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Cherokee Truck Stop August 25, 2011 <br /> k <br /> Site History/Assessments <br /> In August 1988,USTs failed a tank tightness test. To date, 11 active monitoring wells have <br /> been installed and monitored regularly. A Site map showing the location of the current USTs, <br /> monitoring wells and groundwater level contours is provided at'.the end of this five year r <br /> summary. <br /> Remediation Summary <br /> • Free Product: No free product was documented throughout the life of this case, <br /> • Soil Excavation: Unknown . <br /> • In-Situ Soil Remediation: Soil vapor extraction pilot test, conducted in 2008, removed <br /> 40 pounds of TPHg in 8 hours. A second soil vapor extraction pilot test was conducted <br /> for 90 hours in February 2011 and removed 410 pounds of TPHg <br /> Groundwater Remediation: Ozone sparging bench scale pilot test <br /> General Site Conditions <br /> e Geology and Hydrogeology: The Site is underlain by interbedded and intermixed sand, <br /> silt and clay. The depth to groundwater is approximately 60 feet bgs and the <br /> groundwater gradient is northeast at approximately 0.001 feet/foot. - <br /> • Groundwater Trends: There are more than 10 years of groundwater,monitoring data for <br /> this Site. 1,2 DCA trends are shown below, source area (MW-5) and down gradient <br /> (MW-6) . 'k <br /> 1,2-DICHLOROETHANE Results for MW5 i <br /> soo <br /> 450 t... `, r_ •ti <br /> 400 <br /> 350. <br /> (3300 .. ...- <br /> 250 <br /> . 100�. � .. <br /> 50 <br /> .. 0. <br /> .' u.!..-. 1,2-0ICHLOROETHANE ---Tre d <br /> 1,2-DICHLOROETHANE Results forMW6 <br /> 12_ <br /> t <br /> 6 7 <br /> /_2-D15HLOROETHANE----TrerM <br /> Risk Evaluation <br /> No'human health risk assessment is noted in Geotracker. The nearest water supply well is 261 <br /> feet up-gradient (west) of the Site. <br /> I <br />