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i <br /> Stantec <br /> Site History and Previous Investigations <br /> Chevron and ARCO Commingled Plume No. CP0034 <br /> October 26, 2011 <br /> Remedial Performance Summary <br /> A groundwater extraction (GWE)system was operated intermittently from 1984 to 1996. The SVE <br /> and AS systems were initiated on January 1, 1995 .and May 5,. 1995, respectively. The SVE <br /> system is comprised of 14 SVE wells (V-1 through V-12 and E-6) and an Airex Katox 100 catalytic <br /> oxidizer. The SVE system was shutdown on March 1, 2001, due to low influent concentrations. <br /> Prior to shutdown, the SVE system removed approximately 4,892 lbs of GRO and 61.3 lbs of <br /> benzene. <br /> The AS system consists of eight AS wells (S-1 through S-6, S-8, and S-9) and a 7.5-hp blower <br /> (MD Pneumatics Model 3202). The AS system was shutdown on April 12, 2007 with the <br /> approval of SJCEHD. <br /> i <br /> i <br /> ' I <br /> I <br /> i <br /> i <br /> 94275 Site History and Previous Investigations.doc 4 <br />