Laserfiche WebLink
i <br /> Harry's'Auto Mart .- 3 - .._August 11, 2011 <br /> Remediation Summary <br /> • Free Product: No free product was documented throughout the life of this case. -y <br /> • Soil Excavation: An unknown volume of impacted soil was removed and disposed <br /> offsite in 1989 <br /> • In-Situ Soil/ Groundwater Remediation: Soil vapor extraction and air sparging 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 varies seasonally between 34 to 43 feet bgs and <br /> the groundwater gradient is south at 0.002 feet/foot (April 2011). , <br /> • Estimate of Hydrocarbon Mass in Soil: Prior to remediation, Advanced <br /> Geoenvironmental estimated that approximately 24,300 pounds of TPH-G remains in <br /> site soils. <br /> • Groundwater Trends: There are more than ten years of groundwater monitoring data for <br /> this Site. Benzene trends are shown below, source a(ea (MW=1)-and down gradient-- <br /> (MW-2). V <br /> BENZENE Results for MW1 <br /> 35000., <br /> 30000 <br /> t <br /> .. r <br /> 120-01- <br /> 215000 1 <br /> 5_000 <br /> 01 <br />-� I -- -- - <br /> BENZENE --- Trentl <br /> 1 <br /> BENZENE Results for MW2 <br /> 3000, <br /> I <br /> - <br /> 25004 .. ... <br /> � l <br /> 2000 <br /> �. <br /> XS1500t i <br /> X10001 <br /> I <br /> 500+ <br /> �•..-BENZENE +++Trend l - <br /> t <br /> Risk Evaluation <br /> No human health risk assessment noted in Geotracker. There are ten water supply wells or <br /> surface water receptors present within 2,000 feet of the Site. <br /> Recommendation <br /> In May 2008, the Fund made the following recommendation, that the„San Joaquin County LOP <br /> should direct the Responsible Party to assess remedial technologies and implement active <br /> remediation to achieve Water Quality Objectives in a timely manner. The Fund will review this <br /> site next year to track progress. <br /> i <br />