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l <br /> Project 00760.02 ; <br /> 11 February 1991 <br /> accumulator/water knockout device. The <br /> combustor unit and <br /> accumulator/water knockout device were placed within a protective fenced <br /> enclosure. The combustor unit was designed to destroy by combustion <br /> hydrocarbon gases in the extracted soil gases before gases are discharged <br /> into the atmosphere. After permitting through the, San Joaquin County Air <br /> Pollution Control District, the system equipment was delivered to the <br /> site, installed on an equipment pad, and lconnected to the extraction <br /> system already in place. A propane trap wagon that served as a <br /> supplemental fuel source was kept in thel enclosure with the system <br /> equipment. A site plan of the extraction system and system equipment is <br /> presented in Figure 1. <br /> 1 <br /> OPERATION, MAINTENANCE AND MONITORING <br /> 'i <br /> The combustor unit was designed to operate. continuously 24 hours a day. <br /> EVAX personnel periodically monitored the vapor extraction and <br /> remediation system. Monitoring included analyses of the influent to <br /> document the progress of the remediation.'' In addition, compliance <br /> sampling of the exhaust stream to the atmosphere was conducted to ensure <br /> the system operated within permitted emission guidelines. The extraction <br /> points were also monitored. Extraction at an individual well or probe <br /> was discontinued when hydrocarbon vapor concentration was reduced in the <br /> vicinity of that well or probe. j <br /> i <br /> EVAX recommends that a copy of this report ',jbe submitted to Ms. Laurie A. <br /> Cotulla of the San Joaquin County Public Health Services, Environmental <br /> Health Division. <br /> If you have any questions, please do not hesitate to call . <br /> Sincerely, <br /> EVAX Technologies, Inc. <br /> ei� i <br /> P <br /> Christopher J. Peoples <br /> Project Engineer <br /> tw <br /> Enclosure: Site Plan <br /> Monitoring Summary <br /> r <br /> 'i <br /> - 2 - <br />