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c <br />6 <br />EQR�JE*3: 0 R <br />,}UN 16 2003 <br />June 13, 2003 -AEN-t HEALTH <br />ENpin,-A' T�SERVICES <br />Mr. Richard C. Prima Jr. <br />City of Lodi Public Works Director <br />221 West Pine Street' <br />Lodi, California 95240 <br />RE: May 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 <br />INTERNATIONAL <br />INCORPORATED <br />www.secorcom <br />3017 Kilgore Road, Suite 100 <br />Rancho Cordova, CA 95670 <br />916-861-0400 Ta <br />916-861-0430 FAx <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 May 6, 2003 and May 20, 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 May 6 and 20, 2003. Current and historical analytical data <br />are presented as Table 1. Maximum concentrations of detected constituents during this reporting <br />period are presented below. <br />Sampling <br />Maximum Constituent Concentration (µg/1) <br />Port <br />MtBE <br />TBA EtBE TAME Ethanol <br />Methanol <br />INFL <br />14' <br /><10. <2. <2. <100. <br /><400. <br />MID -1 <br /><2: <br /><10. -�2. <2. <100. <br /><400. <br />MID -2 <br /><2. <br /><10. <2. <2. X100. <br /><400. <br />EFFL <br /><2. <br />X10. 1 <2. <2. <100. <br />1 X400. <br />Explanations: <br />indicates the constituent was not present above the method reporting limit shown <br />Note: <br />Influent sample collected on May 6, 2003, not submitted for chemical analysis. <br />1:1Chevron1957751Periodic Monitoring\O & M\Reports\Monthly\Discharge Reports12003Way 2003 DR.doc <br />