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January 30, 2012 <br /> f Center Street Parts <br /> Remediation Summary was documented throughout'the life of this case <br /> Free Product: No free product <br /> Soil'Excavation: Unknown <br /> v Groundwater Remediation: Soil vapor extraction o ed iapprogmately <br /> ing <br /> In-Situ Soil/ G approximately r <br /> conducted from November 2003 through November 200 <br /> 190 pounds of TPHg <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 23 feet bgs and the <br /> kr 5i ;6 .�g1 <br /> groundwater gradient is easterly at between 0.001 and 0.005 ft/ft• I <br /> • Estimate of Hydrocarbon Mass in Soil: Prior to remediation, PSC Industria[ Outsourcing <br /> ' (PSC), estimated that approximately 3,486 pounds of TPHg remained in,soil. ;Following: <br /> remediation, approximately 945 pounds of TPHg remained in site soil" �, F <br /> • Groundwater Trends: There are more than 11 years of groundwater monitoring data for <br /> this <br /> Site. Benr"z.'er+-n'ae..;,trends <br /> .�a`are t ssh.oy weq n,�.'below,.rrsource <br /> . area <br /> #(MW-2) <br /> MW-2) and dow,�n gradient,,, <br /> (M -4)'tI <br /> ��- <br /> 1. <br /> lip <br /> .3 <br /> BENZENE Results for MW-2 <br /> 14000 <br /> f. 12000 <br /> 8000 <br /> ' <br /> 2000 <br /> ( 0 � '. is•A •'.].`.w•'An S �a:, `K'.•aur yaw.'.,., 1 . <br /> .y <br /> }.. <br /> i <br /> n BENZENE —Trend <br /> BENZENE Results for MW-4 1 " <br /> i <br /> -_ 1 <br /> 0.9 <br /> t. <br /> i <br /> 0.5 <br /> 0.2 <br /> j, <br /> ' - �w.•r-•_,.r„R'�-;..--,.-. '.s�.�-:t•:.z.-r^�„: .Y s�',g,.e+�l..+'d'.I^ ;k- •.,qr�e+' ,2.�_ �' ,. ...-,. . -. f.- _ .. <br /> Sensitive Receptor Survey <br /> I A Sensitive Receptor Survey (SRS) was conducted by PSC. A records search at the <br /> Department of Water Resources and an on-the-ground survey in the area identified two water <br /> supply wells within a 2,000 foot radius of the Site, one domestic well 1,750 feet east northeast <br /> and one domestic well 2,000 feet east northeast of the Site. Drinking water at and near the Site <br /> ti is currently supplied by the City of Stockton. <br /> I <br /> r <br /> s <br />