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RMB Garage . 3 - August 30 , 2011 <br /> Site History/Assessments <br /> In May 2001 , soil contamination was identified during the removal of USTs . To date, 15 <br /> monitoring wells have been installed and monitored regularly. A Site map showing the location <br /> of the former USTs , monitoring wells and groundwater level contours is provided at the end of <br /> this five year summary. <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 2001 <br /> • In-Situ Soil/ Groundwater Remediation : Dual phase extraction , conducted from <br /> September 2008 through present removed approximately 35 , 158 pounds of TPHg and <br /> 2 , 659 ,460 gallons of groundwater. In 2nd Quarter 2011 , the rate of removal was between <br /> 18 to 27 pounds. of TPHg/day. <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 24 feet bgs and the <br /> groundwater gradient is northeast at approximately 0. 005 feet/foot. <br /> • Groundwater Trends: There are more than 8 years of groundwater monitoring data for <br /> this Site . Benzene trends are shown below, source area (MW-3) and down gradient <br /> (MW-5) <br /> BENZENE Results for MW3 <br /> � seeded <br /> � <br /> is <br /> � <br /> BEVJ�NE Trend <br /> BENZENE Results for MW5 <br /> asses <br /> CO <br /> 26000 <br /> 20sw <br /> sod . <br /> I <br /> `" o-t <br /> REe E - Trend <br /> Risk Evaluation <br /> No human health risk assessment is noted in Geotracker. There are no water supply wells or <br /> surface water receptors present within 2 , 000 feet of the Site. <br /> Recommendation <br /> May 2008 , the Fund recommends that the San Joaquin County LOP direct the Responsible <br /> Party to assess remedial technologies and implement active remediation to achieve Water <br />