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4 <br /> CHRONOLOGY <br /> See prior reports for priod from 03/31/92 to 12/01/92 <br /> 12/01/92 <br /> Collect influent and effluent samples of the system for <br /> analysis at WEGE laboratory. Flow rate 87 cfm <br /> Drain water from vapor lines . <br /> 12/07/92 <br /> Collect influent and effluent samples of the system for <br /> analysis at WEGE laboratory Flow rate 87 cfm <br /> Drain water from vapor lines . <br /> 12/09/92 <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 72 cfm <br /> Drain water from vapor lines Change out carbon canisters . <br /> 01/13/93 <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 85 . 39cfm. <br /> Drain water from vapor lines Change out carbon canisters <br /> 02/23/93 <br /> Collect influent and effluent samples of the system, and vapor <br /> samples from VSB3 , VSB5, VS29, VSB11 and MWS 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 VS33 , VSB5, VSB9, and MW5 for analysis at <br /> WEGE laboratory. Flow rate 89 73 cfm. Add carbon canister <br /> page 2 of R604 , 04/07/93 <br />