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tw; Equilon Enterprises - 3 -. August 29, 201,1 <br /> Site History/Assessments I, w <br /> In December 1994, soil contamination was identified during the removal of USTs. To date <br /> 17 monitoring wells have been installed and monitored regularly. A Site map showing the <br /> location of the current USTs, monitoring wells and groundwater level contours is provided at the <br /> end of this five year summary. <br /> Remediation Summary f <br /> Free Product: No free product was documented throughout the life of this case. <br /> • Soil Excavation: Unknown <br /> l • In-Situ Soil Remediation: 'No soil remediation has been conducted - <br /> • Groundwater Remediation: Groundwater extraction, conducted from September 2005 <br /> II( through November 2009 removed approximately 18.5 pounds of TBA and 161,514 <br /> gallons of groundwater. <br /> General Site Conditions y <br /> • Geologyand H dro eolo" : The Site is underlain b interbedded and intermixed sand, <br /> Y 9 9Y Y , <br /> silt and clay. The depth to groundwater varies seasonally between 52 to 58 feet bgs and , <br /> the groundwater gradient is north at approximately 0.02 feet/foot. ` <br /> Groundwater Trends: There are more than 11 years of groundwater monitoring data for <br /> this Site. TBA trends are shown below, source area (MW-4) and down gradient (MW-1) <br /> ., TERT-BUTYL ALCOHOL(TBA)Results for MW> I, ' <br /> 7w0 J <br /> t <br /> Ile <br /> 1 , <br /> ftTB ... <br /> TnM v <br /> TERT-BUTYL ALCOHOL(TBA)Results for MWA - - <br /> N <br /> _._ .. <br /> '. <br /> ama <br /> Risk Evaluation <br /> There are no water supply,wells I,r surface water receptors present within 2,000,feet of the Site. <br /> t <br /> r <br />