5.4. SR 09-07-2004 - Laserfiche WebLink

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158B Zimmerman fine sand 3 to 6% slopes 158E Zimmerman fine sand 12 to 25% slopes 161 Isanti fine sandy loam, depressional, 0 to % slopes 540 Seelyeville muck 0 to 1% slopes 730B Sanburn fine sandy loam 2 to 6% slopes 1109 Isanti loamy fine sand 0 to 2% slopes 1253B Stonelake-Sanburn Complex 1 to 6% slopes 1253C Stonelake-Sanburn Complex 6 to 15% slopes 1253E Stonelake-Sanburn Complex 15 to 40% slopes The majority of the Site is covered by the Seelyeville muck and the Sanbum fine sandy loam. The Sanbum Complex consists primarily of gravelly sand and sandy loam with moderately rapid to very rapid permeability. This is the primary unit where mining for gravel will occur. The Seelyeville muck is primarily decomposed organic material and peat deposits with moderately rapid permeability. The permeability of the granular sand and gravel deposits is greater than that of silty or clayey soils. Potential vertical migration of impacts from spills or releases is greater for soils with higher permeability. Mitigative measures to prevent and/or control contaminant releases include use of best management practices and compliance with local, state and federal regulations. Such regulations include NPDES permits and development of a Storm Water Pollution Prevention Plan (SWPPP) and a Spill Prevention Control and Countermeasures Plan (SPCC). Such plans provide for control and spill response associated with releases. General practices should include proper use and routine maintenance of equipment, performance of maintenance activities in designated areas or on designated surfaces with appropriate spill containment measures at hand and, secondary containment as appropriate. Controlled access to excavation and operating areas should also be maintained to provide against such things as vandalism or illegal dumping. The plans also contain provisions for mining activities and spill response in the proximity of open water areas which are proposed at the site. A ground water monitoring plan has also been developed for the site to address monitoring of the ground water elevations during mining activities and annual sampling for ground water quality. Ground water quality monitoring will be conducted for parameters including Diesel Range Organics (DRO), Gasoline Range Organics (GRO) and Petroleum Volatile Organic Compounds (PVOC's). The ground water monitoring plan addresses contingency action plans to ground water impacts for the above mentioned parameters as well as for a significant decrease in the ground water elevations should they occur during and as a result of mining activities. The City of Elk River would be notified immediately of the necessity to proceed with contingency actions at the site. 20. Solid wastes, hazardous wastes, storage tanks a. Describe types, amounts and compositions of solid or hazardous wastes, including solid animal manure, sludge and ash, produced during construction and operation. 15