09. Carnelian Marine - Goers - Scandia MOU for Installation & Maintenance of a Raingarden Staff Report
Date of Meeting: May 1, 2024
For: Honorable Mayor and Council
From: Kyle Morell, City Administrator
Subject: Carnelian Marine St. Croix Watershed – Goers – Scandia MOU for the
Installation and Maintenance of a Raingarden
Background:
The residents of 12730 182nd St N (Owners) are working with the Carnelian Marine St. Croix
Watershed (Watershed) to install a rain garden on City property. The Owners and the CMSCWD will
pay for the project and conduct all maintenance. The City agrees to allow the Owners and the
Watershed to access its property to install and maintain a raingarden.
The MOU and a schematic of the proposed raingarden are attached. Discussions about the project
began in 2022 with the former Administrator. The raingarden will capture runoff from the Owners
property and the City road currently running into the lake untreated.
Financial Impact:
The city will not experience a financial impact. The Owners and the Watershed will fund the project
and conduct all required maintenance.
Options:
1) Approve MOU for the Installation of a Raingarden
2) Deny MOU
3) Table for further discussions
Recommendation:
Option 1
Attachments:
MOU between CMSCWD – Goers – Scandia for Installation of a Raingarden
MEMORANDUM OF UNDERSTANDING
Between
CARNELIAN-MARINE-ST. CROIX WATERSHED CMSCWD
And
PETER DAVID GOERS AND KARISSA GOERS
And
CITY OF SCANDIA
For the
INSTALLATION AND MAINTENANCE OF RAINGARDEN AND ROAD TRENCH AT
12730 182ND STREET NORTH, SCANDIA, MINNESOTA
ARTICLE I
Background, Introduction, and Purpose
1. Peter David Goers and Karissa Goers (“Owners”) are the owners of property located at
12730 182nd Street North, Scandia, Minnesota, with the following legal description:
See attached “Exhibit A”
(“Property”).
2. The Carnelian-Marine-St. Croix Watershed CMSCWD (“CMSCWD”) and Owners
intend to install a raingarden on Property and road trench within the drainage area of
182nd Street North, Scandia detailed in Exhibit B, hereinafter referred to as the “Project,”
which is attached hereto and incorporated by this reference. Said Project is partially
located on property owned by the City of Scandia (“CITY”) and within Scandia right-of-
way (collectively, the “City Property”). CMSCWD, Owners, and the CITY may be
referred to in this Memorandum of Understanding individually as “Party” or collectively
as the “Parties”.
3. The CITY has indicated acceptance of CMSCWD and Owners’ plan to install the Project
and conduct related monitoring activities on the City Property.
4. The Project shall be paid by the CMSCWD and Owners.
5. This Memorandum of Understanding (“MOU”) establishes requirements, procedures, and
processes for guiding the activities and decisions of the CMSCWD, Owners, and the
CITY in matters relating to the Project.
6. All parties recognize that the objectives of this MOU can best be realized through close
coordination and cooperation.
ARTICLE II
Installation of Project
1. CMSCWD and Owners desire to install Project on the City Property for purposes of
treating stormwater from the 182nd Street North into a raingarden, thereby reducing
phosphorus and sediment in runoff from 182nd Street North to Big Marine Lake.
2. CITY agrees to allow CMSCWD, Owners, and their agents to access the City Property
depicted on the attached plans for purposes of installing and maintaining the Project at
reasonable times. CMSCWD and/or Owners shall provide CITY reasonable notice before
accessing the City Property for any reason related to the Project. Upon such notice, CITY
agrees to communicate with CMSCWD and/or Owners if there are planned activities at
the time of Project installation or monitoring in an effort to minimize interference with
the CMSCWD’s activities under this Agreement. CMSCWD and Owners shall install the
Project in a manner that will not obstruct or interfere with the use of the public right-of-
way, including drainage and right-of-way use by other utility providers, including the
CITY. CITY does not and cannot guarantee or warrant that access to the City Property
will not be obstructed at the time of Project installation or monitoring by CMSCWD
and/or Owners due to other permitted right-of-way uses that may be happening on the
City Property, including various construction activities by the CITY and its contractors.
CMSCWD and Owners acknowledge that the CITY and its right of way users may enter
the City Property at any time to conduct any activities in the discretion of the CITY.
3. CMSCWD will provide project management services to complete the any portion of the
Project that occurs on City Property. Owners will provide project management services to
complete any portion of the Project that occurs on Property.
4. CMSCWD shall ensure that any contractor installing the Project or performing any work
on the City Property maintains commercial general liability insurance that has a policy
limit of at least $1,500,000. The contractor shall list and provide a certificate of insurance
to CMSCWD and the CITY listing each as additional insured.
ARTICLE III
Payment of Project
5. CMSCWD and Owners agree to be responsible for all plan development of the Project.
6. Owners agree to be responsible for payment of the construction pursuant to Minnesota
law requirements.
7. CMSCWD will complete all compliance reporting and record retention following State of
Minnesota requirements.
ARTICLE IV
Maintenance of Raingarden
8. The Owners will maintain the raingarden pursuant to that Declaration for Maintenance of
Stormwater Facilities, a copy of which is attached hereto as Exhibit C, and incorporated
by reference (“Declaration”).
9. Owners responsibility to maintain the raingarden shall be perpetual, per the terms of the
Declaration, and this responsibility shall extend beyond the expiration date of this
Agreement.
ARTICLE V
Maintenance of City Property
10. CMSCWD shall be responsible for maintenance for any portion of the raingarden
located on City Property.
11. Maintenance shall consist of: in the “BWSR Native Vegetation Establishment and
Enhancement Guidelines (January 2019 edition)” shall include (1) annual removal of
accumulated sediment, trash, leaves, and debris in water quality practices proper and in
the pretreatment collection areas, (2) annual eradication of noxious weeds and invasive
species, (3) installation of supplemental native vegetation, as needed, if barren areas form
or if control of noxious or invasive species control exceeds 25% of the Project area, (4)
repair of any areas of erosion, as needed, (5) inspection and removal of debris at inlet and
outlet structures to ensure flow is not impeded.
ARTICLE VI
Maintenance Provisions applicable to all Parties
12. All maintenance required to be performed by this MOU by the Parties shall be performed
in a manner which shall be at the sole discretion of the party so obligated.
13. Any Party performing maintenance pursuant to this MOU shall be responsible for payment
of said maintenance, including payment to any contractors and/or subcontractors, pursuant
to Minnesota Statute Section 471.425.
ARTICLE V
Indemnification
14. CMSCWD shall defend, indemnify, and hold harmless the CITY, its officials, agents,
contractors, and employees, from and against all suits, demands, causes of action,
liabilities, or claims for injury or damages of whatever nature, including personal injury,
death, or damage to property, arising out of, or related to CMSCWD’s use of the City
Property for the Project, or pursuant to CMSCWD’s obligations as outlined in this MOU,
unless caused by the negligence or intentional acts or omissions of the CITY, its agents,
officials, employees, and assigns in relation to the Project.
15. CMSCWD shall defend, indemnify, and hold harmless the Owners, its agents, and
contractors, from and against all suits, demands, causes of action, liabilities, or claims for
injury or damages of whatever nature, including personal injury, death, or damage to
property, arising out of, or related to CMSCWD’s obligations to Owners as outlined in
this MOU, unless caused by the negligence or intentional acts or omissions of the
Owners, its agents, officials, and assigns in relation to the Project.
16. The CITY agrees that it will defend, indemnify and hold harmless the CMSCWD against
any and all liability, loss, damages, costs and expenses which the CMSCWD may hereafter
sustain, incur or be required to pay by reason of any negligent act by the CITY, its agents,
officers or employees during the performance of this MOU.
17. The CITY agrees that it will defend, indemnify and hold harmless the Owners against
any and all liability, loss, damages, costs and expenses which the Owners may hereafter
sustain, incur or be required to pay by reason of any negligent act by the CITY, its agents,
officers or employees during the performance of this MOU.
18. The Owners agree that they will defend, indemnify and hold harmless the CMSCWD
and/or the CITY against any and all liability, loss, damages, costs and expenses which the
CMSCWD and/or the CITY may hereafter sustain, incur or be required to pay by reason
of any negligent act by the Owners, their agents, heirs, assigns, or contractors during the
performance of this MOU.
19. To the fullest extent permitted by law, actions by CMSCWD and City as the parties to
this MOU are intended to be and shall be construed as a “cooperative activity” and it is
the intent of the parties that they shall be deemed a “single governmental unit” for the
purposes of liability, as set forth in Minnesota Statutes, Section 471.59, subd. 1a(b). The
parties to this MOU are not liable for the acts or omissions of another party to this MOU
except to the extent they have agreed in writing to be responsible for the acts or
omissions of the other parties as provided for in Section 471.59, subd. 1a.
20. Each party’s liability shall be governed by the provisions of Minnesota Statutes, Chapter
466 and other applicable law. The parties agree that liability under this MOU is controlled
by Minnesota Statute 471.59, subdivision 1a and that the total liability for the parties shall not
exceed the limits on governmental liability for a single unit of government as specified in
466.04, subdivision 1(a).
ARTICLE VI
Miscellaneous Terms
21. This MOU is effective when fully executed and will remain effective for 10 years from
completion of the Project, or until June 1, 2034, whichever date occurs first.
22. The parties’ respective funding contribution amounts and any other roles or responsibilities
under this MOU may be modified only by written agreement signed by all parties hereto.
23. This MOU may be terminated by written agreement signed by all of the parties. This
MOU may also be terminated if any party fails to fulfill any of its roles or responsibilities
under this MOU or modifications to this MOU. Provided that, if this MOU is terminated
for any reason, the parties shall pay their portion of accrued allowable expenses.
24. The provisions of Minn. Stat. 181.59 and of any applicable ordinance relating to civil rights
and discrimination shall be considered part of this Agreement as if fully set further herein
and shall be part of any Agreement entered into by the parties with any contractor,
subcontractor, or material suppliers.
25. The parties to this Agreement acknowledge that they have had an opportunity to have the
terms of this Agreement reviewed by legal counsel of their choice. All attorney fees
incurred shall be at the expense of the party that obtained those services.
26. This Agreement may be executed in one or more counterparts, each of which shall be
deemed an original, and all of which taken together shall constitute one and the same
instrument.
27. This MOU represents the entire agreement between the CITY, CMSCWD, and Owners
regarding the matters provided herein and supersedes any prior oral or written agreements
regarding the same.
This MOU shall be effective immediately upon signature of the City of Scandia, Owners, and the
CMSCWD and shall remain in effect until all Project are removed, the MOU is terminated by in
accordance with paragraph 21, or the MOU is mutually terminated by both parties.
[REMAINDER OF PAGE INTENTIONALLY BLANK]
CITY OF SCANDIA
By: Date:
Its Mayor
By: Date:
Its CITY Clerk
APPROVED AS TO FORM:
Date:
CITY Attorney, City of Scandia
CARNELIAN-MARINE-ST. CROIX WATERSHED CMSCWD
By: Date:
Its President
By: Date:
Its Secretary
APPROVED AS TO FORM
Attorney for Carnelian-Marine-St. Croix Watershed CMSCWD
OWNERS
By: Date:
Peter David Goers
By: Date:
Karissa Goers
KEY TO FEATURES
!I
Pete Goers12730 182nd Street N,Scandia, MN 55047
944
942
9 4 0
946
948
9
5
0
952
9
5
4
956
958
960
964
962
960
9 4 2944
958
964
962
0 10 20 30 40 505Feet
1 in = 30 ft 2022 Aerial Photo
Document Path: P:\Projects\Watersheds\CMSCWD\CMSCWD_BMP_Projects\Goers, Pete\DESIGN\GIS\Goers Aerial.mxd
Legend
2 ft Contours (LiDAR)
DNR Public Waters
Parcels
+942.1 943'
Landscape Plan
Scale: 1" = 20'-0"1
Project Manager
Date
CAD File Name
L-1
Lori Tella
6.01.23
Goers_Raingarden Concept 6.01.23 RV2.vwx
7
of
Sheet Title
Project Title
CONCEPT PLAN
GOERS RESIDENCE RAIN
GARDEN
12730 182nd Street N,
Scandia, MN 55047
Project Address
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 LANDSCAPE ARCHITECT UNDER THE LAWS
OF THE STATE OF MINNESOTA.
Lori Tella
Reg. No.
Date
Concept
58219
Washington
Conservation District
Revision
Reviewed
Drawn
Prepared For:
ROOF AREA
TREATED: 506 FT2
RAINGARDEN
LOCATION
DRAINAGE AREA = 0.1 AC
CITY PROPERTY
-- CITY ROAD = 837 FT2
GOERS PROPERTY
-- ROOF = 506 FT2
-- DRIVEWAY = 1,323 FT2
-- PATH = 350 FT2
-- LANDSCAPE = 1,616 FT2
3,016 (.069 AC) TOTAL IMPERVIOUS, 1,616 SF (.037 AC) PERVIOUS
TOTAL DRAINAGE AREA~ 4,632 FT2 (.1 AC)
*80/20 SPLIT (GOERS/CITY)
•• Raingarden Required Treatment = 448 Cubic Feet
RAINGARDEN PERFORMANCE
-- RAIN GARDEN 450 FT2
-- BASIN 150 FT2
-- 1.5' DEPTH MAX
-- 3:1 MAX SIDE SLOPES
REQUIRED TREATMENT VOLUME 448 CF
PROVIDED TREATMENT VOLUME 448 CF [99% RETAINED]
ANNUAL POLLUTANT LOAD REDUCTIONS
--TP REMOVED: 0.13 LBS [99% RETAINED]
--TSS REMOVED: 24 LBS [99% RETAINED]
--VOLUME: 0.15 ACRE-FT [99% RETAINED]
DRIVEWAY
TREATED: 1,323 FT2
LANDSCAPE
TREATED: 1,616 FT2
ROAD
TREATED: 837 FT2
PATH:
350 FT2
BIG MARINE LAKE
PROPERTY LINE
0 2010
Feet N
5 30 40
BIG MARINE
BERM: 3H:1V
MAX SLOPE
SPEED BUMP
[SEE L-5]
1' BOULDER
RETAINING WALL
PROPOSED RAIN
GARDEN 450 FT2
[SEE L-3]
Project Manager
Date
CAD File Name
L-2
Lori Tella
6.01.23
Goers_Raingarden Concept 6.01.23 RV2.vwx
7
of
Sheet Title
Project Title
LAYOUT PLAN
GOERS RESIDENCE RAIN
GARDEN
12730 182nd Street N,
Scandia, MN 55047
Project Address
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 LANDSCAPE ARCHITECT UNDER THE LAWS
OF THE STATE OF MINNESOTA.
Lori Tella
Reg. No.
Date
Concept
58219
Washington
Conservation District
Revision
Reviewed
Drawn
Prepared For:
+
0
00
+
0
34.59
+
0
0
0
+
0
4
7
+HP 944.4
+944.16 [inlet]
943
TOW 946+
945'
+HP 944.2
9
4
4
9
4
5
9
4
3
9
4
6
HP 944.5 +
945'
944
+LP 943.9
HP 944.5 ++HP 944.5
944'
+LP 952.8
+9 45 B O W
+94 5 .5
INL ET
Layout Plan
Scale: 1/8" = 1'-0"1
6'
PROPOSED RAIN GARDEN
SPEED BUMP
CONNECT DOWNSPOUT TO
RAIN GARDEN VIA PIPE AND
ADD DRAIN ROCK AT INLET
General Notes
1.
2.
3.
4.
5.
UTILITIES MUST BE CLEARLY MARKED PRIOR TO
CONSTRUCTION.
BASE INFORMATION INCLUDING EXISTING CONTOURS,
LOCATION OF PROPERTY LINES, BUILDINGS, DRIVEWAYS
AND WALLS HAVE BEEN REFERENCED FROM OTHERS. ALL
GARDEN SIZES SHOWN ARE APPROXIMATE.
BEFORE INSTALLING PLANT MATERIALS CONTRACTOR
SHALL VERIFY THE RAIN GARDEN INFILTRATION RATE IS 2"
PER HOUR OR GREATER. AMEND SOILS UNTIL THE
SPECIFIED RATE IS ACHIEVED.
PRESERVE ALL EXISTING VEGETATION UNLESS REMOVAL
IS DULY NOTED WITHIN PLAN OR APPROVED BY OWNER'S
REPRESENTATIVE. REPAIR AREAS DAMAGED BY
CONSTRUCTION.
BOULDER RETAINING WALL SHALL FOLLOW EXISTING
GRADE OF SLOPE. CONTRUCT RAIN GARDEN BASIN AND
BERM AS NEEDED TO ALLOW FOR A 3H:1V MAX SLOPE.
BOULDER
RETAINING WALL
[12" HEIGHT]
BERM W/ OVERFLOW
[3H:1V MAX]
0 84
Feet N
2 12 16
SECTION A-A'1
L-4
1
L-5
BIG MARINE LAKE
Plant Schedule
Image ID Qty Botanical Name Common Name Size
ARCA 15 Anemone canadensis Canada Anemone Plug
BAAU 5 Baptisia australis Blue False Indigo Plug
CABE 56 Carex bebbii Bebb’s Sedge Plug
COLA 23 Coreopsis lanceolata Lanceleaf Coreopsis Plug
DlLO 3 Diervilla lonicera Dwarf Bush Honeysuckle #1 cont.
FRVI 16 Fragaria virginiana Wild Strawberry Plug
NEFA 8 Nepeta x faasenii 'Walker's Low'Walker's Low Catmint Plug
PAVI 17 Panicum virgatum Switch Grass Plug
SPHE 20 Sporobolus heterolepis Prairie Dropseed Plug
Project Manager
Date
CAD File Name
L-3
Lori Tella
6.01.23
Goers_Raingarden Concept 6.01.23 RV2.vwx
7
of
Sheet Title
Project Title
PLANTING PLAN
GOERS RESIDENCE RAIN
GARDEN
12730 182nd Street N,
Scandia, MN 55047
Project Address
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 LANDSCAPE ARCHITECT UNDER THE LAWS
OF THE STATE OF MINNESOTA.
Lori Tella
Reg. No.
Date
Concept
58219
Washington
Conservation District
Revision
Reviewed
Drawn
Prepared For:
5-BAAU
3-DlLO
20-SPHE
56-CABE
17-PAVI
16-FRVI
8-NEFA
15-ARCA
23-COLA
Planting Plan
Scale: 1/8" = 1'-0"1
ROCK AT PIPE INLET
BIG MARINE LAKE
BERM
SOD
[REPAIR AS NEEDED]
0 84
Feet N
2 12 16
OVERFLOW
Project Manager
Date
CAD File Name
L-4
Lori Tella
6.01.23
Goers_Raingarden Concept 6.01.23 RV2.vwx
7
of
Sheet Title
Project Title
RAIN GARDEN DETAIL
GOERS RESIDENCE RAIN
GARDEN
12730 182nd Street N,
Scandia, MN 55047
Project Address
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 LANDSCAPE ARCHITECT UNDER THE LAWS
OF THE STATE OF MINNESOTA.
Lori Tella
Reg. No.
Date
Concept
58219
Washington
Conservation District
Revision
Reviewed
Drawn
Prepared For:
946
945
9"-12" PONDING DEPTH
UNDISTURBED SOILS
RIPPED SOILS
1'-0" AMENDED SOILS
14'
RAIN GARDEN WIDTH VARIES
[14' -18']
DISTANCE TO PATIO VARIES
[6' -10']
GRAVEL ROAD3H:1V SLOPE 3H:1V SLOPE
EXISTING GRADE
Rain Garden Section Detail
Scale: 1/2" = 1'-0"1
1'
General Notes
1.
2.
3.
DETAIL IS INTENDED FOR GUIDANCE PURPOSES ONLY;
VERIFY ALL GRADES PRIOR TO BEGINNING CONSTRUCTION,
ADDITIONAL PERMITS MAY BE REQUIRED BEYOND DISTRICT
PERMIT. PERMITTEE SHALL BE RESPONSIBLE FOR AND
ACQUIRE ANY ADDITIONAL REQUIRED PERMITS.
FULL EXCAVATION AND SOIL MEDIA IMPORT NOT
PERMITTED UNTIL IMPERVIOUS AREA CONSTRUCTION IS
COMPLETE WITHIN CONTRIBUTING DRAINAGE AREA AND
PERVIOUS AREAS ARE SUBSTANTIALLY STABLE.
IF REQUIRED TO ACHIEVE A 2"/ HR INFILTRATION RATE,
AMENDED SOIL SHALL CONSIST OF A BLEND OF 70% CLEAN
WASHED SAND/ 30% PEAT OR EQUAL.
RAIN GARDEN BIOMEDIA [IF
NEEDED TO MEET 2"/ HR
INFILTRATION RATE, SEE
SPECIFICATIONS]
RAISED BERM 6" MAX,
MATCH EXISTING GRADE
12" MIN FIELDSTONE
BOULDER WALL, BACKFILLED
WITH CRUSHED ROCK
940
950
946
945
944
943 943
944
+944.5
SECTION A-A'
Scale: 1/4" = 1'-0"2
2-3" LAYER OF BARK MULCH,
SEE SPECIFICATIONS]
Project Manager
Date
CAD File Name
L-5
Lori Tella
6.01.23
Goers_Raingarden Concept 6.01.23 RV2.vwx
7
of
Sheet Title
Project Title
SPEED BUMP DETAIL
GOERS RESIDENCE RAIN
GARDEN
12730 182nd Street N,
Scandia, MN 55047
Project Address
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 LANDSCAPE ARCHITECT UNDER THE LAWS
OF THE STATE OF MINNESOTA.
Lori Tella
Reg. No.
Date
Concept
58219
Washington
Conservation District
Revision
Reviewed
Drawn
Prepared For:
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Contractor will determine in the bid documents whether they prefer to install a bituminous speed bump meeting the design below or to install a prefabricated speedbump.
If a prefabricated option is chosen, Contractor will provide WCD designer proposed product, product spec, and schematic of proposed speed bump system to WCD Designer for
approval. Prefabricated option will also need to be keyed into the existing bituminous to keep water flows from getting beneath the speedbump and bypassing the proposed
drainage systems.
Speedbump - Typical
Scale: 1 1/2" = 1'-0"1
Bituminous Speedbump
Asphalt mix as appropriate per
MNDOT 2360 and 3151
Key in speed bump at
least 1" depth
Existing Bituminous
Existing Class 5 Base
and/or Native Soils
3
"
m
a
x
1
"
2'
Project Manager
Date
CAD File Name
L-6
Lori Tella
6.01.23
Goers_Raingarden Concept 6.01.23 RV2.vwx
7
of
Sheet Title
Project Title
SPECIFICATIONS
GOERS RESIDENCE RAIN
GARDEN
12730 182nd Street N,
Scandia, MN 55047
Project Address
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 LANDSCAPE ARCHITECT UNDER THE LAWS
OF THE STATE OF MINNESOTA.
Lori Tella
Reg. No.
Date
Concept
58219
Washington
Conservation District
Revision
Reviewed
Drawn
Prepared For:
WCD BIORETENTION DESIGN AND INSTALLATION STANDARDS
(continued)
BLOCK INLET - After installation, garden shall remain offline and inlet shall remain
blocked for up to one year to facilitate healthy plant establishment. Confirm with WCD
designer to determine the date that the inlet blocks shall be removed.
MULCH - Shredded hardwood mulch (Type 6 MNDOT 3882)
EROSION CONTROL BLANKET - When specified in plans, slopes shall be stabilized
per MNDOT spec and use MNDOT Cat. 2 Natural Net Erosion Control Blanket. Net
must be biodegradable
WALL STONE - Fieldstone boulders used for retaining wall shall be no less than 12
inches in diameter.
EROSION AND SEDIMENT CONTROL
EROSION CONTROL REQUIREMENTS - Contractor is responsible for all on-site
implementation of erosion and sediment controls in compliance with the requirements of
the State of Minnesota NPDES/SDS Construction Stormwater General Permit.
TEMPORARY STABILIZATION - Stabilization of all exposed soils must be initiated
immediately whenever construction has permanently or temporarily ceased for 7
calendar days, including stockpiles; per MNDOT Spec.
TEMPORARY STABILIZATION - Use MNDOT approved Cat. 2 Curlex Natural Fiber
Net Erosion Control Blanket
SEEDING/PLANTING/WATERING
SEED BED PREPARATION - must be completed in compliance with MnDOT 2574.
Contractor must prepare the soil surface to provide a smooth, moist, and evenly
textured foundation before sowing seed. Use cultivating equipment such as disks,
harrows, field diggers, or tillers capable of loosening the soil to a depth of at least 3” on
all areas except for slopes steeper than 1:2 (V:H). Till the soil surface to remove track
imprints from wheeled or tracked equipment. Operate cultivating equipment on slopes
at right angles to the direction of surface drainage. Soil clods, lumps, and tillage ridges
3”high may remain in place for seeding operations.
PLANT BED PREPARATION - must be completed in compliance with MnDOT 2574.
Contractor must scarify existing soil at basin bottom of the raingarden to break
compaction and allow fro effective infiltration of water. The Conractor must prepare the
soil surface to provide a smooth, moist, and evenly textured foundation before planting.
All plant material must be completely buried in growing media to the base of the plant
as it sits in the nursery container. Roots of each plant should be surrounded by soil, not
mulch.
INSTALL MAINTENANCE - Contractor is responsible to maintain and repair all areas
for a minimum of 30days from planting or until acceptance, whichever is later. This
includes provide mowing, watering, and weeding throughout maintenance period to
ensure healthy, growing turf. Weed seeded areas by hand pulling or spot spraying with
a contact herbicide only. Replace areas that are found to be dead, unhealthy, or not
achieving normal growth. If maintenance responsibility is transferred to property
owners, WCD designer must approve of transfer before any maintenance activity
occurs.
WATERING - Contractor is responsible for the following minimum watering standards:
1. Apply water as needed in combination with rainfall to achieve the following: a.
Minimum rate: 1 inch per week. b. Maximum interval between watering: 72 hours. c.
Minimum application per watering: 0.25 inch. 2. During extreme heat or drought periods,
increase watering to maintain moist soil to a depth of 4 inches. 3. Maintain adequate
soil moisture in the upper 12-inches for 3 weeks after sodding, planting or seeding. If
watering responsibility is transferred to property owners, WCD designer must approve
of transfer before watering activity occurs.
GENERAL NOTES
MNDOT SPECIFCATIONS - All material and construction specifications herein
reference the MNDOT Division II and Division III sections of the 2018 MNDOT
Specifications Manual.
WCD DESIGN STANDARDS - All work must comply with Washington Conservation
Bioretention Design and Installation Standards where noted.
DESIGNER CONTACT / FIELD VERFICATION - The Washington Conservation
District (WCD) is providing quality control and field verifications of the bioretention
installations. Call Lori Tella (WCD) at (651) 315-8964 to schedule field verifications
prior to burying any work and/or installing any concrete, mulch, or erosion control
materials.
FIELD VERFICATION - Notify the WCD prior to placing any mulch or installing any
plantings. The WCD shall field verify elevations, soil compaction and permeability.
Note: Depending on conditions observed, compaction removal by hand may be needed
prior to placing mulch and/or after plantings.
TESTING OF SOIL REPLACEMENT MEDIA - If infiltration rate is not 2" per hour, soil
amendment may be required. Deliver sample materials and test results for WCD
approval prior to delivery of materials to the site. If needed, soil media for infiltration
basin shall be Plaisted's 70-30 Raingarden Peat Mix, or approved equal. Soil media
test results must be submitted to WCD at least 14 days prior to material delivery. Test
results must include grain size analysis (sand, silt, clay), pH, organic content,
Bray phosphorus test. Prior to beginning the installation, sufficient material
quantities shall be onsite to complete the installation and stabilize exposed soil areas.
PERMITS - Contractor is responsible for all permits related to construction.
UTILITIES - It shall be contractor's responsibility to locate any existing utilities located
within the project areas. Protect all existing utilities. Contractor is responsible for
repairs of all damage that may occur to utilities during construction.
SITE CLEANUP - On completion of the work, remove all excess material, debris, and
equipment. Repair all damage to other work resulting from conduct of the Project.
ACCESS, STAGING, AND EQUIPMENT
PROJECT BOUNDARIES - The project area must be staked off and marked to keep
all construction traffic, equipment, and material stockpiles out of the proposed
infiltration basin area.
STORAGE OF EQUIPMENT - Overnight storage of equipment and materials shall not
be allowed on public streets or within public right of ways. See Staging Area Map for
location. Contractor is responsible for identifying and securing rights to stage vehicles,
materials and equipment for the Project, as necessary, outside of approved Staging
Area.
NOISE DISTURBANCE - Noise must be kept to a minimum prior to 8am
SITE RESTORATION (street and hardscape) - Contractor is responsible for replacing
all sod at access points as well as repairing/replacing any other damage as result of
construction activity. Contractor is responsible for repairing or replacing damaged
bituminous and concrete surfaces in and around the construction, access, and staging
zones.
SITE RESTORATION (vegetation) - Contractor shall repair damaged turf and open
field areas within Project area and any Staging areas. Repair of these areas (MNDOT
Spec 2574) shall be top dressed with topsoil (borrowed soil MNDOT Spec 3877 or
purchased compost MNDOT Spec 3890) and seeded with MNDOT seed mixture 270.
TREE PROTECTION AND REPLACEMENT - Protection and care for existing trees,
and replacement of damaged existing trees shall be per MNDOT Spec 2572.
WCD BIORETENTION DESIGN AND INSTALLATION STANDARDS
FIELD VERFICATION - The Washington Conservation District (WCD) is providing quality
control and field verifications of the infiltration basin installation. Call the WCD at (651)
330-8220 to schedule field verifications prior to burying any work and/or installing any
concrete, seed, mulch, or erosion control materials.
DIVERSION OF DRAINAGE AREA - Upland drainage areas shall remain diverted from
infiltration basin area until the infiltration basin has been fully stabilized.
TIMING AND WEATHER - Installation with dry soil conditions is critical to prevent smearing
and compaction. Schedule work for periods of dry weather. Do not work if soil conditions
are wet. Excavation, soil placement and rapid stabilization of perimeter slopes with must
be completed before the next precipitation event.
UTILITY MOVEMENT - Existing Gas and Electric lines shall be moved to allow for full
garden footprint and subgrade depth. It shall be the contractor's responsibility to verfify
location of all utilities. All utilities must be marked before excavation. If utility line must be
located, hand dig 2' on either side of marked location to locate.
OVERNIGHT EROSION CONTROL - Do not leave infiltration areas and/or perimeter slopes
exposed overnight. Secure the site from risk of precipitation damages at the end of every
work day. In the event of rain, take action to divert stormwater away from the work area
and temporarily cover of all exposed soils with filter fabric or impermeable sheeting.
PONDING DEPTH - Basin Full elevation (the designed ponding depth) shall be measured
from downhill flowline at curb cut. See curb cut and inlet details.
SOIL REPLACEMENT MEDIA - The replacement soil media shall be a well-blended
mixture of 70% ASTM C-33 coarse washed sand (MNDOT 3126) and 30% peat from
Plaisted's (or approved equal).
SUBSOIL PREPARATION - Use backhoe with tooth bucket for basin excavation to avoid
compacting or smearing of soils. (Do not use skid steer for excavation within the basin)
Use tooth bucket to scarify (rip) underlying soils 6" to 9" deep to remove compaction. Gently
mix the first lift of engineered soils with the loosened underlying soils to avoid stratification
and promote permeability. Use excavator bucket to loosely place materials. (Do not use
skid steer to place or spread materials within the cell). Leveling and final grading within the
cell must be completed by hand.
GATEVALVE - See Detail Sheet [option]
PIPE CONNECTIONS - Cleanout assemblies and solid pipe connections shall be 4"
diameter Sch. 40 PVC pipe or equal. All connections will be made with flexible couplings,
and filtersocks will be tucked into the coupling connections.
INSTALL CHECKPOINT - Notify the WCD prior to placing any seed, erosion control
blanket, and/or plants as applicable to the project. The WCD shall field check elevations,
soil compaction and permeability. Note: Depending on conditions observed, compaction
removal by hand may be needed prior to seeding.
SIDESLOPE GRADING - All side slopes to bottom of garden shall be 3:1 or shallower
unless approved by WCD..
BERM / EDGE GRADING - All basin edges at least 3" higher than overflow bypass/basin
full elevation
GRADING SHELF - Basin edges should have a minimum 12" level shelf where practical.
Shelf area tyipcally extends from landscape edging to brow/top of slope.
EDGING - Aluminum or steel edging shall be used and shall be staked/stapled every 30".
[option]
Project Manager
Date
CAD File Name
L-7
Lori Tella
6.01.23
Goers_Raingarden Concept 6.01.23 RV2.vwx
7
of
Sheet Title
Project Title
QUANTITIES
GOERS RESIDENCE RAIN
GARDEN
12730 182nd Street N,
Scandia, MN 55047
Project Address
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 LANDSCAPE ARCHITECT UNDER THE LAWS
OF THE STATE OF MINNESOTA.
Lori Tella
Reg. No.
Date
Concept
58219
Washington
Conservation District
Revision
Reviewed
Drawn
Prepared For:
Material/ Item
Mobilization
Excavation
Site Prep/ Sod Disposal
Labor - Rain Garden Soil Bed Preparation
Labor - Boulder Wall Installation
Labor - Berms
Bituminous Speed Bump
Drain Pipe
Erosion Control Blanket [8' x 45']
Boulder Wall [24"- 30" boulders], 30 LF
Clean-washed Gravel Aggregate
Soil Amendment (70% Sand, 30% Sphagnum Peat; Plaisted's Mix or equal)
Mulch Type #6
Shrubs #1 cont.
Plugs
Sod [approximate, repair as needed]
Qty
1
1
1
1
1
1
12
15
2
2.5
2
5
4
3
160
200
Unit
job
job
job
job
job
job
lf
lf
rolls
tons
cy
cy
cy
each
each
sf
Estimated Quantities