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4. c Staff Report Dresel Contracting
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: Dresel Contracting, Inc. - Conditional Planning Commission Use Permit Application for a Mining Anne Hurlburt, Administrator and Processing Operation Copies To: Proj. No.: 13812.010 From: Sherri Buss, R.L.A. Routing: Date: May 2, 2008 SUBJECT: Dresel Contracting, Inc. - Conditional Use Permit Application for a Mining and Processing Operation MEETING DATE: May 6, 2008 LOCATION: Section 17, Township 32, Range 20 APPLICANT: Dresel Contracting., Inc 24044 July Avenue Chisago City, MN 55013 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 218th St. North in Scandia. The site has been actively mined since the 1960's. The operation had 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, and the recycling of concrete and asphalt. The Applicant proposes to expand the mining and operations from those approved in the previous County permit. The site includes two parcels. The western parcel is 40 acres in size, and 31 acres are proposed for mining. This parcel is owned by Dresel. The eastern parcel includes 17 acres, and 5 of these acres are proposed to be mined. The eastern parcel is owned by Franklin and Marcella Roth. The total site area is 57 acres, and 35 of these are proposed for inclusion within the active mining limits. An Employee Owned Company Promoting Affirmative Action and Equal Opportunity Scandia Planning Commission Page 2 May 2, 2008 Dresel Contracting Inc., 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; 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 using front-end loaders. Processing activities include crushing, screening, and stockpiling. The recycling of concrete and asphalt on the site also includes crushing, screening and stockpiling. The final product is loaded on trucks using front-end loaders and delivered to project sites. The main access route to and from the site is Lofton Avenue (County Road 1) to 218th Street North. Both Lofton and 218th Street are paved. The Applicant notes that blasting does not occur at the site. An estimated 750,000 - 1,000,000 cubic yards of aggregate reserves remain at the site. Annual production is variable, and the Applicant indicates that the life of the facility is dependent on market demand. The phasing plan identifies four remaining phases: la is 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. The Phase la mining area and north boundary of the Dresel Site is adjacent to the Tiller Corporation site that is also requesting a Conditional Use Pen-nit for Mining and related activities. As the two sites are mined, the Dresel and Tiller excavation areas will be joined across the boundary to form one large mining pit area. The application notes that soil borings on the site identified the water table at an average elevation of 919 feet. Excavation on the northern portion of the site is proposed to 920 feet. 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. Stonnwater collects at low areas within the mining pit floor and infiltrates. The Applicant is proposing that groundwater monitoring be conducted on an annual basis at the site, One monitoring well will be drilled on the north end of the property. The well may function as the "down gradient" well for this property, and the "up gradient" well for the Tiller property. The site has some existing berms at the site entry, and wooded areas on the northwest and northeast corners of the site. The proposed Phase 3 mining area is adjacent two wetlands on the site, No additional screening is proposed. Scandia Planning Commission Page 3 May 2, 2008 Dresel Contracting Inc., CUP for Mining 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 the 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. A series of questions that outlined these data gaps were submitted by LBG to Sunde Engineering through TKDA. Sunde responded in writing on April 23, 2008. LBG has reviewed this recent infoiniation and found that it sufficiently addresses the questions with the exception of the items presented in the general comments section in LBG's letter dated April 28, 2008 (attached). Key Groundwater-Related Issues 1) Ground-Water Elevations and Flow Direction: Observation wells have not been installed in the water table aquifer at the site. As a result, depth to the water table surface and the direction of ground-water flow in this aquifer was estimated by Sunde from on-site soil boring data that were drilled several years ago as part of the County permitting process. Sunde was unable to locate the boring logs. The borings were drilled in a triangular array, which is the best arrangement for determining ground-water flow. Sunde provided estimated ground-water elevations from the three borings in their April 23, 2008 response to LBG's questions. These elevations were based on grade elevations and depth to ground-water measurements from the engineer who prepared the County permit application (Attachment 1). These data show the ground-water elevation on site ranges from 918.6 to 919.6 feet, and flow appears to be east to west. However, the depth to water measurements were recorded only to the nearest foot making these measurements inaccurate when considering a water table elevation difference of only 1 foot between the three borings. As a result, the direction of ground-water flow at this time is uncertain. Furthermore, the Washington County Geologic Atlas (Atlas) does not provide enough detail in the vicinity of the site to conclude that flow is to the northwest and in the direction of the proposed monitoring well (Figure 2). The downgradient monitoring well proposed for the northwest corner of the site was placed with the assumption that ground-water flow is to the northwest, as is the case on the Tiller site. Based on the information currently available, LBG does not agree with this conclusion. In Sunde's response to LBG question #9 (Attachment 1), it was noted that a downgradient monitoring well will be installed to help define the ground-water flow direction, and this downgradient well will be the shared well with the Tiller site. Without ground-water elevation data from three or more monitoring wells completed in the same aquifer, the ground-water flow direction for that aquifer cannot be determined. As a result, it is unknown if the monitoring well proposed for the Dresel site will be downgradient of the quarry operations. Scandia Planning Commission Page 4 May 2, 2008 Dresel Contracting Inc., CUP for Mining 2) Monitoring Needs: The CUP Application states that the proposed down-gradient well will be monitored for diesel range organics (DRO) on an annual basis. DRO does not identify the full gasoline range organics (GRO) spectrum. If gasoline is to be used on site, then GRO and benzene should be added to the list of analytical methods. 3) Depth of Excavation Relative to Water Table: The water table surface indicated in cross section (in particular cross-section A-A') is very close to the proposed elevation of the mine floor. The CUP Applications indicates the excavation will be conducted to an elevation of approximately 920 feet amsl, which is only 1 foot above the estimated ground-water elevation of approximately 919 feet amsl. Considering the current uncertainty with the water table elevation below the site (i.e., single measurement from soil borings, unknown date, and inherent measurement error), LBG feels there is not enough evidence to support a 1-foot separation between the mine floor and water table. Fluctuations in ground-water levels may raise the water table above the base of the mine. Recommendations Given the general comments above, and from LBG's review of the CUP Application and subsequent information provided by Sunde, LBG recommends the following for the Dresel site: • There is insufficient information available to deterinine the ground-water flow direction in the sand and gravel water table aquifer. The water-level data presented from the three site borings indicates that ground water may flow from east to west. Therefore, LBG recommends that two observation wells (in addition to the shared Tiller observation well in the northwest property corner) be installed in the water table aquifer to determine the ground-water flow direction, and to assure that the shared Tiller well is truly a downgradient well for the Dresel site. Although the CUP Application requests only a minimum of one monitoring well, LBG recommends that three monitoring wells be installed because the soil boring information is inconclusive. In addition to establishing a flow direction, these wells can be used to monitor ground-water level fluctuations across the site which is important when considering the 1-foot separation distance between the water table elevation shown in cross section and the proposed excavation elevation. • Water levels should be measured in all wells monthly for 1 year and quarterly thereafter to determine seasonal variations in ground-water elevation and flow direction. Increased ground-water elevation may result in the water table rising above the proposed mine base elevation. • Figure 2 should be updated to illustrate the MN County Well Index wells in the vicinity of the site. This is in reference to Section 11 9 F that states the MN County Well Index Wells are indicated on Figure 2; which, they are not. • LBG recommends that a survey be conducted within 1/2-mile of the site to identify potential wells not included in the MN County Well Index by August 1, 2008. • LBG agrees that ground-water samples should be analyzed for DRO. However, if gasoline is to be used on site, then GRO and benzene should he added to the list of analytical methods. Scandia Planning Commission Page 5 May 2, 2008 Dresel Contracting Inc., CUP for Mining Watershed District Review of Surface and Groundwater Issues The Carnelian-Marine-St. Croix Watershed District Engineers have recommended that the District Managers approve a Permit for Dresel Contracting Mining Operations, contingent on the Applicant addressing the comments of the District Engineer. The Applicant will be required to obtain a permit from the Watershed District as a condition of the CUP. Traffic Issues The access to this mining site is via 218th Street. From information provided by the applicant, the maximum traffic anticipated is 150 trucks per day plus employee trips. Additional data suggests an average of 19 or 39 trucks per day depending upon the exact output of the site. No information was presented on the directional distribution. However, all traffic to and from the site will use Lofton Avenue to the east of the site. 218th Street is a dead-end to the west of the site. At Lofton Avenue, it is also likely most traffic will be oriented to and from the south toward Trunk Highway 97. 218th Street is a paved, two-lane local roadway. 'Trucks hauling' signs are posted to each side of the site. A single lane for all movements is provided at the intersection of 218th Street with Lofton Avenue. The existing average annual daily traffic (AADT) volume is 2,150 vehicles per day on Lofton Avenue and estimated to be much lower on 218th Street. A review of reported crashes showed only one rollover property damage crash from years 2000 to 2005. • Given the low volume estimated on 218th Street, the relatively low volume on Lofton Avenue, and the relatively low volume to and from the site, roadway changes, such as turn lanes, are not recommended at this time. Supplemental signing below the existing 'truck hauling' signs is recommended to indicate the approximate number of feet remaining to the site access point. • 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, is recommended for traffic safety as well as overnight traffic noise. Reclamation Plan 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 Permit 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 Scandia Planning Commission Page 6 May 2, 2008 Dresel Contracting Inc., CUP for Mining 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 Permit (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 Dresel 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 Dresel mining area as A-4 Agriculture. The two primary land uses in AG district 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 (includes 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 Dresel Reclamation Plan The Dresel CUP mining application includes the following documents: 1) Conditional Use Permit Application for Mining and Processing 2) Reclamation Plan in Conformance with Section 8C1 Existing Conditions (dated 4/23/08) 3) C3 Mining and Reclamation Plan (dated 4/22/08) 4) C3 A Reclamation Sequencing (dated 4/23/08) 5) C7 Concept Ultimate Use Plan (dated 4/22/08) The Drcsel reclamation plan submitted as part of the CUP application includes graphic and text submittals that address the ten points listed in the ordinance (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 and timing of operations and reclamation and shows final condition of the site. It includes a detailed description of the reclamation costs, which are estimated at 876,960 in 2008 dollars. Scandia Planning Commission Page 7 May 2, 2008 Dresel Contracting Inc., CUP for Mining The ordinance states that reclamation is to proceed concurrently and proportional to actual mining operations. Although almost the entire mining area has been opened up, the reclamation plan does not propose a reclamation schedule. The Reclamation Plan states that reclamation will continue as mining progresses in the general sequence indicated on this plan. The plan shows Reclamation Area 1 in the northeast, Reclamation Area 2 in the east, Reclamation Area 3 in the southeast, Reclamation Area 4 in the Southwest, and Reclamation Area 5 in the northwest. The south side has been reclaimed, but substantial areas eroded since reclamation commenced. These areas will need to be fixed as a first priority. This mining operation proposes to merge with the Tiller operation to the north. Therefore, this area is not shown on the Reclamation Plan. This area will need to be addressed as part of final reclamation. The ordinance lays out requirements for excavations resulting in the accumulation of substantial water areas after reclamation. The text does state that "stormwater contacting exposed areas drains internally," but the plan does not address any ponding areas within the reclaimed areas. The applicant must refine the extent and location of any proposed ponding areas. The reclamation plan states that the groundwater level at the site is 919 feet. The application is proposing to excavate to a depth of 920 feet. The CMSCWD recommends that at least a three-foot separation be maintained between the maximum excavation depth and the top of the ground water. Section 8.4 of the Mining Ordinance lays out requirements for areas which must be graded or backfilled for final reclamation. The reclamation plan does not address whether all overburden and topsoil needed to reclaim the parcel is available on site. If it hasn't been prepared, a soil balance must be prepared to determine whether adequate overburden and topsoil exists to complete the reclamation. If not, then the provisions of the Mining Ordinance relative to importation of soils and testing must be addressed. Since it is not clear whether there will be ponding areas, there could be stagnant water. 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 only proposes grasses. 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. 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. Section 8.7 of the Mining Ordinance addresses Topsoil. It prescribes the set aside of topsoil and overburden to minimize wind and water erosion. The reclamation plan does not address whether there is adequate overburden or topsoil on site to complete the restoration. This information needs to be provided by the Applicant. Section 8.8 of the Mining Ordinance addresses Structures. There are no permanent structures on the site. Temporary equipment is brought in and used as needed. All equipment must be removed prior to final reclamation. Scandia Planning Commission Page 8 May 2, 2008 Dresel Contracting Inc., CUP for Mining Issues/Recommendations for the Reclamation Plan • The parcel owned by the operators consists of 40 acres, with 17 acres to the east leased by Dresel. The area is zoned A-4 Agriculture, which allows an overall density of one unit per 10 acres. A small portion in the southwest side of the property is within the Shoreland designation. The overall number of units possible on the site is five, although there is no plan shown for the leased property to the east. The 40 acres owned by the applicant shows the 40-acres cut east/west into two lots off a short cul-de- sac on the southeast corner of the property. A site inspection of the parcel indicated the most likely places for two houses would be in the southwest corner and the northeast corner. The concept should drop the cul-de-sac and run the two lots north/south. However, 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. The reclamation plan states that no slopes will exceed 4:1, and depending upon available overburden and topsoil, the slopes will even be less. The final slopes on this site cannot exceed 4:1. • There is no indication from the information provided whether there is sufficient soil on site to reclaim according to the plan. A soil balance must be provided to the City to assure there are adequate resources to reclaim the site. If not, the applicant must demonstrate the additional volumes of material needed. • 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 Seed Manual guidelines as stated in the reclamation plan. • The separation between the lowest final grades and groundwater cannot be less than those prescribed by the City. • The reclamation plan must identify if there will be any ponding areas when the land is ultimately reclaimed. • The ordinance calls for a combination of trees, shrubs, legumes and grasses. The reclamation plan only calls for grasses. 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. Staging: The reclamation plan does not specifically address the life expectancy of the mining operation, stating instead that it is entirely dependent upon demand. Scandia Planning Commission Page 9 May 2, 2008 Dresel Contracting Inc., CUP for Mining The reclamation plan is also generalized. 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 recommends the following timing for initial restoration phases, which will be enforced through the AOP process: • There is considerable erosion in areas reclaimed on the south and southwest of the site. The first priority is to stabilize this erosion. The operator should work with the Washington Conservation District to implement the best practices to end the erosion, including mesh with seeds or other effective methods. This should be accomplished the spring of 2008. • Reclamation Area 1 will consist of backfilling, sloping and vegetating this area. This should be accomplished in the 2009 season. • Reclamation Area 2 will consist of backfilling, sloping and vegetating this area. This should be accomplished in the 2009 season. • Reclamation Area 3 will consist of backfilling, sloping and vegetating this area. This should be accomplished in the 2010 season. • Reclamation Area 4 will consist of backfilling, sloping and vegetating this area. This should be accomplished in the 2015 season, depending upon progress of mining activities. • Reclamation Area 5 will consist of backfilling, sloping and vegetating this area. This should be accomplished in the 2018 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$76,960 (in 2008 dollars) should be verified by the applicant in light of the more detailed reclamation plan reviewed here. Assuming a 15 year life span, and an annual inflation rate of 3 percent, ultimate reclamation costs in 15 years would be $1 1 1,600. 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 Scandia Planning Commission Page l 0 May 2, 2008 Dresel Contracting Inc., CUP for Mining 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. • 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 Permit. This Reclamation Plan shall he updated every five years. Screening, Bowing and Related Site Issues The updated site plan (Sheet C-1) provided by the applicant indicates the existing fencing, benning and plantings. No additional screening and benning will be required for approval of the CUP. 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, 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. Shoreland Issues Staff reviewed the Dresel Mine site plan in detail, and its relationship to the City's Shoreland Zone for German Lake. A portion of the existing "reclaimed area" in the southwest part of the site is within the Shoreland Zone. No mining is proposed within the Shoreland Zone, and is prohibited under the City's Shoreland Zone Ordinance. PLANNING STAFF RECOMMENDATIONS: The proposed plans and supporting materials provided by Dresel Contracting, Inc., 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). Scandia Planning Commission Page 1 1 May 2, 2008 Dresel Contracting Inc., CUP for Mining 2. The Applicant must receive a Stormwater Pennit from Carnelian-Marine-St. Croix Watershed District (within 90 days of approval of the CUP). 3. The Applicant shall install three monitoring wells as described in the LBG report dated April 29, 2008 (within 60 days of approval of the CUP). 4. The Applicant shall measure water levels in all wells monthly for 1 year and quarterly thereafter to deteiiijine seasonal variations in ground-water elevation and flow direction (ongoing). 5. No excavation into the groundwater is allowed under this permit (ongoing). The Applicant shall revise the Proposed Conditions Mining Plan to raise pit bottom elevations to at least 3-ft above the groundwater elevation (currently identified at 919.0-ft). Final elevations will be based on analysis of the outcomes of groundwater monitoring on the site. (Plan to be revised within 60 days of approval of the CUP). 6. The Applicant shall update plan Figure 2 to illustrate the MN County Well Index wells in the vicinity of the site (within 60 days of approval of the CUP). 7. The Applicant shall analyze ground-water samples for DRO. If gasoline is to be used on site, then GRO and benzene should be added to the list of analytical methods (ongoing). 8. 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). 9. 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). 10. 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 require approval by the City, will form part of the basis for approval of the Annual Operating Peiniit. This Reclamation Plan shall be updated every five years. 1 1. The Applicant must obtain an Annual Operating Permit from the City. (Application for the AOP must be completed within 60 days of approval of the CUP, and application made annually). 12. 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 conduct a survey to identify and map potential wells within 1/2-mile of the site to identify potential wells not included in the MN County Well Index by August 1, 2008. Scandia Planning Commission Page 12 May 2, 2008 Dresel Contracting Inc., CUP for Mining 2. The Applicant shall provide supplemental signing below the existing 'truck hauling' to indicate the approximate number of feet remaining to the site access point. 3. The Applicant shall provide field delineation and report for the two wetlands adjacent to the pit. The Applicant shall maintain an undisturbed buffer area of at least 50-ft for both of these wetlands until wetlands are delineated and potential impacts and requirements are determined by the Carnelian- Marine-St. Croix Watershed District. 4. 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. ACTION REQUESTED: The Planning Commission can: 1. Recommend approval as written; 2. Modify and recommend approval 3. Recommend denial if it is found that the request is not consistent with the Comprehensive Plan, CUP criteria and Mining Ordinance Criteria, and is 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 \ \ II h corn April 29, 2008 Ms. Sherri Buss, R.L.A. 1500 Piper Jaffray Plaza 444 Cedar Street St. Paul, MN 55101-2140 Re: Hydrogeologic Evaluation Aggregate Mining and Processing Operation Dresel Contracting, Inc. City of Scandia, Minnesota Dear Ms. Buss: Leggette, Brashears & Graham, Inc. (LBG) was retained by TKDA to review the Dresel Contracting, Inc. (Dresel) 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 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 Dresel for the aggregate mining and processing operation (site) located on the west side of Lofton Avenue in the City. The location of the site is shown on Figure 1. LBG conducted an initial review of the 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. A series of questions that outlined these data gaps were submitted by LBG to Sunde through TKDA. At the time of our initial review, the information that was either missing or incomplete included: boring logs and a map showing their locations, Figure 2, the accuracy of ground-water elevations, survey data, and whether a water supply well was located on site. Sunde responded in writing on April 23, 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 including revised plan view maps (Cl and C2) and Figure 2. CONNECTICUI•01110*IL 1 INOIS•SOUTH DAKOTA•PEINNSY1 VANIA•FLORIDA•NEW JERSEY•TEXAS WISCONSIN•NEW YORK•MISSOURI•VT NMONT•MICII1G\ Ms. Sherri Buss 2 April 29, 2008 General Comments I) Sunde Responses to LBG Questions: The supplemental information provided by Sunde (see Attachment 1) in response to LBG's questions should be included in the CUP Application. 2) Section II 9 F - Figure 2: Wells from the MN County Well Index are not shown on Figure 2 as stated in the text. Sunde should include these wells and the findings from other well search sources. 3) Section II 9 G, 0, P - Ground-Water Elevations and Flow Direction: Observation wells have not been installed in the water table aquifer at the site. As a result, depth to the water table surface and the direction of ground-water flow in this aquifer was estimated by Sunde from on-site soil boring data that were drilled several years ago as part of the County permitting process, Sunde was unable to locate the boring logs. The borings were drilled in a triangular array, which is the best arrangement for determining ground-water flow. Sunde provided estimated ground-water elevations from the three borings in their April 23, 2008 response to LBG's questions. These elevations were based on grade elevations and depth to ground-water measurements from the engineer who prepared the County permit application (Attachment 1). These data show the ground-water elevation on site ranges from 918.6 to 919.6 feet, and flow appears to be east to west. However, the depth to water measurements were recorded only to the nearest foot making these measurements inaccurate when considering a water table elevation difference of only 1 foot between the three borings. As a result, the direction of ground-water flow at this time is uncertain. Furthermore, the Washington County Geologic Atlas (Atlas) does not provide enough detail in the vicinity of the site to conclude that flow is to the northwest and in the direction of the proposed monitoring well (Figure 2). 4) Section II 9 P - Downgradient Monitoring Well: The downgradient monitoring well proposed for the northwest corner of the site was placed with the assumption that ground-water flow is to the northwest, as is the case on the Tiller site, Based on the information currently available, LBG does not agree with this conclusion. In Sunde's response to LBG question #9 (Attachment 1), it was noted that a downgradient monitoring well will be installed to help define the ground-water flow direction, and this downgradient well will be the shared well with the Tiller site. Without ground-water elevation data from three or more monitoring wells completed in the same aquifer, the ground-water flow direction for that aquifer cannot be determined, As a result, it is unknown if the monitoring well proposed for the Dresel site will be downgradient of the quarry operations. 5) Section II 9 P: The CUP Application states that the proposed downgradient well will be monitored for diesel range organics (DRO) on an annual basis. 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 analyte list. 6) Section II 9 N: It looks like the reclamation surface elevations are presented on Figure C3, not C4 as indicated in the text. . . Mo. Sherri Buss 3 April 29, 2OO8 7) Section 00 7 - Depth of Excavation Relative to Water Table: The water table surface indicated in cross section (in particular cross-section /\'/\') is very close to the proposed elevation of the mine floor. The CUP Applications indicates the excavation will be conducted (ounelevation o[approximately 92O fee( unnm|, which is only | 6`o1 above the estimated ground-water elevation of approximately 919 feeti uno Considering the current uncertainty with the water table e�vu km below the site (i.e., single measurement from soil borings, unknown date, and inherent measurement crror), LB{; feels there ix not enough evidence io support u ]-foot separation between the mine floor and v/u\er tuh|c. RucUuuhouo in ground-water |ovolu may raise the water table above the huno of the mine. It is also unclear (see Coonroeo{ #3 on Emmons 8L Olivier Resources Memorandum dated March }\, 2008) whether the base of the Drexc! mine iu \ohc included in the extension o[a ground-water lake created on the Tiller site. Recommendations Given the general connrncn1x above, and from our review of the ClIY Application and yuhnequcniio5nnnuhonpvovidedbySundc, LBGnccornnncndxthrfbUowiog5nr|h^ Dncec\ ai\c. )) There is insufficient in6znnu6on available to de\cnoioc the gnnvod'wa|cr flow direction in the xuod and gravel water table aquifer. Thewatcplovc\ data presented from the three site borings indico1cx that ground v/uicr may flow from east to wcoi Thcrcfbno, i8C reonnunncndm that two observation ncUa (in addition to the shared Tiller observation well in the northwest property corner) be installed in the vvutor (uh|c aquifer to determine the ground-water flow direction, and /o assure that the shared Tiller well is truly x Uowngrudien{ well for the Droac\ site. Although the CUP Application requests only u minimum of one monitoring well, LBG recommends that three monitoring wcUu be installed because the soil boring information ininconclusive. }n addition (o establishing x flow direction, these wells can be used to monitor ground-water level fluctuations xcnaou the site which is important when considering the l'fhol separation distance between the water table elevation shown in cross section and the proposed excavation elevation, 2) Water levels should be measured in all wells monthly for | year and guurto1v th ereafter to determine acaaonu| variations in ground-water elevation and flow direction. Increased [noroaxcd ground-water elevation may result in the water table rising above the proposed noioc base elevation. ]) Figure 2 should hc updated 10 illustrate the MN County Well Index wells in tile vicinity of the site. This is in reference to Section U 9 F that $a(ox the MN County Well Index Wells are indicated on Figuro2; which, they are not, 4) [BG recommends that a survey be conducted within 1/2'oni|c of the site to identify potential wells not included in the &4y� County Well Index, 5) LB6 agrees that ground-water samples should be analyzed for DRO. |kxvcvcr, if gasoline is \obcused on site, then GROand benzene should bcadded N the unu\y|c \ixi Ms, Sherri Buss 4 April 29, 2008 The recommendations provided above do not include those presented in a Memorandum by Emmons & Olivier Resources (EOR), dated March 31, 2008. LBG advises that Dresel 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, 1 David S. Hume, P.G. Senior Associate Reviewed by: J. Kevin Powers, P.G. Principal DSH:kw Attachment s\Tcch\Scdodid Aggrcgdir\DrcNcl,DreNel CUP re,le, final)do, FIGURES LEGGETTE, BRASH EARS & GRAHAM, INC. • ,,'; I �r a '>s it - l _ j Ir rm„ - h I F V4 \C A 1 ; ,P r - i•' 4 , i �� z e \ „ t1 . 1 s', ..' _•' - e Goaee LakB ._. I., J+ A ,r 4 . �,r, 7} .�. ' - oA Ik is ( cz t k7,k, ,ta h '7h \ ,t r 11 ''f,'' /,.a:" I` „. ••x. g t t i; z:: l 1 Dresel Mine Site ' , f (,,c 18 A>tiJ ct 4'y .. ` r _ .., ( A) j' 7 IaV' 1 T. ti ..-,, 16 wt._ ' Ir i/ ` F H1,11? l " ` W c.' 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DRESEL CONTRACTING,INC.MINE L ° Processional Ground-Water and SCANDIA,MINNESOTA BG F Environmental Engineering Services DRESEL AGGREGATE MINE LOCATION 9 Pine Tree Dove,Suite 250 CITY OF SCANDIA,MINNESOTA Si Paul,Minnesota 55112 (651)490-1405 FILE: G3SCANDO1E.MXD 1DATE: 04/28/2008 !FIGURE: 1 CO t.L..1 I-- " co CO X CC D (l 9ij. LT- < Ow D — e,,,.'( Z Z z co Li.(5 2 -1 0 Z L Li >-L)--' 0 Z I I 1 C E a 0 6 6-2 F., z -- , -E• -2' Q . c, 2 ','.• t• ; r!, <1.1 0 o a 0 Z -- g] t ,1.2 .. . , ,..... 74 ,-,.% '`-j 4 04 ' )) f..4 < ''''''' :a 0 -C.: 5 1:4i ,_ r74c / 8 t 1 ,.,?,`"' 77, •-:, p :f--. Z .F.., E I., V t '.-.-.;t, E. I— ca-fftil 1 cf,-- g I:0 .6: ,-,-; g 8 ' ,,, . v - ,.':` - g...y .;,,' ,,, 0 -,'" N. t .-. .4 CE1 2 -': < o -.E c ,6 -t 4,, ,, ,-... .. i ..s.,.; ,a- eet :' 5- g ...e. - 1 - <4 I I.7-F' :,., V''' 9' I ',,::, ( Lu 1-- .t. . g to F. ."" .'-i'' '; '''' '''' ..2. ',..A.4. .1., •'- i E? g ,•-.-",, '::::. >. .,\ .6' •,,, ?2 , E ,.'. ..:g - v - o,. i I w z g.6 ,; ,.. - E-. < 7% ,4-4 < g Cl) v,,-,7- (.7 ,..o:.,.,.';',D,, >°,_,- -? q ,<!-,3 -;:q. -4t g ,..'' .... . ;z4 qi"-----1-,‹ f.,,,-',.....,-. 73—,--i ,, ,,.. -'-*'''' , ,— ' ...., ---.- , , • 3 ' \ •-& - ;-T'4 ' •"' A —A Si/ .. ' :..• ,• L 1 `-' C,7 I (..7 c.T. ,..) I" 7,2' - - 6 - 't r 11...4 , a..4 1i en (.)2 i Y g_ 0)0) 0— 7,5 U Q) 0 (DC >,U 0 CL -") „ 1 8 >, — , 2, ? 0)c C (i) E Y 0 cz r- u5 8`n ATTACHMENT 1 SUNDE RESPONSE TO LBG DATA REQUEST LEGCETTE, BRASHEARS& GRAHAM, INC. This summary focuses on data that is missing and required for LGB, Inc.to complete the Hydrogeologic evaluation of the identified site. ...- Dresel Site 1) Please provide a copy of Figure 2. Not received by LGB. ct.-44'j A copy of Figure 2 is attached, 2) Please provide soil boring logs that were not included with the CUP. Not received by LGB. The soil borings were drilled several years ago as part of the County permitting process. aik We have been unable to locate copies of the logs. We were able to obtain some information from the engineer that prepared the County permit application (see item 4). 3) Boring locations are not shown on Figure 2 as indicated in text in Section 90. Please provide a map showing the locations of the soil borings. The Site Plan, C2 has been revised to show the three soil boring locations. ,es 4) Are there survey data for the soil borings(i.e., grade elevation at the boring location when it was drilled)? if so,please provide. This will help determine/ verify the accuracy of the groundwater elevations used to estimate flow direction. Survey data and water level information for the soil borings is from W.White, PE. Boring# Surface Depth to Water (\ ,,c Water Table B-1 939.6 21' , _I,/ 918.6 B-2 945.9 27' fto 918.9 1-x; 942.6 23 vis`pc 919.6 (a--J • 5 5) What What time of year(month) were the borings drilled if not indicated on the logs? GL/ (0 41 We do not have any information regarding the time of year that the borings were drilled. rit4 6) Were the borings completed as temporary piezometers that depth the groundwater levels were measured? If so, are there survey data for these wells and provide a map showing there locations. No piezometers were not installed, 7) What time of year were the initial depth the groundwater levels estimated in the borings or wells? 4/7 We do not know what time of year the water level measurements were made. 8) How was depth to groundwater determined from the borings? The distance from the surface of the borehole to the level of water encountered in the 17 borehole was measured. 9) Section 9D requests a map of the groundwater depth, but this is not shown on Figure Cl. Has a groundwater flow map been created? If so, please provide. . . � � A note has baon added stating that based on borehole information the groundwater elevation for the site io about B19.O feet above mean sea level, A ground water flow map has not been created. Installation cfa down gradient monitoring well will help tn define-' �( the groundwater flow. 10) Hbw was the elevation my groundwater determined as illustrated on cross-section A-A', B'B^' C'C, and D'D'on plates C5 and C6? � Groundwater elevations illustrated on the cross-sections were based on site boreholee- information and water table information found in the Geologic Atlas of Washington ^ County. K4innesobu (Count/AJ|asSodeo. Al|asC'5. UnivamityofMinn000ta. SLPau|. 18SO)and available information from the Tiller n|hy site, 11) The CUP states that there are nomonitoring wells currently on site(Section 9P), Is it true that there are nu water supply wells mnm/te? /f there/sm water supply wa8(s)'please provide location map and well/og*4. There are nu monitoring wells currently onoito, There iea water supply well associated with the residence on the very eastern portion of the site, but we do not have any well log Kirsten Pauly, PE/PG,Principal Brian I-1, Mundstock, PE,Principal IS Mike Kettler, PE, Principal • 4,4441At Consulting Civil Engineers January 15, 2008 Steve Thorp Scandia Code Official City of Scandia 14727 209th Street North Scandia, MN 55073 Re: Dresel Contracting, Inc. Application Submittal Dear Mr. Thorp: Please find the enclosed additional information that you requested upon review of the Dresel Contracting., Inc. application for a permit to mine sand and gravel in Scandia. Based on the December 10, 2007 review letter and our January 3, 2008 meeting with 1111 City staff, the following additional items are included with this submittal: 1. 2 sets of full size engineered drawings signed by the engineer of record 2. Above maps at scale of at least 1"-= 200'. 3. A survey signed by a registered land surveyor depicting monuments set and the external boundaries of and dimensions of the parcel. We have included a surveying worksheet for the property, however, we were unable to locate a certificate of survey. We are requesting that as a condition of the permit the applicant supply the City with a certificate of survey by May 1, 2008, so that we can have a survey and the monumenting performed this spring. 4. Cleary defined setbacks: Setback information, including distance to occupied structures has been added to Sheet C2. 5. Flood Elevations are required: A note has been added to sheet C2 that references the fact that the site is not located in an area prone to flooding as indicated on the preliminary flood insurance rate maps. 6. SWPPP: A copy of the SWPPP plan for the Dresel Contracting site is included in this attachment. 7. A note was added to sheet C4 that indicates the common mining border between Tiller Corporation's property and the Dresel Property will be mined in 2008 or thereafter. • SUNDE ENGINEERING, PLLC 10830 Nesbitt Avenue South • Bloomington, Minnesota 55437-3100 Phone: (952)881-3344 • Fax: (952) 881-1913 • E-Mail: infora sundemil corn • The additional information resulted in revisions to sheet C2 and C42. We have enclosed twenty copies of the revised plans on 11X17. If you have any further questions, please do not hesitate to contact me. We look forward to the remainder of the permitting process. Sincerely, . ---- Kirsten Pauly, PE/PG SUNDE ENGINEERING, PLLC cc: Josh Dresel 41110 4111 Kirsten Pauly,PE/PG,Principal Brian Mundstock,PE,Principal \Ww.malia Mike Kettler,PE,Principal • r,Tdwnswwfcwrcl Consulting Civil Engineers April 23, 2008 Sherri Buss City of Scandia Planner TKDA 444 Cedar Street Suite 1500 Saint Paul, MN 551010-2140 Attached please find the additional information regarding Dresel Contracting's CUP for mining operation requested in your March 27, 2008 memo. 1. Concept Ultimate Use Plan: This plan illustrates one potential use of the property after reclamation. This plan is conceptual only. Future development of the site may be agricultural 4111/ or some other development that is in accordance with land use regulations at the time of development. Future development will require a formal application and approval by the City of Scandia. la. Reclamation Phasing C-3A: Attached is a reclamation phasing plan that illustrates where slope stabilization has occurred and the sequence of future restoration areas. Backfilling and stabilization of sideslopes will occur as mining along the perimeter of the mining areas is completed. The floor of the mining area will continue to be utilized for processing and stockpile area throughout the life of the mining operation. Perimeter berms will be utilized in final restoration grading work. This plan will be reviewed and updated as needed as part of the annual operator's permit. 2. Soil Balance calculation: Clean soils are imported to this site and used for backfilling and restoration activity. The operator utilizes the various materials contained on-site on various local jobs. Excess soils from these jobs are backhauled to the site and utilized as fill material. Approximately 300,000 cy of material will be needed to complete restoration. Sunde Engineering, PLLC. 10830 Nesbitt Avenue South • Bloomington, Minnesota 55437-3100 Phone: (952) 881-3344 • Fax: (952) 881-1913 ° E-mail: info@sundecivil.com . . Ms. Sherri Bus 4/Z3/IO08 Page ]. Seed Mixtures: — The Mining and R8ClaO18t)OD Plan, C-3, has been revised tOinclude seed mixture and maintenance information. 4. Traffic Information: The volume Ofmaterial [2ODOVSd from this site varies from 0'100/000rv/V2a[. The table below illustrates the estimated average daily tr8��CfrOrD the '[GSel site based OD 50,000 C»/y8aF8Dd 100,000 r»/ye8[. Material is also hauled into the Site for recycling and reCldrnadOD activities. This FD8te[i8/ is t«OiC8l/V brought into the site and then the truck is loaded with material to P8t 'FO to the job site SO it dD2S not represent additional truck trips. The r03xiDluD1 daily truck traffic is estimated to be 150 truck trips per day. Vo|ume (oy) Tons Truoko/yr Trucks/day Trips/day trucks/hour tripo/hr 58.000 ' 70.000 3.500 10 39 2 3 100.000 140.000 7.000 38 78 3 6 Average traffic io based nnan8 month construction season 5 days o week. 180cnnu\ruodon days, 12 hours/day Avg nf20tons/truck � 5. HydnJgeO|Ogi[ information: This iOtU[DlatiOn is submitted under separate cover. Ki[Sten Pauly, PE Reg. NO21842 SUNOE ENGINEERING, PLLC I Dresel Contracting, Inc. Scandia, MN Stormwater Management Calculations 3/2008 agoWNIMINa 111 SUNDE ENGINEERING,PLLC. 10830 Nesbitt 5 tAve5nu4e37S, 003uitho Phone:BlBloomington, ‘452) 881-3344 Fax:(952)881-1913 Dresel Contracting, Inc. 3/2008 New Scandia, MN NM Summary • The Dresel Contracting, Inc. sand and gravel mining facility is an active mining operation located on the NW corner of the intersection of Lofton Ave. and 218th Street in New Scandia Township. The mining operation is situated on a 57 acre site in the City of Scandia. The site is located within two separate watershed districts, the Carnellian-Marine-St. Croix WD, which covers the western 3/4 of the site and the Forest Lake-Comfort Lake WD, which covers the eastern 1/4 of the site. The boundary between the two watershed districts is not based on a watershed divide. It is established based on parcel boundary lines. Existing (Interim) Condition: The site has been actively mined for the past several years. The area to be disturbed by mining encompasses 35.5 acres. Approximately 31 acres within the mining limits has been disturbed from mining activity. Currently, the majority of the disturbed area drains internally to low areas within the site. Collected water infiltrates and evaporates and is not discharged from the site. The locations of these low areas move throughout the site as mining activity moves throughout the site. Screening berms have been established around the perimeter of the site. The outer portions of these berms drain off-site. Existing berms are stabilized with well established vegetation. Portions of the site have been stabilized by sloping and establishment of vegetation. There is a wetland located just west of the mining limits. According to the plans prepared as part of the Washington County permitting process for this site, the wetland was delineated in the field by Tim Fredbo water resource specialist, Washington Soil and Water Conversation District. The area adjacent to the wetland has already been mined. The area has been sloped and vegetation established to stabilize the slope. Hydrologic computations have been prepared which evaluate the current condition of the site as well as the final reclamation condition of the site. Essentially the current condition also represents the interim or operating condition of the site. Past mining has redirected original site drainage to an internally drained condition over portions of the site that have been mined. The interim condition will continue to change as the remaining portion of the site is mined to completion. The calculations illustrate the current sub-watershed areas and evaluate stormwater runoff entering the site, leaving the site, and remaining within the site. Curve numbers of the mapped soil types per the Natural Resources Conservation Service were used for all drainage areas except the pit (Drainage Area 1). The pit was assumed to be type "A" soils and a newly graded area • Stormwater Management Calculations Dresel Contracting, Inc. 3/2008 New Scandia, MN NM • which has a CN of 77. For the Final (Restoration) Condition, type "B" soils were assumed for a grassed area with greater than 75% grass cover (CN 61) for the pit. Final (Restoration) Condition: Final reclamation will leave the site as open space with the slopes and floor stabilized with established vegetation. There will be no increase in rates of runoff leaving the site into the various subdrainage areas outside of the limits of the Dresel and Tiller mining areas. Instead of draining internally, as in the interim condition, the perimeter slopes and floor of the reclaimed mining area will drain to the north to the water body created by the adjacent Tiller Corporation's mining operation. There will be no hard surfaces associated with the reclamation condition, therefore no permanent stormwater management facilities will remain on-site after reclamation. When final development eventually occurs on this site, appropriate stormwater management, sedimentation and erosion control plans will be prepared to reflect the proposed final development. Table 1 Existing/Proposed Conditions Existing Reclamation EX1SITNG Peak Flows(cfs) RECLAMATION DA Area(A) Drainage Area(A) Drainage T 2 Yr 5 Yr 10 Yr 100 Yr 2 Yr 5 Yr 10 Yr 100 Yr 1 31.14 internal 39.99 offsite** 34.49 - 53.54 73.93 129.56 3.44 8.24 14.63 35.92 2 5.22 offsite 4.42 offsite 2.58 5.26 8.39 17.72 3.32 5.94 8.88 17.38 3 14.4 into/through 12.04 into/through 2.07 5.25 9.42 22,97 1.86 4.75 8.53 20.75 4 5.92 offsite 5.17 offsite 0.25 1.12 2.55 7.89 0.16 0.82 1.98 6.47 5 3.83 offsite 2.9 offsite 0.00 0.00 0,02 0.30 0.00 0.00 0,01 0.16 6 0.66 offsite 0.66 offsite 0.03 0.17 0.40 1.20 0.03 0.17 0.40 1.20 7 6.97 internal 3.66 internal 0.03 0.24 1.12 6.12 0.00 0.01 0.05 1.00 8 4.79 into/internal 2.06 into/internal 0.13 0.61 1.44 4.69 0.01 0.11 0.47 2.28 Total 72.93 70.9 39.58 66.19 97.27 190.45 8.82 20.04 34.95 85.16 *See Attached Existing and Proposed Conditions Maps for Details **Upon final reclamation, the mining area will drain to the north into the Tiller lake. Type "A" soils for a newly graded area (CN-77) were assumed for Drainage Area I (Gravel Pit) for the Existing Conditions. Type "B" soils for> 75% grass cover(CN-61) were assumed for Drainage Area I (Reclaimed Gravel Pit) for the Proposed/Reclamation Conditions. All other drainage areas reflect soil conditions mapped by the USDA - Natural Resources Conservation Service. Please refer to attached Soils Map for details. • Stormwater Management Calculations . . . [)mesc}Contracting, Inc. 3/2008 New Srandia, MN NM Table 2 Offl'teDrainage sXISITNG RECLAMAT10N --'bA-- 2Yr 5Yr 10Yr 100Yr 2Yr 5Yr 10Yr 100Yr 1^ 34.48 53.54 73.83 ' 129.58 3.44 8.24 14.63 35.92 2 2.58 5.26 8.38 1772 3,32 5.94 8.88 17.38 3 2.07 525 �� ��� 1�� �� ' �B ��75 4 0�25 112 �55 �89 �10 �82 1.98 O�7 ' 5 0.00 0.00 0.02 O�30 0.00 0.00 0�01 06 0 0.03 0.17 0�O 1�2O [iO3 0i17 OAO 1.20 � Total 39.42 6534 94.71 179.64 8.81 19.92 34.43 81.88 *Upon fiou|reclamation, the mining area will drain to the north into the Tiller lake. Proposed/Reclamation conditions offsite drainage does not exceed prc' dcvclnpmen\/existingcooditiouooffsitcdruioogc. Wetlands: There is one wetland basin located west Of the DrUDO5ed D1iDiOO limits. The dcdiD8g8 area of this basin will be reduced OS a result Of mining DD8r8tiOOS. However, because the soils within the portion of the drainage area to be [eDlOVed are D8[OO8@bl8 in DDtVF£, they [8SUlt in V2rV little runoff for the day to day storm events. Therefore, renlOv8| of drainage areas with permeable soils has very Very little impact during frequent day to day tvD8 [8iD5tO[Dl events. It is during less frequent (i.e. 100 Y[) events where soils b8CODl8 saturated that there begins to be 8 substantial difference between the existing and D[OOOs8d conditions. The analysis shows that for frequent rOinStOFDl events, the impact tOthe VV8tl8Dd basin will not be significant. Be[8VS8 the more frequent events SUSt8iD the Yv8t(aOdS/ there should be DO substantial indirect i[DD8[t to the wetland basins as a result Ofthe mining ODeFOtiOD. Table 3 Wetland Impacted by Mining Wetland Drainage Drainage Volume of Volume of Runoff Volume of Runoff(of) (of) Runoff(of) Area (A) Area (A) 2YrEvent 5YrEvent 10YrEvent Existing Reclaimed Existing Reclaimed Existing Reclaimed Existing Reclaimed . . 1 19.02 18.40 46.646 43.709 88.327 82.701 93.042 84.122 *Drainage area 10 the wetland, are areas 2 and 3. Siornov/uter Management Calculations Dresel Contracting, Inc. 3/2008 New Scandia, MN NM • With respect to specific items in the January 23, 2008 comment letter from the Comfort Lake Forest Lake Watershed District the following information is provided: 1) There is very little information provided in order to evaluate the site's overall impact on the surrounding environment with respect to the goals and policies in the Comfort Lake — Forest Lake Watershed District's Watershed Management Plan: With respect to the policies of the Comfort Lake Watershed District, the site has operated and will continue to operate in a manner to protect adjacent wetlands and waters from significant degradation and to protect wetlands and waters from significant wetland alteration, to maintain existing water uses, aquatic and wetland habitats and the level of water quality. Specific District goals relevant to this site include water management and wetland management. Water management goals include preservation and use of natural storage and retention areas to control excess volumes and rates of runoff, preservation of groundwater recharge areas, measures to protect surface and groundwater quality, and monitoring of groundwater • quantity and quality throughout the duration of mining operations. The site operates under a Stormwater Pollution Prevention Plan. This plan has been developed to prevent stormwater that has contacted stripped areas or exposed soils from discharging from the site untreated. The mining operation creates storage and retention areas helping to control excess volumes and rates of runoff. The majority of stormwater is infiltrated, preserving groundwater recharge areas. Groundwater monitoring will be conducted to insure protection of groundwater quality. Wetland goals include protection of District wetlands in accordance with existing rules and regulations using watershed based management activities and restoration. The wetland basin located west of the mining limits was field delineated as part of past permits with Washington County. Mining adjacent to the wetland has been completed. The excavation slope has been backfilled, sloped and stabilized with vegetation. 2) The site operates on two parcels on 57 acres of which 36 acres are within the active mining limits. • No response needed. Stormwater Management Calculations Dresel Contracting, Inc. 3/2008 New Scandia, MN NM • 3) Only one wetland indicated in the site plan has been field delineated. In order to determine the types, sensitivities, and overall values of the wetlands on site, they all should be field delineated. Further, CLFL WD recommends that all wetlands be protected with buffer zone to be maintained outside the outer wetland boundary. The site maps do not indicate buffer zones. The only wetland basin not delineated in the field is indicated as PUBGx on the NWI maps. According to the operator, this basin was created as part of the mining operation and has subsequently been removed through the course of additional mining. A minimum twenty foot natural vegetation buffer zone will be maintained around the existing wetland. Work adjacent to the wetland has already been completed in accordance with the permit from Washington County. The active mining face adjacent to the wetlands has been backfilled sloped and vegetated. Please refer to the Drainage and Erosion Control Plan for details. 4) There is no stormwater rate and volume modeling completed for the site. In order fulfill goals included within the District's Watershed Management Plan, interim and post-use (reclaimed)stormwater rates from the site for a 24-hour precipitation event with a return frequency of 2, 5, 10, or 100 years should not increase from pre-use conditions. • Further, increased runoff volumes can cause downstream flooding or exacerbate existing flooding concerns and can alter the hydrology of downstream wetlands. In order to alleviate these concerns and fulfill goals included within the District's Watershed Management Plan, the project site (existing, interim and reclaimed)should be designed to maintain existing runoff volumes for the 2-year event(2.8 inches). Stormwater rate and volume calculations have been preformed. The results are presented in the Existing/Proposed Conditions section of this report. Also, please refer to HydroCAD output for further detail. Exisiting conditions are the same as interim conditions as the site is currently operating. 5) There are no water quality models in order to determine pre-use, interim and post-use (reclaimed) phosphorus loads from the site. Submittal of a water quality modeling analysis of the site (using a model such as P8 or a method found in Appendix L of the Minnesota Stormwater Manual "Simple Method of Determining Phosphorus Export," for determining the pre-use and post-use nutrient loads from the site) would specifically address this concern. Currently there are no water quality models modeling phosphorus removal and loads because modeling them is based on ponding. There is no ponding • Stormwater Management Calculations Dresel Contracting, Inc. 3/2008 New Scandia, MN NM proposed for the interim and post-use conditions for offsite drainage areas, therefore phosphorus loads are not able to be modeled. What can be said generally about the phosphorus loads from the site are that as mining continues to the north, east and west phosphorus loads leaving the site will be reduced as the drainage areas are reduced in size. Ultimately the reclamation condition will have less of a phosphorus load leaving the site than the pre-mining (with agricultural land uses) conditions. 6) The watershed will also request design and construction details for the proposed BMP's mentioned in N. as well as detail as to where and when those BMP's will be used. Please refer to the SWPPP and the Drainage and Erosion Control Plan for additional information. 7) In order to review the sites groundwater component/interaction, the watershed will request a copy of the groundwater monitoring plan, spill response and emergency response plans, and results of past groundwater monitoring that have been conducted. Please refer to section O. and P. in the Conditional Use Permit Application. • Ground water monitoring has not been conducted in the past at this facility. Although a comment letter was not received for this site from the Carnelian — Marine — St. Croix Watershed District, responses to comments they had in their Bracht Bros., review are provided. 1) The submittal information received on January 18, 2008, is acceptable as far as general information on proposed operations and narrative requirements but lacks the specific information and detailed plans and design information the district will need to evaluate the project. a. Provide a wetland buffer plan. Vegetation will be maintained for a minimum of twenty feet between wetland and mining limits in order to provide a buffer to the wetland. Please refer to the Drainage and Erosion Control Plan. b. Provide detailed drainage plan and supporting computations documenting that rates and volumes discharged off site are not increased over pre- settlement conditions; for the interim mining phases and final site at completion of mining activity. To estimate pre-settlement conditions district will accept assumption of existing conditions topography, "A"soils or mapped • Stormwater Management Calculations Dresel Contracting, Inc. 3/2008 New Scandia, MN NM existing soil types. A native prairie land cover should be assumed for the • areas that are currently being mined. Drainage plan subwatershed maps and computations need to include off-site areas that drain to the property. Please refer to the following stormwater management calculations, exhibits and HydroCAD modeling for a detailed drainage plan. Assumptions are described in this summary and throughout the report. c. Design information for water quality features needs to be provided. The site utilizes internal low areas to collect stormwater within the floor of the mining area. The locations of these low areas change as mining progresses. The basins are not designed to any standard because stormwater does not discharge off site. Please also refer to the SWPPPP for the site. d. District will expect drainage plan and models to be of sufficient detail to also evaluate expected impact to on-site wetlands. Please refer to the following stormwater management calculations, exhibits and HydroCAD modeling. e. Drainage and erosion control plans need to include construction details for installation of stormwater management and erosion control practices • (proposed SMP's). Design information on size of proposed practices and when they will be placed and how they will be maintained will also be required. Please refer to the Drainage and Erosion Control Plan. Currently screening berms are in place. Also, as mining progresses through silt fence will be added per the Drainage and Erosion Control Plan. Please also refer to the SWPPP. f Provide copies of the groundwater monitoring plan (include reports on past monitoring activities under previous County permit), spill response plan and emergency response plan. Please refer to section O. and P. in the Conditional Use Permit Application. Also, please refer to section 14, Contingency Response Plan. Ground water monitoring has not been conducted at this site. Stormwater Management Calculations STORM WATER POLLUTION PREVENTION PLAN FOR DRESEL CONTRACTING, INC. Scandia, Minnesota Permit number MNG490000 A. GENERAL This plan has been prepared in compliance with the provisions contained within the National Pollutant Discharge Elimination System (NPDES) and State Disposal System (SDS) Permit MN G490000 for Construction Sand and Gravel, Rock Quarrying and Hot Mix Asphalt Production Facilities. The subject site is a sand and gravel mining operation. This plan shall remain on-site, or if there is no suitable on-site storage location, may be maintained at a readily available off-site location, and will not be submitted to the Minnesota Pollution Control Agency unless requested. B. Site Map A site map is attached which illustrates the following items: Township Range and Section, topography, wetlands, streams, ditches, lakes and • other nearby surface waters, identification of DNR designated trout streams, outstanding resource value waters (OVRW's) and the Clean Water Act, Impaired Waters within one mile of the site, water wells, surface water supply intakes, pit dewatering points, direction of stormwater runoff from the site and name of surface water that receives any surface discharge. The plan also illustrates significant materials storage areas. There are no impervious surfaces within the mining area. There are no OVRW's or DNR designated trout streams within 1 mile of the site. An Impaired Water, Bone Lake, is located 4600 feet northeast of the site. Most stormwater drains internally to low points within the site's mining limits. A small area within the northeast mining limit boundary drains to low points outside of the mining limits, but still within site boundaries or immediately adjacent to the site. A small area in the western portion of the site drains to the wetland located partially onsite to the west-southwest. C. POTENTIAL SOURCES OF POLLUTANTS The following are potential sources of contamination of storm water at the site. • 1. Excavation areas: Sediment picked up in runoff contacting areas stripped in preparation of mining activity as well as exposed mining faces and pit floor. 2. Portable crushing and screening equipment operate periodically at the site. Leaks from equipment used at the site have the potential to contaminate stormwater. 3. Materials Storage areas. There are no chemicals or explosives stored on-site. Topsoil, overburden, natural aggregates and recycled asphalt and concrete are significant materials stored on- site. 4. Conveyors are not operated at this site. 5. Material loading occurs on the pit floor directly from the active face or from processed aggregate stockpiles located on the pit floor. 6. Roads and vehicle parking: All internal haul roads are gravel surfaced. There are no designated parking areas. 7. Fuel storage and fueling: All storage tanks are above ground and have secondary containment. • 8. Vehicle and equipment maintenance activities are performed on- site. No engine degreasing is performed on-site. 9. Equipment washing is not performed on site. 10. Buildings: There are no buildings associated with the mining operation. 11. An asphalt plant is not associated with this operation. Therefore there is no asphalt storage, truck box lubrication or cleaning, wet scrubber discharge or sediment and sludge storage from asphalt plant operations occurring at this site. D. PRACTICES TO REDUCE POLLUTANTS IN STORM WATER DISCHARGES FROM THE SITE Perimeter controls Best Management Practices (BMPs) implemented at the site which control stormwater and prevent it from discharging untreated from the site include silt fence and perimeter diversion berms where needed. • BMPs implemented at the site which will help to stabilize the site include seeding and mulching of areas that have been graded to final reclamation elevations. BMPs to prevent stormwater from contact with significant materials include the grading of the pit floor to direct runoff from the floor of the mining operation away from significant materials. In addition to these specific management practices used to reduce and minimize the potential for sediment discharge off-site, more general best management practices are used throughout the site such as erosion control fencing around sensitive areas, containment of aggregate stockpiles within recessed portions of the site, routine maintenance of equipment and employee training in the proper use and handling of equipment and materials handled on-site. The permittee will, on at least an annual basis, review the current EPA approved list of impaired waters and the TMDLs to determine if and to what extent the site's Pollution Prevention Plan must address these impairments and TMDLs. E. NON-STORM WATER DISCHARGES • There are no pit dewatering discharges or other non stormwater discharges from the site. F. MANAGEMENT AND RESPONSE Personnel responsible for managing the Storm Water Pollution Prevention Plan, implementation and reporting: Primary Contact: Josh Dresel Dresel Contracting, Inc. 24044 July Avenue Chisago City, MN 55013 Phone: 651.257.9469 G. INSPECTIONS The facility shall be inspected at least monthly during active operations to ensure that the Plan is followed and that Dresel Contracting is in • compliance with the requirements of their NPDES Stormwater Permit. A • written record of the inspections will be maintained by Dresel Contracting. Information required for the annual report/site inventory will be updated as needed. All of the inspection and maintenance information will be recorded in writing and the records will be retained with the Pollution Prevention Plan. Records of the inspection and maintenance activity will include: 1. Date and time of inspections 2. Name of person completing the inspection, 3. Findings of the inspection, (including recommendations for completing maintenance activities) 4. Corrective actions taken (including dates, times and party completing maintenance activities) 5. The date and amount of rainfall events greater than 'A inch in 24 hours obtained by actual measurement at the site or data from the nearest National Weather Service Station of local precipitation data found at http://www.crh.noaa.gov/mpx, 6. Documentation of any changes made to the Plan. H. FINAL STABILIZATION AND CLOSURE: Dresel Contracting, Inc. will be released from the inspection, recording • and reporting requirements of this permit for this site when they no longer conduct the activities authorized by this permit and certify on the Annual Report/ Site Inventory Form that: a. There is no stormwater runoff and/or pit dewatering from the site; or b. The Permittee certifies that a new owner or operator has assumed responsibility for the site; or c. The site closure achieves final stabilization. Site closure must achieve final stabilization as follows: a. The drainageways that leave the site are stabilized to prevent erosion with riprap or other protective material. b. The soil disturbing activities at the site are completed and all soils are stabilized by a uniform perennial vegetative cover with a density of 70 percent over the entire pervious surface area, or other equivalent means necessary to prevent soil failure under erosive conditions. c. The drainage ditches constructed to drain water from the site are stabilized to preclude erosion. • d. The temporary, synthetic, and structural erosion prevention and sediment BMPs (such as silt fence) are removed. e. The Permittee cleans out all sediment from conveyances and from temporary sedimentation basins that are to be used as permanent water quality management basins; sediment must be stabilized to prevent it from being washed back into the basin, conveyances or drainage-ways discharging off-site or to surface waters. The cleanout of permanent basins must be sufficient to return the basin to design capacity. f. The Permittee installs permanent stormwater treatment for new impervious surfaces created as a result of the activities covered by this permit. The permanent stormwater treatment must be designed for 0.5 inches of runoff from all created impervious surfaces. g. Other BMPs as necessary are implemented so as to prevent erosion from the site excavation areas and stockpiles that have been used by the Permittee. • • 1 1 Z 1 1 0_ 1 I I i f9-1. CI- 1 I 0 i c t t j II uj z 0 1 1 i 1 1 F- , I:t 1 F 1 (1) 2 1 1 z i 1 Q3 • N.,- i's ' 11 ;1 ,.. 5 1 1 1 1 1 i 1 11 g 1 a 1 ' Xig!lf li w r• 11 -- 2 1 1 I r ffi r z c,,T77 1 EX , g LT ,, ',-,E O; B 2• 81PI W' E g ' §A ' F 2 ' t'!1I1 / r ) to`ctIti r-tZ '9..,01.t.,0,0 ?, t- '03_ .02 =;-'=' '2 ._,,,...—.,—.) 4.....".. 1 • ow „-,-/ "---- — — •-4.1.5.- ..,-. , 1 ..„--- _ ct j i‘l _ \_ --- - ' 2 i ‘•i 000 -0 /• ' ( I Ito:i'llS-14 ;:g 1 = , AIP ' I_PF- ---------,,„ ,,,-,r- \ -- 91 i , i,P I ------ , 4;1' 1 7 fg 2'1'.F_Fill'i,, 11.! :, • rk, g :zs'' ' 0 %"••-•—•"14110.*'',..., ',, ( , (,)— 0 107P/40-,tt-kl)00,1 ;. ,4t4k1f4 °e 4, t',.,'„, •''',';',--,, ia," ''' ' gg" z .z ,,g2. 2 -.i° ' ..'• - ?s• . il Apr ^*,-,,Tiopkintr'''' .W1t1;1.14;lifsta) II'\I /, .7:11,".Atzt.tat:41111,1A10;:tVf 6''- / ' 'ilIIII,1li.:13:11011.1!W :',.' flTit:4?1; .i-S41' 2 mE ' N \ ' November 2007 Updated with Submittals through Mayl,2008 DRESEL CONTRACTING, INC. 11111 CONDITIONAL USE PERMIT APPLICATION FOR MINING AND PROCESSING CITY OF SCANDIA , . , 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 [}RESEL CONTRACTING, INC. SAND AND GRAVEL MINING OPERATION CITY OF SCAND|/\ WASH|NGT(]N COUNTY, M|NNESOTA |. INTRODUCTION The fOU0xYng permit GpDUc@tiOD is submitted OD behalf of DneS8| COD1n3CtiOg. Inc. (Dn8S8|) in compliance with the City DfSC8Ddia'8 Ordinance No. 103 and Chapter of the Development Code: Mining and Related Activities Regulations adopted by the City of Scendi@ on August 28. 2007. Or8se| 0pS[at8S @ gravel mining and processing Op8[@dOn within the City VfSCaDdi8. The site has been actively mined since the late 1900'a. Prior to the incorporation of SC@Ddia in 2006. New SC8ndi8 Township and Washington County were the permitting authorities. Permitted activities include the removal and processing of aggregate and the recycling of CDOCFetO and @SphG|L The operation is located on two parcels of property. The western parcel mnoonnpaSoms 40 acres, of which approximately 31 acres will be mined, and is owned by DreS8|. The eastern parcel encompasses 17 ocrma, of which approximately 5 acres will be mined. The eastern parcel is OvvOed by Roth and |98Sed by [)[ese|. The entire operation therefore is situated On 57 acree, cf which 3O acres iS included within the active mining limits. || SITE |mFC}FlMAT|[)N 1. Name and address Of Operator: Dnese| Cnntnocting. Inc. 24044 July Avenue Chis8gO Cib/, MN 55013 Name and @ddn88S Of land OvvD8r: P|D # 17.032,20.22.0002 Bruce A. Or8Se| c/o [)[eSelContracting, Inc. 24044 July Avenue ChiSogO City, MN 55013 P|D # 17.032.20.21.0003 Franklin and Marcella M. Roth 21820 Lofton Ave. OC8ndiG' MN 55073 • 2. An accurate legal description of where the mining shall occur: The legal description of the site is included as Attachment 1. 3. Names and addresses of adjacent property owners within 1/2 mile of the perimeter of the area being or to be mined: A list of all property owners within a 1/2 mile of the perimeter will be provided by the City of Scandia 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, 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 using front end loaders. Processing consists of crushing, screening, and stockpiling. Recycling of concrete and asphalt occurs at the site and also consists of crushing, screening and stockpiling. The final product is loaded on trucks using front end loaders and the product is delivered to projects throughout the area An estimated 750,000 - 1,000,000 cubic yards (cy) of aggregate reserves remain at the site. Annual production is quite variable. The material is used to supply local projects. Based on previous site activity, annual production at the site varies from 0-100,000 cy. The life of the facility is completely dependent upon future market demand. Blasting does not occur at this site. 5. Fee: The required application fee has been submitted to the City under separate cover. 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: The Site Plan, C2, 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. The main access route to and from the site is Lofton Avenue, (County Road 1) to 218th Street North. The site entrance is located about 800 feet west of Lofton. Lofton and 218th are paved. The names, right-of-way widths, and traveled portion width of all adjacent roads are illustrated on the Existing Conditions Plan, Cl. B. Easements Plan with widths and purpose. • Easements, with widths and purpose are illustrated on the Existing Conditions Plan, Cl. 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 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. There are no manmade structures or water impoundments on the site. F. 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 % mile of the property boundaries. Wells should include private/agriculture, industrial, municipal wells within 1/2 mile radius of the mine. S Adjacent land features, platted subdivision lots, metes and bounds parcels, and homes within % mile of the property are indicated on the Existing Conditions Plan, Cl. All wells within 1/2 mile radius of the facility, which are on file at the Minnesota Department of Health's County Well Index, are indicated on Figure 2. 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 two north-south and two east-west cross sections are included as Sheets C5-C6. 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. Soil boring data was used to develop the site cross-sections. H. All processing areas and boundaries shown to scale. Processing areas are identified on the Site Plan, C2 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 the Site Plan, C2. J. Sequences or phases of operation showing approximate areas involved shown to scale and serially numbered with a description of each. There are essentially four main phases of mining remaining at the site. Two of the remaining phases may be mined concurrently. The sequence of operations showing the approximate areas involved and the various phases of the operation are indicated on the Phasing Plan, C4. 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 the Site Plan, C2. L. Fences and gates and their type or construction described and illustrated: Fences and gates are indicated on the Site Plan, C2. Three strand wire fence surrounds the site. Locking metal gates are located at the site entrance. M. Proposed location of principal service or processing buildings or enclosures as well as locations of settling basins and process water ponds: • There are no buildings or structures on the site. Stormwater collects at low areas within the pit floor and infiltrates. 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 water management plans. The SWPPP 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, wetland buffers and dust control. Screening berms around the perimeter of mining area are vegetated to reduce erosion and to help contain fugitive dust. Stormwater contacting exposed areas drains internally. A vegetative buffer strip is preserved around the wetland basin located west of the active mining area. The buffer strip filters runoff and reduces the potential for sedimentation to occur within the wetland basin. 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 Reclamation Plan, 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. 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. Reclaimed areas will be planted with a mix of native trees, shrubs, grasses, flowers and groundcover. O. A plan for groundwater quality protection to include a minimum of three soil borings showing depth to groundwater. Three soil borings were drilled in conjunction with past permitting work. The locations of the soil borings are indicated on the site plan, 02. The soil borings identified the water table at an average elevation of 919 feet above mean sea level beneath the site. The mining operation is located in an area characterized by the prevalence of very granular, permeable and non-reactive soils with very low filtering 41111 capacity typical of sand and gravel deposits. If contaminants are introduced into the soil column, groundwater may be impacted within a very short time frame. There 111 are a number of site BMPs and technologies available that are discussed below which eliminate or reduce the potential of introduction of contaminant sources into the soils. Groundwater Protection Plan • 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 and have secondary containment. • Topping off of tanks during refueling of any kind is not allowed. • Availability of spill cleanup equipment on-site including equipment to excavate and remove impacted soils in an expedited fashion. 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 will be conducted on an annual basis at the site. Currently there are no monitoring wells on the site. One monitoring well will be drilled on the north end of the property and will function as a down gradient well. This well may also serve as Tiller Corporation's upgradient well. The well will be monitored for Diesel Range Organics (DRO) on an annual basis. Monitoring results will be submitted to the City of Scandia. 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. 411/ There is no lighting proposed at the site. R. Reclamation Plan in conformance with Section 8. The Mining and Reclamation Plan, Sheet C3 is a graphic representation of reclamation a[t|V|VeS. * Intent: The intent of reclamation activities covered in this section is to restore the site to a stable coOditiOn, nOiDiOliZ8 the potential for erosion and allow for future development Of the land. * Methods and processes Of r8C|Gnl8UOD: Reclamation will involve slope stabilization, Seeding and mulching. Slope stabilization will be accomplished by bGCkfiUiOg and grading the side 8lOD8S to a DO@XiDlU[n Of4:1. A Dl/niOlUrn of four inches of loamy SOi|O. suitable as tOpSni|, will be placed on the graded slopes. After topsoil has been placed, the slopes will be S88dRd and rnu|ChBd to establish vegetation. w |DiU8| COndiUOD of mining site: The site has been G mining operation for many years. * Limits of various 0peroUOn8| areas: The Open8UOn@| areas are indicated on the Site Plan, Sheet C2. w Phasing and dnnin0 of operations and reclamation including areas to be stripped of overburden. Phasing of mining operations is included on the Phasing P/an, Sheet C4. Phase 1`4will be mined in conjunction with Tiller Corporation to a000rnrnOdoto the [enlnv@| of the cVDnnl0O mining border. Phase 1-E3 may he mined concurrently with 1-A Some Fedarn8hOO activity has been completed. These 2ra8S are illustrated VO the Site P|an, Sheet 2. R8C|8nlaUon of8ideS|Opes will continue as mining pnJgnBsGaS 8rpUDd the perimeter of the excavation limits, w Final condition of the Site, including proposed contours and landscaping: The Mining and R8d@rnabon pz|8n. Sheet C3, indicates proposed site a|evodODS upon oonlp|eUOn of restoration. * Relation of final site condition to adjoining |oOd h3rrnS and drainage features within 1/4 mile. Reclamation of the site will result in open space with wooded areas and an isolated vv8t|@Od basin in the western portion of the site. * Relation of reclaimed site to planned or established USCS of surrounding land: The land is designated general rural/agriculture with 4/40 densities. Surrounding land use is similarly guided, Established land V38S are agricultural and rural residential in nature. ° A plan for maintenance Of reclaimed area: See Mining and Reclamation P|an, Sheet C4. * A detailed C0St 8Sdrnete of reclamation and maintenance: RCdarD8dOn costs for the area cV[[8DtlV opened to mining (essentially entire site) are outlined h8lVVV: Finish grading of disturbed area; 36 acres: 36 acres at $1.000/8Cre $36.000 0 • Placement of 4" topsoil from on-site stockpiles; 36 acres: 19,360 cy at $ 1.00/cy $19,360 Seeding and Mulching 36 acres at $600/acre $21,600 Total reclamation costs; $76,960 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. Aggregate is excavated using front end loaders. Processing at the site generally includes crushing, screening, and stockpiling of aggregate, and the recycling of concrete and asphalt by crushing, screening and stockpiling. 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. Reclamation activity may occur within 50' of the road right-of-way. As indicated in the plan set, the setback along the common mining boundary to the north is 0'. 2. Fencing: The entire site is fenced with 3 strand wire fencing except where prohibited due to topography, woods and wetlands. There is a locking metal gate at the entrances to the site. • 3. Hours of operation: The site is operated from 7:00 a.m. to 7:00 p.m. Monday through Friday except • holidays. Extended hours may be required periodically for situations such as emergencies, accelerated work schedules or weather delays. 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. There is buffer area to the west and a screening berm along 218th Street N. Processing and stockpiling operations are conducted in recessed portions of the site to minimize visibility. The location of the screening berm is indicated on the Site Plan, Sheet C2. 5. Dust control: Dust is generated by crushing and screening equipment, excavation and loading equipment, and vehicular movement. Processing areas are located at elevations lower than the surrounding terrain in order to minimize windborne dust leaving the site. Screening berms and perimeter vegetation also minimize dust from leaving the site. 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: Excavation is conducted to a maximum depth of approximately 920 feet above mean sea level. Some backfilling may be required to obtain final restoration grades. 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 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: • Portable sanitary facilities are provided in the operating area. 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: There is no permanent fuel storage on site. When portable processing equipment is brought to the site, a fuel truck is used to fuel the equipment as needed. There is no chemical storage on-site. 14. Contingency Response Plan: In the event of a fuel leak or spill, immediate action will be taken. If the spill or leak is active, measures will be taken to control or stop the spill. Available on-site equipment (loaders, dozers) will be used to contain and recover the spill. Additional cleanup 11) equipment and personnel will be called in for assistance as necessary. A spill that consists of five gallons or more requires that the MPCA State Duty Officer be immediately notified at 651 649-5451. Cleanup will occur in cooperation with the Minnesota Pollution Control Agency. 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. 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 varies from 0-50,000 cy of asphalt and concrete combined. The stockpile of material to • be recycled will not exceed the volume of material that can be processed in two • consecutive mining seasons. 18. Trucking Operations: The site has access to 218th Street North about 800 feet west of County Road 1 (Lofton Avenue). Lofton and 218th are paved. 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: There are no hot-mix asphalt or ready-mix plants operated at this facility. 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 • • 4110 ATTACHMENT 1 LEGAL DESCRIPTION (From Tax Statements) Dresel Property: PID 1703220220002 Sect-17 Twp-032 Range-020 PT N1/2-NW1/4 S17T32R20 BEING THE E 1396FT OF THE FOLL DESC PARCEL:THAT PT N1/2-NW1/4 OF S17T32R 20 LYING NLY OF THE S 66FT &LYING WLY OF THE E 768.7FT THEREOF NEW SCANDIA TWP Roth Property: PID 1703220210003. Sect-17 Twp-032 Range-020 PT NE1/4-NW1/4 173220 COM AT N1/4 COR OF SEC 17 THEN S ALONG N & S 1/4 LINE OF SD SEC A DIST OF 527.5 FT TO PT OF BEG THEN CONT ON SAME LINE A DIST OF 443.5 FT TO A PT THEN ON A DEFLECT ANG TO RT OF 90DEG. A DIST OF 491 FT TO A PT THEN ON A DEFLECT ANG TO RT OF 90DEG. A DIST OF 443.5 FT TO A PT THEN ON A DEFLECT ANG OF 90DEG. TO RT A DIST OF 491 FT TO PT OF BEG SUBJ TO EASEMENT AND THAT PT NE1/4 NW1/4 S17T32R20 DESC AS FOLL:COM AT THE N1/4 CORNER OF SEC17 THN SLY ALG THE N-S1/4 LINE OF SEC17 A DIST 971FT TO THE PT OF BEG THN WLY DEFLECT 90DEG TO THE RT A DIST OF 491 FT THN NLY DEFLECT 90 DEG TO THE RT A DIST 443.5FT THN ELY DEFLECT 90DEG TO THE RT A DIST OF 76 FT THN NLY DEFLECT 90DEG TO THE LEFT A DIST 548FT M/L TO THE N LINE OF SEC17 THN WLY ALG THE N LINE OF SEC 17 A DIST 355FT M/L TO THE W LINE OF THE E 768.7FT OF SD NE1/4 NW1/4 THNC SLY ALG SD W LINE A DIST 1254FT M/L TO THE N LINE OF THE S 66FT OF SD1/4 -1/4 THN ELY ALG SD N LINE A DIST OF 770FT M/L TO THE N-S1/4 LINE OF SEC 17 THN NLY ALG SD N-S1/4 LINE A DIST OF 283FT M/L TO THE PT OF BEG -SUBJ TO CSAH#1 ALG THE MOST ELY LINE SUBJ TO & INCLUDING ANY VALID EASEMENTS RESTRICTIONS & RESERVATIONS NEW SCANDIA TWP (RESTRICTION:WRITTEN APPROVAL FROM NEW SCANDIA TWP IS REQUIRED BEFORE EITHER OF THE TWO(2)PARCELS OF LAND DESCRIBED HEREIN MAY BE CONVEYED SEPARATELY 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 WASH I NG TON COUNTY GENERAL LOCATION MAP FIGURE I .N. %—k-,.., - s,„04. c 1 ¢�f d ay z p t. �� it ; v r q t t ,F,3 , 94` q i 4 d 6 �{{va ��pyyq M ' '• t" s y 4.. 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P _... /ce ; a to, 1 - ! a a / a a I OS6 0 -—- — ——— - ------,, 7 ' ---- crov e'r ) I r ( __\,_ !�� iF �� 0 Il ' hi / I ( ' -\ ti 2 ll..i. 3 ., / ir 1p EMMONS ma, & OLIVIER • l'-.- RESOURCES r-:-------_----------,... , - MEMORANDUM Date: March 31, 2008 To: CMSCWD Board of Managers From: Lisa Tilman, P.E. and Dan Fabian, P.E. Re: Summary of Review and Recommendations for Permit App. No. 08-004 Dresel Contracting Mining Operation, Scandia RECOMMENDATIONS We recommend Managers authorize Administrator to approve and issue permit contingent on Applicant addressing following comments (Primary issues are items 3 and 4), to satisfaction of District Engineer: Summary of comments to be addressed prior to permit issuance: 1. For the required review fees a deposit of$2,000.00 has been received. Applicant is responsible for replenishing this deposit if it appears it will be insufficient to cover District III review costs. The estimated completion date for this project is 2025 +/-. 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 conditions site calls for excavated within 3-feet of the groundwater table. As far as we know this was not previously permitted for this site. Excavation into the groundwater is not allowed per current District requirements. Revise proposed conditions mining plan to raise pit bottom elevations to at least 3-ft above the groundwater elevation (currently identified at 919.0-ft). This area of the proposed final grade of the pit appears to be an extension of the adjacent the Tiller Corp. proposed groundwater lake. The Managers will need to provide direction to staff on how to best handle this issue. The Tiller Corp. Permit submittal is currently incomplete and review is on hold until application is • Page 2 3/31108 Dresel Contracting Mining Operation Review 1111 completed. Assuming the Tiller Corp. Permit is eventually approved, and that the EAW prepared for that project included the work in the Dresel Pit, and then a permit revision for mining into the groundwater could be requested at that time. 4. The proposed total discharge volume offsite for the 2-year and 10-yr events exceed the total pre-settlement discharge volume offsite. The additional discharge is to the north and is directed to a large groundwater "lake"to be constructed with the reclaimed site condition on the Tiller Corporation property. The increase in runoff volume offsite also likely indicates an increase in phosphorus load offsite. The increased offsite drainage will be directed to a basin to be constructed with the reclaimed site condition on the Tiller Corporation property. Provide written, legal documentation from the landowner of the Tiller Corporation property that use of the property for stormwater management in the reclaimed condition is allowed. 5. The submitted information does not allow a clear evaluation of the potential to drain the two wetlands located adjacent to active and proposed mining operations. Provide field delineation and report for the two wetlands adjacent to the pit. The westerly wetland is identified as a Category 2 wetland under current district requirements and has a 50-ft buffer requirement. Maintain an undisturbed buffer area of at least 50-ft for both of these wetlands until wetlands are delineated and potential impacts and requirements arc determined. (Note: the delineation requirement can be included as a permit stipulation to be completed this • spring). 6. 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. 7. Include measures to avoid tracking of sediment offsite through vehicle traffic. GENERAL COMMENTS AND BACKGROUND INFORMATION The Dresel Contracting Mining Operation is located east of Lofton Avenue and north of 2 le Street in the City of Scandia, MN (see Figure 1 for location map). The proposed project entails the continuation of gravel mining and processing activities on a 57 acre lot. The project includes crushing and washing of gravel and recycling of concrete and asphalt, but does not include an asphalt plant or pit dewatering. The project will disturb a total of 35.5 acres through mining to an elevation of 918 ft.; 31 acres of the site have been disturbed through past mining operations. The groundwater elevation is estimated to be about 919 ft. based on soil borings taken in the past (to date, soil boring information has not submitted to the District). Proposed plans call for excavation within 3-feet the groundwater which is contrary to the requirements of current District rules. The site does not drain directly to an identified groundwater-dependent natural resource; however the adjacent Tiller Corp. Mining Operation will be creating a groundwater lake. Future proposed development of area after mining operation is complete will need to take • that into account. • • of 3 Review Page of 3/3//08 Mining Operation activities through following completion meet the Dresel Contracting of site . need to of planned mining development an,, will completion isfor further proposed submittal " * application. . te Any permit application submittal, comments Permit for entire si • . a new the time of ' d review by require vegetation . ities will req applicable at • initially provided receivedAll complete restoration mining activities • trict(District) completeness of information 25, 2008. were requirements District the ,ated January. district permi • Watershed to • • St. Croix pertained our letter .a ._, for this project, ,r, March i u, • Marine that primarily in Permit Application I received on . 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