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Cherokee Truck Sto ' -:3 - August 25, 2011 <br /> p <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 <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 I ., <br /> • Groundwater Remediation: Ozone sparging bench scale pilot test <br /> General Site Conditions <br /> • 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) <br /> 6ICHLOROETHANE Results for MW5 <br /> Sao- <br /> , <br /> 400.,. t .. ;r <br /> I Ir <br /> .^350... .;._I. <br /> 300• I ...w i <br /> �5 260 <br /> . <br /> 00 <br /> r o <br /> n <br /> I-­1 2-DICHLOROETHANE �_T ntl <br /> 1,2-DICHLOROETHANE Results for MW6 <br /> 10�--- -- ._.._ ��. �._....,.., <br /> i <br /> I <br /> o� <br /> �' <br /> LO--ETHANE <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 /> I <br /> i <br />