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' 6.0 CONTINGENCY PLAN <br /> The CVRWQCB has requested the preparation of a contingency plan for implementing <br /> other remediation procedures in the event the bioremediation system fails to show <br /> significant cleanup of soil and groundwater <br />' In the preceding sections, we have shown that the bioremediation has already shown <br /> significant cleanup of the soil, so the immediate need for a contingency plan is questionable <br />' Since GeoAudit was requested not to impact or treat groundwater, no cleanup has been <br /> observed <br />' However, as stated in the FRP, GeoAudit will utilize a Vapor Extraction System (VES) in <br /> the event that the microbiologist determines that the bioremediation project has become <br />' ineffective The VES to be employed will utilize an internal combustion (IC) engine to <br /> extract hydrocarbon vapors from the soil The VES will be combined with a blower to <br /> provide an air sparging system (AS) for the remediation of the groundwater <br />' The following items presents more details for the contingency plan <br />' • Seven remediation wells (VW-1 through VW-7) as well as MW-4 and MW-5, will be <br /> used for vapor extraction The existing blower lines will be utilized and enlarged to <br /> accommodate 2-inch PVC piping <br /> ® MW-14 and EW-1 will be utilized for airs ar in A new air line will be piped to <br /> P g g PP <br /> EW-I <br /> I <br /> 0 The VES and AS systems will operate on a 24-hour basis This exclude routine <br /> Imaintenance and monitoring <br /> • Air samples will be collected on a monthly basis, groundwater will be monitored <br /> Iquarterly basis, according to the program required by the CVRWQCB <br /> 0 A pumping test (24 hour) will be performed on EW-1 to more accurately determine <br /> I aquifer characteristics This will assist in determining a capture zone for the <br /> implementation of a limited, interim pumping of the groundwater <br /> • Extracted groundwater will be stored in an above-ground tank and sampled If <br /> extracted groundwater cannot be discharged into the City of Lodi sanitary sewer (or <br /> storm drain) system, the groundwater will be treated in the above-ground tank via <br /> rbioremediation The inoculum will be applied directly to the groundwater in the tank <br /> Since this will be a controlled system, no special permitting will be necessary <br /> • Treated groundwater will be sampled monthly Samples will be analyzed of TPH as <br /> Ceo6�ca1 Awht Sen+a+.Iee 1 <br /> 1 57,K;ewbn kr/6.p1 <br />