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r <br /> Groundwater Extraction and Treatment System Evaluation June 5, 1993 <br /> Sebastian Vineyards/Woodbridge Cellars CEECON <br /> was completed and the system was started-up on September 21, 1992. CEECON field <br /> personnel conducted site visits from September 1992 through April 1993, to monitor and <br /> evaluate the operation and maintenance of the GTS. On September 24, 199A', CEECON <br /> field personnel collected four initial GTS samples (influent [GTS-INF], post spray aeration <br /> [GTS-PSAj, post total aeration [GTS-PTA], and an effluent [GTS-EFF]) to evaluate <br /> performance and destruction efficiency of the GTS. GTS samples were then collected from <br /> the influent and effluent sample ports on October 2, 1992; October 8, 1992; October 16, <br /> 1992; November 25, 1992; January 25, 1993; and April 2, 1993 to continue evaluating <br /> performance and hydrocarbon removal efficiency of the GTS. During these site visits, <br /> operation and maintenance of the GTS was conducted; including: checking and/or replacing <br /> filters; adjusting the flow rate; and inspecting the water conditioning unit. <br /> LABORATORY METHODS <br /> All GTS samples were preserved as required by the applicable analytical method and <br /> delivered with Chain of Custody Records to Exelchem Environmental Labs of Citrus <br /> Heights, California, a state-certified laboratory (Hazardous Waste Testing Laboratory <br /> Certification #1760) for water analyses. Water samples collected from the influent, post <br /> spray aeration, post total aeration, and effluent sample ports were analyzed for gasoline <br /> constituents benzene, toluene, ethylbenzene, and total xylenes (BTEX) and total petroleum <br /> hydrocarbons as gasoline (TPHg) by modified EPA Methods 8015/602. Chain of Custody <br /> Records are attached. <br /> RESULTS OF LABORATORY ANALYSES <br /> Laboratory analytical results of water samples collected from the GTS influent, post spray <br /> aeration, post total aeration, and effluent sample ports are shown on Table 1, Results of <br /> Laboratory Analyses of Water Samples. Influent GTS samples indicated TPHg <br /> concentrations from nondetectable (less than 50 parts per billion [ppb]) to 220 ppb, and <br /> 4 <br />