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■ Z1 INC <br /> S stem Installation and Operation <br /> Treatment of the 0 5 gpm effluent stream removed by the groundwater extraction system <br /> was conducted in two stages The first stage of the system consisted of spray and diffused <br /> aeration Removal rates for diffused aeration tanks such as the system installed at the site, <br /> are typically above 95 percent reduction from inlet petroleum hydrocarbon concentration <br /> (CEECON, 1993) An activated carbon system, consisting of two in-line canisters of liquid <br /> phase granular-activated carbon, was then used for the secondary water treatment As <br /> initially configured, the groundwater treatment system was capable of processing up to 10 <br /> gpm of groundwater <br /> The groundwater treatment system design was reviewed by the Regional Board staff and <br /> approved for operation The installation of the groundwater treatment system was <br /> completed and the system was initially started up on September 21 , 1992 CEECON field <br /> personnel conducted site visits from September 1992 to April 1993 to monitor and evaluate <br /> the operation and maintenance of the groundwater treatment system <br /> System Monitoring <br /> On September 24, 1992, CEECON field personnel collected four initial groundwater <br /> treatment system samples 1) influent, 2) post spray aeration, 3) post total aeration, and <br /> 4) an effluent to evaluate performance and destruction efficiency of the groundwater <br /> treatment system Groundwater treatment system samples were collected from the influent <br /> and effluent sample ports on October 2, 1992, October 8, 1992, October 16, 1992, <br /> November 25, 1992, January 25, 1993 and April 2, 1993 to continue evaluating <br /> performance and hydrocarbon removal efficiency of the system (CEECON, 1993) <br /> Water samples collected by CEECON personnel were preserved as required and delivered <br /> with chain-of-custody documents to Excelchem Environmental Laboratories of Citrus <br /> Heights, California for analyses Water samples from the four source points were analyzed <br /> for volatile organics using EPA Test Method 602 and TPH-G as EPA Test Method 8015 <br /> 19150011 005 34 <br />