4.1. DRAFT MINUTES 02-18-2014 - Laserfiche WebLink

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City Council Minutes Page 7 January 21,2014 3. The following conditions shall be addressed to the satisfaction of the city's environmental consultant: a) The anticipated groundwater elevation at the site is anticipated to range from 954 on the east and 951 on the west. The applicant shall provide complete references for available groundwater elevations. The applicant must also address the use of the historic high groundwater levels in establishing the excavation base grades. The "Excavation Plan," C2 must be modified to reflect these anticipated groundwater elevations. b)The plan of operation does not identify where the phasing of mining (and reclamation) will occur and the timing for each phase. The site must be excavated in an orderly fashion to reduce the area of open mining at any one time. In particular, it is recommended that the northern portion of the site be reclaimed prior to initiation of mining in the new parcel proposed for the expansion. The future location of the main operations area and office, now located in the southeast corner of the northern parcel, must be identified on the (phasing) Excavation Plan, C2. The Excavation Plan must also show the locations of topsoil and backfill soils which will be used in reclamation. The soil volumes of the anticipated phases must be indicated in the application and on the Excavation Plan. This information shall be submitted by March 1, 2014. c) The details for screening berms on the north side of 221" Street must be provided. The suitability of the berms for site screening must 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. d) Sand and gravel mining at the groundwater table increases the vulnerability of groundwater resources at the site to contamination from chemicals and petroleum products. The Groundwater Protection Plan provided in the application discusses the use of oils and asphalt cement. This must 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 must be indicated on the Excavation Plan. e) The applicant must identify contingency procedures for mechanical sweeping in the event that sediment removal on public roadways is deemed appropriate by the City of Elk River. f) 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 W 0E0 0 'P