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3.0 REMEDIAL ACTIVMES <br /> i <br /> Cambria Environmental Technology, Inc. (currently doing business as CRA) submitted a <br /> Corrective Action Plan and Risk-Based Corrective Action Analysis (CAP) on <br /> September 9, 2005. The CAP recommended DPE as the preferred remedial technology <br /> based on feasibility and cost-effectiveness and proposed groundwater and soil cleanup <br /> goals. San Joaquin County Environmental Health Department (SJCEHD) approved the <br /> CAP in their September 15, 2005 letter to Shell. Maximum contaminant levels (MCLS) f <br /> were established as cleanup goals for this site based on the water quality objectives in <br /> the Regional Water Quality Control Board basin plan. Following the CAP approval, <br /> CRA submitted a Remedial Action Plan (RAP) on November 15, 2005, which outlined <br /> the,tasks for implementing DPE at this site. SJCEHD approved this RAP in their <br /> December 19,2005 letter to Shell. <br /> 3.1 TEMPORARY SOIL VAPOR EXTRACTION SYSTEM <br /> CRA operated a temporary SVE system from July 26, 2006 until November 2, 2006 at <br /> which time the system was shutoff to facilitate installation of the DPE system. The <br /> temporary system extracted from well VEW-7, which is screened from 27.5 to 42.5 feet <br /> below grade. This well was selected as the extraction well for temporary operations <br /> based on soil analytical data collected during well installations. Through <br /> November 2,2006 the SVE system removed a total of 676 pounds TPHg, 3.88 pounds <br /> benzene and 1.97 pounds MTBF <br /> 3.2 DUAL-PHASE EXTRACTION SYSTEM <br /> Installation of the DPE system was completed in March 2007 and was started in April <br /> 2007. The DPE system was designed to extract from wells VEW-1 through VEW-7. A <br /> Solleco trailer-mounted electric catalytic oxidizer (Solleco unit) extracts soil vapor/and <br /> groundwater and abates soil vaporV. Specifically, the Solleco unit is an ECAT (LR) <br /> Series Oxidizer. Downwell stingers target extraction at various elevations at each <br /> extraction point. <br /> Extracted groundwater is pumped from the Solleco unit moisture separator into a <br /> 500-gallon transfer tank. Extracted groundwater is then pumped from the transfer tank <br /> using a transfer pump through silt filters and then three 2,000 pound aqueous-phase <br /> carbon vessels (in series) prior to discharge to the sanitary sewer. Flow meters, pressure <br /> gauges, and sample ports will be installed to control and monitor system operation. <br /> %XX%%(M) 4 CONESTOGA-ROVERS&ASSOCIATES <br />