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CHRONOLOGY <br /> See prior reports for period from 03/31/92 to 03/15/93 <br /> 04/15/93 <br /> Note vapor breakthrough on arrival at site . Collect influent <br /> and effluent samples of the system, and vapor samples from <br /> VSB3 , VSB5, VSB9, and MWS 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-Engineers, 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 /> 05/14/93 <br /> Add carbon canister Collect influent and effluent samples <br /> of the system, and vapor samples from VSB3 , VSB5, VSB9, <br /> VSB11, and MW5 for analysis at WEGE laboratory Flow rate <br /> 85 . 94 cfm. <br /> 06/18/93 <br /> Add carbon canister Collect influent and effluent samples <br /> of the system, and vapor samples from VSB3 , VSB5, VSB9, <br /> VSB11, and MWS for analysis at WEGE laboratory Flow rate <br /> 88 95 cfm. <br /> 07/19/93 <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 82 . 36 cfm. Change out 2 carbon <br /> canisters <br /> • <br /> page 2 of R604 , 07/09/93 <br />