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Mabel E. Keir • - 3 - August 11, 2011 <br /> Remediation Summary <br /> • Free Product: No free product was documented throughout the life of this case. <br /> • Soil Excavation: An unknown volume of impacted soil was removed and disposed <br /> offsite in 1987 <br /> • In-Situ Soil/ Groundwater Remediation: Soil vapor extraction and a ozone sparging <br /> bench scale test approved by the San Joaquin County LOP <br /> General Site Conditions <br /> • Geology and Hy rogeology: The Site is underlain by interbedded and intermixed sand, <br /> silt and clay. Th depth to groundwater varies seasonally between 15 to 19 feet bgs and <br /> the groundwater gradient is southeast at approximately 0.002 feet/foot. <br /> • Estimate of Hydrocarbon Mass in Soil: Prior to remediation, by report in 2011 Advanced <br /> Geoenvironmental estimated that approximately 1,836 pounds of TPH-G remains in site <br /> soil and 71,pounds dissolved in groundwater. <br /> • Groundwater Trends: There are more than six years of groundwater monitoring data for <br /> this Site. Benzene trends are shown below, source area shallow (MW-1), source area <br /> deep (MW-10) and down gradient (MW-5) <br /> BENZENE Results for MW1 <br /> rE000 <br /> u00o <br /> 120ao <br /> :0W <br /> 20M, <br /> i <br /> 1-41 <br /> of <br /> a <br /> -a.BE ZENE Troll <br /> BENZENE Results for MW10 <br /> moo <br /> 1500 <br /> 500 <br /> BENZENE ---TnnC <br /> BENZENE Results for MWS <br /> 35 <br /> o <br /> 5 <br /> ---------------- <br /> rc <br /> Tnn <br />