9.a Tiller Mine 2020-01-28 AOP Revised ApplicationSunde Engineering, PLLC.
10830 Nesbitt Avenue South • Bloomington, Minnesota 55437-3100
Phone: (952) 881-3344 • Fax: (952) 881-1913 • E-Mail: info@sundecivil.com
January 2020
APPLICATION FOR
2020 ANNUAL OPERATORS PERMIT
Scandia, MN
Consulting Civil Engineers
Tiller Corporation Page 1
2020 Annual Operators Permit Application
January 2020
APPLICATION FOR ANNUAL OPERATORS PERMIT
TILLER CORPORATION
SAND AND GRAVEL MINING OPERATION
CITY OF SCANDIA
WASHINGTON COUNTY, MINNESOTA
January 2020
I. INTRODUCTION
The following Annual Operators Permit (AOP) application is submitted on behalf of Tiller
Corporation (Tiller) in compliance with the City of Scandia’s Ordinance No. 103 and Chapter
4 of the Development Code: Mining and Related Activities Regulations, Section 6, adopted by
the City of Scandia on August 28, 2007.
Tiller and its operating divisions, Barton Sand & Gravel Co. and Commercial Asphalt Co.
operates a gravel mining and processing operation including an asphalt plant within the City
of Scandia. The site has been actively mined since at least 1966. Prior to the incorporation of
Scandia in 2006, New Scandia Township and Washington County were the permitting
authorities. The City of Scandia adopted two resolutions on May 20, 2008 issuing Conditional
Use Permits (CUPs) for the site which is now comprised of the Tiller Mine and Dresel Mine.
II. ANNUAL REPORT
A. Operating Conditions
The site operates in accordance with operating conditions regulated by Section 7 of the
Scandia Ordinance 103.
1. Setbacks: No mining, stockpiling or land disturbance activities, with the exception of
screening and reclamation activities, are proposed to take place within the setback
areas. Minimum setback areas are maintained as follows:
a) 50 feet from an adjoining property line
b) 200 feet from an occupied structure existing on May 20, 2008.
c) 100 feet from any contiguous property subdivided into residential lots of 5 acres
or less
d) 100 feet from any road right-of-way.
2. Fencing: The majority of the site is fenced with 3 strand wire fencing except where
prohibited due to topography, heavy vegetation and wetlands. There are locking
metal gates at all entrances to the site.
3. Hours of operation: The site is operated from 7:00 a.m. to 7:00 p.m. Monday through
Friday except holidays. Extended hours may be required periodically for situations
such as emergencies, accelerated work schedules or weather delays. In accordance
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January 2020
with procedures set forth in Ordinance No. 103, extended hours were requested and
approved in 2019. As part of the request for extended hours, Tiller asked to be
notified if the City received any complaints regarding the extended hours of
operations. Tiller did not receive any notice of complaints from the City or any
members of the public as a result of the extended hours.
Extended hours were approved and utilized to operate the asphalt plant on a
Saturday to accommodate work on a community center project in Chisago Lakes to
minimize interference with the center’s scheduled activities. There were several
additional requests for extended hours placed by customers, but the extended hours
request for the community center project is the only request that Tiller advanced to
the City in 2019.
It should be noted that the frequency of extended hours requests varies from year-
to-year depending on the projects and the weather. For example, in 2018 Tiller
received authorization to work extended hours on 14 different occasions to
accommodate a number of City projects that were ongoing throughout the season.
4. Screening: Screening berms, wooded buffer areas and agricultural fields separate
the mining activity from surrounding properties. A large number of trees have been
planted in the past to screen site activities. Processing and stockpiling operations
are conducted in recessed portions of the site to minimize visibility.
5. Dust control: Major haul roads are hard surfaced, and some roads are covered with
asphalt millings as dust control measures. A water truck is used to water unpaved
portions of the site to control dust. During periods of increased trucking activity,
calcium chloride or other approved dust suppressant is applied to provide additional
dust control. These practices will continue throughout 2020.
6. Noise: All activities are conducted so as to be in accordance with all Federal, State
and City noise standards.
7. Depth of excavation: Depth of excavation will not be lower than 922 feet above mean
sea level (amsl) for the property described in Resolution No. 05-20-08-02, approving
the Conditional Use Permit Application of Dresel Contracting for Sand and Gravel
Mining Processing. On the balance of the property, the depth of excavation below
the water table will not be lower than 865.87 feet amsl.
8. Site clearance: Site clearing activities did not occur during 2019. If clearing activity
occurs, it will occur within the 2020 Potential Mining Areas as depicted on Figure 2,
Site Plan.
9. Appearance/condition: All buildings, plants and equipment at the site are maintained
in a neat condition. Weeds and other unsightly or noxious vegetation are controlled
as necessary to preserve the appearance of the reclaimed areas.
10. Sanitary Facilities: The scale area is served by an individual sewage treatment
system. Portable sanitary facilities are provided in the operating areas as required
by the Mine Safety and Health Administration.
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11. Waste Disposal: Waste generated from the operation is disposed of in accordance
with Federal, State and City requirements.
12. Water Quality Monitoring: A plan for groundwater monitoring has been developed
and approved in conjunction with the monitoring wells placed in 2008 and the CUP
permitting process. Groundwater monitoring was conducted in 2019. Water level
data is summarized on Table 1 and water quality data is summarized on Table 2,
included in the back of this application.
13. Fuel and Chemical Storage: All fuel and chemicals stored on site are stored in
accordance with Federal and State standards. On-site fuel storage consists of a 200-
gallon above-ground storage tank which is located within a steel secondary
containment area and a 1000-gallon above-ground double walled tank located next
to the standby electrical generator. When processing and/or reclamation crews are
present, an additional 1,000-gallon double walled tank is brought to the site and used
to fuel the respective equipment.
All asphalt cement storage tanks are above-ground. These tanks consist of two
40,000 gallon tanks and two 32,000 gallon tanks. There is also a 20,000 gallon
above-ground used oil storage tank. The used oil is utilized as an alternative fuel
supply for the asphalt plant. All tanks containing asphalt cement and used oil are
located within a concrete secondary containment area.
All tanks are registered with MPCA’s Storage Tank Program. MPCA Site ID 51999
is for the asphalt plant and MPCA Site ID 55016 is for the sand and gravel operation.
Small amounts of chemicals utilized by the QM Lab are regulated by Washington
County under United States Environmental Protection Agency (EPA) rules. EPA ID
Number MND 981 953 417 has been issued for the site which is classified as a Very
Small Quantity Generator.
14. Contingency Response Plan: The site operates under a SPCC Plan which is on file
with the City of Scandia.
15. Added Provisions: The operator will comply with other such reasonable
requirements that the City may find necessary to adopt for the protection of health,
safety and welfare and/or prevention of nuisance.
16. Processing: The site operates permanent processing equipment as defined by
Ordinance No. 103 in accordance with all Federal, State and City air and water
quality and noise standards. Processing equipment is screened from view from other
properties and adjacent roads. Portable crushing equipment is placed on the floor of
the facility and setbacks per Ordinance No. 103 are maintained between the
processing equipment and the property lines.
17. Recycling: Recycling activity at the facility meets all applicable standards contained
in Section 7.1 (1) of Ordinance No, 103.
A Solid Waste Storage Facility license that authorizes the storage of unprocessed
concrete, concrete products, and brick and a Recycling Facility license that
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January 2020
authorizes the storage and processing of recycled asphalt products are reissued
annually to Tiller by Washington County. General and Specific Conditions are
established for each license and are reviewed on an annual basis and may include
an annual inspection completed by the County. A copy of the Annual Reports for the
Solid Waste Storage Facility and the Recycling Facility submitted to Washington
County are available upon request.
18. Trucking Operations: The site has access to County Road 15 (Manning Trail N.),
County Road 91 (Lofton Avenue N.) and 218th Street North. These are hard-surfaced
roads.
19. Asphalt Plants: The site operates a permanent asphalt plant and the plant was in
operation at the time the City adopted its mining ordinance. Therefore, the plant may
expand in the future subject to the setbacks set forth in Section 7.1(1) of Ordinance
No. 103. The plant operates in accordance with all Federal, State, and City air, water
and noise quality standards.
B. Compliance with Conditions of the CUP
1. Updated Copy of Application Material: A completed bound book that includes all of
the information and plans submitted to the City during the CUP process was
previously submitted and is on file at the City.
2. Watershed District Permit: The Watershed District Permit, P08-003, was revised in
2019 to align the permit with the City’s annual review process and eliminate a 5-
year term on the permit. The revisions to the permit were approved by District
Managers during their February 13, 2019 Regular Meeting.
3. Monitoring Wells: All required monitoring wells have been installed.
4. Groundwater Monitoring Plan: A monitoring plan with protocols is on file with the
City.
5. Excavation Below Water Table: In 2019, excavation into the groundwater table
occurred to obtain material needed to meet the gradation requirements of the final
products. Excavation into the groundwater table is likely to occur in 2020 based on
availability of equipment. Water level data is collected on an on-going basis and
submitted annually to the City (see Table 1).
6. Production Well Records: Records of the production well are kept. They are
summarized on Table 3.
7. Groundwater Analysis: Groundwater samples were analyzed for DRO as indicated
in the groundwater monitoring plan. Table 2 summarizes the results of the required
groundwater monitoring. DRO was not detected in any of the monitoring wells.
Results have been supplied to the City. Currently, no gasoline is stored on site. If
gasoline is stored on-site in the future, GRO will be added to the analyte list.
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8. MN County Well Index: A figure which illustrates the site and MN County Index wells
is on file at the City.
9. Setback from Proposed Lake: The asphalt plant and related structures will be
setback at least 100 feet from the edge of the water body that will be created as part
of mining operations.
10. Lake Depth: The maximum excavation into the water table will be no more than 50
feet. The depth of excavation in 2019 has been measured at approximately 906 feet
amsl which is well above the maximum excavation elevation of 865.87 established
in previous AOP’s.
11. Truck Hauling Signs: Washington County has posted Lofton and Manning Avenues
per their requirements. Tiller has posted signs on 218th Street per City of Scandia
requirements.
12. Lofton/Hwy 97 Intersection: Tiller Corporation restricts importing add-rock from
Lofton Ave. N. during non-daylight hours as defined in their CUP.
13. 228th Street Sign: Tiller Corporation has posted a sign at the Lofton Ave. N. exit that
restricts trucks from using 228th Street.
14. Reclamation and Sequencing Plan: A Reclamation Plan and Phasing Plan is on-file
with the City. Current reclamation progress is indicated on Figure 2, Site Plan,
submitted with this AOP application.
C. Annual Activity
1. Amount of material removed from the site: Approximately 425,000 tons of material was
removed in 2019.
2. Amount of add-rock brought onto the site: Approximately 60,500 tons of Class A, Class
B, Class C and Class D add-rock were imported to the site in 2019.
3. Area reclaimed and type of reclamation: Reclamation activities in 2019 included
placement of overburden and suitable fill material in the west half of the mining area,
south of the Scandia Mine/Dresel Mine common mining border. The completed and
ongoing reclamation areas are indicated on Figure 2, Site Plan.
Ongoing reclamation activities are anticipated in the southern portion of the Site,
immediately north and west of the common mining border and within the east half of
the mining area, south of the common mining border during 2020. These areas are
shown on Figure 2, Site Plan as 2020 Potential Reclamation Activity. Some of the
areas shown as potential reclamation will also see active mining during 2020. Once
mining is complete, reclamation may advance into these areas during 2020.
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January 2020
4. Average number of trips hauling material to and from the site per day for the season:
The average number of trucks travelling to and from the site per day in 2019 was
approximately 214 trucks per day.
D. Description of operating conditions planned for the coming year:
During the 2020 mining season, the site will continue to operate as it has in the past. The
mining operation includes the removal of overburden, excavation of sand and gravel,
crushing, washing, screening, stockpiling, and recycling of concrete and asphalt products.
Portable crushing, washing and screening plants are brought to the site periodically and
material is excavated, processed, and stockpiled. Asphalt is produced and sold throughout
the construction season and add rock materials are delivered to the site as needed.
The 2020 production schedule anticipates mining and processing during the 2020 mining
season. The exact area of excavation will depend on the required gradation of the end
products. Mining anticipated during 2020 will occur within the 2020 Potential Mining Area
and some of the Potential Reclamation Areas as indicated on Figure 2, Site Plan.
Aerial Photo: Figure 1, Aerial Photo, is attached which includes a September 24, 2019
aerial photo and identifies the Mining Limit, the Tiller Mine property boundary and the
Dresel Mine property boundary.
Site Plan: Figure 2, Site Plan, is attached which illustrates the potential active mining area
in 2020, potential reclamation activity in 2020, the stockpile and processing area,
reclaimed areas and the current limits of excavation into groundwater.
Reclamation: Ongoing reclamation activities are anticipated in the southern portion of the
Site and along the slope north and west of the common mining border during 2020. These
areas are shown on Figure 2, Site Plan as 2020 Potential Reclamation Activity.
Operating Conditions for 2020: The 2020 production schedule anticipates mining and
processing during 2020. Mining will occur within the 2020 Potential Mining Area as
indicated on Figure 2, Site Plan. The exact area of excavation will depend on the required
gradation of the end products.
E. Inspection:
The City conducts an annual inspection of the site. The last inspection occurred on
November 5, 2019.
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2020 Annual Operators Permit Application
January 2020
III. CERTIFICATION
I certify that the plans, specifications or reports for the
above described facility were prepared by me or under my
direct supervision and that I am a duly Registered
Professional Engineer under the laws of the State of
Minnesota.
Kirsten Pauly
Date: January 28, 2020 Reg. No. 21842
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January 2020
Table 1: Scandia Groundwater Elevation Data
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January 2020
Table 1: (Continued) Scandia Groundwater Elevation Data
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Table 2: Water Quality Monitoring Results
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January 2020
Table 2: (Continued) Water Quality Monitoring Results
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January 2020
Table 3: Production Well Records
MINING
LIMITS
MINING
LIMITS
MINING
LIMITS
DRESEL
MINE
TILLER MINE
COMMON MINING
BORDER
Engineering, PLLC.
Sunde
Figure 1
Aerial Photo
Annual Operating Permit
Aerial image from Kespry Aerial Photo (collected via drone
on September 24, 2019) over active portions of Mine and
Washington County 2017 over remaining areas.
100'
50.00 PEMBgPEMBPEMBPEMBPEMCPSS1BPEMBPUBGPEMBPEMCPEMBPEMBPEMBPSS1BPEMCPEMCxPEMBPEMCPEMCPUBGPUBGPFO1CPEMCPSS1/3BPEM/SS1BPEMCPEMAPEMCPEMCPEMCPEMBPEMB SS1PSS1BPEMCPEMCPSS1BPEMCPEMCPUBG218TH ST. N.PSSIBPEMFPEMCPEMCSTOCKPILE ANDPROCESSINGAREA(Future Mining)RECLAIMEDAREARECLAIMEDAREARECLAIMEDAREAMININGLIMITSSCREENING BERMLOCKINGGATEMININGLIMITSMININGLIMITSRECLAIMEDAREAHAUL RD. TOLOFTON AVE.DRESEL MINETILLER MINECOMMON MINING BORDERCURRENT LIMITSOF EXCAVATIONINTOGROUNDWATER2020 POTENTIALMINING AREA2020 POTENTIALMINING AREAHAULROADLOCKINGGATELOCKINGGATE SCREENING BERMMaintain 50'Wetland Setback2020 POTENTIALRECLAMATIONAREAMaintain 50'Wetland Setback2020 POTENTIALRECLAMATIONAREAMW-1PZ-5PZ-4SCALE HOUSEWELLPZ-6PZ-3PRODUCTIONWELLCURRENT LIMITSOF EXCAVATIONINTOGROUNDWATERSHEET NO:DATE:DRAWN BY:CHECKED BY:SCALE:APPROVED BY:PROJECT NO.:REG. NO.:DATE:I HEREBY CERTIFY THAT THIS PLAN,SPECIFICATION, OR REPORT WAS PREPAREDBY ME OR UNDER MY DIRECT SUPERVISIONAND THAT I AM A DULY LICENSEDPROFESSIONAL ENGINEER UNDER THE LAWSOF THE STATE OF MINNESOTA.DESCRIPTION:INFORMATION:REVISIONDATEEngineering, PLLC.CONSULTING CIVIL ENGINEERS10830 NESBITT AVENUE SOUTHBLOOMINGTON, MINNESOTA 55437(952) 881-3344 TELEPHONE(952) 881-1913 FAXwww.sundecivil.comSundeKirsten Pauly 93-253KPGraphic12/28/16KP1 of 1Figure 2218421/20/2019City Comments 2/13/2020Update for 2020 AOP1/15/20Update PZ-6 Label3/4/2019Update for 2019 AOP1/15/19Update for 2018 AOP1/16/18Update for 2017 AOP12/28/16Update for 2016 AOP1/13/16Update for 2015 AOP1/14/151/24/14 Update for AOP2013 Update for AOP1/28/13Add Dresel property line1/23/12Add MW-61/19/12Well Labels3/3/11SITE PLANTILLERCORPORATIONSCANDIA,MINNESOTA····2020ANNUALOPERATORS PERMIT
W.E.933.3CONVEYER22044Z 995.73022045Z 989.82011043E 692146.185N 120313.24022046Z 950.800MANNING AVENUE EAST 1223.25S 89°22'12" W 1422.96S 89°41'05" W 1287.61S 89°19'52" W 1277.99N 89°57'12" E 2649.44S 89°44'30" E 693.00N 89°52'27" E 983.08N 5°42'43" E 6
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= 0°26'05"
L = 17.39
R = 1909.86
= 9°57'32"
L = 331.96
N 12°23'
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E
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9
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N 1°25'56" E 1420.46
N 0°35'31" W 1317.76
S 1°01'20" E 1325.79
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S 0°33'43" E 1319.60
1978.57
50' SETBACK4:1 SLOPESS 89°31'35"W65.46NSP CO. EASEMENTR = 1980.97
= 20°29'54"
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940930 916±100 FEETVARIESMINIMUM TOPSOIL ANDSEEDED TO ESTABLISHNATIVE VEGETATION6:1 SLOPE FOR AHORIZONTALDISTANCE OF 100'SLOPE VARIES- 4:1 MAX.146:1 SLOPE61VARIESSLOPE VARIES- 3:1 MAX.13TYPICAL SECTION EDGE OF WATER BODYDEPTHVARIES218TH ST. N.LOFTON AVE. N.10001000990980970970980990970980960950940920930950960990
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9409301000 PROPOSED FUTURE LAKE CONFIGURATIONWATER ELEVATION AT 916+/-BOTTTOM OF LAKE AT 870-8909309409509609709809901000932934936938922924926928930940950960Mining Limit4.ISHEET NO:DATE:DRAWN BY:CHECKED BY:SCALE:APPROVED BY:PROJECT NO.:REG. NO.:DATE:I HEREBY CERTIFY THAT THIS PLAN,SPECIFICATION, OR REPORT WAS PREPAREDBY ME OR UNDER MY DIRECT SUPERVISIONAND THAT I AM A DULY LICENSEDPROFESSIONAL ENGINEER UNDER THE LAWSOF THE STATE OF MINNESOTA.DESCRIPTION:INFORMATION:REVISIONDATET. , R. , S. #DRAWING: \\kirstensoldpc\DWGS\a-Tiller - All\Tiller Scandia\Annual Operators Permit\AOP 2020\Figure 3 - 2019 AOP Mining and Reclamation Plan.dwg LAYOUT: C3 11x17Engineering, PLLC.CONSULTING CIVIL ENGINEERS10830 NESBITT AVENUE SOUTHBLOOMINGTON, MINNESOTA 55437(952) 881-3344 TELEPHONE(952) 881-1913 FAXwww.sundecivil.comSundeKIRSTEN PAULY 93-253 KPGraphic10/18/07 1 of 7Figure 3218421/15/2019Update for 2020 AOP1/22/2020Update for 2019 AOP1/15/2019Update Dresel Reclamation Grades1/16/20182010 AOP Add Dresel Site2/4/10Revise Mining Limits Near Wetland 812/10/08Update per CUP8/13/08Watershed District Comments6/3/08City Comments4/21/08 GL7,8 2032 93-253MINING ANDRECLAMATIONPLAN600300300TILLERCORPORATIONSCANDIA,MINNESOTA2020ANNUALOPERATORS PERMIT