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t l , <br /> asibility Testing Work Plan <br /> Jimco Truck Plaza <br /> 1022 Frontage Road <br /> Ripon, California <br /> June 23, 2005 <br /> After completion of the step tests, Cambria will conduct a constant vacuum SVE test at the optimal <br /> 'vapor flow rate. The test will be performed continuously for approximately 2 to 4 hrs, depending <br /> upon the observation well vacuum responses and soil vapor chemistry. The purpose of a long-term <br /> constant vacuum test is to allow sufficient time to witness stabilized well vacuums and possible <br /> changes in soil vapor chemistry through pore volume exchange,which are both indicative of air flow <br /> through the subsurface. During this test, Cambria will measure the applied vacuum, hydrocarbon <br /> concentration,and vapor flow rate in the extraction well Cambria will also measure induced vacuum <br /> in all observation wells during and at the end of the test. To confirm hydrocarbon concentration trends <br /> observed in field instruments,vapor samples will be collected from the vapor stream(prior to dilution) <br /> in Tedlar bags at the beginning and end of the test and submitted to Airtoxics Ltd,Inc.a state certified <br /> laboratory for sample analysis. The samples will be analyzed for TPH and benzene, toluene, <br /> 'ethylbenzene, and xylenes(BTEX)by EPA Method TO-3. �jaS? <br /> Following completion of the SVE constant vacuum test on EW-1, a combined SVE/AS test will be <br /> conducted after subsurface conditions have re-equilibrated. The constant vacuum will remain applied <br /> to well EW-1 while air is injected into well AS-1. Air will be injected beneath the water at a <br /> minimum of two injection pressures,approximately 1.5 times the hydrostatic pressure(approximately <br /> 3.2 psi)and 2.5 times the hydrostatic pressure(approximately 5.3 psi). To avoid fracturing and loss of <br /> well control,the injection pressure will not exceed 0.7 psi/ft of overburden(approximately 21 psi). <br /> During the combined SVE/AS test, Cambria will monitor the air sparge injection pressure and flow <br /> rate and the vapor extraction flow rate,hydrocarbon concentration,and applied vacuum in well EW-1. <br /> The vacuum/pressure influence and dissolved oxygen levels in nearby observation wells.will also be <br /> measured periodically. A hydrocarbon vapor sample will be collected in a Tedlar bag from EW-1 / <br /> while sparging at the maximum pressure into the air sparge well AS-T. -- Gv kA,�-law <br /> Test data will be compiled in specially developed field data sheets. The above scope of work will be <br /> performed under the supervision of a registered geologist or professional engineer. <br /> 5.4.2 Equipment and Instrumentation <br /> The SVE/AS test will be performed using an vacuum pump capable of generating 18 to 26 inches of <br /> mercury vacuum and a flow rate of 300 actual cubic feet per minute(acfin). A thermal oxidizer will <br /> be used for soil vapor abatement. An air compressor will be used to inject compressed air into:the <br /> saturated zone,approximately 7 to 10 feet below the groundwater table. A trailer-mounted 70-kilowatt <br /> diesel generator will be used to provide electricity for the extraction and treatment equipment. A <br /> 'i trailer mounted 500-1b propane tank will be used to provide supplemental fuel, if necessary. <br /> 9 <br />