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• <br />0 <br />Chevron Products Company <br />I ormer Chevron Service Station 49-5775 301 West Keltleman Lanc Lodi, California <br />INTRODUCTION <br />P.1g, I <br />September 18, 2401 <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 I 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-14/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 i (between carbon vessels A and B), <br />midpoint 2 (between carbon vessels B and C), and the effluent port on August 2, 8, 15, 21, <br />and 29, 2001 During these sampling events, influent (INFL), midpoint 1 (MID -1), midpoint <br />2 (MID -2), and effluent (EFFL) samples were analyzed for total petroleum hydrocarbons as <br />gasoline (TPHg), benzene, toluene, ethyl -benzene, and total xylenes (BTEX compounds), <br />methyl tertiary butyl ether (MtBE), tertiary butyl alcohol (TBA), di -isopropyl ether (DIPE), <br />ethyl tertiary butyl ether (EtBE), tertiary amyl methyl ether (TAME), ethanol, methanol, <br />ethylene dibromide (EDB), and 1,2-dicholoethane (1,2 -DCA) Maximum concentrations of <br />detected constituents are presented below Current and historical analytical information is <br />presented as Table 1 <br />Sampling <br />Constituent (µg11) <br />Port <br />TPHg <br />MtBE <br />TBA <br />EtBE <br />TAME <br />Ethanol <br />INFL <br /><100 <br />620 <br />75 <br />25 <br />59 <br />10 <br />MID -1 <br /><50 <br />40 <br /><5 0 <br /><0 50 <br /><0 50 <br />5 8 <br />MID -2 <br /><50 <br /><0 50 <br /><5 0 <br /><0 50 <br /><0 50 <br />72 <br />EFFL <br /><50 <br /><0 50 <br /><5 0 <br /><0 50 <br /><0 50 <br /><5 0 <br />Explanations <br />< indicates the constituent was not present at or above the method reporting limit shown <br />Between August 2 and August 29, 2001, the GWE system discharged a total of 417,173 <br />gallons of treated groundwater over a period of 27 days (Table 2) As of August 29, 2001, <br />