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Crpood wtter contamination is restricted to the area of the recovery trench (Appendix F). Contaminant <br />li^COOCenirttions are the greatest in monitoring wells MW-2, MW-2D, and MW-4D. <br />S O RECOMMENDATIONS <br />1*1 > and Treatment <br />Wf recommend continuation of the existing recovery program already initiated at the site. The system is <br />; crcatiog a cone of influence sufficient to control the gradient within the contaminated zone and to draw <br />the contaminated ground water toward the recovery well. <br />' <br />^'lafluenl contaminant concentrations are very low and if this trend continues we will propose direct <br />discharge to the sanitary sewer system during the spring. Concentrations are well within the acceptable <br />raage permitted by the MWCC. <br />S.7 Soil Treatment and Monitoring <br />' As proposed in our RAP concerning the WSI facility, ail stockpiled contaminated soil will be thinspread <br />across the designated area shown in Figure 12. The soil contamination is minimal ranging from below <br />detection levels to 0.086 mg/1. The MPCA concurred with cur spreading treatment method proposed in <br />the original RAP. <br />'Approximately 800 cubic yards of contaminated soil will be spread over the area shown in Figure 12. <br />V The soil will be placed over the existing grassy surface in a single layer three to six inches thick. Silt <br />edutainment fencing will be placed around the thinspread area to control runoff water. Given the very <br />contaminant concentration of the soil, we foresee no potential impacts to nearby surface water from <br />or to the local air quality (Appendix D). <br />viTn® nearest building to the spread area is WSI facility which is approximately 200 feet north. Other <br />in the area are situated more than 2,000 feet from the soil treatment area.