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Page 9 <br /> Geological reckxiesInc. <br /> Additional Pilot Test Work Plan <br /> Project No.770.2 <br /> October 30,2008 <br /> These three high'vacuum-tests will be used to determine"the contaminant mass.-remova in <br /> � fsvN--4-liquid and-vapor phases`and investigate the effectiveness of dual phase extraction method for <br /> groundwater.and soil remediation-at the site. <br /> 4.5 Effectiveness Evaluation <br /> As stated above in Section 4.4 the amount of pressure necessary for demonstrating vacuum <br /> influence in soil vapor extraction technology is generally regarded as at least 0.1 inches of <br /> water vacuum. The radius of influence of the dual phase extraction will be estimated by <br /> comparing the changes in pressures and"depth to Water at the monitoring wells that are `yam <br /> located at varying distances from the extraction wells. <br /> Excelchem Environmental Labs of Roseville. California performs air analysis (EPA Methods <br /> 8015M and TQ-1) for r TPH-diesel, TPH-gasoline and BTEX constituents in-vapor. GTI will <br /> take at least 9 vapor samples duringpilot-test-extraction and will work with Excelchem (or <br /> _ <br /> other labs)to quantify mass removal rates during the pilot.test for all 3 scenarios explained in <br /> Section 4.4. <br /> 5.0 SCHEDULE AND REPORTING <br /> Geological Technics Inc. anticipates beginning fieldwork no later than 30 days after work <br /> plan approval and USTCFP cost pre-approval. The information gathered during this phase of <br /> work will be presented in.a report, which will include a summary of the pilot tests with <br /> extraction pressure/vacuum influence, water level and OVM reading data. Dr. Ray <br /> Kablanow, a registered professional geologist, will supervise the project. Copies of the <br /> report will be forwarded to .both the appropriate County and State regulatory agencies (SJC <br /> PHS/EHD and CRWQCB-CVR). Groundwater monitoring, involving all of the site's wells, <br /> will occur on a quarterly basis. A report will be issued for each monitoring event and <br /> submitted to the County and State agencies. <br /> 1 <br /> f <br />