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� .. /✓may .+m M 1117 Lone Palm Avenue, Suite 201 I (YA Modesto, California -2225 209-579-2221 Fax: 209-579-2225 A S S O C I A T E S INC . (GAC). SVE well VE- 1 will be used as the vapor extraction well during the SVE test. Soil gas vapors will be extracted from extraction well VE- 1 using the blower motor and then passed through the GAC drums in a series arrangement before the vapor is discharged to the atmosphere. Additionally, pilot test hailer accessories will consist of valves to control air flow and gauges to measure flow and vacuum. Magnehelic gauges will be used to measure changes in pressure at selected observation wells during the test. The SVE pilot test will be conducted in three stages, which will involve extracting soil gas from the vadose zone at three different well head applied vacuums and flow rates. Each stage of the test is anticipated to last approximately one to two hours or as field conditions dictate. Three sets of vacuum and flow rate and radius of influence data will be collected by monitoring the extracted soil gas, induced vacuum, and extraction flow rate. Vacuum influence (the change in pressure) will be monitored from VE- 2, VE-3 , MW- 1 , MW-21 Iv1W-3 , MW4, MW-5, MW-7, MW4, MW- 11R and MW42, to evaluate the radius of vacuum influence. During each pilot test the soil gas oxygen concentration will be monitored using a GasTechTM combustible vapor analyzer. The VOC concentrations will also be monitored with a PID. Soil gas samples will be collected at the completion of the test using Summa canisters. Samples will then be delivered under chain-of-custody documentation to a State-certified analytical laboratory and analyzed for TPHg, BTEX, MTBE, TBA, RIPE, TAME, ETBE, 1 ,2-DCA by EPA Method T045 , Vacuum response data will be collected utilizing soil gas extracted at three different flow rates and applied vacuums during each SVE test. The data will be used to demonstrate whether soil gas can be extracted from the vadose zone at flow rates sufficient for effectively remediating the petroleum hydrocarbon and fuel oxygenate impacted vadose zone . Additionally, the SVE unit will also be operated during each AS pilot test, described below. Monitoring data, as described above, and soil vapor samples will be collected and analyzed to evaluate the cumulative effectiveness of operating the SVE system in conjunction with AS. These data, combined with vacuum influence data, will be used to select the appropriate blower for It VE remediation system. Air/Ozone Sparge Pilot Testing Upon completion of the VE pilot test, AS pilot testing will be conducted to evaluate the effectiveness of this technology to remediate dissolved hydrocarbons and fuel oxygenates the saturated zone. First, an AS pilot test will be conducted utilizing the shallow (60 to 65 feet bgs) AS point from SP- 1 . Subsequently, a second AS pilot test will be conducted utilizing the intermediate (80 to 85 feet bgs) AS point from SP- 1 . Each test will be conducted in three stages, while injecting atmospheric air into the saturated zone at approximately 2 to 3, 5, and 10 efm . Each stage of the test is anticipated to last approximately one to two homy or as field conditions dictate. Each AS pilot test will be conducted using an air compressor and associated flow rate and pressure measuring equipment. The change in DO and groundwater level will be periodically measured in the surrounding monitoring wells, soil vapor extraction wells (if applicable), and air sparge wells during the tests. Select wells will have pressure transducers or ra nehelic au cs to measure the change in the groundwater level and pressure durin the test. The concentration o 2 petroleum ry eo-7 c caT ar ons In the extracted soiTg whored for combustibles and oxygen using a GasTechTAt Model GT201 combustible vapor analyzer and for VOC concentrations using a PID . Workplan for Feasibility Studies — Former Stockton 'Imi Company ATC Associates Inc. i S:...t283495 WP for Pilot Testing and SCM ATC Project No. 54,28349.0001 I 7 I I