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Chevron Products Company 1 <br />Duly l2, 200t <br />Or t Former Chevron Service Station #9-5775, 301 West Kettleman Lane, Lodi, California <br />• <br />INTRODUCTION <br />SECOR International Incorporated (SECOR), on behalf of Chevron Products Company <br />(Chevron), presents operating data for the groundwater extraction (GWE) system at the site <br />referenced above (Figures 1 and 2). Chevron discharges treated groundwater at the subject <br />site under City of Lodi Wastewater Discharge Permit #295. <br />Extraction and treatment of groundwater was initiated on July 3, 2000. The GWE system <br />extracts groundwater from site wells EX -1, MW-I4/EX-2, and EX -3. Extracted groundwater <br />is routed through a particulate filter, then three 2,000 -pound liquid phase activated carbon <br />vessels (A, B, and C) plumbed in series. A treatment system schematic is shown on Figure 3. <br />GROUNDWATER EXTRACTION SYSTEM <br />Samples were collected from the influent port, midpoint 1 (between carbon vessels A and B), <br />midpoint 2 (between carbon vessels B and C), and the effluent port on June 6, 13, 20, and 27, <br />2001. During these sampling events, influent (NFL), midpoint 1 (MID -1), midpoint 2 (MID - <br />2), and effluent (EFFL) samples were analyzed for total petroleum hydrocarbons as gasoline <br />(TPHg), benzene, toluene, ethyl -benzene, and total xylenes (BTEX compounds), methyl <br />tertiary butyl ether (MtBE), tertiary butyl alcohol (TBA), di -isopropyl ether (DIPE), ethyl <br />tertiary butyl ether (EtBE), tertiary amyl methyl ether (TAME), ethanol, methanol, ethylene <br />• dibromide (EDB), and 1,2-dicholoethane (1,2 -DCA). Maximum concentrations of detected <br />constituents are presented below. Current and historical analytical information is presented <br />as Table 1. <br />Sampling <br />Constituent (µg11) <br />MtBE <br />TBA <br />EtBE <br />TAME <br />Ethanol <br />Methanol <br />Port <br />INFL <br />1,000 <br />28 <br />56 <br />13 <br />63 <br />ND <br />MID -1 <br />44 <br />ND <br />ND <br />ND <br />ND <br />80 <br />MID -2 <br />ND <br />ND <br />ND <br />ND <br />8.5 <br />56 <br />EFFL <br />ND <br />ND <br />ND <br />ND <br />ND <br />ND <br />Explanations <br />ND = Not Detected above method detection limits <br />Between May 30 and June 27, 2001, the GWE system discharged a total of 358,484 gallons <br />of treated groundwater over a period of 28 days (Table 2). As of June 27, 2001, the GWE <br />0 <br />