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4.d Tiller Corporation TKDA 444 Cedar Street,Suite 1500 Saint Paul,MN 55101.2140 ENGINEERS•ARCHITECTS•PLANNERS (651)292-4400 (651)292-0083 Fax www.tkda.com MEMORANDUM To: City Council Reference: Tiller Corporation - Conditional Use Planning Commission Peu,iiit Application for a Mining and Anne Hurlburt, Administrator Processing Operation Copies To: Proj. No.: 14059.001 From: Sherri Buss, R.L.A. Routing: Date: May 2, 2008 SUBJECT: Tiller Corporation - Conditional Use Permit Application for a Mining and Processing Operation MEETING DATE: May 6, 2008 LOCATION: Sections 7 and 8, Township 32 North, Range 20 West APPLICANT: Tiller Corporation 7200 Hemlock Lane, Suite 200 P.O. Box 1480 Maple Grove, MN 553 1 1-6480 120-DAY PERIOD: June 12, 2008 ZONING: Agricultural District, Shoreland Overlay District ITEMS REVIEWED: Application, Plans BRIEF DESCRIPTION OF THE REQUEST: The Application is for a new Conditional Use Permit (CUP) for an existing sand and gravel mining operation located on Manning Avenue near 225th Street in Scandia. The site has been actively mined since 1966, and has operated under a previous CUP granted by Washington County, when the County exercised land use authority within New Scandia Township. Permitted activities included the mining and processing of aggregate, the production of hot-mix asphalt, and the recycling of concrete and asphalt products. The site includes several parcels. The total site area is 395 acres, and 155 of these are proposed for mining and reclamation. An Employee Owned Company Promoting Affirmative Action and Equal Opportunity Scandia Planning Commission Page 2 May 2, 2008 Tiller Corporation, CUP for Mining Mining Operations The mining operation includes removal of overburden, excavation of sand and gravel, crushing, washing, screening, stockpiling of sand and gravel; recycling of concrete and asphalt products; the production of hot- mix asphalt and reclamation activities. The overburden is removed from areas to be mined, and stockpiled on the site for use in reclamation activities. The Applicant indicates that the site usually operates on a seasonal basis from mid-April to mid-November, depending on weather conditions. The aggregate is excavated above groundwater using front-end loaders. A dragline or excavator will be used to excavate material within the groundwater. Processing activities include crushing, screening, and stockpiling. The recycling of concrete and asphalt on the site also includes crushing, screening and stockpiling. Front-end loaders place the specified aggregates into cold feed bins. The aggregates are metered out onto a p conveyor, which delivers the aggregate into a rotatingdrum, where theyare blended, heated and dried. Y Heated asphalt cement and recycled asphalt are mixed with the heated aggregate and conveyed into insulated overhead silos. Trucks are loaded from the silos, and weighed. The final product is delivered to project sites throughout the area. The asphalt plant at the site is equipped with a baghouse air pollutant collection device, and operates under a Minnesota Pollution Control Agency (MPCA) Air Emissions Permit. Storage tanks at the site (for fuel and asphalt cement) are regulated by the MPCA. The main access route to and from the site are Manning Avenue (County Road 15) and Lofton Avenue (County Road 1). Both Manning and Lofton and are paved. The haul road from Manning Avenue is paved through the site to the hot-mix asphalt plant and loading area. The Applicant notes that blasting does not occur at the site. Phasing of Site Operations The Applicant indicates that there are three phases of mining remaining at the site. Mining will occur both above groundwater and into the groundwater in each of these phases. The Applicant indicates that due to the variable nature of the aggregate deposit, it is necessary to mine above and below the groundwater concurrently in order to obtain the proper blend of aggregates. Mining into the groundwater will occur for the first time under the new penriit. This activity has been described in the previous mining plans for this site, and was evaluated in the Environmental Assessment Worksheets completed for the Tiller site in 1987 and 1999, but has not been implemented in previous mining phases. The Phasing Plan indicates that Phase la and 1 b will occur throughout the central portion of the site. Phase 2 will expand the operation to the east, and Phase 3 will expand operations to the east again. An estimated 9 million cubic yards of aggregate reserves remain at the site. Annual production at the site is 300,000 to 400,000 cubic yards. The Applicant indicates that the life of the facility is estimated to be about 20 to 30 years, but is dependent on market demand. The phasing plan identifies four remaining phases: la is Scandia Planning Commission Page 3 May 2, 2008 Tiller Corporation, CUP for Mining along the north boundary of the site and would be mined concurrently with lb at the south along the entry drive; phase 2 is in the center of the site, and phase 3 is in the eastern 1/3 of the site. Groundwater and Surface Water Maps included in the application indicate that the water table is located at an average elevation of approximately 920 feet. The bottom depth of the lake proposed to be created as a part of site reclamation is mapped at approximately 870 feet. The Applicant describes a variety of measures instituted at the site to control potential spills. A Spill Prevention Control and Counter Measures Plan has been prepared for the site, including reporting requirements that meet state statutes and regulations. Groundwater monitoring is conducted on an annual basis at the three wells on the site. The monitoring well network will be expanded prior to mining into the groundwater. Three additional monitoring wells will be installed before mining activity begins to monitor groundwater quantity and quality. The wells will be used to record water levels twice a year during the spring and fall. The wells will also help to define the regional water table near German Lake, and to monitor fluctuations of groundwater levels associated with mining activity. Monitoring results will be submitted to the City of Scandia. The Applicant indicates that surface water will be managed in accordance with the site's NPDES Stormwater Pollution Prevention Plan (SWPPP), and consistent with local watershed management plans. The SWPPP includes a variety of Best Management Practices (BMP's) to avoid discharge of untreated water from the site, minimize erosion and sedimentation, and stabilize the site at the conclusion of mining activity. Stormwater collects on the floor of the mining operation to handle internal drainage. It is pumped when needed to a second upland sedimentation basin for additional treatment. If this second basin overflows, the water enters an infiltration basin area prior to entering a wetland on the site. There are no permanent ponds for washing operations. Temporary ponds are located near the washing plant. Sediment from the ponds is used in reclamation activities. Berms and Screening The site has some existing berms at the site entry from Lofton Avenue and on the northern boundary. It is also screened by wooded areas on the west and southeast portions of the site. No additional screening is proposed. Reclamation Plan The reclamation plan includes slope stabilization, seeding and mulching. It also includes creation of a 50- acre lake in the central portion of the site. Environmental Review Completed on the Site Two Environmental Assessment Worksheets (EAWs) have been completed for this mining facility. The first was completed in 1987 as a part of the initial permitting process. The second EAW was completed in 1999 Scandia Planning Commission Page 4 May 2, 2008 Tiller Corporation, CUP for Mining for a proposed expansion of the facility. At that time, the mining limits were revised by adding areas to be mined on the east side of the property, and removing areas that were more environmentally sensitive on the western side of the property from the mining limits. The scope of operations and mining limits proposed in the current permit application to the City are consistent with the scope of the operations and mining limits reviewed in the 1999 EAW. The site is exempt from further environmental review, unless the proposed mining and related operations expand beyond those evaluated in the 1999 EAW. Both EAWs included evaluation of environmental impacts that could result from mining into the groundwater to the degree proposed in this application, and creation of a lake as a part of the reclamation plan. During the EAW process, Washington County hired Barr Engineering Company to perform a hydrogeologic investigation of the impacts of mining into the groundwater, and the potential impacts of the artificial lake on German Lake. The report detennined that the impacts of the withdrawal of gravel from below the water table would have a negligible long-term effect on the water table and the level of German Lake. EVALUATION OF THE REQUEST The Applicant is requesting a Conditional Use Permit for a mining operation. The proposed use is governed by the City's Ordinance No. 103, Mining and Related Activities Regulations. This review evaluates the request for a CUP based on the City's Ordinance and materials submitted by the Applicant. Groundwater Issues LBG conducted an initial review of CUP Application and related information in March 2008, From this review process, LBG identified specific portions of the CUP Application that required additional information and/or clarification on ground-water related issues. LBG prepared a series of questions that outlined these data gaps, which were submitted to Sunde Engineering through TKDA. Sunde responded in writing on April 15, 2008. LBG has reviewed this recent information and found that it sufficiently addressed the questions with the exception of the items presented in the general comments in LBG's letter dated 4/28/08 (attached). General Comments 1) Depth to Ground Water and Flow Directions: The three on-site piezometers will provide sufficient information to determine depths to ground water, ground-water elevations, and flow direction of the water table aquifer across the site. Current data shows ground water in the water table aquifer flows to the northwest. The addition of the upgradient well proposed for the Dresel site and the proposed downgradient well on the Tiller site will better characterize these conditions. 2) Hydraulic Connection to German Lake: LBG has reviewed the available information from Barr Engineering, Emmons & Olivier Resources, and Sunde in regards to German Lake and the potential impact to this lake as a result of mining below the water table. LBG agrees with the conclusions presented in these documents that withdrawal of gravel below the water table will have a negligible long-term effect on the water table and German Lake. This conclusion is based on the hydrogeology of German Lake and the surrounding area. This lake and other shallow wetlands in the area are Scandia Planning Commission Page 5 May 2, 2008 Tiller Corporation, CUP for Mining created by surface water runoff and shallow ground water that remain suspended or perched above the regional water table aquifer. Clay layers above the water are typically responsible for creating these perched features, which are not hydraulically connected to underlying water table aquifer. Tiller has proposed a monitoring plan to identify potential impacts to the water table and Gemian Lake. 3) EAW: LBG has reviewed the ground-water sections of the EAWs that pertain to ground water, the other information provided to date, and the proposed ring plan that will be implemented as part of the CUP Application. With respect to ground-water, LBG agrees with the 1987 and 1999 EAWs regulatory findings and the negative declarations for an EIS. 4) Monitoring Needed: The CUP Application states that a diesel range organics (DRO) will be monitored in the existing and proposed wells. However, DRO does not identify the full gasoline range organics (GRO) spectrum. If gasoline is to be stored on site, then GRO and benzene should be added to the list of analytical methods. Recommendations Given the general comments above and from our review of the CUP Application and subsequent information provided by Sunde Engineering, LBG has the following recommendations for the Tiller site: • At this time, LBG does not see a need for Tiller to install more wells in the sand and gravel other than those already proposed. The existing and proposed monitoring well network appears to be sufficient and will characterize the depth to ground water and flow direction across the site in the water table aquifer. • LBG recommends that Tiller keep records of when the Production well is pumping. • Water-level measurements should be collected monthly for the first year and quarterly thereafter to evaluate seasonal variation in water elevation and to evaluate potential hydraulic connection between the sand and gravel aquifer and German Lake. Monitoring frequency should be increased in wells closest to the area where mining occurs below the water table when mining into the water table. • LBG agrees that ground-water samples should be analyzed for DRO. However, if gasoline is to be stored on site, then GRO and benzene should be added to the list of analytical methods. • At this point, given the current well search data provided and the proposed on-site monitoring well network, LBG does not recommend further investigation and monitoring of off-site residential wells. The proposed monitoring well network appears to be sufficient to identify potential impacts that may migrate off site. Watershed District and WCD Review of Surface and Groundwater Issues The Carnelian-Marine-St. Croix Watershed District Engineers have recommended that the District Managers approve a Permit for Tiller Corporation Mining Operations, contingent on the Applicant addressing the Scandia Planning Commission Page 6 May 2, 2008 Tiller Corporation, CUP for Mining comments of the satisfaction of the District Engineer. Washington Conservation District staff reviewed wetland issues on the site, and provided recommendations that are included in the conditions for the CUP, The Applicant is required to obtain a permit from the CMSCWD and Comfort Lake-Forest Lake Watershed District as a condition of the CUP. Traffic There are two accesses to the mining site; one from 223rd Street west of Lofton Avenue, and one from another roadway approximately at 223rd Street east of Manning Trail. From information provided by the applicant, the maximum truck traffic is 750 trucks per day including both production and asphalt activities. Additional data from the applicant predicts average daily truck traffic at 173 or 212 trucks per day depending upon the production. Another 30 trips per day are expected from employees. The majority (70%) of this traffic will be use the roadway to access Manning Avenue, with approximately 5% of that to and from the north and 95% to and from the south. A northbound right turn lane and southbound bypass lane are provided on Manning Avenue. A 'trucks hauling' sign is also provided for vehicles approaching from the north. A review of reported crashes did not show any crashes in this area from 2000 to 2005. Manning Avenue has an existing average annual daily traffic (AADT) volume is 1,250 vehicles per day in this area. The other traffic to and from the site uses Lofton Avenue, with traffic approximately split between north and south. A single lane of approach for each direction is provided at the 223rd Street and Lofton Avenue intersection. There are no 'trucks hauling' signs posted on Lofton Avenue. A sign on site at the intersection with Lofton Avenue does prohibit trucks from using 228th Street. The existing AADT volume is 2,150 vehicles per day. A review of reported crashes showed only one property damage crash at this intersection in the years 2000 to 2005. It is important to note that, depending upon where a project is located, the directional distribution can be altered significantly. However, since turn lanes are provided on Manning Avenue and the AADT is lower, the applicant is recommended to encourage most, if not all, trucks to use that access. • Posting 'trucks hauling' signs for the northbound approach on Manning Avenue and both approaches on Lofton Avenue are also recommended. Supplemental distance signs should also be provided below these signs and the existing one to inform drivers of the approximate location of the access. • Without lighting in the area and given the number of residences surrounding the site, hours of operation are also important. Restricting trucks to daylight hours, one hour before sunrise and one hour after sunset, or some other type of daytime limit, would provide benefits to traffic safety as well as overnight traffic noise. Alternatively, providing street lighting at the Manning Avenue access, and potentially the Lofton Avenue access, would allow operation later into the night. • Since the access to Lofton Avenue restricts trucks using 228th Street, a similar sign should be posted for the Manning Avenue access. This would keep the truck traffic off the local roadway near the site. Scandia Planning Commission Page 7 May 2, 2008 Tiller Corporation, CUP for Mining Reclamation Plans Purpose The Scandia Mining Ordinance requires mining operators to provide a reclamation plan as part of their Conditional Use Permit Application (Chapter 4, Section 8). The plan must include graphic representation and written text. The Ordinance defines Reclamation, Restoration, Rehabilitation as follows: "To renew land to a self-sustaining, long-term use which is compatible with contiguous land uses and which process shall include re-establishment of vegetation, soil stability and establishment of safe conditions appropriate to the intended use of the land in accordance with the City's Comprehensive Plan and Conditional Use Pen-nit conditions allowing for excavation and/or processing on the site." The ordinance further defines elements that must be present in the plan (intent of reclamation or final use, phasing and timing of reclamation, final condition of the site, etc.) timing concurrent with mining operation, requirements for grading and filling including final slopes, drainage, cover and planting, topsoil and removal of structures. If a mining operation will result in "accumulation of substantial water areas after reclamation" additional requirements such as water depths, grades above land as well as bottoms of water bodies are identified. In order to assure that the conditions of the reclamation plan are being addressed, renewal of the Annual Operators Peimit (AOP) will in part depend on progress toward reclamation made on a yearly basis. To ensure that reclamation does occur in accordance with the approved plan," the applicants are required to provide to the City an Irrevocable Letter of Credit or other security satisfactory to the City in the amount determined by the City." (Chapter 4 Section 9.3) The Tiller Mining Site is designated as General Rural - Agriculture Area in the Scandia Comprehensive Plan. The Plan states: "The General Rural/Agriculture Area is envisioned as an area that will remain sparsely developed over the next 25 years." The Scandia Zoning Ordinance designates the Tiller mining area as A-4 Agriculture. The two primary land uses in AG districts are Agriculture and Single Family Residential. Agricultural Use is defined as "Land whose use is devoted to the production of horticulture and nursery stock, fruit of all kinds, vegetables, forage, grains, bees and apiary products and raising domestic farm animals." The overall density of residential units is limited to four units per 40 acres. The range of potential final uses is limited to agriculture (including open space) and single family residential at a density no greater than 4 units per 40 acres. If clustering (under the Open Space Conservation Subdivision provisions of the Zoning Ordinance) is proposed, a landowner may increase density slightly provided certain conditions are met. Evaluation of the Tiller Reclamation Plan The Tiller CUP mining application includes the following documents: 1) Conditional Use Permit Application to the City of Scandia for Mining and Related Activities, Reclamation Plan in Conformance with Section 8 2) Cl Existing Conditions (dated 1/8/08) 3) C2 Site Plan (dated 1/8/08) Scandia Planning Commission Page 8 May 2, 2008 Tiller Corporation, CUP for Mining 4) C3 Mining and Reclamation Plan (dated 4/21/08) 5) C3-A Reclamation Sequencing (dated 4/20/08)' 6) C4 Phasing Plan (dated 1/8/08) 7) CI0 Concept Ultimate Use Plan (dated 4/17/08) 8) Letter to Sherri Buss from Kristen Pauly (dated 4/23/08) The Tiller reclamation plan submitted as part of the CUP application addresses the ten points listed in the ordinance with graphic and text submittals (Section 8.1). The reclamation plan states the purpose of reclamation activities is to "restore the site to a stable condition, minimize the potential for erosion and allow for future development of the site." The plan with revisions on updated plans describes the methods and process of reclamation, including prescribed seed mixtures for long-term soil/slope stabilization. It addresses phasing of operations and reclamation and shows final condition of the site. It includes a detailed description of the reclamation costs, which are estimated at $205,227 in 2008 dollars. The ordinance states that reclamation is to proceed concurrently and proportional to actual mining operations. Although much of the mining area has been opened up, the reclamation plan does not propose a reclamation schedule. The Reclamation Plan states that "reclamation will proceed concurrently with mining operations. Reclamation activities which take place during the past mining season as well as reclamation activities planned for the subsequent mining season will be discussed in each annual report." The Reclamation Plan includes a Reclamation Sequencing Plan (C3-A). This graphic shows the area already reclaimed on the northwest side of the mining area. It proceeds counter-clockwise from Reclamation Area 1 through Reclamation Area 6. The plan notes state that "this plan represents the general progression of reclamation. As mining is completed along the perimeter of the mining limits, slopes will be backfilled and stabilized with vegetation. Final reclamation will involve the removal of screening berms and areas that have been previously stabilized may be reworked to achieve final restoration grades and/or ultimate development grades. Because of the need to establish a large enough floor area for stockpiling and processing as well as a large enough area for dragline operations, it is not possible to reclaim an equivalent number of acres for every new acre that is opened to mining." The City will need to establish some timeline associated with the reclamation stages in order to form the basis for the AOP. The ordinance lays out requirements for excavations resulting in the accumulation of substantial water areas after reclamation. The proposed depth of the lake is proposed to be between 46 and 26 feet and not more than 50 acres. The reclamation plan states that areas surrounding the future lake will be sloped to a maximum 4:1. Four inches of loamy on-site soils will be placed over the sloped areas. They will be seeded and mulched to establish vegetation. The ordinance requires this area to be planted with trees, shrubs, legumes or grasses. The Reclamation Plan addresses this by indicating uplands will be planted with a mix of native trees, shrubs, grasses, flowers and groundcover. The plan indicates that no areas will have slopes greater than 4:1, consistent with ordinance provisions. The ordinance requires that the bottom contour of any lake shall be gradually sloping from the shoreline to the Scandia Planning Commission Page 9 May 2, 2008 Tiller Corporation, CUP for Mining deepest portion of the water body with a maximum slope of 6 feet horizontal to 1 foot vertical for at least 100 feet from the proposed shoreline toward the center of the water body. Beyond 100 feet in horizontal distance, the slope of the bottom contours may be no steeper than 3 feet horizontal to 1 foot vertical. The Typical Section Edge of Water Body shown on Figure C3 meets these requirements. Section 8.4 of the Mining Ordinance addresses excavations which must be graded or backfilled. The applicant has provided a Soil Balance Calculation. Based on this information, 1.77 million cubic yards (cy) of material will be needed for final reclamation at slopes not to exceed 4:1. According to the information provided there are about 1 million cy of overburden material yet to be excavated and 125,000 cy of material is already stockpiled. Reject material is expected to be 800,000 - 900,000 cy. Based on this information, it appears there is adequate material (1.92-2.02 mcy) to meet reclamation requirements. The Reclamation Plan also states that additional clean fill may be brought to the site for shaping and grading to establish final restoration grades and prepare for final development. If additional fill is brought in, the City must approve that importation and it must be inspected and certified (8.4(1)). The Reclamation Plan shows three surface water management ponds surrounding the lake. Although the application addresses best management practices during operation, there is little discussion of how surface water quality will be maintained after complete reclamation. This must be addressed. The area is to be contoured to a gently rolling topography. The plan states that the maximum slopes will be 4:1, and if sufficient material is left over, the slopes will be reduced. The ordinance states (8.4(6) "such topsoil shall be planted with trees, shrubs, legumes or grasses." The Reclamation Plan proposes grasses, native trees, shrubs, flowers and groundcover. The final elevations planned for building purposes must not be less than 10 feet above the normal ordinary groundwater level. Plans for on-site septic systems must be considered. The owner has indicated that a joint sewerage system will probably be employed. Since most drainage from the site will remain on the site, it is not expected that there will be any adverse effects to public roads or neighboring uses. Issues/Recommendations • The parcel owned by the operators consists of 395 acres, with 155 acres to be actively mined and reclaimed. The area is zoned A-4 Agriculture, which allows an overall density of one unit per 10 acres. A sizeable portion in the southwest side of the property is within the Shoreland Overlay designation. The overall number of units possible on the site is approximately 39. The Concept Ultimate Use Plan prepared for Washington County shows approximately 58 units. If clustering (under the Open Space Conservation Subdivision provisions of the Zoning Ordinance) is proposed, it is possible to increase the density above the base density, but the owners should not assume bonuses above the underlying density. The City of Scandia, by approving a Reclamation Plan, makes no promises or commitments relative to the concept plan. Based on that plan, the City will expect the planned end use to be residential. The operator must make sure there are adequate areas for house pads and either on-site septic systems or a communal system. Scandia Planning Commission Page 10 May 2, 2008 Tiller Corporation, CUP for Mining • The Reclamation Plan states that no slopes will exceed 4:1, and depending upon available overburden and topsoil, the slopes will be less. The final slopes on this site cannot exceed 4:1. • From the infoiiiiation provided in the Soil Balance calculation, it appears there are adequate soil reserves on site to confoini to City slope standards. If the owner needs to import additional fill, it must notify the City and comply with the certification requirements of the ordinance. • No overburden or topsoil can be removed from this site, since the City prefers final slopes less than 4:1. • The process for stabilizing the soil must use prescribed methods and seed mixtures as per the most recent Mn/DOT Native Seeding Manual, as stated in the Reclamation Plan. • The Reclamation Plan has identified where there will be ponding areas when the land is ultimately reclaimed. The plan does not address in detail the measures to assure these ponds do not become stagnant or other maintenance measures. • The ordinance calls for a combination of trees, shrubs, legumes and grasses. The reclamation plan generally calls for grasses, trees, shrubs, etc. Today, most of Scandia is a mixture of grasses, scattered trees and woodlands. In order to restore the area into the surrounding landscape, some native trees should be included in the Reclamation/Restoration Plans. As the time for final restoration is to occur, the applicant must refine the landscaping part of the plan to assure trees on reclaimed areas before actual construction of any houses. • The Reclamation Plan does not link the life expectancy of the mining operation to the reclamation phases. • The Reclamation Plan is imprecise. It states that reclamation will proceed concurrently with mining operations: "Reclamation activities which take place during the past mining season as well as reclamation activities planned for the subsequent mining season will be discussed in each annual report." In order to provide a time frame within which to conduct the reclamation, the City will recommend timing for initial restoration phases, which will be enforced through the AOP process. - Reclamation Area 1 will consist of backfilling, sloping and vegetating this area. This should be accomplished in the 2011 season. - Reclamation Area 2 will consist of backfilling, sloping and vegetating this area. This should be accomplished in the 2015 season. - Reclamation Area 3 will consist of backfilling, sloping and vegetating this area. This should be accomplished in the 2018 season. - Reclamation Area 4 will consist of backfilling, sloping and vegetating this area. This should be accomplished in the 2021 season, depending upon progress of mining activities. Scandia Planning Commission Page 11 May 2, 2008 Tiller Corporation, CUP for Mining - Reclamation Area 5 will consist of backfilling, sloping and vegetating this area. This should be accomplished in the 2024 season, depending upon progress of mining activities. - Reclamation Area 6 will consist of backfilling, sloping and vegetating this area. This should be accomplished in the 2028 season, depending upon progress of mining activities. - Final Reclamation will include removal of any equipment, and any backfilling and seeding of the operations area. - It is expected that the reclamation will proceed concurrently and proportional to actual mining operations. Progress on concurrent reclamation as demonstrated in the AOP application, may allow reductions in portions of the Letter of Credit for reclamation on a five-year basis. • Section 9.3 of the Mining Ordinance provides for a financial guarantee to the City to assure compliance with the Reclamation Plan. The guarantee can take the form of a Letter of Credit or other security satisfactory to the City in the amount determined by the City. The applicant has provided a detailed cost estimate for reclamation, based on the original Reclamation Plan submitted. This estimate of$205,227 (in 2008 dollars) should be verified by the applicant in light of the revised Reclamation Plan reviewed here. Assuming a 20 year life span, and an annual inflation rate of 3 percent, ultimate reclamation costs in 20 years would be $328,500. The Mining Ordinance does state that "the operator shall be entitled to a reduction in the security amount on a dollar for dollar basis as reclamation is completed and approved by the City Engineer, except that the security shall not be reduced below an amount equal to 125 percent of the cost of the work to be completed as determined by the City Engineer nor below 5 percent of the security, unless the reclamation has been accepted by the City." • The Applicant must demonstrate that there is sufficient material on the site to complete the reclamation efforts. The City may increase the required financial guarantee if additional material needs to be imported to the site to complete the proposed reclamation. • After final reclamation, usage of the lake should be limited to non-motorized boats or boats with electric motors. • The applicant must address these issues, and prepare a final, separate Reclamation Plan based upon these recommendations. That final Reclamation Plan, which will require approval by the City, will form part of the basis for approval of the Annual Operating Pen-nit. This Reclamation Plan shall be updated every five years. Screening, Beaming and Related Site Issues The site plan (Sheet C-1) provided by the applicant indicates the existing fencing, benning and plantings. The additional benning noted on the plan along the northeast edge if the site will be required for approval of the CUP. • Scandia Planning Commission Page 12 May 2, 2008 Tiller Corporation, CUP for Mining The Reclamation Plan (Sheet C-3) includes the proposed seed mixes and maintenance for reclamation areas. These are appropriate and acceptable. Field visits to this site revealed that existing reclamation efforts have experienced significant erosion on planted areas that is compromising the success of the reclamation efforts. It is recommended that erosion control fabrics or other geotextiles be incorporated where needed in reclamation areas in addition to seeding, particularly in areas of concentrated storm water flows, to prevent erosion. Reclamation efforts will be monitored by the City, and where erosion issues are identified, the Applicant will be required to use appropriate methods to control erosion and assure the success of reclamation efforts. Bioengineering approaches that result in a natural appearance on the reclaimed areas should be utilized. PLANNING STAFF RECOMMENDATIONS: The proposed plans and supporting materials provided by Tiller Corporation, meet the requirements of the City's Code for issuing a Conditional Use Permit. The Planner recommends approval of the request, with the following conditions: 1. The Applicant must comply with all rules and regulations of Federal, State, County, and local agencies, and maintain existing permits granted by these agencies for all operations at the site (ongoing). 2. The Applicant must receive a Stonnwater Permit from Carnelian-Marine-St. Croix Watershed District and Comfort Lake-Forest Lake Watershed District (within 90 days of approval of the CUP). 3. The Applicant shall keep records of when the Production well is pumping, and provide these to the City as requested for monitoring activities (ongoing). 4. The monitoring plan shall include collection of monthly water-level measurements for the first year and quarterly thereafter to evaluate seasonal variation in water elevation and to evaluate potential hydraulic connection between the sand and gravel aquifer and German Lake. Monitoring frequency should be increased in wells closest to the area where mining occurs below the water table when mining into the water table. (Monitoring plan to be provided to the City within 60 of approval of the CUP; monitoring activities to be ongoing.) 5. Ground-water samples shall be analyzed for DRO. If gasoline is to be stored on site, then GRO and benzene should be added to the list of analytical methods (ongoing). 6. The Applicant shall post 'trucks hauling' signs for the northbound approach on Manning Avenue and both approaches on Lofton Avenue. Supplemental distance signs shall also be provided below these signs and the existing one to inform drivers of the approximate location of the access (within 60 days of approval of the CUP). 7. The hours of operation shall conform to the City's Ordinance and the following: hauling shall be conducted only between 7 a.m. and 7 p.m., Monday through Friday, during daylight hours, or one hour before sunrise and one hour after sunset during seasons when daylight is not available between 7 a.m. and 7 p.m. (ongoing). Scandia Planning Commission Page 13 May 2, 2008 Tiller Corporation, CUP for Mining 8. The Applicant shall restrict trucks to daylight hours, one hour before sunrise and one hour after sunset, OR may require that haulers install lights on the side of haul trucks, OR provide street lighting at the Manning Avenue intersection to improve safety at that intersection if hauling activities extend after sunset (ongoing). 9. The Applicant shall post a sign at the Manning Avenue access that is similar to the sign at the access to Lofton Avenue that restricts trucks using 228th Street, to keep the truck traffic off the local roadway near the site (within 60 days of approval of the CUP). 10. The Applicant shall provide a final, corrected copy of the Application materials and plan sheets to the City (within 60 days of approval of the CUP). 11. The Applicant must address the issues and implement the schedule for the reclamation plan identified in this report, and prepare a final, separate reclamation plan based upon these recommendations (within 60 days of approval of the CUP.) That final reclamation plan, which will be approved by the City, will form part of the basis for approval of the Annual Operating Permit. This Reclamation Plan shall be updated every five years. 12. The Applicant must apply for and obtain an Annual Operating Permit from the City. (Application completed within 60 days of approval of the CUP, and renewed on an ongoing basis.) 13. The Applicant shall comply with all other requirements of the City's Ordinance No. 103 (ongoing). The following additional conditions shall be addressed in the application for an Annual Operating Permit for the Mining and Processing Operation: 1. The Applicant shall incorporate erosion control fabrics, other geotextiles, or methods as needed in reclamation areas to prevent erosion. Reclamation efforts will be monitored by the City, and where erosion issues are identified, the Applicant will be required to use appropriate methods to control erosion that result in a relatively natural site appearance. 2. The Applicant shall address all of the comments and recommendations of the Washington Conservation District for wetland delineations and management, identified in the WCD memo of 3/28/08. 3. The Applicant shall encourage trucks to use the access provided on Manning Avenue. ACTION REQUESTED: The Planning Commission can: I. Recommend approval as written; 2. Modify and recommend approval Scandia Planning Commission Page 14 May 2, 2008 Tiller Corporation, CUP for Mining 3. Recommend denial if it is found that the request is not consistent with the Comprehensive Plan, CUP criteria or Mining Ordinance criteria, and not in the best interest of the community; 4. Table the request Staff request that the Planning Commission review this report and the conditions identified for the CUP and AOP, and that the Commission provide recommendations to the Council regarding this Application. LEGGETTE, BRASHEARS & GRAHAM, INC. PROFESSIONAL GROUND-WATER AND ENVIRONMENTAL.ENGINEERING SERVICES 8 PINE TREE DRIVE SUITE 250 ST.PAUL,MN 55112 (651)490-1405 FAX(651)490-1006 wu wJNTyYTN Com April 29, 2008 Ms. Sherri Buss, R.L.A. Senior Planner/Landscape Architect TKDA 1500 Piper Jaffray Plaza 444 Cedar Street St. Paul, MN 55101-2140 Re: Hydrogeologic Evaluation Aggregate Mining and Related Activities Tiller Corporation City of Scandia, Minnesota Dear Ms. Buss: Leggette, Brashears & Graham, Inc. (LBG) was retained by TKDA to review the Tiller Corporation (Tiller) Conditional Use Permit (CUP) Application for the purpose of identifying data gaps and potential ground-water issues that could result from current and proposed mining activities. The information provided below provides TKDA and the City of Scandia (City), Minnesota with LBG's comments and recommendations. The CUP Application, dated November 2007, was prepared by Sunde Engineering, PLLC (Sunde) on behalf of Tiller for the aggregate mining and processing operation (site) located on Manning Trail North in the City. The location of the site is shown on Figure 1. LBG conducted an initial review of CUP Application and related information in March 2008. From this review process, LBG identified specific portions of the CUP Application that required additional information and/or clarification on ground-water related issues. LBG prepared a series of questions that outlined these data gaps, which were submitted to Sunde through TKDA. At the time of our initial review, the information that was either missing or incomplete included: well logs for site wells; a request for proposed well construction for future observation wells; soil boring logs and survey data (including a map); site feature labeling on maps; historical water level data; information regarding potential hydraulic separation of different aquifers; information regarding the hydraulic connection between German Lake and the water table aquifer; and, confirmation of the water appropriation permit number for the on-site Production well and whether the Scale House well was appropriated. Sunde responded in writing on April 15, 2008. LBG has reviewed this recent information and found that it sufficiently addresses our questions with the exception of the items presented in the general comments section below. Attachment 1 includes Sunde's responses to our questions and the supplemental information provided. CONNECTICLII•01110•ILLINOIS•SOUTH DAKOT A•PENNSYLVANIA•FLORIDA•NEW JERSEY•TEXAS N'ISCONSIN•NLN YORK•MISSOURI•VI RMONT•MICHIGAN Ms. Sherri Buss 2 April 29, 2008 General Comments 1) Sunde Responses to LBG Questions: The supplemental information that was requested by LBG and provided by Sunde (see Attachment 1) should be included in the CUP Application. In general, Sunde's additional information shows the Tiller site is well characterized and the proposed monitoring plan will ensure any potential ground-water related issues are addressed. 2) Section II - Figures 4 and 5: Sunde should revise these figures to include a scale. 3) Section 11 - Figures C-5 through C-9: Sunde should revise cross section A-A' through J- J' to include tie lines (i.e. notes that indicate where a cross sections intersect). A note should be added on each cross section stating the date the water table surface elevations were determined. 4) Section II 9 F- MN County Well Index (CWI) Search: Well information from the CWI was provided by the City in a Memorandum dated April 1, 2008 for those wells located within a 1-mile radius of the site. The City also completed a drive-by search for residences not identified in the CWI that are within a 1/2 mile of the site. Given the results of this search, the proposed on-site monitoring well locations, and the monitoring plan in the CUP Application, LBG agrees that the existing well search information is sufficient at this time. 5) Section II 9 G, 0, P - Depth to Ground Water and Flow Directions: The three on-site piezometers will provide sufficient information to determine depths to ground water, ground-water elevations, and flow direction of the water table aquifer across the site. Current data shows ground water in the water table aquifer flows to the northwest. The addition of the upgradient well proposed for the Dresel site and the proposed downgradient well on the Tiller site will better characterize these conditions. 6) Section II 9 0 - Hydraulic Connection to German Lake: LBG has reviewed the available information from Barr Engineering, Emmons & Olivier Resources, and Sunde in regards to German Lake and the potential impact to this lake as a result of mining below the water table. LBG agrees with the conclusions presented in these documents that withdraw] of gravel below the water table will have a negligible long-term effect on the water table and German Lake. This conclusion is based on the hydrogeology of German Lake and the surrounding area. This lake and other shallow wetlands in the area are created by surface water runoff and shallow ground water that remain suspended or perched above the regional water table aquifer. Clay layers above the water are typically responsible for creating these perched features, which are not hydraulically connected to underlying water table aquifer. Tiller has a proposed a monitoring plan that be able to address any potential impact to the water table and German Lake. 7) Section 11 9 0 - EAW: LBG has reviewed the ground-water sections of the EAWs that pertain to ground water, the other information provided to date, and the proposed ring plan that will be implemented as part of the CUP Application. With respect to ground-water, LBG agrees with the 1987 and 1999 EAWs regulatory findings and the negative declarations for an EIS. 8) Section 11 9 P: The CUP Application states that a diesel range organics (DRO) will be monitored in the existing and proposed wells. However, DRO does not identify the full gasoline range organics (GRO) spectrum. If gasoline is to be stored on site, then GRO and benzene should be added to the list of analytical methods. Ms. Sherri Buss 3 April 29, 2008 9) Section III 7: Ground water will be extremely vulnerable as the mine will proceed below the water table. Appropriate precautions and contingencies should be in place so as to limit the potential for introducing contamination to the environment. Recommendations Given the general comments above and from our review of the CUP Application and subsequent information provided by Sunde, LBG has the following recommendations for the Tiller site. 1) At this time, LBG does not see a need for Tiller to install more wells in the sand and gravel other than those already proposed. The existing and proposed monitoring well network appears to be sufficient and will characterize the depth to ground water and flow direction across the site in the water table aquifer. 2) LBG recommends that Tiller keep records of when the Production well is pumping. 3) Water-level measurements should be collected monthly for the first year and quarterly thereafter to evaluate seasonal variation in water elevation and to evaluate potential hydraulic connection between the sand and gravel aquifer and German Lake. Monitoring frequency should be increased in wells closest to the area where mining occurs below the water table when mining into the water table 4) LBG agrees that ground-water samples should be analyzed for DRO. However, if gasoline is to be stored on site, then GRO and benzene should be added to the analyte list. 5) At this point, given the current well search data provided and the proposed on-site monitoring well network, LBG does not recommend further investigation and monitoring off-site residential wells. The proposed monitoring well network appears to be sufficient to identify potential impacts that may migrate off site. 6) The recommendations provided above do not include concerns presented in the Memorandums by Emmons & Olivier Resources (EOR), dated March 25 and April 1, 2008. LBG recommends Tiller comply with the EOR recommendations as well. If you have any questions concerning this review, please contact us at (651) 490-1405. Sincerely, LEGGETTE, BRASHEARS & GRAHAM, INC. `l I David S. Hume, P.G. Senior Associate Reviewed by: J. Kevin Powers, P.G. Principal DSH:kw Attachments S:ATech\Srandia AggregnreATilie,T lle,CUP rc,ie e(Se.Ii doc FIGURES LEGGETTE, BRASHEARS & GRAHAM, INC. C2N0,.....614...L #1 Z" e ,\ f Tiller Mine Site , I '� =.4 �� t6 _ • 1 I t� �' .1 � 4 p °a — _ ,t GooieLake e�L tit Way,'',f - • s„, 7 rt` r'J 'r _ r t C,aS �,,„., _ `,., i f -• ti:- q t" t t c.v i'.k" • . ,� „,t� �G ) bj l.` .S." ?�,'J� T 4• ram;-ai"J`f "l �e s,� ��>$,, .� _` J �_ . jr •• ' f 7 � =16 ( xa ]� •1z f tiiti �} (er,.r s, + t ' \G� ,�.. yt�t .�, j � ,r'"`4 1,F' ' •_ �q,. '"'§.C.1.t�i - f III L (` � �� e1- t ,'sai& Fr a.. e#pdiaf. t - G, k 4 jJx\ Y{ Ste'ndta �''F _ `-t% Y - 0 7' sl l ,S z \ r"` t' '-',',---,A,"'_X � �23 I t i 0 ,1( 11 4 _ �s1t`j,�n, �- 3 ,J � V &r--- 'Z,_ i ` - (te Ise- ,.,} t di. r i ik ��`e -.R C rr s `� ; `Q re, - t� �1' \ e�C°. Ire- • p .‘,,, •••• TL . • •33 ! t ��r +, �^^(\i ��i, "�I _ �. �" y /tiJ I frf •w V a u- �"� �..,rri•�O 4,3 _ -t. •'.:''''.-','',''2--,4-i::f;•-•if: :'-'7'.-,44't.-- ,i,i4N,:,,'-',‘:„,,'.'-'-,,:1';''',”' ,'-'1 ' ''''‘,. ��,,Ltl s t ✓ �jj��$ � ,r'1/l f ,i (5:6 y� `,,"}y c� i t 7:7 o t } ,,J L,� ' 1 1Vk.s. , k?f *^Lar . `S 7 ' � ",`3�t `"\. ��A� C i2 1 o- ! • M- ' i - fit„ ` * ', p t ' 't 13, s .„i -. _;..: _�- t't` ia,> , l rE • P �2 \s `"-,�- • a `''i' (4• � �t �fAhYA'E � t.� �-1 ) t .. i-i n3; 44r�Washington 3s County 5 ' � i ��' 0 3,000 6 000 d� `a s � .. D:C t • { Feet_ ' 3x � jc - � �jy ti rsfr ,y Prepared By: TKQA AND CITY OF SCANQIA �L 'a LEGGETTE,BRASHEARS&GRAHAM.INC. TILLER CORPORATION MINE f Professional Ground-Water and SCANDIA,MINNESOTA • G 8 Pine Tree Drive,Suite 250" Environmental Engineering Se ices TILLER CITY AOFGGREGAS TE MINE LOCATION ' C St Paul,Minnesota 55112 (651)490-1405 FILE: G3SCAND01F,MXD DATE:ANDIA, 04/28/2008 FIGURE Co 2 w I— 0' >- LEI (t) cc Cr D LU ° < 5 — 0— (3< z z 00 <z w < 8 O csi 5 1.1-1, cc_ -±- Ili ,,—0 2 c) fz( rt< D 7 t Z.3 o .. t., _ c.)z UJ L. ,... C)w< Fc E .-..- E E Z (%) Z.( 7 7. . C E E ,t_t to E 6 1 n g --- K 5, C) z '- ea ., 5. Z q L ,t, t ,.: E C '7E: ri c E F— LU 5 --1 z '.1 E._, t .,2 P- o 2 ts. ,.... E • '''''-'.. v 7:'`i ''.: CO < -e s_. ,., i---, < c.) z 9 g 7.: ' t 1- < c c., t., t., W .: '6 2 t5 ,., • .E, it .5 ;•_. zi .g I'-•2 E r— ..< \ ti .-.-',. ._C. E• 4 "g ,•'- ..,.. C.) ).....* '1-'' ' E 01 2 '3 E < = H =• ,• 8 cl) 4 >.., = P4 C Ot8--ite-: I r '-'''''''-'3-.'.'t•''''''''' '''''' V,,-- -i I- I .'''*.\ E.r.--,•,',.. ' A.. ' : ' ' . •,-?-,'-;':' ui c- '-'*:' - •4 .:' Sifi ' -'-"*.7--- = - 1 ' ' ' : ' ' ' ' **.'; ' :-' E- . , ,.. LI.. ' , Ili , '. (.7 E— E.,, , ,' '' "-,- ' _._ _ i_ 1 . . , % . , -.. - _ . . <V (.)• 2 Cl-0 (.7 c pa '''c 0 O ›; c --• 0,- 0)c 2 .,_. `r) 'c:n)tr- ATTACHMENT 1 SUNDE RESPONSE TO LBG DATA REQUEST LEGGETTE, BRASHEARS & GRAHAN1, Tiller 1) Please provide well logs for the Production Well, Scale House Well, PZ-1, PZ-2, and PZ- 3. What are their[WN Unique |D #a? The logs ofthe 0aet borings and the well logs on file at the MIN Department nfHealth for RZ'1. PZ-2 and PZ'3 are attached, The unique numbers are: PZ-1: 438181 PZ'2�48�18� � �^ PZ'3:438183 Note that the location of the piezometers. is incorrect on the County Well Index map. The log of the production well ioattached. The K8N Unique Well No. in108714 VVedo not have o copy of the scale house well. Both the production well and scale house well were installed by previous property owner. 2) What is the proposed well construction and expected depths of PZ-4, PZ-5, and PZ-6? Are these tobe completed in the sand and gravel? Bedrock? The wells are proposed to be 2"Sch 40 pvc wells and 10 foot slotted pvc screens with a plugged and. Filter pack will be installed around the screen to two feet above the top of screen,followed byabentoniVe plug and cement grout, A protective casing set inneat cement with locking cap will be placed over the Gapped well. |f any of the monitoring wells are in excess of fifty feel then a stainless steel screen may beuued used. � u- � We would propose to finish these wo||o in the Quaternary Drift, with ton foot screens intersecting the groundwater table. Because of the fluctuation of the groundwater table we would try to finish each well so that it intersects the upper two thirds of the ten foot screen. That way if the water table drops five feet due to seasonal fluctuations,water level measurements and samples would still befeasible. The depth will depend upon the final location of the wells, the surface elevation and estimated groundwater depths at the locations. 3) Are any of the existing wells completed in the bedrock or are they in sand and gravel? The piezometers and the production well are all completed in the sand and gravel, We ~/ do not know what the scale house well io finished in. / Two wells that were associated with the homestead in the eastern portion of the property were sealed in accordance with Minnesota Department o/Health rules. Both ofthese /~ wells were bedrock wells. Copies of the sealing records are attached (H243537and H1755O3). 4) Section D. page S. 8w paragraph states that Figure 5 illustrates locations of vvoUo/piozomotero and soil borings. The soil borings are not shown on Figure 5. Please provide a map showing the locations of the soil borings and provide the boring logs. A copy of Figure 5iu attached. The fourth soil boring io now shown. The soil boring locations are shown on this figure. The location or elevation o/SB 11 was not surveyed in at the time it was drilled, therefore the water table elevation is approximate only and the water table recorded to the nearest five foot interval. Information from the previous permit applications from the Dresel site indicated a water level of 916 feet above mean sea level (msl)at the Dresel site, so the information from SB 11 is consistent with other available data. A copy of the boring log for SIB 11 is attached. 5> Are the buildings on Figure 5, midway between the Production Well and PZ-11, the refueling area and asphalt plant? If not. please provide e map showing these site features and identify them aasuch. �' �� The buildings referred ho above are associated with the asphalt plant. Figure 5 has been revised to label the plant area. 8) Please provide historical groundwater level measurements from observation wells on site or adjacent to the site that have monitored byTiller. Tabulated values orwell hydvogrepho would besufficient. We are attaching a pdf of a,1 QR8 groundwater ir&es-tigation by Dr. Hans-Olaf Pfannkuch. This study was conducted in conjunction with the conversion of the wet scrubber pollution control system associated with the asphalt plant to a baghouse system which eliminated any wastewater discharge. Ao part uf the conversion, the wet scrubber discharge pond was removed under guidance from the Minnesota Pollution Control Agency(K4PCA), An investigation and the technical report was prepared and approved by the MPCA. The study contains historic groundwater level data from the three piezomehare. The &eohnioa' report concludes that flow directions near the plant area are in the northwesterly direction. As part of the study soil samples were taken to obtain laboratory values of hydraulic conductivity. Average bulk flow velocities were shown {uboun the order of35' 5Of/yoar corresponding to bulk travel time for 1 mile of100'15Oyears. Based onthis infnrmetion, it is clear that en on-site monitoring well network with properly located - monitoring wells will be able to detect impacts to groundwater quality long before any off- site migration o/impacts to residential wells could occur. The county permit did not require water level readings so a continuum of water level readings does not exist. The production well was fitted with a port in20U8to allow static �1 waterlevel di T 06. measurements of the production well and PZ-3 ave been taken since September 20 It should be noted that during the active mining season, the production well is utilized for dust control pumping anywhere from 15,000-25,000 gallons per day. This may have influenced some of the water level readings. Copies of the more recent water level readings are attached. 7) Are there survey data for the soil borings (i.e., grade elevation at the boring location when it was dhUed)? |f so, please provide. This will help determine/verify the accuracy ofthe groundwater elevations used 8u estimate flow direction. The location and elevation of the measuring point of the piezometers was surveyed at the time of the Phannhuoh report. | could not find any information m/odve to the surface elevation. Construction logs are included and the length of pipe above ground ionoted, 000 reasonable estimation can bemade. Tiller also surveyed PZ'3. the production well and the scale house well more recently as part of starting to take water level readings in2O0O. The survey information in Washington County Coordinates ioeofollows: rZ-o: X= 48Q11U Y=292OQ9 Z= 952.23 (at measuring point) ProducUonweU� well: ^/ X=488770 ~/ Y=292804 ~ Z=A42.08 (at measuring point) Scale house well X=498AG0 Y=2Q2GD1 Z=940.47 (top ofwell) 8) The EAW(Aug, 1999; Section 13)indicates the DNR Appropriations Permit Number for a 1R'nnui\e well (Permit No. 86'G1Q3. K4N Unique |D#168714). |u this for the Production Well or Scale House VVoUY Is there a permit for the other well? if so, please provide the ) permit Also, Tha�a|| �. � � . log for CVV Unique |O# 168714 does not indicate the name of the well (Production Well or Scale House VVo||). »*= * U The water appropriations permit io for the production well (unique# 188714). The scale house well is a potable well that does not meet requirements for an appropriations permit. p~ A) Are the drift and Prairie du Chien —Jordan aquifers hydraulically separated? If so, provide any site-specific data stratigraphic data and/or head data to indicate separation uf the two flow systems. We do not have site specific data to determine whether or not the two aquifers are connected or not. Review of well log data in the area is inconclusive. 10) The Carne|ian'N1arineVVote/ohed District(CK8VVD)completed o study ofGerman Lake (indicated nn page 4cf the April 21. 2ODO letter from Barr to Ann Tenwedo. Washington County). If this io available, please provide acopy? Were there any concluding statements as to the hydraulic connection between German Lake and the water table aquifer in this report? The CN1VVD should ha able io provide you with e copy o/their study. Attached ioomemo from Stu Grubb,with Emmons& Olivier Resources, Inc., consultants for the CMWD. His memo indicates that German Lake in perched. We know that the elevation of the groundwater table in the active mining area is around an elevation of 916 feet above msi. The elevation of German Lake, approximately 2,300 feet to the west, is at an elevation of approximately 954. For the two systems to be connected a rather strong west to east gradient would boaxpoctod ThePfannkvohn�vdydidnothnd �hix�obetheoaon� . v/ Hopefully the installation of PZ'5nviU be able to confirm the configuration of the water table in this area. In any event. the Barr study which evaluated the impact cfmining below the water table on German Lake assumed that the two systems were connected, This would be the conservative assumption to use in analysis of this nature, If German lake iuin fact perched, the impacts would be even less, There are oavem| isolated wetland basins it the area between the active mining limits and German Lake. These basins are perched above the regional water table, 3 NI2Uo0Ji�ir>1N0I LOCATION MINNESOTA DEPARTMENT OF HEALTH Minnesota Well and Boring H185135 Name WELL AND BORlNG.SEALING RECORD seaing No. Minnesota nesota Unique Wet ND. � WASHINGTON Mirwtesora Statutes,Chapter 1031 or W-series No. Or.ma,a r na lna+rf TOwnshlp Name Township No. Range No. Section No. Fraction Ism.-►lg.) Date Seated Dale Well or Soring Constructed NEW 32 20 7 SX NE ISW r, SEPTEMI3ER 10,2001 1980'S ftliangtill Addraas or Fire Number and City of Well or Boring Location 22303 MANNING TRAIL Depth Before Sealing • 18' It. Original Depth h. Show exact location of well or boring Sketch map of wall or bonny 91IreRfS) STATIC WATER LEVEL In section god with')•. N location. showing property Single Aquifer 0 Mulllaqurier fines,roads,and buildings, N WELL/BORING )Measured ❑ Estimated --+--_ _.^-I 1 ❑water Supply WIN%Mort.Well Env.Bore Hole ❑Other 17 S h. b&ow 1 � I ❑ — � 0 above land surlece yy,.;---4--- +----4-.-E CASING TYPE(S) ( _ LTT""' i h 0 Steel ❑Plaelic ❑Tile ❑Other I .i I nmsa CASINO • I 1 I. Diemeter2ar 0 Depth S Set in oversize role? . Annular space inllety Grouted? Ili,—r mue In.Porn to h. ❑.Yes I]iNo El Yes ❑No ❑llrwrtown TIMEvi iW 0 1 }Vy.�,•T"''�� in.from ._ to h. ❑Yes 0 No 0 Yet 0 No 0 Unknown _A;r14141.1/111MelltillifigkONIferont than well location address Indicated above. In,from - to h. ❑Yes ❑No ❑Yes ❑Na 0 Unkrtowo '120011EML0CR LANE,SUITE#200 SCR£ENIOPEN HOLE P.O.BOX 1480 a MAPLE GROVE,MN 55311-6480 Screen from 8 to 18 n. Open Hole from to OBSTRUCTIONS '�: �INER'S NAME op Pipe ,..r- ❑' 0 Check Valve(s) 0 Debris ❑Fil %No Obstruction „ .. .' WaS.ownera malting address II diderent than property owners address Indicated above. . Type of Obstructions(Dasatbe) - Obstructions removed? 0 Yes ❑No Describe • PUMP NONE Type GEOLOGICAL MATERIAL COLOR HARDNESS OF FROM TO 0 Removed tyt.Not Present ❑ Other - • FORMATION if riot known,Indicate estimated formation lop tram-nearby well or boring. METHOD USED TO SEAL ANNULAR SPACE BETWEEN 2 CASINGS,OR CASING AND BORE HOLE: a interGR r L'•n I o Ann tar Space Exists SANI�f 0 5 LI An Naar apace grouted xllh treuNe pipe IS SAND 5 10 E)Casing Perforation/Removal FINIn.from to -. _ fL ❑ Perforated ❑ Removed SAND/GRVL .O 18 In.horn b ft 0 Perforated- ❑ Removed Type of perforator • -__,❑ Other ...'' . - - GROUTING MATERIAL(S) (One bag of cement=84 lbs.,one beg of bentonite-tie lbs.) Grouting Material PORTLAND from 18 to h. yards 1 begs - _ from _ -- to _.._ h. yards bags from to ft.__ yards bags from to— h..: yards bags REMARKS,SOURCE OF DATA,DIFFICULTIES IN SEALING OTHER WELLS AND BORINGS R.EMARK.S: Other unsealed and unused well or baring on property? ❑Yes ®No How many? GEOLOGY FROM; New SOandIa Trip,test boring. LICENSED OR REGISTERED CONTRACTOR CERTIFICATION 1, WATER LEVEL IN ABOVE WELL: 9'i' This well or boring was sealed In accordance with Minnesota Rufes,Chapter 4725. The Inlormatiun contained in the tenon la DATE WATER LEVEL TAKEN: 01108J8S True to the best of.my knowledge. E E.H.RENNER&SONS,INC 'r 101.5 License orReistrebon No. liee�� According�. to MN State Regulat ions c``` �� AuUodt.dAp�r �eWe�nerwe -�� a ter.^^ �L�t�x1)4�1�,2001 Date , _.. , KEVIN HOPPE /KEVIN SC'HEITERLEIN LOCAL COPY H • 1 85135 Name or Person Sealing Well or Boring . '1- ''1` - -..._ - - ' • " . . _ MINNESOTA DEPARTMENT OF HEALTH Minnesota Well and Boring H 175503 . WELL OR BORING LOCATION County Name WELL AND BORING SEALING RECORD 11,- s'.nnesp'Nta°'UniqUeln- tgo774 , wAsHINGTON . Minnesota Statutes.Chapter 1031 or W-stirrie,4#g,..,6_, II woe[Ink V not ..... 5,,,. • .......1.'..i.a...•,---"-....,,,, TiciwName 'Township No Range No Section No 6racriorr(sm.iiitli Date Sealed Dare Wee TBowig Constructed 32 20 8 SCANDIA 1 Eu SK OCT 10, 2000 1950'S Numerical Skeet Address or Fee Number and City of Well or Bonny weapon 97 7 1 , 22540 LOFTON AVENUE Depth Before Sealing h. Original Depth ' 11 Show exact location of well or boring Sketch map ol well or boring AQUIFER(S) STATIC WATER LEVEL in section grid with"X'. N kw........ showing Properly gii Single Aquifer 0 Mditrequiler lines,roads,and buildings. 'F- N WELL/BORING X Measured 0Esrurated fluff I o'.,) ,...% ww.i.,Soppy wee 0 Morl.Well a Env.Bore Hole 0 Olher A ,-, It. R below El above land surface W Urn"E CASINO TYPE(S) "" elo.L-•• ,4-' 1 t.....__ 1::!' .5%1111 Steel 0 Plaalic D Too. 0 Other E L. • J -. , CASING(S) golf. i . Diameter Depth Set in oversize hole? Annular apace InIttelly wooled? • 4 0 94 s E • i., I mlle---,A% . in.kern to n 0 Yes VI No D Yee El No a Unknown CO P RATION PFFh4FITY OWNLERER'S_NA/ARE_0 In_from to It 0 N Yes 0 . 0 Yes D No 0 Unknown Property owner's thawing plaints,a coherent than well iocarlon address indcated above. in,from in Jr. ID Yes 0 No n Yes E]No a Unknown - 10633 89TH AVENUE N SCREEN/OPEN HOLE MAPLE GROVE, RN 55369 Screen from 94 to 97 h. Open Hole horn to h. . OBSTRUCTIONS .'-- - WgIANR.$NAME 0 Rods/Orop Pipe 0 Check Valve(s) 0 Debris 0 Fig )6 No Obslruclion 41 Wog(MT'S mailing address-il diflerent than propony ownneg address Indicated above. Type ol ObstruCtiOnS PeSedbe) 47 • • '...•:'—' 4.- ,, , , .•,,...• Obstructions removed? 0 Yes 0 No Describe -, PUMP • SUBMERSIBLE Type HARDNESS OF 0 Re mov IA Not Present 0 Other GEOLOGICAL MATERIAL COLOR FROM TO FORMATION METHOD USED TO SEAL ANNULAR SPACE BETWEEN 2 CASINGS,OR CASING AND BORE HOLE; II not mown,Indlopte ontirneted formation log learn nearby wen or boring. 11:No Annular Space Exists CLAY BROWN 0 32 _ u Annular space grouted with irernie pipe SAND/CLAY 13ROWN 32 89 D Casing Perforation/Removal SAND/GRAVEL BROW 89 102 In.from to II n Pertoraled D Removed EAU CLARE OREM 5 550 in.from to _ ti. 0 phorated 0 RerrnTved Type ol perlorator CI Other . --- ... GROUTING MATERIAL(S) (One bag of cement.94 lbs.,one bag of bentonite f•5(1 tbs.) - PORTLAND 47 o 1 , _____ Grouting Materiel frorn to ft. yards _ baps 1 ,-.-- ._____ from to II. yards ___ bags _ from _ Is ft. yards begs . r from to_ It _ yards _________ bags — . i ___ . . . i. REMARKS,SOURCE OF DATA,DIFFICULTIES IN SEALINO OTHER WELLS AND BORINGS GEOLOGY FROM: 15000 SCANDIA T" '•'18',ans. t.and unused well or boring or,property? Yes 110 No How many? i LICENSED DR REGISTERED CONTRACTOR CERTIFICATION WATER LEVEL IN ABOVE WELL: 16 DATE WATER LEVEL TAKEN: 07/23/k VI' e jS tow rho seated with Minnesota Rule s.Chapter 4z2S. The Information contained In this report 13 • MAP CODE / MVIM—2 A E.H. RENNER & SONS, INC. .. 71015 4 Convector Ei 1 Nemo license or Repisitation No. Accordino to MN State Rep:uiations 0 Authorized Representallv , Ignature ORM KEVIN SCHEITERLEIN/KEV/N HOPPE l:, . Pc1{;*:-Val.,',.•.! ti:,' 1:- '--:"...'-'7'.i'...''C' H ,755.03 , Name of Person Sealing Well or Boring . P-1,i..ris-.+Aa .,-,:wi-;.;:.----(c c-,1,•-v WELL OR BORING LOCATION MINN $OTA DEPARTMENT OF HEALTH Minnesota Well and Boring H 24537 County Nam WELL AND BORING SEALING RECORD Sealing No. Minnesota Unique Well No. •3 Minnesola Statutes,ChaPter 1031 OT W-series No. i q 70 Washington, Pete blare II rol Mame .., Towrohlp Maine Township No. Range Na. Section No, Fraction(gm+Ig) Date$etifed Date Well or Boring Cons-hooted New Scandia 32N . 20W 8 SE SEANW February 8, 2006 November-15, 1983 CiPS Latitude—degrees minutes seconds 125 LOCATION: Depth Etetore Sealing 120 ft. Original Depth ft Longitude degrees minutes seconds PouipER(s) STATIC WATER LEVEL . Numerical Sheet Address or Fire Number and City of Well or Boring Location 0 Single Aquifer lia"Mulliaquiter 22540 Lofton Avenue North WELLIBORING R'Messurod 0 Estimated gWater Supply Wet 0 Mond.Well Show exact location of well or boring Sketch map of well or boring . In section grid with'X' location,!Plowing property 0 Env.Sore Hole 0 Other 48 ft. , 'be low 0 above land surface Ones,roads,end buildings N CASING TYPE(S) --4------i----1----4-- ,41.,1-fA I , i g Steel 0 Plastic 0 The 0 Other - 4- -i- ----L-..- ----4--- w i E V WELLHEAD COMPLETION • -4.---!--.---t----4----1- Outsider 0 Well House Inside: 0 Basement Offset i i i I Once , Riess AdeplerAhit 0 Well Pit „... . 0 Wel Ph 0 Buried Ile--I ra4. + D Burled PRI:SPERTY OWNERS NAME/COMPANY NAME CASING(S) Tina Corporation Diameter Depth Set In oversize hole? Annular space initially groused? Property owner's malang address ildnetent than wet location address Indicated above 4 In.from 0 le 117 ft, ,igivo.., 0 No El Yes WO 0 Unknown P.O. Box 1480 in.from _ to R. 0 Yes 0 No D Yes 0 No D Onknovni Maple GITIVO, MN 55311 In.from to ft. EI Yen 0 No r]Yes ,D No El Unknown WELL OWNER'S NAME/COMPANY NAME SCREEN/OPEN-HOLE game --- .. Well owner's mailing address it Moen,than property owner's address indicated stove — Screen from to ft. Open Hole from 117 10 I 2° IL . • ' OBSTRUCTIONS .7... 0 Reda/Drop Pipe 0 Cheett Valya(s) El Debris 0 Fill _RI'No Obstruction ,-.i i.., '',.!... •" .. . Type of Obstructions(Describefi,'L '--'. --, • . , .. GEOLOGICAL MATERIAL COLOR HARDNESS ORFROM TO Obstructions removed? D Yes 0 No Describe FORMATION PUMP 'If not hnown,Indicate essl milled formation log born nearby wen or boring . Subinee Clay 0 12 Type Lbibl . pr Removed El Not Present 0 Other Clay&Gravel . 12 63 METHOD USED TO SEAL ANNULAR SPACE BETWEEN 2 CASINGS,OR CASING AND BORE HOLE: _ Clay 63 95 12C No Annular Space Exists D Annular space grouted with'mode pipe 0 Casing PerloretIonmemovai ..1, Boulders&Gravel ' 95 105 In.from, . . to ft. 0 Perforated 0 Removed _ - Lirneroqc Sandmk 1.05 125 In.from to ft. 0 Perforated 0 Removed Type of perforator 0 Other_ • GROUTING MATERIAL(8) (One bag of cement L.-94 tbs.,one bag of bentonite w SO lbs.) * _ . Grouting Material__Not Cement Iron) 0____ to 120 ft yards 8 ._.. bags __ from_ _ .lo_ ft yards . _ bays frorn.:_. In ft, yards bags OTHER WELLS AND BORINGS REMARKS,SOURCE OF DATA,DIFFICULTIES IN SEALING Other unsealed and unused well or boring on properly? 0 Yes , No How many? . Geology From: UN ii195708 LICENSED OR REGISTERED CONTRACTOR CERTIFICATION Map i.-..ode: MIVIM This well or boring was sealed In eccxxdance with Minnesola Rules,Chapter 4725.The information contained Sri this report Is true to the best of my knowledge. C' r i ii_„ ,... ,,_.„ r.., ',..,`''' •; V E.H. Renr)er&Sons. , IL015______ 'A L..,N --. 1.:, v Cord aaltoanose Name License or Regrstration No. e6:,R fv,,I, :lr''''IC' ACGOrding to MN State, „dt.0,,, „„,,..........,, Authorized Representative Signature Dale 02109/06 LOCAL COPY H 243537 Kevin Scheiterltin Name of Person Scaling Well or(kiln . - -- DP2-2 GROUNDWATIER FLOW DIRECTION PRODUCTION FROM 1088 STUDY WELL PZ-3 HOTJA1X 818 78 916 96 PLANT AND 41it REFUELING MEA •. s . iiw. l- WELL 10* 0 P2-1 (Abndond) 917 OD C\ '' PROPOSED LAKE PROPOSED WANG 0 \ LIMITS - /) PROPOPSEO WELL PZ-5 1.19 ) I Z Q5 \,....„......._ . . i / •:,--1 a \\) , I 'UPGRAOIENT" ) 1.N.---..._ WELL'PZ-4 ---... NOTE : Water level of SBI I is 7- 5 feet. Soil Boring -{1 location and surface elevation is approximate only. MONITORING WELLS GROUNDWATER CONDITIONS FIGURE 5 Revised 4/21/08 ` | LOG OF TEST BORING . . . . ' 4220 88 Z14VERTICAL 1�pa �z - uoxLc 1" = � BORING NO, PROJECT Groundwater StVd» - Sand & Gravel Site - New SC8ndia Township, Minnesota � DEPTH DESCRIPTION OFMATERIAL oAwr�s TESTS' IN � msoLoe/o — ' FEET �~ooRpw:E �Ev«rmw mRmw w wu NO, rvpm w Cm7x[C ow ` �_ -- .�~ _ SANDW/A LITTLE GRAVEL, fine to COARSE 1 5B medium grained, brown, moist, ALLUVIUM frblen to medium dense ~/SP/SP3�� - ` / ' ~ - 9 2 SB 1 X 10-2 MA ' - 1O- 3 3 3B � X � - ~ 4 4 �D G X 1O~2 MA ` SAND W/SlLT (See �1 ) ��P-�M\ - 6j . . ^ ' ' SAND, fine (�8e #�\ (SP\ ' 5 5B 2 7� ' c- / ` / 8 X 1U- ~ ~ SAND 0/A LITTLE (See #3) (8P) - 75 O 3B 9 - M 2 10 - SA`', ' '' = `^== �4\ /3pI 7 SB X 0 - SAND W/SlLT AND'GRAVEL, medium - 32 8 33 grained, brown, waterbearing, ' very dense to medium dense 3- ' 1h � 3B 5 X 1O- MA /3P~3Ml - � 13 10 S8 ' 18 - ` - End Of Boring - _ #1 - AND GRAVEL, medium grained' _ brown wet, very ^ , ry loose - (SP-SM) - - #2 - grained, brown, moist, ' - medium dense (3P) ' _ #3 - GRAVEL, medium to fine grained, _ brown, moist, very dense _ (Sp) #4 - grained, brown, moist to 9/ ` ' ' than waterbearing,'- dense - | /�p1 . ` ' *Rates shown are only estimates . ^ � - ` � ' Note Piezometer installed in bori n - . ' �. - See attached "Installation of PieZommtero - data sheet !- . -4 -- � ` - ! | | - - ^ ^ ` w^�vn�em� mc�noxcmcwns xr�n� 1-8-88 cuw��src 1-8788 � - ` SAMPLED C&SING mwpm WATER H5A 0'-18/ 10�3O DATE TIME DEPTH mcn" u^u�o�T~S_ LEVEL METHOD - � -f��i . . ' / o 10 15._- 'r � �- ° �� -l-y 1 /" - NMR__-- � No * mu°CH/cp White -- twin city testincl SE(7743�5 i LOG OF TEST BORING JOB No. 4220 88-214 VERTICAL SCALE 1" " 5' BORING NO. 2 PROJECT Groundwater Study - Sand & Gravel Site - New Scandia Township, Minnesota DEPTH DESCRIPTION OF MATERIAL SAMPLE LABORATORY TESTS IN GEOLOGIC K�F* FEET rSURFACE ELEVATION ORIGIN N WL NO. TYPE W CMISEC Qu SILTY.SAND W/A LITTLE GRAVEL, fine COARSE 1 SB 5 X 10`4 grained, brown, moist, frozen to ALLUVIUM 21 - medium dense, (See #1) (SM) -. SAND W/SILT AND A LITTLE GRAVEL, - 11 2 SB 2 X 10`3" fine grained, brown, moist medium - 5 dense SP-SM)� _ SILTY SAND W/A LITTLE GRAVEL, fine 6 3 SB 1 X 10-4 7 ' grained, brown, moist, loose (SM) SILTY SAND W/A LITTLE GRAVEL, brown, TILL OR - 7 4 SB moist, loose to very loose, a few COARSE _ 2 X 10-5 MA lenses of sand (SM) ALLUVIUM _ . 1 5 SB 12 - - CLAYEY SAND W/A LITTLE GRAVEL, TILL OR r 1 IF 6 SB HYD brown, soft, a few lenses of lean MIXED _ 5 X 10� _ clay (SC) ALLUVIUM r- 1 7 SB 19 - _ SAND W/A LITTLE GRAVEL, medium COARSE grained, brown, (See #2) (SP) ALLUVIUM 30 8 SB 8 X 10-2 NO SAMPLES TAKEN. _ n — F- #1 - some lenses of sand (SM) #2 - waterbearing, dense (SP) - #3 - brown, wet, very dense (SM) - _ Note: Piezometer installed in boring. See 'attached "Installation of Piezometer" - - data sheet - 34z_ SILTY SAND W/A LITTLE GRAVEL, a TILL OR — 36 __few cobbles, _CSee #3) (S�1) COARSE* 47 9 SB End of Boring *ALLUVIUM _(k*Rates shown are only estimates _ WATER LEVEL MEASUREMENTS START 1-8-88. COMPLETE 1-8-88_____ _ C I N DATE TIME SDI DEPINH DE TH BAILED DEPTHS LEVEL METHOD HSA 0'-341' PTHD 12:30 1-8 12:10 21' 191' 18' Io 14'— . 1-8 12:30 __36'__ _ 34;' 344' 1,. 292' _ 1 a__ 2.;.4.5 __Kt_ 3 4- ' • __ 4 -' IO 13' ry--------— 1 8 3:00 ee No a to CREW CHIEF White twin city testing SE2(77.145 Corpordbonl v-4 ` . . ` . . LOG OF TEST BORING ' ^ . " JOB NO, 4220 88-214 VERTICAL c aon/mo wo� 3 . Ecx Gr'oundwater Study - Sand & Gravel Site � N�� SCaAdia Township, Mi�nes0ta �' ^ _ ^ nspr" DESCRIPTION orMATERIAL a^wpLs LAoonATpnv`us`s ' r — ~ �� GEOLOGIC w � .mn-r,� � - � � �u" — ' ORIGIN CM/SEC ^ SILTY SAND W/A LITTLE GRAVEL, fine COARSE ' 1 `H3A _ to medium grained, dark brown to ALLUVIUM 5 X 70-4 MA brdwn, mV1st, frozen to dense, a ' ' few lenses Of Sand /3M/Sp-3M\ ' 2B 2 8B ' . ' 5� - -- 1Z 3 3B _ SANDY LEAN CLAY W/A LITTLE GRAVEL, TILL - _ reddish brown, rather stiff to ' 1 X 10-7 stiff /CLl � ' ' ' 27 4 3B 9 ^ � l X 10-5 _ 3ILTY SAND W/A LITTLE * GRAVEL, red- Uish brown� moist, medium dense a 14 5 SB MA � 11�[ few lenses'of silt and sand (3M/ - -- ` G X 10-5 - SILTY SAND, fine grained, light COARSE ' - brown, ist, dense, lenses of ALLUVIUM - 19 6 3D 14 ` --- ___. /3M\ _ | - SAND W/Gruv .l , medium _ — grained, brown, moist, dense to _ 17 7 SB ' medium dense to very dense - (5P) ' ' 8 X 10- 2 9 8 8D MA - - , ' - > � ' \ - - 25- -- -- -- - - Continu*d on Next Page � - - � - ! � - ( _ *Rates shown are only estimates. � - - . - - _ - ' - ' - - - - � - - - ' � ' L | ' tuUUn citY testKncl uanyo^ corpora 5 '! LOG OF,TEST BORING JOB NO. 4220 88-214 vsnn "c»� ac^�� 1 = 5/ BORING NO. 3 (Cont. ) � ' ' Groundwater Study - Sand & Gravel Site - New 5candia Township, Minnesota _PROJE.CT DEPTH oenc��mworw�rum�L uAwp� ma��onv��o � IN mNo��/p Ka omo/w n wL wu `vps w qv FEETs�v.�rmw . _ _ CM/SEC ^-_-- ' 25 S AND W/QRAVEL (Cont. COARSE 38 A 3B NSR8 X 10- 2 / ' SP) ALLUVIUM 27 - (Cont. ) ' _ SAND W/5ILTAND GRAVEL, 0edYmn - grained, brown, moist to 331/ - then waterbearing, dense (SP-3M) _ - 23 10 S8 - - ' - 5 X 10- 3 � ' L - 17' 11- 5B - .- ' ' ^ - � -23 ' 12 SD MA ^ ` - , ~ - 44 - _ End of Boring _ - ' - Note: Pieznmeter installed in borinc. � - See attached "Installation of PiezVmeter" - _ data sheet, r ' ' - *Rates shown are only estimates. ' - - ' ~ i " ` ! - - i - ' - ' � - - .. _ _ - - - ! - - ! ! - - ' ! WATER LEVEL msAnunsMswro or�nT 1-1�-8O compLeTc � SAMPLED CASING CAVE-IN WATER 41 DAT _. . 1 11 � 1 f'11 -- cxa°om�, White ___J_--'_ �------'�------�---' ' --� -- ----- � ' -- twin cUtY testUnq � INSTALLATION OF PIEZOMETER 1 fosAo. . 4220 88-214 PIEZOMETER NO. 1 GROUND SURFACE ELEVATION- TOP OF RISER PIPE ELEVATION (with cap removed) VENTED CAP a a I 1.1 PROTECTIVE CASING ' a • 4" Steel v •Nom, Nur .. 4,11 ,,‘ T0147Lter Int!Type .. v ir ‘!,r1 i .-", IA 2.8' A Length Abow Ground 14141 ' A— 0' to 5.2' Grout THICKNESS AND TYPE OF SEAL (Cement) I 1 2" PVC I 1 DIAMETER AND TYPE OF RISER PIPE Well Casing L2 1 l TYPE OF BACKFILL AROUND RISER N/A 1-4 1 161 -7- 5.2' to 6.3' _THICKNESS AND TYPE OF SEAL Bentonite Powder \. • DEPTH TO TOP OF FILTER SAND 6.3 • .. ,:T to ti.V°41eilliUtind a i .1, TYPE oF FILTER AROUND SCREEN Soil . TYPE OF PIEZOMETER PVC , .. -: ;L• SCREEN GAUGE OR SIZE OF OPENINGS #1 0 S 1 Ot L3 (SLOT NO.) 2" X 10' DIAMETER AND LENGTH OF SCREEN -' 11?':: • 16.5' DEPTH TO BOTTOM OF PIEZOMETER .:...f.--....4 ' \74*-- DEPTH TO BOTTOM OF FILTER SAND 18.0 4 a ; \ ' —THICKNESS AND TYPE OF SEAL None al.\\ 7" 11 'I DIAMETER OF BOREHOLE ' L = 1 2.5 FT 9.0 FT L2= PIEZOMETER WATER LEVEL MEASUREMENTS ----" 10.0 DATE TIME BAILED DEPTHS WATER LEVEL (1) L3-- FT 1 Lir 8.0FT , INSTAkLAIRN COMP LETOpii5 Date ' Time ' ' (1) DEPTH BELOW TOP OF RISER PIPE L 1 twin CILY testing - SE•24 (33-a) corpora:on A-7 INSTALLATION OF PIEZOMETER JO NO, 4220 88-214 PIEZOMETER NO. _______ 2 GROUND SURFACE ELEVATION• TOP OF RISER PIPE ELEVATION (with cap removed) I VENTED CAP LI PROTECTIVE CASING " Diameter and TYP1 4 Casing v 'r°7 •.v 47‘- 4i I /A\ Total Length 5.0' , 1 Length Above Ground 2.8' ._. 0' to 6.3' Grout THICKNESS AND TYPE OF SEAL I (Cement) I 1 DIAMETER AND TYPE OF RISER PIPE 2" PVC Well Casing L:s I I TYPE OF BACKF ILL AROUND RISER N/A I-4 1 tZ ,C.--"— 6.3' to 8.2' N‹ —THICKNESS AND TYPE OF SEAL Bentonite Powder ' DEPTH TO TOP OF FILTER SAND 8.2' •:—... : #1630 Silica Sand to - .• . , ... ....?".•:• TYPE OF FILTER AROUND SCREEN 20' then Native Soil . TYPE OF PIEZOMETER PVC ., •. SCREEN GAUGE OR SIZE OF OPENINGS L3 :. . .zi. (SLOT NO.) #10 XSlOt 10' ., .... DIAMETER AND LENGTH OF SCREEN . • . .,. :V.:•.; --J-- --"L%-;: DEPTH TO BOTTOM OF PIEZOMETER 20.0' ..•.--y. DEPTH TO BOTTOM OF FILTER SAND 36.0' ^THICKNESS AND TYPE OF SEAL None 14 —I DIAMETER OF BOREHOLE 7" 2.5 Li= FT 12.5 L2. FT PIEZOMETER WATER LEVEL MEASUREMENTS DATE TIME BAILED DEPTHS WATER LEVEL 1,) L3..= 10.0 FT . _ 36.0 Le FT _ _ INSTAk.LEITAir COMPLETED J:00 Date J Time (1) DEPTH BELOW TOP OF RISER PIPE tUJI1r1 CItY 0• il 0 5 E.2 4 (113-6) imoimmomn A-8 INSTALLATION OF PIEZOMETER MNO. 4220 88-214 PIEZOMETER NO. _________ GROUND SURFACE ELEVATION TOP OF RISER PIPE ELEVATION (with cap removed) ,, VENTED CAP 1,.., LI I PROTECTIVE CASING 4" Steel Diameter and Type ,/ ii '14\ Total Length 5.0' it Length Above Ground 2.8' 0' to 15.7' Grout S 1 LTHICKNESSANDTYPEOF SEAL (Cement) IDIAMETER AND TYPE OF RISER PIPE 2" PVC Well Casing L2 1 . a N/A TYPE Of BACKFILL AROUND RISER . I-4 1 g 7- 15.7' to 17.4' 41% N —THICKNESS AND TYPE OF SEAL Bentonite Powder b N\ 17.4' DEPTH TO TOP OF FILTER SAND : lir.-- TYPE OF FILTER AROUND SCREEN Native Soil Of PIEZOMETER PVC • 'e--:--SCREEN GAUGE OR SIZE OF OPENINGS #10 SlOt L3 (SLOT NO.) 2" X. 101 '. DIAMETER AND LENGTH OF SCREEN ... ... D.' .. ‘ 42.0' ..11,* DEPTH TO BOTTOM OF PIEZDMETER . . , .. ' ,—DEPTH TO BOTTOM OF F ILTER SAND . 44.0' • —THICKNESS AND TYPE OF SEAL None i 2.5 I. d DIAMETER OF BOREHOLE 7" , L 1-- FT • L 34.5 FT PIEZOMETER WATER LEVEL MEASUREMENTS -7.- 2 - DATE TIME BAILED DEPTHS WATER LEVEL (1) L3. 10.0 FT S . L4. 44.0 FT INSTALLATION COMPLETED: . _ Date 1-11-88 Time 12:45 (1) DEPTH BELOW TOP OF RISER PIPE twin city testing sE-24 te3.8) corporation A-9 Well Log Report- 00168714 Page 1 of 1 M inneso$a Unique WelJNo. MINNESOTA DEPARTMENT OF HEALTH County Washington WELL AND BORING Entry Date 03/01/1989 168714 Quad Forest Lake Update Date 05A16/1996 Quad ID 134C RECORD Received Date Minnesota Statutes Chapter 1031 Well Name H&S ASPHALT Well Depth Depth Completed Date Well Completed Township Range Dir Section Subsections Elevation 958 ft. 98 ft 98 ft. 05/02/1980 7.5 minute 32 20 W 7 ADDCAB Elevation Method topographic map Drilling Method Cable Tool (+/-5 feel) Drilling Fluid Well Hydrofractured? ❑ Yes ❑ No From Ft. to Ft. Use Commercial Casing Type Steel(black or low carbon) Joint Welded Drive Shoe? El Yes ❑ No Above/Below 1 ft. Casing Diameter Weight Hole Diameter 16 In.to 69 ft. lbs./ft. Well Address Open Hole from ft. to ft. Screen YES Make JOHNSON Type stainless steel SCANDIA MN Diameter SloUGauze Length Set Between Geological Material Color Hardness From To 10 30 31 69 ft. and 98 ft. SAND&GRAVEL BROWN 0 98 Static Water Level 20 ft. from Land surface Dale Measured 054 0 2/1 980 PUMPING LEVEL(below land surface) 42 ft. after hrs.pumping BOO g.p.m. Well Head Completion Pitless adapter manufacturer Model ❑Casing Protection ❑ 12 in.above grade ❑AI-grade(Environmental Wells and Borings ONLY) REMARKS Grouting Information Well Grouted? El Yes ❑ No M.G.S.NO.1549. Grout Material: Bentonite from 0 to ft. 0 Located Minnesota Geological Survey Method Digitized-scale 1:24,000 or larger (Digitizing Table) Unique Number Date N/A Verification Information from owner Nearest Known Source of Contamination System UTM-Nad83,Zone15,Meters X: 509586 Y: 5013590 _feet _direction _type Well disinfected upon completion? ❑ Yes I] No Pump =1 Not Installed Date Installed 06/20/1980 Manufacturer's name JACUZZI Model number 10MSA5 HP 40 Volts a Length of drop Pipe 50 ft. Capacity 60D g.p.m Type Turbine Material Steel black or low carbon) Abandoned Wells Does property have any not in use and not sealed well(s)? ❑ Yes ❑ No Variance Was a variance granted from the MDH for this well? ❑ Yes ❑ No Cuttings Yes Well Contractor Certification First Bedrock Aquifer Quat.Water Table Aquifer Renner E.h.&Sons 02015 LEDBETRTER,B Last Strat Sand&larger-brown Depth to Bedrock ft. License Business Name Lic.Or Reg.No. Name of Driller County Well Index Online Report 168714 Printed 4/21/2008 HE-01205-07 mhtml:file://1\kirstensne\mv documents\Tiller- all\Tiller New Scandia\Well PDF's\Well 1,... 4/21/2008 C 15 L. 0 ....... CD ,- <- N I' CO Nt OD <- • C W tiM 4-.. 00 co oo r- Lo ul GO cc N Do 15 >413 ft 4i 4i Ni NI: Ti '1: Ni 1 i Ni Ni .c2 ,....... II " ° C) C•I C\1 •,— C.) 14-) 0) N ..., „ CO r.•.• N. N-. 2 2 0S 06 tn C) C) C") 0,-) C") tn o c") coa ....... , 0) . w 0 Lco •cr 0 Ur) c, 0 LO cp c> LID ... E `-' •- "- (1) o.) c f= , -- CD N.-. r- N- r- r- r- r- OD CC co CP CA C M C? 9 C? 9 CD C? C.? 9 C? CD 9 CC.) 0 CO :". 0 (I) 2 ---3 i U) s•-•.' Z a --) 1.1. 2 , , a) c\I ") ,---- ,- ,- 00 04 CD N CO 0 0 CO '- Y••• "-- Y- N N E 1- a r- 4t iri ,_ o r.-- co LID r.- 0 Nt c) co a to 1-- r '..--.' UP OD CO 47 NI" Nr 1.0 CNJ V- CD 00 ti a) . . . . . . . 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Cdr 77,0 r-Vw, ,romi 1 1 rai (,) 1110 k= 1160 If) fr-e- © • BartonL, Sand Gravel o. 10633 89TH AVENUE NORTH OSSEO,MINNESOTA 55369 TELEPHONE: (612)425-4191 March 9 , 1988 A Mr. Jim Strudell -N, vi; 14 Division of Water Quality Minnesota Pollution Control Agency ‘4, f‘ I 520 Lafayette Road St. Paul , MN 55155 ) • Re: Groundwater Study Plan New Scandia Township Dear Mr . Strudell : In accordance with your request, enclosed please find the Revised Groundwater Study Plan for our New Scandia Township operations . This plan has been prepared by Dr . Hans-Olaf Pfannkuch, Professional Hydrogeologist , American Institute of Hydrology, AIH Certificate No. 646 . This plan is a revision of our Groundwater Study Plan dated November 17 , 1987 . It is based on findings about the general geology and hydrology of the site obtained by field work on the site , interpretations of the data, and specific points raised in various discussions with MPCA staff and company representatives . The plan is divided into two parts , the first of which consists of the recommendations based on current field work and earlier studies . The second part is a technical report dealing with the field work carried out at the site and its analysis . After you and any other appropriate MPCA personnel have had a chance to review the revised plan , please contact me so that we can again schedule a meeting to sit down and discuss the new plan and procedures with you. Thank you for your consideration and cooperation in this matter . Yours very truly, Susan B. Turner Enclosure SBT/lkr Producers and Suppliers of Crushed and Washed Gravels . a . . November 2007 Updated with submittals through May 1,2008 -: -, '..' ,,:;'' '' T:, ,.,,,,, CO ORATION CONDITIONAL USE PERMIT APPLICATION TO THE CITY OF SCANDIA FOR MINING AND l LATED ACTIVITIES iStiWee\ . . Consulting Civil Engineers Sunde Engineering,PLLC 10830 Nesbitt Avenue South • Bloomington,Minnesota 55437-3100 Phone: (952)881-3344 • Fax: (952) 881-1913 • E-Mail: info@sundecivil.com APPLICATION FOR CONDITIONAL USE PERMIT TILLER CORPORATION SAND AND GRAVEL MINING OPERATION CITY OF SCANDI/\ VVASH|NGTON COUNTY, K4|NNESOTA i INTRODUCTION The following permit application is submitted on behalf of Tiller CVrD0[@d0n in compliance with the City OfScaOdia'S Ordinance No. 103 and Chapter 4 Of the Development Code: Mining and Related Activities Regulations adopted by the City of SCaOdiG OD August 28. 2007. Tiller Corporation 0vvn8 and operates 8 gravel mining and processing operation within the City of SC8ndi8. The site has been actively mined since at least 1966. Prior to the incorporation Of SCandio in 2006' New SC8DdiG Township and Washington County were the permitting aVthOriUoa, first issuing permits in the |8<e 1980'S. Permitted activities include the removal and processing of eggrmQ8te, the production of hot- mix asphalt and the recycling of concrete and asphalt products. Final product is sold |DC@|/y. The operation is located on approximately 395 acres, Df which a total Vf155 acres will be mined and reclaimed 8t the CODC|u8iOn of the mining operation. Environmental review for the mining faci|ity, in the form of an EOVi[Onrn8nt@| ASSe8SrneDt VV0rk8h8Ct (EAVV). was C0nlp|8t9d in 1987 as part of the initial permitting process. A second EAVV was completed in 1989 due to revisions to mining limits. Mining limits were revised by adding areas to be mined to the eastern Side of the property and removing areas to be mined that were more environmentally sensitive On the w/8St9[n Side of the property. The scope of operations and mining limits proposed in this permit application are consistent with the scope of Op8[@tiOOS and mining limits reviewed in the 1999 E/\W. || SITE |NF(}F|K8AT|[)N 1. Name and address Of Op8[at0[ and OvVDC[ of the land: Tiller Corporation 7200 He[D|0Ck L3D8, Suite 700 P.O. Box 1480 K4@p|8 G[Ov8' MN 5531 1'6480 2. An accurate legal description of where the mining shall OCCU[: The legal description of the site is included as Attachment 1. 3. Names and addresses of adjacent property owners within % mile of the perimeter of the area being or to be mined: A list of Tax Parcel Identification Numbers has been supplied to the City. The City will obtain a list of all property owners within a % mile of the perimeter of the property from Washington County. 4. A narrative outlining the type of material to be excavated, mode of operation, estimate of amount of material to be removed, plans for blasting, estimated time to complete the removal, and other pertinent information to explain the request in detail: The mining operation includes removal of overburden, excavation of sand and gravel, crushing, washing, screening, stockpiling, recycling of concrete and asphalt products, the production of hot-mix asphalt and reclamation activities. The site usually operates on a seasonal basis from approximately mid April to mid November depending upon weather conditions. Plans included in this submittal illustrate the current status of mining activity, the locations of operations, phasing, proposed reclamation grades and potential restoration. Overburden is removed from areas to be mined and is stockpiled on site and later used for reclamation of completed phases. Aggregate is excavated above groundwater using front end loaders. A dragline or excavator will be used to excavate material within the groundwater. Processing consists of crushing, screening, washing and stockpiling. Recycling of concrete and asphalt occurs at the site and consists of crushing, screening and stockpiling. Some of the processed aggregate and recycled product is loaded on trucks using front end loaders, the trucks are weighed and the product is delivered to projects throughout the area. The balance of the processed aggregate and recycled product is used in a hot-mix asphalt plant which operates at the site. Front end loaders place specified aggregates into different cold feed bins. The aggregates are metered out of the bins onto a conveyor which delivers the aggregate into a rotating drum where they are blended together, heated and dried. Heated asphalt cement and recycled asphalt are mixed with the heated aggregate and conveyed into insulated overhead silos. Trucks drive under the silos to get loaded and weighed and then deliver the product to projects through out the area. 2 The asphalt plant is equipped with a baghouse air pollutant collection device and operates under a Minnesota Pollution Control Agency (MPCA) Air Emissions Permit. Fuel and asphalt cement are stored at the site. All storage tanks have secondary containment and are operated in compliance with MPCA regulations. An estimated 8 to 9 million cubic yards (cy) of aggregate reserves remain at the site. Based on previous activity, annual production at the site is 300,000 to 400,000 cy. Based on current production rates, the estimated life of the facility is about 20 to 30 years. However, the actual life of the site will be dependent upon future market demand. Blasting does not occur at this site. 5. Fee: The required application fee has been submitted to the City. 6. Survey indicating property boundaries : A survey of the site including property boundaries is included as Sheet Cl, Existing Conditions Plan. 7. Map of property indicating where mining is to occur and other significant features as required in Ordnance 103: Sheet C2, Site Plan, illustrates the site property lines, limits of proposed excavation, setbacks, and topographic data at two foot vertical intervals. Water courses, wetlands, wooded areas, rock outcrops, power transmission poles and lines, and other significant features are also shown. 8. General Location Map and aerial photo: A General Location Map, a 2005 Aerial Photo and a USGS Quad Map Excerpt, are included as Figures 1-3 respectively. These figures show the existing mining site in relation to the community. 9. Maps and Plans showing the following for the site and within 300 feet of the perimeter of the mine: A. Roads or streets showing all access routes between the property and the nearest arterial road, identifying name, right-of-way width and traveled portion width. 3 Main access routes to and from the site are County Road 15A (Manning Trail N.) and County Road 1 (Lofton Avenue). These are paved roads. The haul road off of Manning Trail N. is paved through the site to the hot-mix asphalt plant and loading area. The names, right-of-way widths, and traveled portion width of all adjacent roads are illustrated on Sheet Cl, Existing Conditions Plan. B. Easements Plan with widths and purpose. Easements, with widths and purpose are illustrated on Sheet Cl, Existing Conditions Plan. C. Natural land features showing locations of watercourses and drainageways, flood elevations, wetlands, sinks, basins and wooded areas. The locations of natural land features are illustrated on Sheet C2, Site Plan. D. Natural resources including other surface water, groundwater depth, flora, fauna, and any other natural features in the rural environment. The locations of natural land features are illustrated on Sheet Cl, Existing Conditions Plan. E. Manmade features such as buildings and other structures, dams, dikes, and impoundments of water. Man-made structures are indicated on Sheet C2, Site Plan. F. Adjacent land features with all of the requirements included above within 300 feet of the perimeter of the mine, and all platted subdivision lots, metes and bounds parcels, and homes within IA mile of the property boundaries. Wells should include private/agriculture, industrial, municipal wells within 1/2 mile radius of the mine. Adjacent land features are shown on Sheet 02. Platted subdivision lots, metes and bounds parcels, and homes within IA mile of the property boundaries are shown on Sheet Cl. All wells within % mile radius of the facility, which are on file at the Minnesota Department of Health's County Well Index, are indicated on Figure 4. 4 G. A minimum of 1 cross section for every 1000 feet running north/south and east/west, showing the extent of overburden, extent of sand and gravel deposits, the groundwater level, and any evidence of the groundwater level in the past. A series of six north/south and four east/west cross sections are included as Sheets C5-C9. These cross sections depict the existing elevation, overburden, final elevations, extent of deposit, and the elevation of the groundwater. Soil borings were completed as part of the original permitting process. The soil borings were used in developing the site cross sections. H. All processing areas and boundaries shown to scale. Processing areas are identified on Sheet 02, Site Plan. All access roads within the site to processing and mining areas shown to scale: Access Roads to the processing and mining areas are indicated on Sheet 02, Site Plan. J. Sequences or phases of operation showing approximate areas involved shown to scale and serially numbered with a description of each. There are essentially three phases remaining at the site. Mining will occur above the groundwater and into the groundwater concurrently in each of the remaining phases. Mining into the groundwater typically occurs once a mining facility begins to mature. A fairly large floor area is needed for a stockpile area, a processing area and an area to begin excavation into the groundwater. This facility has reached the stage where the floor area is large enough to accommodate mining into the groundwater. In addition, due to the variable nature of the aggregate deposit, it is necessary to mine above and below the groundwater concurrently in order to obtain the proper blend of aggregates. Each total phase ("a" and "b" inclusive) represents approximately five to ten years of mining activity depending upon aggregate quality and market demand. The sequence of operations showing the approximate areas involved in the various phases of the operation are indicated on the Phasing Plan, Sheet C4. 5 K. Location of screening berms shown to scale, and notes provided indicating when they will be used as reclamation material. In the same manner overburden storage areas must be identified and noted. The location of screening berms and overburden stockpile areas are indicated on Sheet 02, Site Plan. Currently, when overburden is being removed from a new area to be mined, every effort is being made to use that material in ongoing reclamation. The majority of the existing screening berms will be used in final reclamation. L. Fences and gates and their type or construction described and illustrated: Locking gates are indicated on Sheet C2, Site Plan. Three strand wire fence surrounds the majority of the site. Some areas of the site are not fenced due to topographic conditions and wetland areas. Locking metal gates are located at each of the site entrances. M. Proposed location of principal service or processing buildings or enclosures as well as locations of settling basins and process water ponds: There is a quality maintenance building (QM Lab) that is used for testing the hot mix asphalt, an equipment storage building used to store equipment and parts and a control building for the asphalt plant. A scale office is located above the QM Lab and is used for the asphalt plant and mining operation. There are no process water ponds located on site. There are no permanent sedimentation ponds for washing operations. These ponds are located near the portable wash plant when it is brought to the sight. When washing operations are complete, the silt in the sedimentation ponds is dried, blended with overburden materials and used for reclamation. The location of the buildings and enclosures are indicted on C2, Site Plan. N. Existing site drainage features and flow directions indicated. A plan for handling surface drainage during operation and after final reclamation, consistent with local surface water management plans. Surface water will be managed during active mining in accordance with the site's NPDES Stormwater Pollution Prevention Plan (SWPPP) and consistent with local surface 6 water management plans. This plan includes a number of best management practices (BMPs) which are incorporated into daily site operations. The BMPs have been designed and implemented to avoid untreated stormwater discharge from the site, minimize potential for erosion and sedimentation throughout the operation of the site and provide for site stabilization at the conclusion of mining activity. Erosion and sedimentation control practices used on site during active mining include silt fence, vegetated screening berms, stormwater sedimentation ponds, wetland buffers and dust control. Silt fence is placed as necessary along the limits of each mining phase in areas where topography does not accommodate internal surface water drainage next to sensitive areas. Screening berms around the perimeter of mining area are vegetated to reduce erosion and to help contain fugitive dust. A sedimentation basin is located on the floor of the mining operation to handle internal drainage. When needed, water from the sedimentation basin is pumped upland to a secondary sedimentation basin for additional treatment. Vegetative buffer strips are preserved around wetland areas. These buffer strips filter runoff and reduce the potential for sedimentation to occur within the wetland basins. Erosion and sedimentation control practices after final reclamation include achieving permanent stabilization of the site through proper reclamation design standards. After mining is completed, reclamation will be performed to restore the site to a stable condition, minimize the potential for erosion and allow for future development of the land. Reclamation will involve slope stabilization, seeding and mulching. The Mining and Reclamation Plan, Sheet 04, indicates proposed site elevations upon completion of restoration. Slope stabilization will be accomplished by backfilling and grading the side slopes to a maximum of 4:1 in upland areas. A minimum of four inches of loamy soils, suitable as topsoil, will be placed on the graded slopes. After topsoil has been placed, the slopes will be seeded and mulched to establish vegetation. Slopes around the water's edge will be 6:1 or less for a distance of 100 feet waterward. Upland will be planted with a mix of native trees, shrubs, grasses, flowers and groundcover. 7 O. A plan for groundwater quality protection to include a minimum of three soil borings showing depth to groundwater. Protection of the quantity and quality of groundwater resources is vital. Groundwater is a valuable resource that is used as the source of drinking water to area residents. Additionally, groundwater interacts with, and plays an important role in sustaining, several high value surface water resources within the region. Removal of aggregate into the groundwater and the creation of a groundwater lake was part of the overall plan for the site when it was initially permitted. Mining into the groundwater will take place for three to five months per year. The material is stockpiled and allowed to dry for a period before it is blended with the material above the groundwater and processed. An area of three to four acres in size will be mined into the groundwater each year. Environmental review evaluating the potential for significant environmental impacts as a result of mining into the groundwater and creating the lake has been completed for the site. Two Environmental Assessment Worksheets for the project which included mining into the groundwater table have been completed. The EAW's for the site examined the potential for significant environmental effects. This included effects from mining that result in the creation of a groundwater lake. During this process, Washington County hired Barr Engineering Co. (Barr) to perform a hydrogeologic investigation of the impacts of mining into the groundwater. One of the components of the hydrogeologic study was to determine the immediate and long-term impacts of development of a 50 acre surface water feature on the surficial aquifer and on German Lake. The report indicated that the analysis used conservative values and neglected the water present in the soil voids. Estimated peak rate removal rates of 233 gallons per minute resulted in a predicted drawdown of 0.2 feet at German Lake. The report indicates that actual drawdowns would probably be less since excavation is not expected to occur constantly. The Barr report further determined that "the average withdrawal rate over a period of thirty years is equivalent to a pump removing 1.7 gallons per minute. Even if the entire pond area 8 were excavated in one year the pumping rate would b8 BqW|VB/eDt to 51.63 gallons per minute. |1 may b8 seen that the long term pumping rate will be far less than the peak rate analyzed above and that long-term effect 0f the pit expansion will be negligible". |O the spring of2O08. the Washington County hired Barr to review and update their report. The 2005 Barr review reiterated that the "equivalent groundwater pumping rate caused bythe xvithdF8vva| of gravel from below the water table vvOu|d have 8 negligible long-term effect on the water t8b|e." (emphasis added) Soil borings have been drilled On the site and used for the DU[pnSes of defining subsurface conditions 8t the site, including four borings that extended into the groundwater table. Past hydrOgeo|Ogic investigations have been completed at the site and provide additional groundwater data information within the mining area. A production well located On site yields additional groundwater elevation information. Figure 5 illustrates the locations of these vve||s/pieznnneterS and soil borings. The mining operation i5 located inGn area characterized bythe prevalence of very gF8nu|8[, permeable and DOO're8CUVe soils with very low filtering capacity typical of sand and gravel deposits. These characteristics hOvvBv8r, are associated with 8 high sensitivity to groundwater contamination. If contaminants are introduced into the S0i| CO|UnnD, groundwater may be impacted within a very short time frame. There are a number Of Site BMP8 and technologies available that are discussed b8|ovv which eliminate or reduce the potential of introduction Of contaminant sources into the SOi|S. Groundwater Protection Plan * Elimination Vf industrial wastewater discharges associated with the asphalt plant. The asphalt plant iS currently equipped with a bGghOUSe tO reduce air emissions, NO water i5 used iOthe operation Ofthe asphalt plant. * Limited equipment maintenance i3 performed on-site and follows company spill prevention policies. * A service truck comes tO the site \0 perform routine personnel and hauled off-site to a central collection point (waste oil is not classified as hazardous waste). The service truck carries a spill containment kit. • All storage tanks are above ground and have secondary containment. Secondary containment consists of an impermeable concrete enclosure with a concrete base. The portion of the containment area with the used oil and fuel tanks also has an impermeable membrane on top of the concrete. In the event of a tank failure the secondary containment prevents the release of petroleum products to the environment. • A Spill Prevention Control and Counter Measures Plan (SPCC Plan) has been prepared for the site. This plan documents procedures to be followed in the event of a spill or release at the site. Company policy regarding spills is that any spill of oil, gasoline, diesel fuel, lubricant, or asphaltic cement is to be reported to Paul Schultz P.G., Tiller's Land Use Coordinator, and cleaned up promptly. Any spills of 5 gallons or more of petroleum products or any volume of hazardous materials are reported to the state duty officer as required by applicable state statutes and regulations (Minn. Stat. 299K) • Topping off tanks of any kind is not allowed under company procedures. All transport piping is above ground and tanks are equipped with audible electronic alarms to prevent over filling. Warning signs and chock blocks are used to prevent premature vehicle departure. • Availability of spill cleanup equipment on-site including equipment to excavate and remove impacted soils in an expedited fashion, as well as fire fighting extinguishers, absorbent pads, spill blocker dikes, empty barrels, rags and shovels. Protective measures in addition to those outlined in the preceding section, have been adopted as part of extraction into the groundwater. They include: • Stormwater routing to prevent untreated stormwater runoff from entering the groundwater lake. • Berming and/or diversion of agricultural runoff from the mining area. 10 • Surface water monitoring and expansion of groundwater monitoring network. Measures to protect groundwater quality will be incorporated into final site design once final development has been determined. These will involve a variety of best management practices, including stormwater treatment, erosion control and vegetative filter strips. P. All mining operations must install one monitoring well. If the proposed mining operation will appropriate groundwater for use in mining operations, the operator shall install not less than one monitoring well down gradient of the mining operation. If the proposed mining operation will include mining into the groundwater table, not less than two monitoring wells shall be installed one up-gradient and one down-gradient of the mine. Groundwater Monitoring Plan Groundwater monitoring is conducted on an annual basis at the site. Currently the three on-site wells are monitored for Diesel Range Organics (DRO) on an annual basis. Samples are collected from the production well, the potable well that supplies the scale house, and from an on-site piezometer1 installed during a previous groundwater study. Figure 5 illustrates the location of the monitoring points with respect to the mining operation. The elevation of the groundwater table and flow direction is also indicated on this figure. In the past, results of the water analysis were sent to the County and Township on an annual basis. In the future, monitoring results will be submitted to the City of Scandia. Upon issuance of the permit, monitoring will be conducted according to the following schedule: Well ID Parameter Frequency Scale House DRO Annual Production Well DRO Annual PZ-3 DRO Annual Production Well Water Level Spring/Fall PZ-3 Water Level Spring/Fall _ Two of the three piezometers installed during the groundwater study have been removed. P2 was removed to allow restoration of the northern 40 acres of the site. P1 was removed because it was located in an operational area. P3 continues to be sampled annually. 11 The monitoring well network will be expanded prior 0omining activity into the groundwater. Three additional monitoring vveUO will be installed for the pUFpO3eS of monitoring groundwater quality and quantity. These three monitoring pOints, in conjunction with the existing DieZOrnete[ PZ-3 and the production well, will be used to rSCnRj vvgte[ levels twice a year during the spring and f8||. One monitoring well, PZ-4, will be installed upgr8di8ntofthe mining activity in the southeastern portion Vfthe site. This well will help define the regional vvote, table elevation in the southern portion Of the site and provide background water quality information. Another well, PZ-5' will be installed in the western portion of the site, between the active mining limits and German Lake. This well will help define the regional water table in the western portion of the site and monitor fluctuations if any in the groundwater table associated with the mining activity. The |oSt well, F`Z6, will be located dovvngradient of the vvaterbody that will be Created as a result of mining into the groundwater table. The well will also be located dovvngnadient of the existing plant GOOlRvvheFe in the very northern portion of the site. The eX@C< |OC8U0n Of this well will be determined after the iDst8||GUOO 0fPZ-4 and PZ-5 So that water levels from these two vvSU8 and PZ-3 and the production well can be U1i|iZ8d to 8S/8[t 8 |OC@bOO that is most representative ofdOvvngrodi8ntconditions. It is possible that PZ-3 may be used as the dOxvngr@di9Dt well. In addition to obtaining water level data from these wells, PZ-4 and PZ-0. the Vpgradient and dovvngradiCnt vve||8 will serve as vve1er quality monitoring points for the purposes of tracking vv@te[ quality in the lake and the groundwater. These vve||e will be sampled @DOUaUy in CorUuDCtiOD with the lake water quality 38DlDliOg episodes for nutrients (nitrogen and phosphorous), total suspended SO|idS and DR[). The general |oC81i0OS of the rnOOitV[iDg vV8||s are indicated on Figure 5. VVe||S P74' P75 and P76 will be installed prior to mining into the water table so at least one round of sampling can be taken to establish G baseline, Once the additional VV81l9 have been iOS1G|lCd. the sampling sChCdU|8 will be as outlined in the table below. Spring sampling will occur sometime within late April —K48y. FG|| sampling will OCCUr sometime within September — early {]CtOhe[. /\nOU8l sampling will OCCU[ during the active mining season. Well ID Parameter Frequency Scale House DRO Annual Production Well DRO Annual _ PZ-3 DRO Annual PZ-4 DRO Annual PZ-6 DRO Annual _ Water Body DRO Annual _ Production Well Water Level Spring/Fall PZ-3 Water Level Spring/Fall PZ-4 Water Level Spring/Fall PZ-5 Water Level Spring/Fall _ PZ-6 Water Level Spring/Fall PZ-4 Nitrogen/Phosphorous/TSS Annual PZ-6 Nitrogen/Phosphorous/TSS Annual Water Body Nitrogen/Phosphorous/TSS Annual Sampling results will be submitted to the City on an annual basis in conjunction with the annual report. The results will be reviewed to obtain a picture of the water quality coming into the lake, at the lake, and leaving the lake. The report will include previous years' data and will be in a spreadsheet or graph form to facilitate identifying trends in water quality. Results will be reviewed for any indication of impacts to water quality or quantity as a result of mining. It should be noted that fluctuations in groundwater levels can be expected in response to climatic conditions. Therefore, a review of surrounding observation wells finished in the same aquifer will be made to help evaluate the observations and correlate any trends seen in the facility's water levels with regional trends. Q. If lighting is proposed, a plan for lighting the area must be provided. The plan must comply with all City ordinances pertaining to lighting. Security lighting is provided around the quality control building and hot-mix asphalt plant. As daylight hours grow shorter in the fall of the year, lighting is provided for the hot- mix asphalt plant and the crushing and screening operations. The lighting structures are on the floor of the pit and the lights are hooded and directed downwards R. Reclamation plan in conformance with Section 8. 13 The Mining and Reclamation Plan, Sheet 03 is a graphic representation of reclamation activities. • Intent: The intent of reclamation activities covered in this section is to restore the site to a stable condition, minimize the potential for erosion and allow for future development of the land. • Methods and processes of reclamation: Reclamation will involve slope stabilization, seeding and mulching. Slope stabilization will be accomplished by backfilling and grading the side slopes to a maximum of 4:1. A minimum of four inches of loamy soils, suitable as topsoil, will be placed on the graded slopes. After topsoil has been placed, the slopes will be seeded and mulched to establish vegetation. • Initial condition of mining site: The site was an existing mining operation when Tiller Corporation began operating this facility. • Limits of various operational areas: The operational areas are indicated on the Site Plan, Sheet 02. • Phasing and timing of operations and reclamation including areas to be stripped of overburden. Phasing of mining operations is included on the Phasing Plan Sheet 04. Some reclamation activity has been completed. These areas are illustrated on the Site Plan, Sheet 2. Reclamation of sideslopes will continue as mining progresses around the perimeter of the excavation limits. • Final Condition of the site, including proposed contours and landscaping: The Mining and Reclamation Plan, Sheet 03, indicates proposed site elevations upon completion of restoration. • Relation of final site condition to adjoining land forms and drainage features within IA mile. Reclamation of the site will result in a groundwater lake with open space around the lake, a substantial wooded area with isolated wetland basins in the western and southeastern portions of the site and upland areas in the eastern and northeastern portions of the site. • Relation of reclaimed site to planned or established uses of surrounding land: The land is designated general rural/agriculture with 4/40 densities. Surrounding land use is similarly guided. Established land uses are agricultural and rural residential in nature. 14 • A plan for maintenance of reclaimed area: See Mining and Reclamation Plan, Sheet 03. • A detailed cost estimate of reclamation and maintenance: Reclamation costs for the area currently opened to mining activity as well as the projected next five year phase are outlined below. A portion of Phase 1 will involve the creation of a water body and will not require topsoil and vegetation. The area where mining into the groundwater is to occur is currently disturbed therefore the numbers below are conservative. Final Grading: Placement of 4" topsoil from on-site stockpiles; 96 acres: 51,627cy at $ 1.00/cy $51,627 Finish grading of disturbed area; 96 acres: 96 acres at $1,000/acre $96,000 Seeding and Mulching 96 acres at $600/acre $57,600 Total reclamation costs; $205,227 Reclamation will proceed concurrently with mining operations. Reclamation activities which take place during the past mining season as well as reclamation activities planned for the subsequent mining season will be discussed in each annual report. Reclamation standards as included in Ordinance No. 103 Section 8.3-8.8 will be followed. S. If blasting is proposed as part of the mining operations, the operator must indicate frequency, timing, size, duration and develop a blasting plan: Blasting is not performed at this site. T. A description of any processing operations including washing crushing, recycling and bituminous plants and concrete ready- mix plants. 15 Aggregate is excavated above groundwater using front end loaders. A dragline or excavator is used to excavate aggregate within the groundwater. Processing at the site generally includes crushing, screening, washing, sorting and stockpiling of aggregate, recycling of concrete and asphalt by crushing, screening and stockpiling and the production of hot-mix asphalt. A hot-mix asphalt plant operates at the site. Front end loaders place specified aggregates into different cold feed bins. The aggregates are metered out of the bins onto a conveyor which delivers them into a rotating drum where the aggregates are blended together, heated and dried. Heated asphalt cement and recyclable asphalt are mixed with the heated aggregate and conveyed into insulated overhead silos. The asphalt plant operates under MPCA Air Emission Permit Number 00001987-001 (AQD File Number 1394A). The asphalt plant is equipped with a baghouse air pollutant collection device. The mining and aggregate processing, recycling and hot-mix asphalt production activities all operate in compliance with applicable Federal and State standards and the operating standards of Ordinance No. 103. III. OPERATING CONDITIONS 1. Setbacks: Mining, stockpiling or land disturbance activities, with the exception of berming and visual screening, will be setback 50 feet from an adjoining property line, 200 feet from an occupied structure, 100 feet from any contiguous property subdivided into residential lots of 5 acres or less, and 100 feet from any road right-of-way. As shown in the attached plan set, the setback along the common mining boundary to the south will be 0'. 2. Fencing: The entire site is fenced with 3 strand wire fencing except where prohibited due to topography and wetlands. There are locking metal gates at both 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 16 schedules or weather delays. If operations are required beyond the 7:00 a.m. to 7:00 p.m. hours, or on Saturdays, Sundays or holidays, prior permission will be obtained from the City of Scandia in accordance with procedures set forth in Ordinance No. 103. 4. Screening: The site is operated in a manner to minimize the visual impact of the extraction and processing area on surrounding properties. In addition to the wooded buffer areas that 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. Established screening berms are shown on Site Plan, Sheet C2. 5. Dust control: Dust is generated by crushing and screening equipment, excavation and loading equipment, and vehicular movement. Vehicular dust generation is minimized by paved access roads. Processing areas are located at elevations lower than the surrounding terrain in order to minimize windborne dust leaving the site. A water truck is used to water unpaved portions of the site. The sand and gravel activities at the site operate under General Air Emission Permit Number 05301018-001, which is issued by MPCA. 6. Noise: Noise is generated from processing activities, loading processes, and vehicular movement. Noise is minimized by conducting processing activities within the interior of the site at elevations lower than the surrounding lands. All activities are conducted so as to be in accordance with all Federal, State and County noise standards. 7. Depth of excavation: Depth of excavation will be limited by the practical limits of the equipment which is 45 feet below the water table or approximately 870 feet above mean sea level. 8. Site clearance: Trees, stumps, roots and other vegetative material removed during site clearance or other activities will be disposed of by logging and/or chipping. Logged material will be used for lumber or 17 firewood. Chipped material will be used as mulch, bio-fuel at approved facilities, erosion control devices or other approved utilizations. 9. Appearance/condition: All buildings, plants and equipment at the site will be maintained in a neat condition. Weeds and other unsightly or noxious vegetation shall be 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: Any waste generated from the operation shall be disposed of in accordance with Federal, State and County requirements. 12. Water Quality Monitoring: See Sections II. 0 and II. P. 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 1,000- gallon above-ground storage tank which is located within a concrete secondary containment area. When production equipment is present, an additional 1,000-gallon double walled tank is brought to the site and used to fuel processing equipment. All asphalt cement storage tanks are above-ground. These tanks consist of two 40,000 gallon tanks and one 20,000 gallon tank. There is also a 20,000 gallon above-ground used oil storage tank. The used oil is used as an alternative fuel supply for the asphalt plant. All tanks are within the secondary containment area and 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 18 Protection Agency (EPA) rules. EPA ID Number MND 981 953 417 has been issued for the site and it is classified as a Very Small Quantity Generator. The site has obtained a National Pollutant Discharge Elimination System (NPDES) Permit as required by EPA and issued by MPCA. This permit requires that the site operates under the associated Stormwater Pollution Prevention (SPP) Plan. A copy of the NPDES Permit and SPP Plan will be supplied to the City 14. Contingency Response Plan: As stated previously, the site operates under a SPCC Plan. SPCC Plan. This is required by EPA regulations and Tiller will submit necessary portions of the SPCC Plan to the City and the City's fire department. In addition, the site is subject to reporting requirements under the Emergency Planning and Community Right-to-Know Act (EPCRA), also known as Title III of the Superfund Amendments and Reauthorization Act of 1986 (SARA). These Acts are administered by Minnesota Emergency Response Commission (ERC) which is part of Minnesota Homeland Security and Emergency Management, a division of Minnesota Department of Public Safety. The site's ERC ID Number is 82-125-0001. The required reporting under EPCRA and SARA includes submitting a Tier II Chemical Inventory to the City's fire department. This is done on an annual basis. 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 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. 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. 19 17. Recycling: Recycling at the facility will meet all applicable standards contained in Section 7.1 (1) of Ordinance No, 103. The estimated volume of materials recycled on an annual basis is approximately 50,000cy asphalt and 25,000cy concrete. The stockpile of material to be recycled will not exceed the volume of material that can be processed in two consecutive operating seasons. 18. Trucking Operations: The site has access to County Road 15 (Manning Trail) and County Road 1 (Lofton Avenue). These are paved 9 ton roads. The haul road off of Manning Trail is paved through the site to the hot-mix asphalt plant and loading area. Trucks are loaded so as to comply with state law. Loose material is cleaned from the trucks and tires before the leaving the facility. 19. Asphalt Plants and Ready-mix plants: The site operates a permanent hot-mix 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. The site operates under an air quality permit issued by the Minnesota Pollution Control Agency. IV. 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: November 21, 2007 Reg. No, 21842 20 ATTACHMENT 1 LEGAL DESCRIPTION Legal Description for New Scandia Mining Site Section 1. The Southeast 1/4 of Section 7, in Township 32 North, of Range 20 West; and that part of the Southwest 1/4 of the Southwest 1/4 of Section 8, in Township 32 North, of Range 20 West, described as follows: Commencing at a point in the North line of said Southwest 1/4 of the Southwest 1/4 of said Section 8, 22 rods East of the Northwest corner thereof, thence West along said North line to the Northwest corner of said Southwest 1/4 of the Southwest 1/4, thence South along the West line of said Southwest 1/4 of Southwest 1/4 to the Southwest corner thereof, thence East along the South line of said Southwest 1/4 of the Southwest 1/4 a distance of 42 rods to a point, thence Northwesterly in a straight line to the point of beginning; and also a strip of land 2 rods wide on the North side of said Southwest 1/4 of the Southwest 1/4, commencing 22 rods East of the Northwest corner thereof and extending to the Northeast corner thereof. That part of the South Half of the Northeast Quarter of Section 7, Township 32 North, Range 20 West, Washington County, Minnesota, described as follows: Commencing at the Northwest corner of said South Half; thence Easterly along the North line of said South Half a distance of 1223.40 feet to the point of beginning; thence Southerly, parallel with the West line of said South Half, a distance of 1319.60 feet to the South line of said South Half; thence Easterly along said South line a distance of 1423.65 feet to the Southeast corner of said South Half; thence Northerly along the East line of said South Half a distance of 1317.76 feet to the Northeast corner of said South Half; thence Westerly along the North line of said South Half a distance of 1422.96 feet to the point of beginning. Subject to 228th Street North along North line. Section 2. That part of the Southeast Quarter of the Southwest Quarter and of the South Half of the Northeast Quarter of the Southwest Quarter of Section 7, Township 32, Range 20, Washington County, Minnesota lying easterly of the centerline of County Road 15A as said centerline is described in Book 312 of Deeds on pages 19 and 20. Subject to County Road 15A. Subject to easements of record. Section 3. The North One-Half of the Southwest Quarter (N 1/2 of SW '/4) and the Southeast Quarter of the Northwest Quarter (SE 1/4 of NW 1/4) all in Section 8, Township 32, Range 20. Except: All that part of the Northeast Quarter of the Southwest Quarter (NE 1/4 of SW 1/4) of Section 8, Township 32, Range 20, Washington County, Minnesota lying East of the centerline of County State Aid Highway No. 1 (Lofton Avenue). Section 4. That part of the Southeast Quarter of the Southwest Quarter (SE 1/4 of SW 1/4) of Section 8, Township 32, Range 20 lying West of the public highway as the same now runs over and across said tract, except the North 2 rods thereof; and that part of the Southwest Quarter of the Southwest Quarter (SW 1/4 of SW 1/4) of Section 8, Township 32, Range 20 described as follows, to wit: Beginning 22 rods East of the Northwest corner of said Southwest Quarter of Southwest Quarter (SW 1/4 of SW 1/4); thence Southeasterly in a straight line to a point 42 rods East of the Southwest corner of said Southwest Quarter of Southwest Quarter (SW 1/4 of SW 1/4); thence East to the Southeast corner of said Southwest Quarter of Southwest Quarter (SW 1/4 of SW 1/4), thence North to the Northeast corner of said Southwest Quarter of Southwest Quarter (SW 1/4 of SW 1/4), thence West to the point of beginning, except the North 2 rods thereof, said tract. Except: That part of the North 320.00 feet of the South 620.00 of the Southeast Quarter of the Southwest Quarter of Section 8, Township 32, Range 20, Washington County, Minnesota, lying Westerly of the center line of County State Aid Highway No. 1, as the same is now laid out and traveled, said center line is described as follows: Beginning at a point on the South line thereof distant 37.30 feet Westerly of the Southeast corner thereof (for the purposes of this description, the South line of said Southeast Quarter of the Southwest Quarter is assumed to bear South 89 degrees 38 minutes 18 seconds West); thence Northerly along a curve concave to the West, having a radius of 2864.81 feet and a central angle of 7 degrees 12 minutes 48 seconds, a distance of 360.67 feet, the chord of said curve bears North 14 degrees 39 minutes 10 seconds West; thence North 18 degrees 15 minutes 34 seconds West, tangent to said curve, a distance of 282.59 feet; thence Northerly along a tangential curve, concave to the East, having a radius of 1980.97 feet and a central angle of 20 degrees 29 minutes 54 seconds, a distance of 708.72 feet to the North line of said Southeast Quarter of the Southwest Quarter, and there terminating. And lying Easterly of the following described line: Commencing at the Southwest corner of said Section 8; thence Easterly along the South line of said Section 8, a distance of 1714.61 feet to the point of beginning of the line to be described; thence Northeasterly, deflecting to the left 83 degrees 54 minutes 52 seconds, a distance of 623.51 feet to the North line of the South 620.00 feet of said Southeast Quarter of the Southwest Quarter, and there terminating. Also except: That part of the Southeast Quarter of the Southwest Quarter of Section 8, Township 32 N, Range 20 W, described as follows: Commencing at the Southwest corner of said Section 8, thence Easterly along the South line of Section 8 a distance of 1714.61 feet which is the point of beginning of this description; thence Northeasterly deflecting to the left 83 degrees 54 minutes 52 seconds a distance of 301.70 feet to the North line of the South 100 feet of the Southeast Quarter of the Southwest Quarter of Section 8; thence Easterly along said North line a distance of 757 feet, more or less, to the center line of County State Aid Highway No. 1; thence Southeasterly along said center line a distance of 305 feet, more or less, to the South line of Section 8, thence Westerly along said South line a distance of 862 feet, more or less, to the point of beginning, according to the United States Government Survey thereof and situate in Washington County, Minnesota. _ -.-_.............. • GENERAL FOREST SCANDIA PROJECT LAKE LOCATION HUGO MAY STILLWATER GRANT MAHTOMEDI BAYTOWN LAKE OAKDALE ELMO WEST LAKELAND WOODBURY AFTON GREY CLOUD ISLAND COTTAGE DENMARK GROVE WASHINGTON COUNTY GENERAL LOCATION MAP FIGURE I ----.............. . n --1\ r ,v 1 _ . 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MEMORANDUM / EMWNS Date: March 25' 2O08 To: CM3CW[) Managers Dan Fabian, PE From: 5k/ Grubb, PG Subject: Potential groundwater impacts Review o[Conditional Use Permit Application |n the City o[3candiofor Mining and Related Activities. Tiller Corporation. Novcnnbcr20O7. Groundwater Quantity No apparent hydraulic connection exists between the regional water table (elevation approximately 9208) and German Lake the nearby wetlands (water e|rvah on approximately 953 M). A confining layer apparently keeps the lake and wetlands perched above the regional water table. The cross acc\inus and text o[the pc/oii< application should show and discuss this feature. It in unlikely that further excavation o[the pit downward and to the east will have additional impacts to German Luke and the wetlands. Because there is no hydraulic connection between the pit and Ocrmuo Lake, the previous calculation or model indicating that the removal of water from the pit during mining operations will have minimal effect on Oucnoun Lake is not ro|cvaoi The calculation does indicate that effects ou water levels in nearby wells will be minimal, which is also important. The perched aquifer system is unusual in the watershed district and Washington County, so the applicant should expect careful scrutiny of water \cvdu in German Lake, the wetlands, and the pit. If falling water levels are noted ioGcnoun Lake nrthe wetlands, the watershed district and others should n'oxamioo the groundwater data and conceptual noodc| in the area of the pit. Groundwater Quality A{pho//p/on/ Groundwater below the gravel ph is highly susceptible to contain ination. A spill of pdndcu|n products or other liquids would reach the groundwater almost immediately. [MSCVVD recommends that the City o[3cxudiu carefully consider the risks associated with permitting an uopba|| plant in the Tiller mine. The Washington County Ovuunduxatm' 2007 Work Plan (n. 18) states that the County will require plans for servicing ofequipment, waste disposal, and groundwater protection and will require bond \n assure clean-up nf any pollution. MakInyA DIffeoence Through In&egva8efRe5ounce Management E0R, INC.' 651 Hale Avenue North` Oakdale, MN55128^ Tel: (651) 77U'8418' Fax: (6S1) 770'2552 Drinking water The City o[Scondixiu reviewing and permitting this proposed project uai1ro|aJcok/ drinking water concerns. These comments are offered for their consideration. The process of mining into the water table will likely change the water chemistry at the site and migrating of[thcsite. Changes in water quality parameters may result from moving and removing material from the pit. The proposed groundwatermonitoring plan is adequate for detecting groundwater contamination due k» spills, but it should hc expanded to include the following parameters: Well ID Parameter Frequency Scale House, Production Total Suspended Solids, &nouu| Well, P7-IPZ-4, P2-0 Total Dissolved Solids, pH, ` EMMONS LIPr & OLIVIER RESOURCES MEMORANDUM Date: April 23, 2008 To: CMSCWD Board of Managers From: Lisa Tilman. P.E. and Dan Fabian, P.F,. Re: Summary of Review and Recommendations for Permit App. No. 08-003 Tiller Corporation Mining Operation, Scandia We recommend Managers authorize Administrator to approve and issue permit contingent on Applicant addressing following comments to satisfaction of District Engineer: Summary of comments to be addressed prior to permit issuance: 1. For the required review fees a deposit of$5,500.00 has been received as of 04/03/2008. Applicant is responsible for replenishing this deposit if it appears it will be insufficient to cover District review costs. The estimated completion date for this project is 20-30 yrs (we assume this means from today's date and not the 1960's starting date. The District's standard permit length is 1-year. Managers will need to determine duration District permit will be valid before it will need to be renewed. If permit length is longer than 1-year a minimum annual status update from applicant and site visit should be coordinated with Scandia CUP and issuance of Annual Operators Permit. Managers will also need to establish method to re- coup costs for annual reviews. 2. District surety still needs to be provided. The City of Scandia requires a surety as part of its Mining Ordinance CUP and Annual Mine Operators Permit. Managers should consult with City to see if an agreement can be made that District would not need to require a separate additional surety. Perhaps requiring the applicant to maintain a cash deposit with the District of some amount as part of the permit fee requirement would be acceptable. This would ensure that District would recoup on-going review fees, while any major issues could perhaps be addressed through coordination with the City's permit enforcement process. 3. The proposed total discharge rate offsite is the same as the total pre-settlement discharge rate offsite. The proposed total discharge volume offsite for the 2-year and 10-year event is equal to or less than to the total pre-settlement discharge volume offsite and to internal landlocked wetland basins. (Note Comment 5 below as related to Wetland 8.) 4. Identify 100-yr flood Elevation of proposed landlocked lake on plan sheet. Minimum design storm would be 100-yr 10-day Snowmelt. Starting lake elevation would be highest known groundwater elevation in lake area. Verify that lake will not discharge offsite. 5. Proposed construction of groundwater lake: Page 2 3/23/08 Tiller Corporation Mining Operation Review a. The proposed site plan results in a final condition with drainage to a proposed constructed landlocked "lake" in the groundwater. Proposed lake bottom contours need to be provided before we can provide comment on proposed lake construction. b. The direct connection to groundwater during mining and after reclamation of the site makes the site vulnerable to contamination of the groundwater table. The proximity of the asphalt plant to the lake also increases risk. It is our understanding that the City of Scandia has hired experts to look into this issue in depth, particular any potential impacts to neighboring drinking water supply wells. A trigger needs to be established for removing the asphalt plant and perhaps the recycle operations prior to the lake being constructed. Say when the open water portion of the lake gets within 500-ft of the asphalt plant or recycle operations. Refer also to attached memo from FOR groundwater specialist. c. Neither existing nor proposed rules specifically address creating of a small lake, either groundwater or surface water dependent. • A lake management plan needs to be provided addressing the design of the lake, the ecosystem and protection of water quality during and after construction. Proposed construction plan needs to be consistent with the lake management plan. This should be done prior to construction of the proposed lake. • The lake if not properly designed and constructed so it functions properly has the potential to be an undesirable eye sore rather than an amenity to the area. d. Future district development reviews will likely treat lake as a groundwater dependent natural resource. 6. During mining activity, stormwater will be treated through settling in a detention pond in the mined area and pumped for secondary treatment in a detention pond at original ground elevation. The secondary pond discharges to an onsite wetland, Wetland 8. The submitted modeling does not take into account this source of drainage to Wetland 8. The contributing surface drainage area of Wetland 8 is also proposed to be reduced under proposed conditions. a. Provide operations plan for pumping of sedimentation basin. Initial conversations with Tiller Representatives indicated that sediment basin in the pit is pumped into another treatment basin that overflows, through a piped outlet, into Wetland 8. Pumping activities are stopped prior to water levels in the second treatment basin outletting into Wetland 8. b. Drainage computations for impacts to Wetland 8 need to take into account pumped flows from the pit sediment basin. c. Revise proposed grading limits so that the drainage area of Wetland 8 is not changed from existing conditions. Once the wetland has been delineated and if proof is provided and accepted that the reduction in drainage area will not negatively impact the function or value of Wetland 8, applicant could submit a revised grading plan for approval. 7. Include in plans procedures for loosing of soil to restore Soil permeability prior to final planting and site restoration. Concern is that under the reclaimed condition if B soils are used as fill, (as currently proposed) and they are heavily compacted during placement, soils will function like C soils and runoff will increase. Page 3 3/23/08 Tiller Corporation Mining Operation Review GENERAL COMMENTS AND BACKGROUND INFORMATION The Tiller Corporation Mining Operation is located between Manning Trail and Lofton Avenue south of 228th Street in Sections 7 and 8, T32N, R20W in the City of Scandia. MN (see Figure 1 for location map). The property is located in both the Carnelian Marine St. Croix Watershed District and the Comfort Lake Forest Lake Watershed District. The proposed project entails the continuation of gravel mining and processing activities on a 395 acre lot. The project includes crushing and washing of gravel, recycling of concrete and asphalt, and production of hot-mix asphalt. Mining will occur within the groundwater table. The project will disturb a total of 155 acres through mining to an elevation of approximately 870 ft., 45 feet below the water table. The groundwater elevation is estimated to be about 916 ft. based on past groundwater monitoring not submitted to the District at this time. A portion of German Lake, a groundwater-dependent natural resource, is located on the property. Additionally, 22 wetlands are located on the site, eight of which are located within the CMSCWD. Mining will not occur within the shoreland management district of German Lake and no alterations are proposed within the drainage areas of any wetlands within CMSCWD except Wetland 8. The reclaimed condition of the site will be a 50-acre "lake" created in the groundwater table in the center of the active mining area along the CMSCWD eastern boundary. In order to evaluate the proposed mining activities at the Tiller Corporation Gravel Mine in Scandia, the following review evaluates the proposed activities with respect to the standards of the current and proposed Carnelian Marine St. Croix Watershed District (CMSCWD) Rules. Permit application is for completion of planned mining activities through complete restoration of vegetation for entire site. Any further proposed development of site following completion of mining activities will require a new permit application submittal and will need to meet the district permit requirements applicable at the time of submittal. The Carnelian Marine St. Croix Watershed District (District) initially provided review comments to Scandia on this project that primarily pertained to the completeness of information received by City to meet District permit submittal requirements, in our letter dated January 24, 2008. All remaining materials, needed for a complete District Permit Application for this project, were received on April 4, 2008. The District also provided input to Scandia during development of their Mining Ordinance in 2007. MEMORANDUM I EMMONS Date: March 25,2008 L RR OLIVI ER _ RESOURCES To: CMSCWD Managers Dan Fabian, PE From: Stu Grubb,PG Subject: Potential groundwater impacts Review of Conditional Use Permit Application to the City of Scandia for Mining and Related Activities. Tiller Corporation. November 2007. Groundwater Quantity No apparent hydraulic connection exists between the regional water table(elevation approximately 920 ft)and German Lake or the nearby wetlands(water elevation approximately 953 ft). A confining layer apparently keeps the lake and wetlands perched above the regional water table. The cross sections and text of the permit application should show and discuss this feature. It is unlikely that further excavation of the pit downward and to the east will have additional impacts to German Lake and the wetlands. Because there is no hydraulic connection between the pit and German Lake,the previous calculation or model indicating that the removal of water from the pit during mining operations will have minimal effect on German Lake is not relevant. The calculation does indicate that effects on water levels in nearby wells will be minimal,which is also important. The perched aquifer system is unusual in the watershed district and Washington County, so the applicant should expect careful scrutiny of water levels in German Lake,the wetlands, and the pit. If falling water levels are noted in German Lake or the wetlands, the watershed district and others should re-examine the groundwater data and conceptual model in the area of the pit. Groundwater Quality Asphalt plant Groundwater below the gravel pit is highly susceptible to contamination. A spill of petroleum products or other liquids would reach the groundwater almost immediately. CMSCWD recommends that the City of Scandia carefully consider the risks associated with permitting an asphalt plant in the Tiller mine. The Washington County Groundwater 2007 Work Plan(p. 18)states that the County will require plans for servicing of equipment, waste disposal, and groundwater protection and will require a bond to assure clean-up of any pollution. Making A Difference Through Integrated Resource Management EOR, INC.• 651 Hale Avenue North. Oakdale, MN 55128• Tel: (651) 770-8448• Fax: (651) 770-2552 0 T,.:,.:.:,,., IL. .. ...._ ,Filler Corporation owl Hs 00'101Ilg rili,i.S101!5 • ,,t, CO RPO TION Commercidl Asphalt Co, Barton Enterprises, Inc. Corporate Office: CO Box 1480 ,eneral:(753)425-4191 7200 Hemlock Lane,Suite 200 facsimile:(763)425-7153 Maple Grove,Minnesota 55311 web: ww,v,lillo.corp.com May 1, 2008 Sherri A. Buss, R.L.A. TKDA 444 Cedar Street,Suite 1 500 Saint Paul, MN 55101 Dear Sherri: I am writing in response to your May 1, 2008 e-mail to Kirsten Pauly with Sunde Engineering, PLLC. You were requesting information about the permits/regulations and safeguards that are in place for Tiller Corporation's (Tiller's) asphalt plant and how these permits/regulations and safeguards address potential spills or potential pollution issues, Our Conditional Use Permit • Application dated November 2007 talks extensively about the permits, regulations, licenses designed for pollution control. It also talks about pollution safeguards, plans and policies (collectively known as Best Management Practices BMPs) to prevent or address releases or spills. The information in our Application includes: • Elimination of industrial wastewater discharges associated with the asphalt plant. The asphalt plant is currently equipped with a baghouse to reduce air emissions. No water is used in the operation of the asphalt plant. • Limited equipment maintenance is performed on-site and follows company spill prevention policies. • A service truck comes to the site to perform routine maintenance. All used lubricating oil is collected by facility personnel and hauled off-site to a central collection point (waste oil is not classified as hazardous waste). The service truck carries a spill containment kit. • All storage tanks are above ground, have secondary containment and are registered with the Minnesota Pollution Control Agency( MPCA). Secondary containment consists of an impermeable concrete enclosure with a concrete base, The portion of the containment area with the used oil and fuel tanks • also has an impermeable membrane on top of the concrete, In the event of a This Company is an Equal Opportunity Employer May 1, 2008 Page 2 of 4 S tank failure the secondary containment prevents the release of petroleum products to the environment. • A Spill Prevention Control and Counter Measures Plan (SPCC Plan) has been prepared for the site. This plan documents procedures to be followed in the event of a spill or release at the site. Company policy regarding spills is that any spill of oil, gasoline, diesel fuel, lubricant, or asphaltic cement is to be reported to Paul Schultz P.G., Tiller's Land Use Coordinator, and cleaned up promptly. Any spills of 5 gallons or more of petroleum products or any volume of hazardous materials are reported to the state duty officer as required by applicable state statutes and regulations (Minn. Stat. 299K) • Topping off tanks of any kind is not allowed under company procedures. All transport piping is above ground and tanks are equipped with audible electronic alarms to prevent over filling. Warning signs and chock blocks are used to prevent premature vehicle departure. • Availability of spill cleanup equipment on-site including equipment to excavate and remove impacted soils in an expedited fashion, as well as fire 5 fighting extinguishers, absorbent pads, spill blocker dikes, empty barrels, rags and shovels. Protective measures that will be implemented as part of extraction into the groundwater include: • Stormwater routing to prevent untreated stormwater runoff from entering the groundwater lake. • Berming and/or diversion of agricultural runoff from the mining area.. • Surface water monitoring and expansion of groundwater monitoring network. All fuel and chemicals stored on site are stored in accordance with Federal and State standards. On-site fuel storage consists of a 1,000- gallon above-ground storage tank which is located within a concrete secondary containment area. When production equipment is present, an additional 1,000-gallon double walled tank is brought to the site and used to fuel processing equipment. • May 1, 2008 Page 3 of 4 S All asphalt cement storage tanks are above-ground. These tanks consist of two 40,000 gallon tanks and one 20,000 gallon tank. There is also a 20,000 gallon above- ground used oil storage tank. The used oil is used as an alternative fuel supply for the asphalt plant. All tanks are within the secondary containment area and 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 and it is classified as a Very Small Quantity Generator. The site has obtained a National Pollutant Discharge Elimination System (NPDES) Permit as required by EPA and issued by MPCA. This permit requires that the site operates under the associated Stormwater Pollution Prevention (SPP) Plan. A copy of the NPDES Permit and SPP Plan has been supplied to the City. As stated previously, the site operates under a SPCC Plan, SPCC Plan. This is • required by EPA regulations and Tiller submitted necessary portions of the SPCC Plan to the City. In addition, the site is subject to reporting requirements under the Emergency Planning and Community Right-to-Know Act (EPCRA), also known as Title III of the Superfund Amendments and Reauthorization Act of 1986 (SARA). These Acts are administered by Minnesota Emergency Response Commission (ERC) which is part of Minnesota Homeland Security and Emergency Management, a division of Minnesota Department of Public Safety. The site's ERC ID Number is 82-125-0001. The required reporting under EPCRA and SARA includes submitting a Tier II Chemical Inventory to the City's fire department. In order for the SPP Plan, the SPCC Plan and the BMPs to be successful, requires that our employees understand the plans and practices as well as be trained in implementing them. This training takes place on a continuing basis both formally and informally. The records show that Tiller has been successful preventing releases at this facility and we are confident our employees will respond effectively should a release or spill occur. Currently the three on-site wells are monitored for Diesel Range Organics (DRO) on an annual basis. Samples are collected from the production well, the potable well • that supplies the scale house, and from an on-site piezometer installed during a May 1, 2008 Page 4 of 4 previous groundwater study. In the past, results of the water analysis were sent to the County and Township on an annual basis. We plan to expand this monitoring as presented in our application and the results will be submitted to the City. For your records, I have attached copies of our SPP Plan and SPCC Plan. I have also included a brief description of our contingency plan for petroleum spills and our safety procedures for unloading liquids. Please feel free to contact me if you have questions or need additional information. I may be reached at (763) 425-4191. Respectfully, Tiller Corporation Michael Caron Director of Land Use Affairs • c: City of Scandia Kirsten Pauly, Sunde Engineering, PLLC attachments: •