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! ■ Work Plan for SVE/AS Feasibility Testing S E C 0 R ARCO Service Station 548 Stockton, California Page 5 of 9 vacuum may be increased or decreased to observe the effect on influent vapor concentrations and/or air flow rate. SVE system influent vapor samples will be collected at the initiation of the test (within two hours of system start-up) and at the completion of the test from the influent soil vapor sample port on the MTS unit. Soil vapor samples will be submitted to a California state certified laboratory for analysis of total petroleum hydrocarbons as gasoline (TPHg) using Environmental Protection Agency (EPA) Method 8015 modified, benzene, toluene, ethylbenzene , and xylenes (BTEX) using EPA Method 8020. Air sample analytical data will be used to calculate mass removal rates and total mass removed as a result of the vapor extraction . Task 2 — AS Feasibility Testing To measure the radius of influence of the AS wells, baseline data (DO concentrations, depth to water, pressure [inches of water] , and wellhead organic vapor concentrations with a PID/FID) will be collected in all site wells prior to system start up. This information will be used to establish a background range for_ mundwater at this site. All valves on the SVE system will be closed and the system will be restarted with 100% dilution air (so that the AS system will operate). Pressure gauges will be installed on the ^!� i AS wells, _ Following system restart a one day air sparge well influence test will be Z conducted on the AS wells. All-site Wells will be monitored tat regular intervals during the test to determine the radius of influence of the AS wells. Depth to water and DO will be measured in the monitoring wells prior to, during , and at the end of the test. During the test induced pressure will be measured in the monitoring wells . The injection pressure, flow rate, and total time of injection will be monitored in the injection well. The field data will be used to determine the effective radius of influence of air sparging at the site. During the test, the SVE system will be r n to monitor for the presence of hydrocarbon vapors using a flame ionization detector (FID) . If the FID readings indicate that hydrocarbon vapors are being recovered , a vapor sample will be collected in a Tedllaro bag and the_e-xtraction blower will be shut off for the remainder of the test. The vapor sample will be labeled and transported under chain-of-custody to the laboratory. The sample will be analyzed for BTEX, TPHg , and MtBE using EPA Method 8260B to confirm the field FID readings. REPORTING Upon completion of the work proposed herein , SECOR will prepare a report summarizing field activities and analytical results of the investigation. The report will be -submitted to Atlantic Richfield Company and the San Joaquin Environmental Health Department (SJEHD) and will include tabulated field and analytical results, along with figures documenting the results of the SVE/AS feasibility testing . The report will also include conclusions and recommendations for further work. In addition , this report will be uploaded into Geotracker.