7.3. SR 01-21-2014 - Laserfiche WebLink

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Mr.Chris Leeseberg December 17,2013 Page 3 of 4 locations of topsoil and backfill soils which will be used in reclamation. The soil volumes of the anticipated phases should be indicated in the application and on the Excavation Plan. Screening berms are indicated on the Excavation Plan. During the Site visit,Mr.Caron indicated that the screening plan was not completely detailed on the Excavation Plan,C-2. The details for screening berms on the north side of 221st Street should be provided. The suitability of the berms for site screening should be further demonstrated by the applicant. Details have not been provided on security fencing for the new parcel in the southern portion of the Site. Sand and gravel mining at the groundwater table increases the vulnerability of groundwater resources at the Site to contamination from chendcals and petroleum products. The Groundwater Protection Plan provided in the application discusses the use of oils and asphalt cement. This should be expanded to address the potential presence of all types of hazardous substances and _petroleum products and present an inventory of these chemicals and petroleum products relative to the groundwater resources at the Site. Protective measures must address the location of fueling operations of Site equipment and all types of transfers related to petroleum and chemicals. The location(s)of spill containment equipment should be indicated on the Excavation Plan. (9)Plans for drainage,wind and water erosion control,sedimentation and dust control, maintenance of security on the proposed extraction site,control of access to open extraction and control of weeds and unsightly vegetation. The information is provided on page 7 of the application. The applicant should identify contingency procedures for mechanical sweeping in the event that sediment removal on public roadways is deemed appropriate by the City of Elk River. The applicant must provide a more detailed plan which identifies the placement of control measures for water runoff and sediment erosion for all areas which do not drain to the interior settling ponds. This must include description of control measures and locations where they are placed. Appropriate control measures are temporary vegetative seeding,mulch,buffer zones, earthen dikes,drainage swales,sediment traps,riprap,sediment basins and silt fencing. (10)A comprehensive rehabilitation plan showing suitable provisions for rehabilitation of the excavated area to a useable condition compatible with the adjacent land such that it will not become a health or safety hazard or a nuisance. Such plan shall, at a minimum,include anticipated final elevations,slopes and plans for the return of vegetation, subsoil and topsoil. Where the council deems practical and necessary,such plan shall also include adjoining related areas where extractions have previously been made which remain under the control of the applicant or the owner of the land on which the extraction is proposed. The information is provided on pages 7 and 8,and the Reclamation Plan,C3 of the application. The requirement for Topsoil Preservation(Sec.42-96)is not addressed. The Plan of Operation must identify the volumes of soils required for reclamation and the future locations of soil stockpiles. Final slopes on the northern portion of the Site and the west property boundary of the southern parcel for McCrossan are indicated as 3:1 slopes,which exceed the required maximum of 4:1. This may be acceptable,however the thickness of topsoil will need to be increased and provisions for drainage/erosion control need to be addressed. Erosion control measures for slope areas where surface water runoff is concentrated must be identified.