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feasibility Testing Work Plan <br /> Jimco Truck Plaza <br /> C A M B R I A 1022 Frontage Road <br /> Ripon, California <br /> U _ May 18, 2005 <br /> Aft completion of the step tests, Cambria will conduct a constant vacuum SVE test at the optimal <br /> vapor\thebservation <br /> rate. The test will be performed continuously for approximately 2 to 4 hrs, depending <br /> upon 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 wel during and at the end of the test. To confirm hydrocarbon concentration trends <br /> observed infield instru ents,vapor samples will be collected from the vapor stream(prior to dilution) <br /> in Tedlar bags at the be inning and end of the test and submitted to a state certified laboratory for <br /> analysis. <br /> Following completion of the VE constant vacuum test on EW-1, a combined SVE/AS test will be <br /> conducted after subsurface con itions have re-equilibrated. The constant vacuum will remain applied <br /> to well EW-1 while air is injec d into well AS-1. Air will be injected beneath the water at a <br /> minimum of two injection pressure approximately 1.5 times the hydrostatic pressure(approximately <br /> 3.2 psi)and 2.5 times the hydrostatic ressure(approximately 5.3 psi). To avoid fracturing and loss of <br /> well control, the injection pressure wi not exceed 0.7 psi/ft of overburden (approximately 21 psi). <br /> During the combined SVE/AS test, Ca ria will monitor the air sparge injection pressure and flow <br /> rate and the vapor extraction flow rate,hyd ocarbon concentration,and applied vacuum in well EW-1. <br /> The vacuum/pressure influence and dissolve oxygen levels in nearby observation wells will also be <br /> measured periodically. A hydrocarbon vapor ample will be collected in a Tedlar bag from EW-1 <br /> while sparging at the maximum pressure into th air sparge well AS-1. <br /> Test data will be compiled in specially developed f Id data sheets. The above scope of work will be <br /> performed under the supervision of a registered geo gist or professional engineer. <br /> 5.4.2 Equipment and Instrumentation <br /> The SVE/AS test will be performed using an vacuum pum capable of generating 18 to 26 inches of <br /> mercury vacuum and a flow rate of 300 actual cubic feet per inute(acfm). A thermal oxidizer will <br /> be used for soil vapor abatement. An air compressor will be ed to inject compressed air into the <br /> saturated zone,approximately 7 to 10 feet below the groundwater ble. A trailer-mounted 70-kilowatt <br /> diesel generator will be used to provide electricity for the extracts n and treatment equipment. A <br /> trailer mounted 500-1b propane tank will be used to provide supplem tal fuel, if necessary. <br /> A Horiba gas analyzer, calibrated to iso-butlylene, will be used to field measure oxygen, carbon <br /> dioxide,and hydrocarbon vapor concentrations from the extraction well. A TSI thermoanemometer <br /> 9 <br />