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Feasibility Test Report <br /> C A M B R I A JIMCO Truck Plaza <br /> 1022 Frontage Road, Ripon, California <br /> November 16, 2005 <br /> Based on the permeable soil conditions, AS was proposed to remove hydrocarbons from the <br /> saturated zone as well as provide additional dissolved oxygen required for biodegradation of <br /> hydrocarbons within the vadose and saturated zones <br /> Objectives The objectives of the feasibility test were to <br /> • assess the applicability and effectiveness of SVE and combined SVE/AS for the site, <br /> • assess hydrocarbon concentrations and vapor flow rates during SVE and combined SVEIAS, <br /> and <br /> • assess vapor-phase mass removal rate of hydrocarbons by SVE and combined SVE/AS <br /> 3 2 Field Activities <br /> Cambria conducted an SVE test on September 8, 2005 and an SVE/AS test on September 9, <br /> 2005 During the testing, well EW-1 was used as the vapor extraction well, well AS-1 was used <br /> as the air sparge well, and wells MW-2, MW-7, MW-9, and MW-10 were used as the observation <br /> wells A description of the field procedures for the SVE and combined SVE/AS test are <br /> presented below <br /> 3 2 1 SVE Test Procedures <br /> The SVE test consisted of a step test followed by a constant vacuum test <br /> Step Test Cambria conducted a step test to determine the optimum applied vacuum and vapor <br /> extraction rate for the site by applying increasing levels of wellhead vacuum on the extraction <br /> well The step test consisted of five steps starting at a wellhead vacuum of 25 inches of water <br /> column (in WC), and then increased by approximately 25 in WC up to a maximum of 125 in <br /> WC Wellhead vacuum, vapor flowrate, hydrocarbon concentrations and vacuum influence in <br /> the observation wells were recorded every five minutes for each step until the vapor flow rate and <br /> hydrocarbon concentrations had stabilized <br /> Constant Vacuum Test Cambria conducted a constant vacuum test to assess if the hydrocarbon <br /> concentrations at the site would be sustained An optimum extraction vacuum rate for the <br /> constant vacuum test was determined to be approximately 125 in WC based on the maximum <br /> TPHg mass removal rate Wellhead vacuum, vapor flow rate, hydrocarbon concentrations, and <br /> vacuum influence in the observation wells were recorded every 30 minutes during the constant <br /> vacuum test Air samples were collected in Tedlar bags at the beginning and near the end of the <br /> . constant vacuum test The samples were submitted to McCampbell Analytical, a state of <br /> California certified laboratory, and analyzed for total petroleum hydrocarbons as gasoline <br /> 6 <br />