Loading...
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 Tiller Corporation Page 2 2020 Annual Operators Permit Application 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. Tiller Corporation Page 3 2020 Annual Operators Permit Application January 2020 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 Tiller Corporation Page 4 2020 Annual Operators Permit Application 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. Tiller Corporation Page 5 2020 Annual Operators Permit Application January 2020 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. Tiller Corporation Page 6 2020 Annual Operators Permit Application 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. Tiller Corporation Page 7 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         Tiller Corporation Page 8 2020 Annual Operators Permit Application January 2020 Table 1: Scandia Groundwater Elevation Data   Tiller Corporation Page 9 2020 Annual Operators Permit Application January 2020 Table 1: (Continued) Scandia Groundwater Elevation Data Tiller Corporation Page 10 2020 Annual Operators Permit Application January 2020 Table 2: Water Quality Monitoring Results Tiller Corporation Page 11 2020 Annual Operators Permit Application January 2020 Table 2: (Continued) Water Quality Monitoring Results Tiller Corporation Page 12 2020 Annual Operators Permit Application 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 2 3 . 5 1 N 89°37'35" E631.03R = 2291.82 = 0°26'05" L = 17.39 R = 1909.86 = 9°57'32" L = 331.96 N 12°23' 4 6 " E 9 0 6 . 9 4 N 1°25'56" E 1420.46 N 0°35'31" W 1317.76 S 1°01'20" E 1325.79 S 41°53'22" W363.70 S 17°44'22" W428.16L = 331.96 = 9°57'32"R = 1909.86L = 331.96 = 9°57'32"R = 1909.86L = 331.96 = 9°57'32"R = 1909.86249.34 S 0°01'45" W 659.62 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" L = 674.38 963.2955.5958.5956.9964.4962.4969.7962.4958.2962.9961.3970950970960940972.8960.2973.8968.9966.3959.2951.3945.2942.6945.6962.4945.2940.8940.2944.2950.7954.4957.6958.3957.6953.7948.8962.3956.1961.9972.7994.9969.4969.6965.5981.3974.5930.4939.9956.8968.6974.4959.0928.2958.2962.9986.7950960950950960 9409609509509609609 5 0 96096095096094094095096096096094 0 950 95095096095094095094095096097099098010009709709709909 9 0 10 00 970970 97098099098098097010 10 980 97098099050' SETBACKGATELOFTON ROAD970980960950940920930950960990 980 970 960 950 940 930 920 940930920950960970980990960960950920 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 980 970 960 950 940 930 920 940930920950960970980990960960950920 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