9.a iii) 2019-01-28 APPLICATION FOR ANNUAL OPERATORS PERMIT-TILLERSunde Engineering, PLLC.
10830 Nesbitt Avenue South • Bloomington, Minnesota 55437-3100
Phone: (952) 881-3344 • Fax: (952) 881-1913 • E-Mail: info@sundecivil.com
January 2019
2019 APPLICATION FOR THE
ANNUAL OPERATORS PERMIT
Scandia, MN
Consulting Civil Engineers
Tiller Corporation Page 1
2019 Annual Operators Permit Application
January 28, 2019
APPLICATION FOR ANNUAL OPERATORS PERMIT
TILLER CORPORATION
SAND AND GRAVEL MINING OPERATION
CITY OF SCANDIA
WASHINGTON COUNTY, MINNESOTA
January 2019
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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with procedures set forth in Ordinance No. 103, extended hours were requested and
approved in 2018. 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 accommodate area projects on
fourteen separate occasions in 2018. There were a variety of reasons for the
requested extended hours. Rain delays and keeping local road projects on schedule
were the primary reasons for the requests.The majority of the extended hours
requests were to accommodate the road improvement projects in the City of Scandia
and were requested intermittently between the end of May through mid-September.
The requests included four early starts at either 5 AM or 5:30 AM for the asphalt
plant, one request for extended evening hours until 9:00 PM and two requests to
operate on Saturdays, generally between 7 AM and 4 PM. An additional five
extended hours requests were authorized to operate on Saturdays, generally
between 7 AM and 4 PM and one request to operate until 9:00 PM to keep a number
of CSAH projects located in Chisago County on-schedule, as well city street projects
located in Wyoming, Dellwood and Lake Elmo and the I-35 project in Forest Lake.
Lastly, there was one incident on June 29th when the power went out for a large
portion of Scandia, which affected the ability for the asphalt plant to shut -down
properly. A request for extended hours to operate the generator until 8:30 PM was
authorized in order to properly shut-down the asphalt plant.
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 2019.
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 2018. If clearing activity
occurs, it will occur within the 2019 Potential Mining Areas as depicted on Figure 2,
Site Plan.
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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.
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 2018. 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
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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. Approximately 9,000 tons of recycled
concrete and approximately 10,000 tons of recycled asphalt pavement (RAP) was
processed in 2018. Asphalt production used approximately 50,000 tons of RAP in
2018. Processed RAP is used in asphalt production and recycled concrete is sold in
various aggregate products.
A Solid Waste Storage Facility license that authorizes the storage of unprocessed
concrete, concrete products and brick and a Recycling Facility license that
authorizes the storage and processing of recycled asphalt products are issued 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.
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 is in the process of being
reviewed. Once the review is complete, information pertaining to the permit will be
submitted to the City.
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 2018, excavation into the groundwater table did
not occur. Excavation into the groundwater table is likely to occur in 2019 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.
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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.
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 previous depth of excavation has been measured at approximately 904
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 445,000 tons of material was
removed in 2018.
2. Amount of add-rock brought onto the site: Approximately 110,520 tons of Class A,
Class B, Class C and Class D add-rock were imported to the site in 2018.
3. Amount of recycled asphalt brought to the site: Approximately 38,000 tons of asphalt
for recycling was imported to the site in 2018.
4. Amount of recycled concrete brought to the site: Approximately 12,000 tons of
concrete for recycling was imported to the site in 2018.
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5. Area reclaimed and type of reclamation: Reclamation activities in 2018 included
placement of overburden and suitable fill material on portions of the slope along the
west perimeter 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 along
the west perimeter near the common mining border during 2019. These areas are
shown on Figure 2, Site Plan as 2019 Potential Reclamation Activity. Some of the
areas shown as potential reclamation will also see active mining during 2019. Once
mining is complete, reclamation may advance into these areas during 2019.
6. 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 2018 was
approximately 242 trucks per day.
D. Description of operating conditions planned for the coming year:
During the 2019 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 2019 production schedule anticipates mining and processing during the 2019 mining
season. The exact area of excavation will depend on the required gradation of the end
products. Mining anticipated during 2019 will occur within the 2019 Potential Mining Area
and some of the Potential Reclamation Areas as indicated on Figure 2, Site Plan.
Aerial Photo: Figure 1, Aerial Photo, a 2017 aerial photo is attached that 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 2019, potential reclamation activity in 2019, 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 the area along the west perimeter near the common mining border during 2019.
These areas are shown on Figure 2, Site Plan as 2019 Potential Reclamation Activity.
Operating Conditions for 2019: The 2019 production schedule anticipates mining and
processing during 2019. Mining will occur within the 2019 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.
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January 28, 2019
E. Inspection:
The City conducts an annual inspection of the site. The last inspection occurred on
October 9, 2018.
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, 2019 Reg. No. 21842
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Table 1: Scandia Groundwater Elevation Data
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Table 1: Scandia Groundwater Elevation Data
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Table 2: Water Quality Monitoring Results
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Table 2: Water Quality Monitoring Results
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Table 3: Production Well Records
Scandia Mine
Pumping Records: 2018 Operating Season
Production Well
Month Amount Pumped (Gal)
January 0
February 0
March 0
April 11,750
May 6,412,575
June 6,528,050
July 212,700
August 121,300
September 52,000
October 44,004
November 4,000
December 0
13,386,379 Total Pumped in 2018:
Water Appropriation Permit authorizes withdrawal
of up to 20 million gallons per year.
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 Washington County 2017
100'
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