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r <br /> 4 <br /> CHRONOLOGY <br /> E <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 MW5 for analysis at <br /> WEGE laboratory Flow rate 94 . 21cfm Add carbon canister. <br /> 03/15/93 <br /> Collect influent and effluent samples of the system, and <br /> vapor samples from VSB3, VSB5, VSB9, and MW5 for 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 /> and effluent samples of the system, and vapor samples from <br /> VSB3 , VSB5, VSB9, and MW5 for analysis at WEGE laboratory <br /> Flow rate 85 . 85 cfm Shut down system <br /> During the sampling, Mary Meays, San Joaquin County Health, <br /> visited the site to discuss with George Converse, Western <br /> Geo-Engizneers, the need for and location of a conformation <br /> soil boring <br /> 04/16/93 <br /> Exchange carbon one canister Restart system. Collect <br /> influent and effluent samples of the system, for analysis at <br /> WEGE laboratory Flow rate 85 . 85 cfm <br /> 04/23/93 <br /> Exchange carbon all canisters Collect influent and <br /> effluent samples of the system, for analysis at WEGE <br /> laboratory Flow rate 85 . 85 cfm <br /> VAPOR SAMPLING <br /> On site sample analysis is performed using a Photovac lOS50 PTD <br /> chromatograph The chemical make up of the vapor produced at the <br /> site has changed with vapor extraction The light hydrocarbons <br /> have been depleted and the heavier hydrocarbons are now the <br /> dominate hydrocarbons being produce Because of this it is no <br /> longer practical to perform on site analysis with the 10550 . <br /> r <br /> page 2 of R604 , 04/30/93 <br />