerpt, and transcribe any books, documents, papers, records, etc. which are
pertinent to the accounting practices and procedures of the County and involve transactions
relating to this agreement. The County agrees to maintain these records for a period of six years
from the date of termination of this Agreement
Section VII. Data Privacy
All data collected, created, received, maintained or disseminated for any purposes by the
activities of the County because of this Agreement is governed by the Minnesota Government
Data Practices Aci, Minnesota Chapter 13, as amended, the Minnesota Rules implementing such
Act now in force or as adopted, as weil as Federal Regulations on data privacy, including but not
limited to, the Health Insurance Portability and Accountability Act (HIPAA) where it applies.
The County agrees to abide by these statutes,rules and regulations and as they may be amended.
Section VIII. Firearms Prohibited
Unless specifically required by the terms of this Agreement,no provider of services pursuant to
this Agreement, including but not limited to employees, agents or subcontractors of the County
shall carry or possess a firearm on county premises or while acting on behalf of Washington
County or the City pursuant to the terms of this Agreement. Violation of this provision shall be
considered a substantial breach of the Agreement; and, addition to any other remedy available
under law or equity. Violation of this provision is grou.nds for immediate suspension or
termination of this Agreement.
Section IX. Term of the Agreement
1, T'his Agreement shall be effective on February 28, 2012. Unless sooner terminated as
provided herein, this Agreement shall terminate on Decem.ber 31, 2013. This Agreement
shall not be self-renewing; however, the Parties may renew this agreement beyond the
December 2013 expiration date, subject to agreement to extension of the agreement, in
writing,by each of the Parties.
2. Due to the changes to MN Rules 7080-7083 and County Ordinance#179,the County will
be issuing an operating permit for the Anderson/Erickson 201 System. The County will
phase out operation and mainteriance of the Anderson/Erickson 201 System. The City
will seek professional services necessary for operation and maintenance of the
Anderson/Erickson 201 System. Both parties agree that after a suitable vendor is
acquired the agreement to operate and maintain the Anderson/Erickson 201 System will
5
be terminated within 30 days of written notice by the City to the County that the City has
acquired a contractor for the Anderson/Erickson 201 System. This agreement will still
apply to the operation and maintenance of the Bliss 201 System unless the City
determines to terminate the entire agreement per item 4 below.
3. It is understood that this Agreement contains the entire Agreement between the County
and the City and that any statement, promises or inducements made by arxy Party hereto,
or officer, agent, or employee of either Party hereto,which is not contained in this written
Agreement shall not be valid and binding; and this Agreement may not be enlarged,
modified or altered except in writing signed by each of the parties hereto. It is expressly
understood between the Parties, and this understanding shall be considered in interpreting
the provisions of this Agreement, that upon notice given by any Party hereto, later
negotiations may be undertaken for the purpose of revising, adding to or striking any
provision of this Agreement which appear unworkable or insufficient to perfect,maintain
and insure the purpose of this Agreement. Any change of the original provisions of this
Agreement shail be written, signed by both parties and attached to this Agreement as
provided above and this later revision, addition or deletion shall only apply to the
provision revised, added or deleted and the remainder of this Agreement shall remain in
full force and effect.
4. This Agreement may be terminated at any time and with or without cause by either Party
by providing ninety(90) days written notice to the other Party of intent to tezminate.
Section X. Severability
Every section,provision or part of this Agreement is declared severable from every other section,
provision or part thereof to the extent that if any sections, provision or part of this Agreement
shall be held invalid by a court of competent jurisdiction, it sha11 not invalidate any other section,
provision or part thereof.
In Witness Whereof, the City has caused this Agreement to be signed by its Mayor and attested
to by its Clerk, and the County has caused this Agreement to be signed by the Chair of its Board
of County �Commissioners �and attested to by its County Administxator. For purposes of
administering this Agreement,the County contact shall be Amanda Strommer, Program Manager
or her designee; and the City contact shall be Anne Hurlburt,Administrator or her designee.
For the City of Scandia For the Co of Washington
.
ayor County Board Chair
a �ti a. o � �7' �z� / 2� � 2
Date Date
� �
City Clerk Coun dministrator
d,�..t_/'��Z 6/ �. �����li
Date Date
Approved as to Form
1��I� �
y
Assistant VJashington County Attorney
7
Department of Public
Health and Environment
Washington
^��0��� Lowetl Johnson
�••`,� WASTEWATER TREATMENT oirector
AND DISPERAL OPERATING PERMIT Sue Hedlund
Deputy Director
OPERATING PERMIT NO. OP 0400-2
SYSTEM NAME: Scandia Uptown
�`�� �
PERMITTEE NAME: City of Scandia �
�` �� �"
�
ADDRESS: 14727 209th St N ° � ~ �° �...� �`� ��� � �: �
Scandia, MN 55073 � �_ -:, ,�
�� �i �'��
,
PHONE: 651-433-2274
PROPERTY ID. NUMBER (GIS LOCATION): 23-032-20-22-0006
SERVICE PROVIDER:C&BSERVICE PROVIDER PHONE: 433-3986
Washington County authorizes the Permittee to operate a Subsurface Sewage
Treatment System in accordance with the requirements of this operating permit. The
attached Management Plan is hereby incorporated as part of the requirements of this
operating permit
ISSUANCE DATE: 1/1/2012 EXPIRATION DATE: 12/31/2012
.��:.
_ ��� ,�
SYSTEM TYPE: Type I TREATMENT LEVEL: C �� ��"; ��
.: ���, ��"�� ����,
� ,�� _
SYSTEM DESIGN FLOW: 7535 : � �� ������� �-Y��-
, . ��,��
RESIDENTIAL/COMMERCIAL: Commercial ��� �'
�,4
� � � � � � �,P .
SYSTEM COMPONENTS: Septic Tanks and Gravity Drainfield � � `~
����
,. x.
• Tank 1: 1500
• Tank 2: 1500 ��>
• Pre-Treatment Device: None � � �}g ��
.
Pump Tank: 1500 � �� �t �-� �
• Soil Treatment Area: 6750
Government Center • 14949 62nd Street North— P.O. Box 6, Stillwater, Minnesota 55082-0006
Phone: 651-430-6655 • Fax: 651-430-6730 • TTY: 651-430-6246
Service Cenfers also located in Cottage Grove and Forest Lake
www.co.washinqton.mn.us
Equal Employment Opportunity/Affirmative Action
REPORTED MONITORING REQUIREMENTS
PARAMETER TARGET LIMITS FREQUENCY LOCATION
Peak Flow(GPD 7535 Dail Dosing Lift Station
Avera e Flow(GPD 2026 Monthly Dosing Lift Station
cBo�s m /L 125 Quarterly Drop Box#1
Tss m /L 60 Quarterly Dro Box#1
O&G m i� 25 Quarterl Dro Box#1
Totat Nitro en(m /� 20 Quarterly Dro Box#1
Field Tests:Temperature, pH, D.O.
No SurFace Discharge, Ponding to
Pondin /Surfacin in Soil Treatment Area Dro Box 5 Quarterly Drainfield
MONITORING PROTOCOL
Any sampling and laboratory testing procedures shall be performed in accordance with the proprietary treatment producYs protocol,
Standard Methods, and at a Minnesota Department of Health approved laboratory. Results shall be submitted to the Washington
County Department of Public Health& Environment within 20 days of sampling. Samples must be representative of the flow.
Wastewater samples are expected to be taken during average to peak flow events to the greatest extent practical
MAINTENANCE REQUIREMENTS
SYSTEM COMPONENT MAINTENANCE FREQUENCY
Se tic Tanks Pumpin /Cleanin Bi Annual or as Needed
Pump Tank and Controls Inspect for dama e,function, pump current draw Amps Monthl
Inspect for damage, function. Mowing as needed, Gopher
Soil Treatment and Dispersal Control Monthl
CONTINGENCY PLAN
In the event the wastewater treatment system does not meet required performance requirements as contained in this operating permit,
the Permittee shall notify the Department within 30 days of non-compliance.
AUTHORIZATION
This permit is effective on the issuance date identified above.This permit and the authorization to treat and disperse wastewater shall
expire in one year.The Permittee is not authorized to discharge after the above date of expiration.The Permittee shall submit
monitoring information and forms as required by the Washington County Department of Public Health& Environment no later than sixty
(60)days prior to the above date of expiration for operating permit renewal.This permit is not transferable to person or place.
The Permittee is required to obtain the services of a Minnesota Pollution Control Agency(MPCA)licensed 1)Service Provider to
perform ongoing system operation, maintenance, and monitoring and 2) Maintainer to pump the system's sewage tanks and
components. Submit a copy of the signed contract between the Permittee and the licensed Service Provider. If the Permittee fails to
comply with the provisions of this operation permit,the Permittee understands that penalties may be issued. If the Permittee sells this
property during the life of the permit,the Permittee will inform the new owner(s)of the permit requirements and the need to renew the
operating permit.
Any extension or new connections to the collection system must be approved by the permitting authority based on collection system
and soil treatment area capacity.
Page Z of 4
Additional Conditions;
Reporting to the County shall be quarterly but flow readings should be recorded at least monthly or
more frequently as determined by the operator. A method of recording actual daily (not average) flow
is desirable.
Pumps shall be calibrated annually or immediately after alteration of piping or any noted change in
pump or panel function.
Report ponding as active trenches, drop boxes 1 to 9.
Before 1/1/2013
Complete all recommended repairs and additions shown on table 7.1 of the Uptown System Master
Plan exclusive of the equalization tank and Aerobic Treatment Unit.
Before 1/1/2014
Install equalization tank and Aerobic Treatment Unit
THE OPERATING PERMIT IS HEREBY GRANTED TO Clty Of SCa11C�18
Permitting Authority Pete Ganzel
Title: Sr. Environmental Specialist
Date: December 20,2011
Signature:
Page 3 of 4
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UPTOWN WASTEWATER SYSTEM MASTER PLAN
City of Scandia, NIN
SEPTEMBER 2011
N11.103386
I hereby certify that this plan,specification or report was prepared by me or under my direct supervision,and that I
am a duly Licensed Professional Engineer under the laws of the State of Minnesota.
i�,�����
Signature: Typed or Printed Name: Brian P.Ma]m,P.E.
Date 9/9/11 Reg.No. 40457
City of Scandia—N11.103386 page{
Uptown Wastewater System Master Plan Prepared by Bolton&Menk,Inc.
TABLE OF CONTENTS
1.0 Introduction......................................................................................................................... 1
1.1 Purpose And Scope................................................................................................................ 1
1.2 Report Organization............................................................................................................... 1
2.0 Existing System .................................................................................................................. 2
2.1 Description Of Existing Wastewater System.........................................................................2
3.0 Existing System Evaluation................................................................................................ 3
3.1 Design Flows And Wastewater Strength...............................................................................3
3.2 Compliance Inspection......................................................................................................... l3
3.3 Performance Issues And Problems ...................................................................................... 14
3.4 Existing Drainfield Evaluation............................................................................................. 16
3.5 System Life Remaining........................................................................................................ 17
3.6 Recommended Improvements.............................................................................................. 18
4.0 Future Regulatory Requirements...................................................................................... 18
4.1 Operating Permit.................................................................................................................. 18
4.2 Nitrogen Treatment.............................................................................................................. 19
4.3 Phosphorus Treatment..........................................................................................................20
5.0 Future System Replacement And Expansion Evaluation ................................................. 21
5.1 Future System Replacement Evaluation..............................................................................21
5.2 Future System Expansion Evaluation..................................................................................21
6.0 Operation And Maintenance Recommendations.............................................................. 23
6.1 General.................................................................................................................................23
6.2 Septic And Pumptanks.........................................................................................................23
6.3 Pumps...................................................................................................................................25
6.4 Soil Treatment Area(Drainfield).........................................................................................26
6.5 Wastewater Sampling ..........................................................................................................27
6.6 O&M Task Summary...........................................................................................................28
7.0 Cost Estimates...................................................................................................................29
7.1 General.................................................................................................................................29
7.2 Wastewater Treatment Improvements.................................................................................29
8.0 Wastewater Budget Review, Enterprise Fund And User Rate Recommendations........... 32
8.1 General.................................................................................................................................32
82 Operation And Maintenance Cost Recommendations.........................................................32
8.3 User Rate Recommendations...............................................................................................34
City of Scandia-M 1.103386 Page ii
Uptown Wastewater System Master Plan Prepared by Bolton &Menk, Inc.
9.0 Discharge Ordinance Recommendations.......................................................................... 39
9.1 General.................................................................................................................................39
92 Recommendations................................................................................................................39
LIST OF FIGURES
Figure
Number Page
3.1 Total Annual Flow 5
3.2 Total Monthly Flow 6
3.3 Average Daily Flow 7
3.4 Average Daily Flow Uptown Pump Station 8
3.5 Design Flow Comparison 10
3.6 Wastewater Characteristics 12
5.1 Contour Loading Rate Example 1 22
5.2 Contour Loading Rate Example 2 22
1 Overall System Plan Appendix
2 Drainfield Area Appendix
3 Community Center and Gammelgarden Appendix
4 Uptown Area and Church Appendix
5 Drainfield Area Improvements Appendix
LIST OF TABLES
Table
Number Page
3.l Design Flows 1 l
6.1 O&M Task Summary 2g
7.1 Cost Estimate Recommended Improvements 30
7.2 Cost Estimate Existing Drainfield Replacement 31
8.1 Annual O&M Costs-No Improvements 32
8.2 Historical Annual O&M Costs 33
8.3 Recommended Annual O&M Costs-With Recommended Improvements 34
8.4 Estimated Sewer Charges-High Base, Low Use Rate 35
8.5 Estimated Sewer Charges-Low Base, High Use Rate 36
8.6 Estimated Sewer Charges with Improvements-High Base, Low Use Rate 37
8.7 Estimated Sewer Charges with Improvements-Low Base,High Use Rate 38
Ciry of Scandia-NI1103386 Page iii
Uptown Wastewa�er Systern Master Plan Prepared by Bolton &Menk, Inc.
APPENDIX
-Soil Boring Report and Logs
-Rate Calculations
-Raw Flow Data
-Sampling Data
-Design Flow Calculations
-Existing System Evaluation Design Calculations
-Compliance Inspection Forms
-As-Built Drawings of System from County Permitting Files
-Example Ordinance—Credit River Township, Scott County
-Example Ordinance—201 System, City of Scandia
-O&M Checklists
-Septic Tank Maintenance Reporting Form
-Area Drinking Water Well Information
Ciry of Scandia—NI1.103386 Page iv
Uptown Wastewater System Master Plan Prepared by Bolton &Menk,Inc.
1.0 INTRODUCTION
1.1 Purpose and Scope
The primary objective of the Uptown Wastewater System Master Plan is to evaluate the
current system and to recommend a course of action to maintain the current system's
condition, capacity and performance while planning far future repair, replacement and
possible expansion of the system. Specific plan objectives include the following:
Assess the current condition, performance, and capacity of the system, including:
• Identify current users of the system, their wastewater characteristics, impact on the
system, and potential for expansion or upgrade among current users
• Estimate the impact of inflow and infiltration (I&I) on the system
• Make recommendations for operation and maintenance to improve and preserve the
system's condition and to extend the life of the current system
• Review the wastewater budget and make recommendations regarding the
development of a wastewater enterprise fund and appropriate user rates
Forecast future costs of maintenance and repairs to properly manage the system,
including:
• Make recommendations for controlling or prohibiting undesirable discharges to the
system and recommend implementation strategies including ordinance language
� Prepare a description, cost estimate, and time table for future replacement of the
system, including evaluation of the City-owned drainfield expansion site
• Estimate the potential for growth and new service connections, including evaluating
the feasibility of expanding system capacity
� Assess the impact of likely regulatory changes on the system, with cost impacts
1.2 Report Organization
To adequately address the major areas that were evaluated, this report is organized into
nine sections as follows:
1. Introduction
2. Existing System
Ciry of Scandia—N11.103386 page]
Uptown Wastewater System Master Plan Prepared by Bolton &Menk, Inc.
3. Existing System Evaluation
4. Evaluation of Future Regulatory Requirements
5. Future System Replacement and Expansion Evaluation
6. Operation and Maintenance Recommendations
7. Cost Estimates
8. Wastewater Budget Review, Enterprise Fund and User Rate Recommendations
9. Discharge Ordinance Recommendations
2.0 EXISTING SYSTEM
2.1 Description of Existing Wastewater System
The existing wastewater treatment system for the Uptown WW System is a soil based
subsurface sewage treatment system (SSTS), or septic system, consisting of a gravity
collection sewer with four lift stations, fourteen septic tanks ranging in size from 1,000-
gallons to 3,000 gallons, and a gravity fed drainfield with nine drop box fed trench
laterals (2,250 ft of trench) comprising 6,750 square feet of absorption area. The system
also includes a small four lateral (400 ft of trench) reserve/backup drainfield located
adjacent to the Community Center. The collection system can be divided into four areas:
the Uptown Area, the Church, the Community Center, and the Gammelgarden Museum.
The following businesses/buildings are served by the system in each area:
• Uptown Area
o Schmitt Malll
o Yoga Hus
o R&B Auto
o Scandia Cafe
o Scandia Store and Deli
o Anyo Salon
o Scandia Veterinary Clinic
� Church
o Elim Lutheran Church
o Elim Church Parsonage
� Community Center
' Consists of multiple businesses in two buildings;Edward Jones, Scandia Family Dental, Scandia Hair Design,
Health Insurance Mart,Superior Land Preservation,Wilkerson Associates, Scandia Chiropractic Clinic
Ciry of Scandia—N11.103386 � Page�
Uptown Wastewater System Master Plan Prepared by Bolton &Menk,Inc.
o Scandia Community Center/City Hall
o Maintenance Shop
o Warming House
• Gammelgarden Museum
o Gammelgarden Museum and Visitors Center
The Uptown collection system and original six lateral drainfield serving the Uptown and
Church areas were constructed in 1995. The Community Center was connected to the
system in 1999 (presumably at this time the existing drainfield at the Community Center
was relegated to reserve/backup status). In 2001, the Gammelgarden Museum was
added to the system. At some point in either 1999 or 2001, the drainfield was expanded
from six laterals to the current nine laterals. Washington County records show the total
permit design flow for the system to be 4,060 gpd.
Figures 1-4 in the appendix show the configuration of the existing system.
3.0 EXISTING SYSTEM EVALUATION
3.1 Design Flows and Wastewater Strength
Design of a wastewater treatment facility is based on two primary factors, the wastewater
flow and the wastewater loading or strength. Flow is typically measured in gallons per
day (gpd) and the facility design is typically based on the Average Daily Flow (ADF).
Wastewater strength typically measured based on the following parameters: Biochemical
Oxygen Demand (BOD), Total Suspended Solids (TSS). BOD is the measure of the
oxygen depletion demand of the wastewater, while TSS is largely a measure of quantity
of solids in the wastewater. Typical residential wastewater strength characteristics prior
to any type of treatment are as follows:
• BODS - 270-400 mg/1
• TSS - 300-400 mg/1
Following treatment in a properly sized septic tank, residential strength wastewater is
expected to have the following characteristics:
� BODS - 140-220 mg/1
• TSS - 45-65 mg/1
City•of Scandia-NIIJ03386 Page 3
Uptown Wastewater System Master Plan Prepared by Bolton &Menk, Inc.
Providing additional pre-treatment with aerobic septic tanks can reduce BOD and TSS to:
• BODS < 25 mg/1
• TSS < 30 mg/1
In addition to wastewater flows and strength, wastewater contains viruses and pathogens
that must be removed prior to discharge. In soil based treatment systems, viruses and
pathogens are naturally removed in the soil beneath the drainfield. Depending upon the
strength of the wastewater discharging to the drainfield, and the texture of the soil
beneath the system, a thickness of 1 to 3 feet of unsaturated soil beneath the system is
required to sufficiently remove viruses and pathogens from the wastewater. The distance
between the elevation at which periodic saturation occurs (also referred to as the
restrictive layer) in the soil and the bottom of the drainfield system is referred to as the
separation distance.
Although the City of Scandia is not currently required by permit to monitar flows for the
system, water use data is collected through water meter readings for billing purposes.
Ciry of Scandia—N11.103386 Page 4
Uptown Wastewater System Master Plan Prepared by Bolton &Menk,Inc.
Figure 3.1 shows the total annual flow for the system based on water meter readings for
the entire system from 2004 to 2010.
Figure 3.1 - Total Annual Flow
(Based on Water Meter Date)
aoo,000 . _ __ __ ___ _ _ _,
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Ciry of Scandia—N11.103386 Page 5
Uptown Wastewater System Master Plan Prepared by Bolton&Menk, Inc.
Figure 3.2 shows the total monthly flow for the system based on water meter readings for
the entire system from January 2004 to June 2011.
Figure 3.2 - Total Monthly Flow
(Based on Wete�Meter Data�
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C Q � n � Q � � C 6 ' `Q � E , s C G 7 s = E 7 s C Q ^ �Q � C
� O � OV A O A O tp O A Q i7 O A
Ciry of Scandia—Nl l J03386 Page 6
Uptown Wastewater System Master Plan Prepared by Bolton &Menk,Inc.
Figure 3.3 shows the ADF based on water meter readings for the entire system from
January 2004 to June 2011.
Figure 3.3-A�erage Daily Flow
(Sased on Water Meter Data�
5,000 �� ; � � � ; - r ,_
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� = � v ? = � �, ? _ � d � _ > �, > = ? v ? = > v � = > v � _
�7 � 9 f0 � � �7 p, 7 9 l0 q � a t7 Q � 9 R q � � f7 {� 7 � i7
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As the figure indicates, ADF based on water meter data is in the 2,000 gpd range.
However, water meter data is not always an accurate representation of wastewater flow.
Water meter data will not indicate whether the system is receiving inflow and infiltration
(I&I) (clean surface water or groundwater entering the system). In addition, water meter
data also includes exterior water use (e.g. lawn watering) which does not contribute flow
to the sewer system. A better measure of wastewater flow is flow data from pumping
stations.
Of the four pumping stations in the system, the Uptown pump station receives the
majority of the flow from the system (80°Io). The Uptown pump station control panel
City of Scandia-NI1.103386 page 7
Uptown Wastewater System Master Plan Prepared by Bolton &Menk,Inc.
includes event counters, which record each time the pumps turn on. If the pump-out
volume for each pumping event is known, the event counter readings can be used to
estimate flow to the pump station. Figure 3.4 shows a comparison of the water meter
flows and the pump station flows for the Uptown pump station.
Figure 3.4 - Average Daily Flow Uptown Pump Station
s.000 i ; ' : i i , ' i
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? A `m ' � d ' m' v ' m' `m ' ,a' m �' .��i m ' m' `m i n
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As the figure shows, the data does not correlate very well, and little conclusion can be
drawn from the pump data. There are two likely reasons the data is unreliable. First,
calculation of flow based on event counters is dependent on the pump-out volume. The
pump-out volume is set based on the distance between the on and off float in the pump
station. If the pump-out volume is known for the entire reporting period then the flows
should be accurate. However, if the float positions have changed over time and the
current pump-out volume is different than in the past, then the flows can't be calculated
accurately. Figure 4.2 assumes that the pump-out volume was constant over the 7-year
reporting period. However, we understand the one of the pumps was changed out in the
Ciry of Scandia-N11.103386 Page 8
Uptown Wastewater Systern Master Plan Prepared by Bolton &Menk, Inc.
fall of 2010. Given that the floats are tied to the pump discharge piping, it is likely that
the pump-out volume was changed at that time. This would make all of the data prior to
that invalid. The second likely reason the data is unreliable is that the event counter
method of ineasuring flow does not take into account the fact that water is often flowing
into the pump station during pumping events at variable rates. This makes the actual
pump-out volume impossible to calculate with event counters. A more accurate method
of ineasuring flows in a pump station is to incorporate elapsed time meters (ETM's).
ETM's record the amount of time each pump runs in minutes. Since the flow rate of the
pumps in gallons per minute (gpm) can easily be calculated and does not significantly
change over time, the total flow pumped from the station can be accurately calculated.
Since the pump data for the largest portion of the system is not reliable, it is difficult to
determine whether I&I in the system is significant. Based on our on-site observations,
experience with collection systems of this type, as well as the observations of City staff,
we suspect that there is some I&I contribution to the system, and the flow calculations for
any replacement or expansion of the system should take this into account. This is
typically done by applying a peaking factor (typically 4) to the measured ADF flows to
obtain a Maximum Day Flow (MDF).
In addition to the water meter flow data for the system, we also have the original design
flow data. In the absence of ineasured flow data, MPCA rules Chapter 7080 for SSTS
require that flows be estimated using typical flow rates for similar businesses. Figure 3.5
show the design flow rates for the system using the original design data, 2010 measured
flows, and Chapter 7080 estimated flows.
City of Scandia—NI1 J03386 page 9
Uptown Wastewater System Master Plan Prepared by Bolton &Menk, Inc.
Figure 3.5 - Design Flow Comparison
iz,000
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; . o i � ■Originai Oesign Flow
.. ry . � n ; ry � �
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' ^' : �
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2,� , .�'.� m - o � o o ■Ch 708G Estimated Flow
. � �n m � - "' N � � .
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As the figure shows, there is a significant difference in the flow for each scenario. Since
both the original design flow, and the Chapter 7080 flows are purely estimates, we will
use the measured flows as a basis for the calculations in the remainder of this plan as
follows:
Ciry of Scandia—NI1.103386 Page]0
Uptown Wastewater System Master Plan Prepared by Bolton &Menk,Inc.
Table 3.1
Design Flows
Uptown WW System
Average Daily Maximum Day
Flow (ADF)* Flow (MDF)**
Uptown & Church 1502 gpd 6010 gpd
Parsonage 150 gpd 600 gpd
Gammelgarden 51 gpd 205 gpd
Community Center 180 gpd 720 gpd
Warming House l42 gpd 568 gpd
Total System 2026 gpd 7535 gpd
*Based on 2010 Measured Flows
** Peaking Factor=4
As previously mentioned, in addition to flow, wastewater strength is a significant factor
in the design of a wastewater treatment system. In order to determine the wastewater
strength, samples were taken throughout the system and sent to a lab for analysis. The
samples were analyzed for BODS, TSS, Fats Oils & Grease (FOG), Nitrate + Nitrite
Nitrogen, Total Kjeldahl Nitrogen (TKN), Dissolved Oxygen (DO), pH, and
Temperature. Figure 3.6 shows the results for BOD, TSS, and FOG for each tank
sampled, as well as the flow associated with each tank.
Ciry of Scandia-N11.103386 page��
Uptown Wastewater Sys�em Master Plan Prepared by Bolton &Menk, Inc.
Figure 3.6 - Wastewater Characteristics
■c30Dimg�tj � , 2,000
� I
�iS5{mg,9) .,
�-- +
�oG imB,41 _ __ _ _ � ; 1.800
..
�2010 Average Daily Flow ro 7artk(gpd� !
i
_c�__ _ __� `� _. _ � _ _ -- - -- _---- — _ _ _- i 1,600
___ - - -- _ - . _ _ _ __ __. - _ __ _ _ _ _ _t 1,400
i
. ____ ___. ..._____ ____---._ __-.- -- _ _. . ._ _ __ __ _ _ __ I 1,200 �
' E
� �
0
__ _ _ i,000 N
�
c
; 800 �
_ _ -- --__ ___ __ __ _ _ _ �
_ _ _ __ ___ . - -- _ _-. � I' 600
_ _ _ __ _ 4fJd
� � Q M ry
r.i
� � m � " � ,
- --- _ —=�- --"..�__—----- —"- - ---— - 200
aes�!-Ysa�screng�h==17o mgn �
m m n ry � W
Resf�Rci�{Strerigth<_bOmg/I MC � 'A n� ^ .j v+ v� d n
Re,�rn_�t�lSaengrfi<=25mgA - — -_ �...:r ---�=_R ...___ _ :_ _ � _ —.T- -_ ..,,-; 0
Upiau�nPwnp Up'.vwnW�mp Upkverniar.kF Uptwrniank2 Parsonageiant Gamme�ar6en Communi!y CammuMty Ora�nfielckTank
rank(a8'� iank(a8" (3,OOOga1) (1,200gaq (i,000ga1; 7ank1f1,400 Centeriar.kl cen'eriank2 L(i,500ga1t
Dymeter) Dlameter) gai� (.,SP7gai) f.,500ga1}
All of the samples with the exception of the Uptown Pump Tank were taken on 6/1/11
and 6/14/11. The Uptown Pump Tank samples were taken on 10/l l/10 and 4/19/11. As
the figure shows the overall wastewater strength for the Uptown tanks and Community
Center tanks are elevated. We understand that the Uptown tanks were pumped on
5/23/11,just prior to sampling. This may account for the lower waste strength levels in
the Uptown Tank 2. The extremely elevated BOD level in the Drainfield Tank is cause
for concern. Additional sampling is recommended to verify that the result is not an
anomaly. Overall, the elevated waste strength is not unexpected given the nature of the
wastewater sources which include commercial kitchens.
TKN levels for the samples ranged from 9.5 to 77.4 mg/1 with the Drainfield Tank
sample (representing the flow from the entire system) yielding a result of 72.9 mg/1. All
of the nitrate+nitrite levels were all less than 0.2 mg/1. TKN added to the nitrate+nitrite
levels yields Total Nitrogen. Total nitrogen levels in residential strength septic tank
Ciry of Scandia—Nl]J03386 PQBe 12
Uptown Wastewater System Master Plan Prepared by Bolton &Menk, Ine.
effluent are typically in the 50-60 mg/1 range, so the level at the Drainfield Tank is
elevated. The low nitrate+nitrite level is not unexpected as the wastewater is not aerated
at any point in the system. Further discussion on nitrogen levels is included in Section 4.
3.2 Compliance Inspection
As a part of our field investigations completed on 6/1/11 and 6/14/1 l, we completed a
compliance inspection for the system in accordance with MPCA rules and Washington
County Ordinance. A copy of the compliance inspection form is included in the
appendix. MPCA rules dictate that four issues be addressed in a compliance inspection:
• Hydraulic Performance
o The system must not allow sewage to discharge to the ground surface, a
tile, or surface waters. In addition, the system must not cause sewage to
back up into a dwelling or establishment.
• Tank Integrity and Safety Compliance
o Septic tanks in the system must not constitute a seepage pit or leak below
their designed operating depth. In addition, tank covers and maintenance
access holes must be structurally sound and not allow someone to fall into
the tank.
• Soil Separation Compliance
o For systems constructed prior to April 1, 1996 and not in Shoreland or
Wellhead Protection Areas, the system must have 2-ft of vertical
separation from periodically saturated soil. For systems constructed after
April 1, 1996 or system in Shoreland or Wellhead Protection Areas, the
system must have 3-ft of vertical separation (15% reduction allowed in
Washington County Ordinance).
• Operating Permit and Nitrogen BMP Compliance
o If the system has an Operating Permit or Nitrogen BMP, it must be in
compliance with the provisions of the permit and the BMP must be
properly operating.
City of Scandia—N11.103386 Page 13
Up�own Waslewater System Master Plan Prepared by Bolton &Menk, Inc.
Our review of the drainfield area did not reveal evidence of surfacing sewage or any tile
or surface water outlet. All of the tanks were inspected prior to pumping and video
inspected following pumping, and there was no evidence of leaking. The system does not
have an Operating Permit or Nitrogen BMP device, so on three of the four issues the
system is compliant. However, the soils investigation revealed that the drainfield
(portions of which were constructed after April 1, 1996) does not have the required 3-feet
of vertical separation. According to the soil borings and soils report included in the
appendix, borings l-7 (shown on Figure 2), which were completed on the perimeter of
the drainfield, reveal depths to periodic saturation ranging from 12" to 34". Since the
drainfield is a below grade trench system it is not possible for the system to have the
required 3-ft separation. Therefore, according to MPCA rules, the system is non-
compliant. However, since the system is permitted through Washington County, Chapter
4 of the Washington County Ordinance controls. According to Pete Ganzel at
Washington County,paragraph 4.3(9) of the Ordinance would apply to this situation.
Since the system is not an imminent threat to public health, was constructed under a
permit issued by the County, and the vertical separation was verified at the time of
installation, the County wil] not require the system to be upgraded, repaired, or replaced.
3.3 Performance Issues and Problems
Based on our field observations completed on 6/1/11 and 6/l4/11, review of existing data
provided by the City and County, and discussions with City staff, following is a summary
of performance issues/problems with the existing system:
• Uptown Tank 1 has large chunks of soap in it. This is likely the result of
powdered soap use in one of the upstream users. Users should switch to non anti-
bacterial liquid soaps to prevent this.
• Septic tank pumping has not always included backwashing. Backwashing the
tank is essential to ensure maximum removal of sludge and scum from the tank.
• Frequency of septic tank pumping appears to be random, with little or no
documentation or record keeping. Sludge and scum in the tanks should be
measured on a regular basis and a regular pumping schedule should be developed
based on sludge and scum measurements.
City of Scandia—N11.103386 Page 14
Uptown Wastewater System Master Plan Prepared by Bolton &Menk, Inc.
• Uptown Tank 2 shows evidence of possible I&I. Relatively high dissolved
oxygen levels in the tank, considerably reduced wastewater strength compared to
upstream tank indicate possible surface water inflow. Upstream connections
should be checked for possible roof drain or footing tile connections.
• Slightly elevated pH levels in all tanks may be an indication of excessive use of
ammonia or cleaners. Users should minimize use of ammonia and cleaners or
switch to more sepric friendly alternatives.
• Float system in Uptown Pump Tank is in a strange configuration. The high water
alarm is disabled and the high water/lag pump float is set at the same elevation as
the off float. This may have been done on purpose to force dual pump operation
on every pump cycle rather than the standard alternating pump arrangement to
maximize the flow rate. If the pumps are undersized for the peak flow rates, they
should be replaced with larger pumps capable of pumping the required flow rate
and the float arrangement should be returned to a standard three float
arrangement. The volume of this tank is very limited as it is a standard 48-inch
diameter manhole rather than a pump tank. This can cause the pumps to cycle
frequently which increases wear and tear on the pump. A larger pump tank is
recommended.
• Garage floor drains from houses or vehicle maintenance facilities are prohibited
by MPCA and EPA. R&B Auto is a vehicle maintenance facility and has a floar
drain in the service area that has been temporarily/manually plugged. The
integrity of this plug should be verified and if necessary, the floor drain should be
permanently plugged.
• The Scandia Store/Deli uses quaternary ammonia for disinfection of dishes and
utensils. Quaternary ammonia is especially hard on septic systems as it kills the
bacteria necessary for proper wastewater treatment in the septic tank. The Deli
should switch to a more septic friendly disinfectant such as chlorine or iodine.
• A few of the septic tanks observed had a proliferation of band aids, rags, straws
and other non wastewater items in them. Septage from septic tanks is pumped by
licensed maintainers and either land applied at approved sites or delivered to
municipal wastewater treatment plants. The presence of such non wastewater
Ciry of Sca�idia—N11.103386 Page I S
Uptown Wastewater System Master Plan Prepared by Bolton &Menk, Inc.
items in the septage presents a problem for disposal. Users should avoid flushing
non wastewater items down the drain.
• The Warming House pump tank cover is not secure and it appears that youths
using the adjacent skating rink have been tampering with the cover and dumping
bottles and other trash in the tank. The tank cover should be secured to prevent
tampering.
• The Warming House pump tank controls are outdated and include a junction box
located inside the pump tank. The junction box is covered in roots and the pump
tank itself is experiencing severe root intrusion. The pump tank controls should
be replaced with an updated control panel.
• The Parsonage Tank showed evidence of surcharging. If the residents of the
home report that sewage backup has occurred in the past or is a problem, tank
maintenance frequency and water use should be evaluated, and the City should
consider installing a high water alarm on the tank.
� A strange, small diameter(2") ABS pipe appears to be discharging into
Community Center Tank 2. The source of this pipe should be investigated and if
it is a clear water source, the pipe should be re-routed.
� The Maintenance Shop tank appears to be connected to floor drains inside the
shop. Since this would constitute a prohibited discharge, and staff reports water
use in the shop is minimal, this tank should be disconnected from the system and
be used as a holding tank.
• The sapling trees growing in the drainfield area should be cut as their roots have
the potential to clog the drainfield pipe.
• Access covers to several of the septic and pump tanks at the Community Center
and Gammelgarden sites are buried and are not secure. The covers should be
raised and new castings should be installed to prevent accidental or unauthorized
access to the tanks.
3.4 Existing Drainfield Evaluation
As discussed in Section 2, the existing drainfield is a gravity fed trench drainfield system.
There are nine drop boxes feeding 4-inch perforated pipe laterals bedded in rock. The
total drainfield length is 2,250 ft. It is assumed that the trench width is 3-ft and that there
Ciry of Scandia—NI 1.103386 Page 16
Uptown Wastewater Sys�em Master Plan Prepared by Bolton &Menk, Inc.
is 12-inches of rock beneath the pipes. This equates to 6,750 sf of drainfield trench area.
Based on the soils report, the soils in the drainfield area are variable in texture, with a
layer of sandy clay loam being the most limiting condition. This soil texture relates to a
design loading rate of 0.45 gpd/sf. For the ADF of 2,026 gpd, the required drainfield area
is 4,502 sf. Therefore, for the average daily flow, the drainfield has adequate capacity for
treatment. However, at the MDF of 7,535 gpd, the required drainfield area is 16,744 sf.
Therefore, for the maximum day flow, the drainfield is undersized.
If pre-treatment were added to the system, the wastewater loadings would be reduced and
the design loading rate would go up to 0.60 gpd/sf. At the MDF this would reduce the
required drainfield area to 12,558 sf, which is still larger than the existing drainfield size.
This tells us that during most days, the drainfield is of adequate size to serve the existing
system. However, there are days when the flow rates have the potential to overwhelm the
drainfield. To prevent this, and equalization tank is recommended to store the additional
flow and slowly meter it out when the flow rate is reduced. The required equalization
tank size for the system is 10,000 gallons. The equalization tank would include pumps
and a control panel that would allow the drainfield to be dosed with a timer at regular
intervals, which will prevent overloading the drainfield.
In addition, as noted above, the strength of the wastewater flowing to the drainfield is
high. This may cause the drainfield to plug prematurely. A pre-treatment unit such as an
aerobic tank is recommended to reduce the BOD and TSS levels prior to discharging to
the drainfield.
3.5 System Life Remaining
A typical septic system is expected to have a design lift of 20-years. This figure is often
debated, and for good reason as there are many systems that fail earlier than 20-years,
and there are many systems that last longer than 20-years. The reasons for this are many.
The life of a septic system is dependent upon four main factors;design, installation, use,
and management. If a system is designed properly, installed properly, used properly, and
managed properly it can be expected to last for at least 20-years, and likely much longer.
A shortcoming in any of these four factors may cause a system to fail prematurely.
City of Sca�idia—N11.103386 Page 17
Uptown Wastewater System Master Plan Prepared by Bolton &Menk,Inc.
A soil based treatment system is basically a filter. Large particles are removed from the
wastewater by the septic tank. Further removal of solids may occur in pretreatment
devices such as aerobic tanks or engineered filters if they exist. Final treatment of the
wastewater occurs in the soil itself. Ultimately, the long term failure mechanism in a soil
based treatment system is clogging of the soil by the remaining solids discharged to the
soil. Obviously when a system is completed clogged, it is easy to diagnose because the
system will not accept water. However, it is difficult, if not impossible to determine to
what percentage a system is clogged at some intermediate point in its life cycle.
Therefore, assigning a value to the remaining life of a system is really not possible.
It is possible to tell whether a system was designed and installed properly, and it is
possible to tell whether a system is being used and maintained properly. If there are
shortcomings in any of these areas they can and should be corrected to maximize the
remaining life of the system.
3.6 Recommended Improvements
To address the some of the mare pressing issues highlighted in Sections 3.1 and 3.2 we
recommend that the following improvements to the existing system be considered:
• Install equalization tank and aerobic pre-treatment unit at the existing drainfield
• Replace the pump controls at the Warming House pump tank
• Raise access risers and install new access covers on six tanks at the Community
Center and three tanks at the Gammelgarden
• Install run time meters in the control panel for the Uptown Pump Tank and the
Community Center Pump Tank
• Install new, larger pump tank and pumps for the Uptown Pump Tank
• Convert the Maintenance Shop tank to a holding tank
4.0 FUTURE REGULATORY REQUIREMENTS
4.1 Operating Permit
In 2009, Washington County adopted a new SSTS ordinance which incorporated the new
MPCA SSTS rules. A significant new part of this ordinance is the requirement that
systems serving food, beverage, or lodging establishments that discharge high strength
City of Scandia—NI1103386 Page 18
Uptown Wastewater System Mas�er Plan Prepared by Bolton &Menk, Inc.
waste to the soil obtain an Operating Permit from the County. The Operating Permit
must include:
• System maintenance requirements, including frequency of maintenance
� Operational requirements
� Compliance limits and boundaries
• Reporting frequency
• Requirement that permittee notify the Counry when the permit requirements are
not met Corrective action must be taken as directed by the County
• Disclosure of the location and condition of the soil treatment system
• A stipulation of acceptable and prohibited discharges
As a part of the Operating Permit, a Management Plan detailing the necessary operation
and maintenance requirements for the system will need to be developed.
4.2 Nitrogen Treatment
The recently updated MPCA Rules and Washington County ordinance include provisions
for nitrogen reduction in septic systems with design flows greater than 2,500 gpd.
Systems with design flows between 2,500-5,000 gpd that have the potential to impact the
water quality of an aquifer(including shallow private well aquifers) are required to
employ a nitrogen reducing best management practice (BMP). For these systems there is
no nitrogen limit,just the requirement to install a nitrogen reduction device. Systems
with design flows greater than 5,000 gpd are required to reduce nitrogen levels such that
the total nitrogen level at the system property boundary does not exceed 10 mg/1.
Nitrogen exists naturally in wastewater in two forms, organic nitrogen and ammonium.
Ammonium is created through the bacterial decomposition of organic nitrogen. When
wastewater is aerated (air is added), nitrifying bacteria converts the ammonium to nitrite
and then nitrate. Full conversion from nitrite to nitrate is dependent upon an adequate
amount of nitrifying bacteria and enough air. If the wastewater is then placed in an
anaerobic (lack of air)environment and if enough bacteria is present, the nitrate will be
converted to nitrogen gas, which will naturally disperse. This conversion of ammonium
to nitrogen gas is referred to as the nitrification/denitrification process. Unfortunately,
Ciry of Scandia-N11103386 Page 19
Uptown Wastewater System Master Plan Prepared by Bolton &Menk, Inc.
although partial nitrification occurs fairly regularly in wastewater collection and
treatment systems, including septic systems, full nitrification and denitrification is
difficult to achieve. It is dependent upon several factors including, but not limited to
temperature, alkalinity, pH, bacteria, and flow rate. Achieving denitrification often
requires the addition of chemicals such as methanol, ethanol, or other proprietary carbon
sources.
As noted in Section 3, total nitrogen levels for the system were 73 mg/1, and
nitrate+nitrite levels were less than 0.2. Literature suggests that typical effluent total
nitrogen concentrations for residential septic tank effluent are in the range of 50-60 mg/l.
While some nitrification/denitrification may occur naturally in the soil and some dilution
from upgradient groundwater may occur, given the high total nitrogen concentration and
lack of nitrification currently occurring in the system, significant reduction in nitrogen
levels for the system will likely require some level of nitrogen treatment.
If, as a part of the new operating permit requirement, Washington County requires that
the system comply with the new ordinance nitrogen requirements a nitrogen BMP may be
required. If it is determined that the system may have an impact on the water quality of
an aquifer, and given that the design flow is greater than 2,500 gpd and less than 5,000
gpd, a nitrogen BMP, such as an aerobic treatment device, would be required.
If design flows increase above the 5,000 gpd mark, or if more stringent groundwater
monitoring well or end of pipe regulatory limits are enacted, a full
nitrification/denitrification treatment system may be required.
4.3 Phosphorus Treatment
Current regulations only require phosphorus treatment when a system with a design flow
over 5,000 gpd has the potential to impact a surface water with a phosphorus standard in
place. Phosphorus would only be required if a phosphorus standard were placed on the
existing wetland adjacent to the system.
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Uptown Wastewater System Master Plan Prepared by Bolton&Menk,Inc.
5.0 FUTURE SYSTEM REPLACEMENT AND EXPANSION EVALUATION
5.1 Future System Replacement Evaluation
Based on the soils report, the proposed drainfield expansion area located west of the
existing drainfield is suitable for construction of a replacement drainfield system as
needed in the future. However, given the level of periodic soil saturation found, a trench
system would not be allowed. Instead, a mound system would be required. Based on the
limiting soil texture of sandy clay loam, and assuming that pre-treatment and an
equalization tank are provided prior to construction of the replacement drainfield to
reduce flow rates and wastewater strength, a mound designed for an ADF of 2,026 gpd
would require an area 372-ft long by 41-ft wide. A possible configuration and location
for a future replacement drainfield is shown on Figure 5.
5.2 Future System Expansion Evaluation
As shown on Figure 5, there is adequate area available to construct a replacement system
in the expansion area west of the existing drainfield. There also appears to be an area
north of the existing drainfield that would be available for replacement or expansion.
However, an expansion of the existing drainfield cannot be constructed without
jeopardizing the ability to replace the existing system in the future. To understand this it
must be understood how the wastewater discharged through the drainfield moves through
the soil. Wastewater discharged to a soil treatment system not only moves down
vertically through the soil, there is also considerable lateral movement. This is due to
several factors including land slope and the presence of variable soil texture and
consistency beneath the drainfield. In the case of the Uptown WW System drainfield, the
slope of the land is approximately 5% towards the existing wetland adjacent to the
treatment system. This means that in general the subsurface water movement will be to
the north towards the wetland. In soils of the type that exist in the drainfield area (sandy
clay loam), the recommended linear (or contour) loading rate is 6 gal/ft. This means that
no more than 6 gpd should be applied along the contour for each foot of contour length.
To determine the length of the system, the design flow is divided by the contour loading
rate. This is illustrated in Figure 5.1 below:
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Uptown Wastewater System Master Plan Prepared by Bolton &Menk, Inc.
Septctank
iguration 2
100 ft
Configuration 1 �
tlR=600 =6 gal/ft
;�:
�oo{t
zo�
CLR=600 gpd=30 gaUft
20 ft
Figure 5.1 — Contour Loading Rate Example 1
As shown on the figure, configuration 1 has a large width and a narrow length resulting
in a contour loading rate of 30 gal/ft. Configuration 2 has a narrow width and a long
length resulting in the desired contour loading rate of 6 gaUft. Configuration 1 has a high
potential of overloading the soil and experiencing a "breakout" of sewage downslope.
In the same manner, "stacking" a system upstream of another has a similar effect as
Configuration 1 in Figure 5.1. As shown in Figure 5.2 below, "stacking" a system
downstream of another can result in a larger than desired contour loading rate.
�
Septictank 50'
�
50'
tLR=600 =12 gallh
50 tt
Figure 5.2—Contour Loading Rate Example 2
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Uptown Wastewater System Master Plan Prepared by Bolton&Menk, Inc.
With this in mind, although there is space to expand the drainfield to the west and add
new users to the system, doing so would eliminate the ability to construct a replacement
drainfield either uphill or downhill of the expansion drainfield. In addition, although
there appears to be space to expand the drainfield downhill to the north of the existing
drainfield, doing so would preclude the use of the existing drainfield. Therefore, it is our
determination that there is not available area to expand the existing drainfield and add
new users to the system without eliminating the City's ability to replace the existing
drainfield in the future.
6.0 OPERATION AND MAINTENANCE RECOMMENDATIONS
6.1 General
As discussed in Section 3,proper operation and maintenance of the system is essential to
maximizing its life. It is recommended that the City establish written operation and
maintenance (O&M) procedures and implement them immediately. This section will
make recommendations on the types of O&M activities that should be undertaken and
recommend frequencies for the activities. These O&M activities should be completed by
qualified professionals. Industry standard checklists for recording the various O&M tasks
are provided in the Appendix.
6.2 Septic and PumpTanks
The septic tank performs the first step of the wastewater treatment process. It is a
watertight tank that provides the primary treatment in a septic system. As sewage enters
the septic tank, those solids that are heavier than water settle to the bottom, forming a
sludge layer, and those solids lighter than water float to the top, forming a scum layer.
Between the sludge layer on the bottom and the scum layer on the top is a clear zone
from which the outlet baffle takes the relatively clear effluent and allows it to flow out
into the soil treatment system. Periodically, the contents of the tank must be pumped out
and disposed of. If the solids on the bottom, or the scum layer on the top build-up to a
point that they flow out of the tank and into the soil treatment unit, they can quickly clog
the soil treatment system, causing failure.
The components of the septic tank includes an inlet baffle, an outlet baffle or effluent
filter, inspection pipes, and an access or cleaning manhole for each compartment of the
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tank. The inlet baffle ensures that entering wastewater becomes mixed with the liquid
contents of the tank to begin bacterial breakdown of organic materials and separation of
solids. The inlet baffle also prevents the floating scum layer from floating back and
clogging the inlet pipe.
The outlet baffle or effluent filter ensures that only liquid is able to leave the tank and
enter the soil treatment system (drainfield). If the scum layer reaches the outlet pipe, the
pipe would quickly become plugged and scum in the drainfield would cause it to fail.
Inspection manholes are typically located above the inlet and outlet of the tank, however,
on older tanks there may be only one manhole located either at the inlet, outlet, or center
of the tank. These manholes allow for inspection of inlet and outlet pipes and baffles.
Clogs in the inlet or outlet pipes can be unplugged through the inspection manholes.
When operating, the septic tank is always "full" to the level of the bottom of the outlet
pipe.
MN Rules Chapter 7080 require that septic tanks be checked for leakage and that the
accumulation of sludge and scum be measured regularly but in no case less frequently
than every 3 years. There are several septic tanks of varying size and receiving varying
flows and wastewater strengths in the system. Although MN Rules require that the tanks
be pumped at a minimum every 3 years, it is likely that most of the tanks in the system
will need to be pumped with greater frequency. The actual frequency should be
determined by regularly measuring the scum and sludge depth in the tanks and
calculating the amount of time it is taking for the tanks to fill up. This time will vary
based on the flow rate, wastewater strength, and tank size. MN Rules require that the
tanks be pumped when the scum and sludge depth reached 25% of the tank depth or when
the sludge layer is closer than 12-inches to the bottom of the outlet baffle or when the
bottom of the scum layer is closer than 3-inches to the bottom of the outlet baffle. For
the O&M costs included in Section 8, we assumed that an average of 10 of the 14 tanks
in the system will need to be pumped every year. Over the next year, it is recommended
that the City purchase a "sludge judge" and measure the sludge and scum depth in the
tanks on a monthly basis to establish a baseline for how fast the tanks are filling. After
Ciry of Scandia—NI1.103386 PaSe 24
Uptown Wastewater System Master Plan Prepared by Bolton &Menk,Inc.
collecting this data, a more accurate determination on the frequency of tank pumping can
be made.
Pumping should be completed by a business licensed by the MPCA as a certified
Maintainer. It is important that the maintainer follow industry standard procedures when
pumping the tanks, including mechanical mixing and/or backflushing. Since the sludge
and scum in the tank are separated from the clear water, simply pumping the tank will not
completely remove the accumulated sludge and scum. The sludge and scum must be
mixed prior to pumping to ensure maximum removal of sludge and scum. If only clear
water is pumped from the tank, the purpose of pumping the tank is defeated. The Septic
Tank Maintenance form included in the Appendix should be completed by the certified
Maintainer and submitted to the City within 30 days in accordance with MN Rules
Chapter 7083.0770 subp. 2.
In addition to checking for leaks, the manhole lids and/or inspection pipes should be
checked to make sure they are secure, and the septic tank baffles should be checked to
make sure they are in place, functioning, and clear of obstructions. These checks should
be made each time the tank is maintained.
Although the septic tanks should remove the majority of sludge and scum, sludge buildup
does occur in pump tanks over time. Therefore, pump tanks should also be checked for
sludge and scum buildup and the sludge should be pumped out before it comes within 1-
inch the pump intake. The pump controls, floats and alarm should be checked to verify
that they are operating correctly. Run time meters and/or event counters should be
verified for operation, read, and recorded. Pump tanks should be checked at the same
time the adjacent septic tank is pumped, and should be pumped at the same time if the
sludge level dictates. Frequency of run time meter recording is discussed below.
6.3 Pumps
The pumps and motors should be checked on a regular schedule as recommended by their
manufacturer. The pumps should be observed to check for noisy operation. If a pump is
noisy, it should be removed for inspection and repair.
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Uptown Wastewater System Master Plan Prepared by Bolton &Menk, Inc.
The pump controls, floats and alarm should be checked to verify that they are operating
correctly. Faulty floats or a malfunctioning alarm should be immediately replaced. Run
time meters and/ar event counters should be verified for operation, read, and recorded.
Ideally, the meters should be read and recorded on a daily basis. This will provide the
best possible data for determining maximum day flows to the drainfield. If this is not
possible, they should be read and recorded on a weekly basis at a minimum. If one pump
shows greater run time than the others, it should be checked for proper operation and
settings.
Pump-down tests should be conducted on each pump annually to determine the pumping
rate. The pumping rate should be compared to the design rate and/or the previously
determined pumping rate to determine whether any change has occurred. Changes in
pumping rate can indicate a problem with the pump, pump motor, discharge piping
assembly, or forcemain pipe.
6.4 Soii Treatment Area (Drainfield)
The soil treatment area (drainfield) consists of 4-incb diameter pipe flowing from the
septic tank to nine drop boxes. Each drop box has 4-inch diameter perforated lateral
pipes that distribute wastewater to the rock filled drainfield trenches.
The drop boxes function by forcing water to flow out to the 4-inch perforated lateral
pipes serving the drainfield trenches and flood the trenches prior to overflowing into the
next drop box. The drop boxes have inspection pipes and the pipes connected to the drop
box can be viewed. There will normally be water present in the bottom of the drop box,
and if the laterals have received flow recently there may be ponding in the pipe and the
water may be flowing to the next drop box. The drop boxes should be inspected to verify
the level of ponding in the lateral pipes (if any) and that the pipes connected to the drop
box are free from obstruction. If the lateral pipes are submerged and there does not
appear to be flow moving to the next drop box, the pipe connecting the drop boxes may
be plugged. The inspection pipes themselves should be checked for damage, have secure
caps that are removable, should extend above grade, and should be repaired as necessary.
Each drainfield trench has an inspection pipe located at the end of the trench for the
purpose of determining the level of ponding in the drainfield. The level of ponding in
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Uptown Wastewater System Masier Plan Prepared by Bolton &Menk, Inc.
each drainfield lateral should be checked and the level recorded. It is normal for ponding
to exist in the drainfield trenches themselves. Under normal operating conditions, the
trenches should have less ponding as you move downstream and it is likely that the last
few trenches will be dry. If all of the trenches have ponding, that is an indication that the
system is overtaxed and may be at or near failure.
In addition to checking the drop box and trench inspection pipes, the surface and
perimeter of the drainfield should be checked for surfacing effluent or other signs of
problems. Trees growing in the drainfield and within 5-ft of the drainfield area should be
cut off at ground level (do not grub stumps or attempt to pull out the roots as this may
damage the drainfield).
Vehicles should not be allowed on the drainfield and mowing should be done at minimal
intervals and should be completed during dry periods with a push mower to avoid
compaction of the drainfield.
Surface water from adjacent areas should not be allowed to flow across the drainfield
area and any surface ponding from rainwater on the drainfield should be corrected as
soon as possible.
6.5 Wastewater Sampling
Samples should be taken from the system at regular intervals to determine the wastewater
strength. It is recommended that samples be taken at the Uptown Pump tank and at
Drainfield Tank 1 two times per year. The samples should be tested for:
• CBODS
• TSS
• FOG (Fats, Oils, & Grease)
� Nitrate + Nitrite
• TKN
• Total N
The samples taken from the Uptown Pump Tank will be representative of the wastewater
strength coming from the Uptown Area and the Church, while the samples taken from the
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Uptown Wastewater System Master Plan Prepared by Bolton&Menk, Inc.
Drainfield Tank will be representative of the wastewater from the entire system and what
is ultimately flowing to the drainfield.
6.6 O&M Task Summary
Table 6.1 below shows a summary of the recommended O&M tasks and their frequency.
Table 6.1
O & M Task Summary
U town WW S stem
Task Fre uenc
Septic and PumpTank Pumping and Varies, minimum every 3 years
Inspection
Pump and Control Panel Checks Same schedule as septic tank pumping schedule,
minimum once er year
Pum Down Test Annual
Wastewater Sampling Uptown Pump Tank and Drainfield Tank 1 —
Sample Each Tank 2 Times per Year
Pump Run Time Meter Readin Recommended daily, minimum once per week
Drainfield Inspection Monthly
City of Scandia—N11.103386 Page 28
Uptown Wastewater System Master Plan Prepared by Bolton &Menk,Inc.
7.0 COST ESTIMATES
7.1 General
The construction cost estimates presented herein are based on present day construction
costs (2012).
In order to prepare the preliminary construction cost estimates presented herein, various
material and equipment manufacturers and suppliers were contacted. Published and
unpublished data on costs for similar kinds of construction were also utilized. Increases
in construction costs due to inflation are not taken into account. The cost estimates
presented here are meant to be used as a guideline for planning purposes.
7.2 Wastewater Treatment Improvements
Table 7.1 presents a construction cost summary for the recommended system
improvements. Table 7.2 provides the cost for the existing drainfield replacement.
City of Scandia—N11.103386 Page 29
Uptown Wastewater Systern Master Plan Prepared by Bolton&Menk,Inc.
Table 7.1
Cost Estimate
Recommended System Improvements
Uptown WW System
Item Unit Estimated
No. Item Unit Price Quantity Total
Install E ualization Tank And Aerobic Pre-Treatment Unit At Drain�eld
1 Connect To Existing Sewer Pi e EA $200.00 2 $400.00
High Strength Fast 3.0 Aerobic Treatment Unit
2 &4,000 Gallon Tank EA $25,000.00 1 $25,000.00
3 2"Forcemain Pi e LF $15.00 30 $450.00
4 4"Pvc Sewer Pi e LF $20.00 30 $600.00
10,000 Gallon Equalization Tank,Pumps&
5 Panel-Main Drainfield EA $27,000.00 1 $27,000.00
6 F&I Septic Tank Effluent Filter EA $300.00 1 $300.00
7 TurfRestoration LS $1,000.00 1 $1,000.00
Subtotal $53,050.00
15%Contin enc $7,957.50
Total Estimated Construction Cost $61,007.50
En ineerin &Cit Administration $12,201.50
Total Estimated Cost $73,209.00
Re lace Controls-Warmin House Pum Tank
1 Replace Controls-Warming House $1,800.00 $1,800.00 $1,800.00 $1,800.00
Subtotal $1,800.00
15%Contingency $270.00
Total Estimated Construction Cost $2,070.00
En ineerin &Cit Administration $414.00
Total Estimated Cost $2,484.00
Raise Access Risers And Install New Se tic Tank Covers
Raise Access Risers And Install Secure Tank
1 Covers At Communit Center EA $600.00 6 $3,600.00
Raise Access Risers And Install Secure Tank
2 Covers At Gammelgarden EA $600.00 3 $1,800.00
3 Turf Restoration LS $500.00 1 $500.00
Subtotal $5,900.00
15%Contingenc $885.00
Total Estimated Construction Cost $6,785.00
En ineerin &Cit Administration $1,357.00
Total Estimated Cost $8,142.00
Install Run Time Meters In Pum Control Panels
Install Dual Run Time Meters In Uptown
1 Pum Tank EA $300.00 1 $300.00
Install Dual Run Tim Meters In Community
2 Center Pump EA $300.00 1 $300.00
Subtotal $600.00
l5%Contingency $90.00
Total Estimated Construction Cost $690.00
En ineering&Cit Administration $138.00
Total Estimated Cost $828.00
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Uptown Wastewater System Master Plan Prepared by Bolton &Menk,Inc.
Item Unit Estimated
No. Item Unit Price Quantity Total
Install New U town Pum Tank
1 Remove Pum Tank(48"Dia Manhole) EA $800.00 1 $800.00
2 1,000 Gallon Pum Tank&Pum s-U town EA $13,000.00 l $13,000.00
3 Expose And Raise Cleanout EA $200.00 3 $600.00
4 Cleanout Casting EA $250.00 3 $750.00
5 Bituminous Patch SY $45.00 75 $3,375.00
Subtotal $18,525.00
15%Contingency $2,778.75
Total Estimated Construction Cost $21,303.75
Engineering&City Administration $4,260.75
Total Estimated Cost $25,564.50
Convert Maintenance Sho Tank To Holdin Tank
1 Disconnect Sewer Pi e EA $200.00 1 $200.00
2 Turf Restoration LS $500.00 1 $500.00
Subtotal $700.00
15%Contingency $105.00
Total Estimated Construction Cost $805.00
En ineerin &Cit Administration $161.00
Total Estimated Cost $966.00
Total All Im rovements
Subtotal $80,575.00
15%Contin enc $12,086.25
Total Estimated Construction Cost $92 661.25
En ineerin &Cit Administration $18,532.25
Total Estimated Project Cost $111,193.50
Table 7.2
� Cost Estimate
Existing Drainfield Replacement
Design Flow 2,026—Assumes Equalization Tank Already Complete
Uptown WW System
Item Estimated
No. Item Unit Unit Price Quantit Total
1 Mobilization LS $2,000.00 1 $2,000.00
2 Connect To Existing Sewer Pipe EA $200.00 1 $200.00
3 1,000 Gallon Pump Tank&Pumps EA $13,000.00 l $13,000.00
4 Controls LS $2,000.00 1 $2,000.00
5 2"Forcemain Pi e LF $12.00 450 $5,400.00
6 Zone Distribution Valve EA $500.00 1 $500.00
7 Se tic Mound SF $2.50 15,188 $37,970.00
8 Turf Restoration LS $2,000.00 1 $2,000.00
Subtotal $63,070.00
15%Contin ency $9,460.50
Total Estimated Construction Cost $72,530.50
Engineering&Administration $14,506.10
Total Estimated Pro'ect Cost $87,036.60
City of Scandia—NI1.103386 Page 31
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8.0 WASTEWATER BUDGET REVIEW, ENTERPRISE FUND AND USER RATE
RECOMMENDATIONS
8.1 General
We understand the past practice for the system has been to total the annual expenditures
for the system plus a depreciation expense for the drainfield replacement, and allocate the
costs on a percentage basis based on each user's percentage of the total water pumped.
Billings are made on an annual basis. This has resulted in unpredictable costs for system
users as well as lack of reserve funds for necessary maintenance and repairs. We
understand that the City would like to implement an enterprise fund for the system and
establish a more traditional utility billing system.
8.2 Operation and Maintenance Cost Recommendations
The recommended annual operation and maintenance (O&M) costs are based on
personnel, laboratory and testing services, utilities, equipment maintenance, and
miscellaneous operating expenses. Table 8.1 details the recommended O&M costs for
the system assuming no improvements are made to the system.
Table 8.1
Recommended Annual O &M Costs—No Improvements
U town WW S stem
Item Amount
Salaries, Payroll Taxes, and Employee Benefits $4,427
Professional Fees $500
Office Ex ense $100
Utilities $175
Testin $600
Licenses $500
Se tic Tank Pum in - $3,250
Pum Re lacement- $500
Control Panel Re lacement - $450
Misc. Supplies - $100
Re airs, Maintenance, & Su lies $4,300
Miscellaneous $100
Insurance $150
TOTAL $10,852
Variable Costs - $3,425 (Utilities and Septic Tank Pumping)
Fixed Costs - $7,427
City of Scandia—Nl]J03386 Page 32
Uptown Wastewater Syste�n Master Plan Prepared by Bolton &Menk,Inc.
For comparison purposes, Table 8.2 shows the historical annual O&M expenditures on
the system. �
Table 8.2
Historical Annual O &M Costs
Uptown WW System
Year Amount
1997-98 $2,650
1998-99 $1763
1999-00 $3,600
2000-01 $2,300
2001-02 $2,500
2002-03 $2,700
2003-04 $4,900
2004-OS $2,135
2005-06 $2,645
2006-07 $2,476
2007-08 $3,309
2008-09 $1,469
2009-10 $4,738
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Table 8.3 details the recommended O&M costs for the system assuming the
recommended improvements discussed in Section 3.6 are made to the system.
Table 8.3
Recommended Annual O & M Costs—With Recommended Improvements
U town WW System
Item Amount
Salaries, Pa roll Taxes, and Em lo ee Benefits $4,427
Professional Fees $500
Office Expense $100
Utilities $900
Testin $600
Licenses $500
Septic Tank Pum ing- $3,250
Pump Replacement- $1,000
Blower Re lacement - $250
Control Panel Replacement- $750
Misc. Supplies - $100
Repairs, Maintenance, & Supplies $5,350
Miscellaneous $100
Insurance $150
TOTAL $12,627
Variable Costs - $4,150 (Utilities and Septic Tank Pumping)
Fixed Costs - $8,477
8.3 User Rate Recommendations
In a typical water utility rate system there is a base rate and a useage rate. The base rate
is a fixed rate charged to each user regardless of their water use. Ideally, the base rate
should cover the fixed costs in the system, as those costs do not fluctuate with use of the
system. The useage rate is meant to cover the variable costs in the system, such as utility
costs or other costs that are directly affected by use of the system. Ideally, each user pays
a minimum charge (the base rate) while the remaining charge is dependent upon their
water use.
For this system we have prepared two options. The first option adopts the philosophy of
covering the system fixed costs with the base rate revenue and the remaining costs with
the useage rate revenue. The second option reduces the base rate and increases the
useage rate to more closely relate to the previous billing system which was completely
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useage based. Since O&M costs willlikely increase as time goes on due to inflation, it is
recommended that the City consider rate increases on an annual basis with a rate increase
of 3% as a standard. This will avoid having to consider random large rate increases in the
future to "catch up" with increasing O&M costs.
Table 8.4 represents the estimated sewer charges for the High Base Rate, Low Use Rate
option.
Table 8.4
Estimated Sewer Charges
High Base Rate, Low Use Rate Option
Uptown WW System
Base Rate- $78.00/month
Use Rate- $5.00/1000 gal
Avg. Avg.
Monthly Annual Avg.
Water Water Monthly Avg.
Use* Use* Sewer Annual
User (gal) (gal) Bill Sewer Bill
Schmitt Mall �,513 90,156 $115.57 $1,386.78
Yoga Hus 327 3,924 $79.64 $955.62
R&B Auto 5,564 66,768 $105.82 $1,269.84
Scandia Store/Deli/Cafe 19,955 239,460 $177.78 $2,133.30
Elim Church &Parsonage 12,600 151,200 $141.00 $1,692.00
Community Center 5,490 65,880 $105.45 $1,265.40
Warming House 4,266 51,192 $99.33 $1,191.96
Gammelgarden 1,570 18,840 $85.85 $1,030.20
Total 57,285 687,420 $910.43 $10,925.10
*Based on 2010 Water Use
Ciry of Scandia—N11103386 Page 35
Uptown Wastewater System Master Plan Prepared by Bolton &Menk,Inc.
Table 8.5 represents the estimated sewer charges for the Low Base Rate, High Use Rate
option.
Table 8.5
Estimated Sewer Charges
Low Base Rate, High Use Rate Option
Uptown WW System
Base Rate- $13.00/month
Use Rate - $14.00/1000 gal
Avg. Avg.
Monthly Annual Avg.
Water Water Monthly Avg.
Use* Use* Sewer Annual
User (gal) (gal) Bill Sewer Bill
Schmitt Mall 7,513 90,156 $118.18 $1,418.18
Yoga Hus 327 3,924 $17.58 $210.94
R&B Auto 5,564 66,768 $90.90 $1,090.75
Scandia Store/Deli/Cafe 19,955 239,460 $292.37 $3,508.44
Elim Church &Parsonage 12,600 151,200 $189.40 $2,272.80
Community Center 5,490 65,880 $89.86 $1,078.32
Warming House 4,266 51,192 $72.72 $872.69
Gammelgarden 1,570 18,840 $34.98 $419.76
Total 57,285 687,420 $905.99 $10,871.88
*Based on 2010 Water Use
If the proposed improvements discussed in Section 3.6 are implemented the system will
need to support debt service for financing the proposed improvements in addition to
increased O&M costs. Assuming the proposed improvement cost of$112,000 was
financed for a 10-year period at 4% interest, the annual debt service would total $13,809.
Therefore, user rates would need to be increased to cover the additional costs.
City of Scandia—N11.103386 Page 36
Uptown Wastewater System Master Plan Prepared by Bolton &Menk,Inc.
Table 8.6 represents the estimated sewer charges for the High Base Rate, Low Use Rate
option with the additional debt service cost.
Table 8.6
Estimated Sewer Charges with Proposed Improvements
High Base Rate, Low Use Rate Option
Uptown WW System
Base Rate- $232.00/month
Use Rate - $5.50/1000 gal
Avg. Avg.
Monthly Annual Avg.
Water Water Monthly Avg.
Use* Use* Sewer Annual
User (gal) (gal) Bill Sewer Bill
Schmitt Mall 7,513 90,156 $273.32 $3,279.86
Yoga Hus 327 3,924 $233.80 $2,805.58
R&B Auto 5,564 66,768 $262.60 $3,151.22
Scandia Store/Deli/Cafe 19,955 239,460 $341.75 $4,101.03
Elim Church & Parsonage 12,600 151,200 $301.30 $3,615.60
Community Center 5,490 65,880 $262.20 $3,146.34
Warming House 4,266 51,192 $255.46 $3,065.56
Gammelgarden 1,570 18,840 $240.64 $2,887.62
Total 57,285 687,420 $2,171.07 $26,052.81
*Based on 2010 Water Use
Ciry of Scandia—N11.103386 Page 37
Uptown Wastewater Systeni Master Plan Prepared by Bolton&Menk,Inc.
Table 8.7 represents the estimated sewer charges for the Low Base Rate, High Use Rate
option with the additional debt service cost.
Table 8.7
Estimated Sewer Charges with Proposed Improvements
Low Base Rate, High Use Rate Option
Uptown WW System
Base Rate- $15.00/month
Use Rate - $33.25/1000 gal
Avg. Avg.
Monthly Annual Avg.
Water Water Monthly Avg.
Use* Use* Sewer Annual
User (gal) (gal) Bill Sewer Bill
Schmitt Mall 7,513 90,156 $285.47 $3,425.62
Yoga Hus 327 3,924 $26.77 $321.26
R&B Auto 5,564 66,768 $215.30 $2,583.65
Scandia Store/Deli/Cafe 19,955 239,460 $733.38 $8,800.56
Elim Church & Parsonage 12,600 151,200 $468.60 $5,623.20
Community Center 5,490 65,880 $212.64 $2,551.68
Warming House 4,266 51,192 $168.58 $2,022.91
Gammelgarden 1,570 18,840 $71.52 $858.24
Total 57,285 687,420 $2,182.26 $26,187.12
*Based on 2010 Water Use
Ciry of Scandia—N11.103386 Page 38
Uptown Wastewater System Master Plan Prepared by Bolton &Menk,Inc.
9.0 DISCHARGE ORDINANCE RECOMMENDATIONS
9.1 General
It is recommended that the City establish an updated Wastewater Discharge Ordinance
applicable to the Uptown Wastewater System. This section will make recommendations
on the content of the updated ordinance. Ordinances for similar systems in Scott County
as well as the City of Scandia were used as a guideline for the recommendations.
9.2 Recommendations
It is recommended that the updated discharge ordinance should contain the following
elements:
• Description of the purpose and intent of the ordinance
• Location and general description of the wastewater system
• Definitions of terms used in the ordinance
� Reference to or adoption of applicable laws, rules, standards, or ordinances of
other governing bodies or agencies that apply to the system (e.g. Washington
County Ordinance, MPCA rules, etc.)
• Specific description of the various elements of the system defining what parts of
the system are under public ownership and which parts of the system are under
private ownership
• Description of responsibilities of the City and responsibilities of the Users of the
system (e.g. maintenance, problem reporting, meter reading)
• Establishment of the rate system, calculation of user charges, as well as procedure
and frequency for adjustment of rates
• Establishment of the method and frequency of billing
• Procedure for dealing with delinquent accounts
• Restriction of new connections to the system
• Restrictions on flow rates for each existing connection to the system (purpose is
to give the City some control when a high water use business replaces an existing
low water use business and creates the potential for the design flow of the system
to be exceeded)
Ciry of Scandia-N11.103386 Page 39
Uptown Wastewater System Master Plan Prepared by Bolton &Menk,Inc.
• Establishment of prohibited discharges to the system (e.g. hazardous materials,
non sewage materials, etc.)
• Prohibition of damage to the system (in the form of excessive flow, physical
damage, discharge of prohibited materials, etc.)
• Establishment of a procedure for enforcement of and penalization for violations of
the ordinance
• Provision allowing the City to recoup costs incurred in investigating and
prosecuting violations
• Provision allowing the City the right to amend or change the ordinance
City of Scandia—N11.103386 Page 40
Uptown Wastewater System Master Plan Prepared by Bolton &Menk,Inc.
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