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is <br /> If <br /> CHRONOLOGY <br /> See prior reports for priod from- 03/31/92 to 01/13/93 <br /> 02/23/93 <br /> Collect influent and effluent samples of the system, and vapor <br /> samples from VSB3, VSB5, VSB9, VSB11 and MWS ;for analysis at: <br /> WEGE laboratory. Flow rate 94 . 21cfm. Add carbon canister. <br /> 03/15/93 j <br /> Collect influent and effluent samples of the, Jsystem, and <br /> vapor samples__trom VSB3, VSB5, VSB9, and MW5 f'or analysis at <br /> WEGE laboratory. Flow rate 89 . 73 cfm: Add carbon canister. <br /> 04/15/93 <br /> Note vapor breaktrough on arival at site . Collect influent; <br /> g and effluent samples of the system, and vapor: samples from <br /> i VSB3 , VSB5,' VSB9, and MW5 for analysis at WEGE laboratory. <br /> Flow rate 85. 85 cfm. Shut down system. 3 <br /> During the sampling, Mary Meays, San Joaquin .ICounty Health, <br /> visited - the site to discuss with George Converse, Western <br /> Geo-Engipeers, the need for, and location of ai - conformation <br /> soil boring. <br /> 04/1G/93 3 <br /> Exchange carbon one canister. Restart system. Collect <br /> influent and effluent samples of the system, £o47 analysis at <br /> WEGE laboratory. Flow rate 85 . 85 cfm. <br /> i <br /> 04/23/93 a <br /> f Exchange carbon all canisters . Collect ',influent and <br /> ". effluent samples of the system, for analysis at WEGE <br /> j laboratory. Flow rate 85 . 85 cfm. <br /> VAPOR SAMPLING <br /> i <br /> On site sample analysis is performed using a Photovac 10550 PID . <br /> chromatograph. The chemical make up of the vapor produced} at the <br /> site has changed with.. vapor extraction. The light1' hydrocarbons <br /> have been depleted and the heavier hydrocarbons± are now the <br /> dominate hydrocarbons: being produce. Because of this it j is no '. <br /> longer practical .to perform on site analysis with the 10S50 . <br /> f i i S <br /> a ' <br /> i <br /> page 2 of RG04, 04/30/93 <br />