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d) Sand and gravel mining at the groundwater table increases the vulnerability of <br /> groundwater resources at the Site to contamination from chemicals and petroleum <br /> products. The Groundwater Protection Plan provided in the application discusses <br /> the use of oils and asphalt cement. This must be expanded to address the potential <br /> presence of all types of hazardous substances and petroleum products and present an <br /> inventory of these chemicals and petroleum products relative to the groundwater <br /> resources at the Site. Protective measures must address the location of fueling <br /> operations of Site equipment and all types of transfers related to petroleum and <br /> chemicals. The location(s) of spill containment equipment must be indicated on the <br /> Excavation Plan. <br /> e) The applicant must identify contingency procedures for mechanical sweeping in the <br /> event that sediment removal on public roadways is deemed appropriate by the City <br /> of Elk River. <br /> f) The applicant must provide a more detailed plan which identifies the placement of <br /> control measures for water runoff and sediment erosion for all areas which do not <br /> drain to the interior settling ponds. This must include description of control <br /> measures and locations where they are placed. Appropriate control measures are <br /> temporary vegetative seeding, mulch, buffer zones, earthen dikes, drainage swales, <br /> sediment traps,riprap, sediment basins and silt fencing. <br /> g) The requirement for Topsoil Preservation (Sec. 42-96) is not addressed. The Plan of <br /> Operation must identify the volumes of soils required for reclamation and the future <br /> locations of soil stockpiles. <br /> h) Final slopes on the northern portion of the Site and the west property boundary of <br /> the southern parcel for McCrossan are indicated as 3:1 slopes,which exceed the <br /> required maximum of 4:1. This may be acceptable, however the thickness of topsoil <br /> will need to be increased and provisions for drainage/erosion control need to be <br /> addressed. Erosion control measures for slope areas where surface water runoff is <br /> concentrated must be identified. <br /> i) The reclamation plans requires the backfilling of soil from the mining grade to the <br /> final contours. An earthwork balance assessment of soil volumes for reclamation <br /> must be provided by the applicant to insure that sufficient volumes of soil are <br /> maintained onsite to meet the reclamation earthwork needs. <br /> j) The Reclamation Plan indicates future potential roadways. The north-south frontage <br /> road in the southern portion of the Site indicates a grade as steep as 20%. The plan <br /> must be modified to accommodate a typical roadway grade. <br /> k) The Reclamation Plan must indicate the locations and plantings for the revegetation <br /> of the mined areas. <br /> 1) Mining which occurs in the vicinity of the wetland will decrease the drainage area for <br /> the wetland, as proposed. There is a potential that the hydraulic characteristics of <br /> the wetland will be changed resulting in a change in the related biological <br /> N:\Departments\Community Development\Planning\Case Files\CUP\CU 14-03 Tiller Corp\CU 14-03 sr'riller 1-14-14.doca <br />