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i, !k <br /> Operations <br /> If. <br /> • Oxidizer operating temperature will be continuously recorded on a chart recorder. <br /> • FID or PID readings of VEW-1 and VEW-2 will be taken weekly for six months following <br /> ; <br /> start up. These readings will be taken monthly thereafter. <br /> I' <br /> I� <br /> • Air samples will be collected for laboratory analyses of BTEX'lon a quarterly basis to <br /> I, <br /> { quantify the remediation. it <br /> Groundwater Monitoring <br /> • Prior to startup a quarterly groundwater monitoring everi't will be performed. Analyses will <br /> h <br /> . include TPHg, TPHd, BTEX and dissolved oxygen. ; <br /> �t <br /> i • <br /> • Quarterly groundwater monitoring will continue after startup. :Analyses will include TPHg, <br /> TPHd, BTEX and dissolved oxygen. <br /> ii <br /> Operational Changes <br /> i! <br /> • When monitoring indicates that TPHg concentrations in VEW-1 and VEW-2 vapors have <br /> �r <br /> reach one per cent of initial values, the system will be pulsed. <br /> ' r <br /> • In conjunction with the vapor data, the groundwater 1data will be evaluated to assess if the <br /> remediation system can be shutdown. <br /> R <br /> Closure Confirmation <br /> To obtain closure, the following sampling is proposed: <br /> 1 li <br /> When recovery TPHg concentrations reach five per cent of initial values at the end of a <br /> pulse off cycle in VEW-1 and VEW-2, soil samples will be obtained from soil borings <br /> located in former"hot spots". I <br /> • Confirmation groundwater monitoring will be performed at the end of pulse off cycle. <br /> I� <br /> The soils and groundwater will be evaluated against the remedial goals. However, the goals may <br /> not be achievable at the site and may need to be reviewed with they County. During the closure <br /> i� <br /> process, the project will be reviewed for successful removal protection of potential receptors and <br /> exposure pathways, and the efficiency of continuing to run the treatment system. f <br /> SacDP•NUWDPM2iPRAPJ818 W26942ab.dw 4.5 <br /> (0102M) <br /> JI it <br />