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. Petroleum hydrocarbons were detected in ground water samples collected from on-site <br /> monitoring wells ATR-2, ATR-3, and ATR-4 during quarterly sampling in October 1992. <br /> On December lb, 1991, Brown and Caldwell performed a series of vapor extraction pilot <br /> tests at the Site The results of the test are contained in a report prepared by Brown and <br /> Caldwell dated February 18, 1992. The results of the tests indicated that the subsurface <br /> conditions at the Site were favorable to soil venting remediation techniques <br /> ARCO plans to implement a vapor extraction and ground water treatment system to <br /> remediate petroleum hydrocarbons in soil and ground water at the Site Brown and <br /> Caldwell is in the process of designing the remediation system for the Site A <br /> remediation plan dated May 1, 1993 was prepared by Brown and Caldwell and submitted <br /> to the PHS-EHD. <br /> 5.0 PROPOSED WORK <br /> • <br /> The proposed work to be performed by Roux as part of the UST removal project will <br /> include the following <br /> • Observe the removal of the USTs and product lines and the excavation of soil in <br /> and around the existing USTs and product lines. <br /> • Collect samples of native soil at intervals of 20 linear feet from the base of the <br /> product line trenches <br /> • Collect a water sample from the standing water in the tank cavity excavation <br /> • Collect composite samples from the stockpiled soil. <br /> • Submit the soil samples to a California Department of Health Services certified <br /> laboratory for chemical analysis <br /> • Supervise the disposal, and, if required, on-site aeration of the stockpiled soil <br /> • Oversee the installation of tank cavity wells and subsurface piping for use in a <br /> future soil and ground water remediation system. <br /> 3 Doc #Ars4wo115 <br />