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cy 23 April 2002 AGE-NC Project No 95-0142 Page 14 of 16 properly labeled,and transported to a DHS-certified laboratory,in a chilled container under chain-of- custody procedure, for analysis During the "start-up" period for the ground water extraction system, operational parameters and ground water samples will be collected on a daily basis The anticipated start-up period will be approximately two weeks During the "start-up" period, five model 3001 Solinst Levelogger pressure transducers may be installed in the shallow ground water monitoring wells Weekly data will be collected from the ground water level transducers Water samples from the discharge line will be collected and analyzed to evaluate the effectiveness of the treatment system If the analytical results indicate that detected hydrocarbon compounds are below the allowable discharge limit, AGE will request the City of Stockton to allow continuous discharge directly from the treatment system into the sanitary sewer The GAC media will be replaced once the detected hydrocarbon compounds exceed the allowable discharge limits in water samples analyzed from the treatment system 46 SOIL VAPOR EXTRACTION SYSTEM DESIGN Initiation of an SVE system is proposed within the core petroleum hydrocarbon-impacted soil area The SVE system will consist of the four existing, dual-completed SVE wells VW-1 to VW-4 (Figure 2) In order to maximize the efficiency of the clean-up efforts, a continual 24-hour per day operation of the SVE unit is planned A catalytic destruction process is proposed for the recovered hydrocarbon vapor by utilizing a direct electric-heated catalytic-oxidizer soil VES The VES will be connected through a manifold box to the vapor recovery wells and should be able to operate between 150 and 200 cubic feet per minute (cfm) Soil hydrocarbon vapor will be extracted from the proposed configuration of extraction wells using a vacuum blower and routed to the oxidizer Supplemental energy (i e electricity) will be supplied to the heating coils of the SVE system to maintain an optimal temperature for a maximum destruction rate of hydrocarbon vapor A typical destruction rate of 95% of hydrocarbon vapors is expected throughout the entire cleanup duration Specifications of the system is illustrated in Appendix A Advanced GeoEnvironmental,Inc