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6 <br />S E C O R <br />July 11, 2003 <br />Mr. Richard C. Prima Jr. <br />City of Lodi Public Works Director <br />221 West Pine Street <br />Lodi, California 95240 <br />RE: June 2003 Discharge Report <br />Former Chevron Service Station 9-5775 <br />301 West Kettleman Lane <br />Lodi, California <br />SECOR Project No.: 77CH.95775.02.0570 <br />Dear Mr. Prima: <br />SECOR www.secor.com <br />INTERNATIONAL <br />INCORPORATED 3017 Kilgore Road, SWe 100 <br />Rancho Cordova, CA 95670 <br />916-861'0400 TEL <br />916-861-0430 FAx <br />JUL 16 2003 <br />ENVIRONMEN f HFALI H <br />PERMIT/SERVICES <br />SECOR International Incorporated (SECOR), on behalf of Chevron Environmental Management <br />Company (Chevron), presents operating data for the groundwater extraction and treatment (GWET) <br />system at 301 West Kettleman Lane, Lodi, California (Figure 1). Chevron discharges treated <br />groundwater at the subject site under City of Lodi (City) Wastewater Discharge Permit #328. This <br />report presents data collected on June 5, 2003 and June 18, 2003. <br />GROUNDWATER EXTRACTION SYSTEM <br />Extraction and treatment of groundwater was initiated on July 3, 2000. The GWET system consists <br />of extraction wells EX -1, EX -2, and EX -3 (Figure 2). These wells are equipped with submersible <br />pumps connected by mechanical piping to a series of granular activated carbon (GAC) vessels <br />through which groundwater passes prior to discharge to the industrial sewer. A treatment system <br />schematic is shown on Figure 3. <br />To assess the effectiveness of the GWET system, water samples are collected twice monthly at four <br />locations, including the influent port prior to the first GAC vessel (INFL), between the first and second <br />GAC vessels (MID -1), between the second and third GAC vessels (MID -2), and prior to discharge <br />(EFFL) to the industrial sewer. The samples collected are analyzed for total petroleum hydrocarbons <br />as gasoline (TPHg), benzene, toluene, ethylbenzene, total xylenes (BTEX), methyl tertiary butyl <br />ether (MtBE), tertiary butyl alcohol (TBA), ethyl tertiary butyl ether (EtBE), tertiary amyl methyl ether <br />(TAME), ethanol, methanol, ethylene dibromide (EDB), and 1,2-dichloroethane (1,2 DCA). Samples <br />for this reporting period were collected on June 5 and 18, 2003. Current and historical analytical <br />data are presented as Table 1. Maximum concentrations of detected constituents during this <br />reporting period are presented below. <br />Sampling <br />Port <br />Maximum Constituent Concentration (µg11) <br />MtBE <br />TBA <br />EtBE TAME <br />Ethanol <br />Methanol <br />INFL <br />17 <br /><10. <br /><2. <2. <br /><100. <br /><400. <br />MID -1 <br /><2. <br /><10. <br /><2. <2. <br /><100. <br /><400. <br />MID -2 <br /><2. <br /><10. <br /><2. <2. <br /><100. <br /><400. <br />EFFL <br /><2. <br /><10. <br /><2. <2. <br /><100. <br /><400. <br />Explanations: <br />Indicates the constituent was not <br />present above the method reporfing <br />limit shown <br />I: Ghevron195T151Perlodic Monitoringl0 & WReportsWonthly0scharge Reports120031June 2003 DR.doc <br />c <br />