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R. <br />i <br />6 <br />SECOR <br />May 15, 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: April 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.secorcom <br />INTERNATIONAL <br />INCORPORATED 3017 Kilgore Road, Suite 100 <br />Rancho Cordova, CA 95670 <br />916-661.0400 TEL <br />916-861.0430 FAx <br />1177"10 <br />MAY 2 8 2003 <br />ENVIRONMENT HEALTH <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 Keitleman 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 between March 18, and April 15, 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 amyl methyl ether (TAME), ethanol, methanol, ethylene dibromide (EDB), and <br />1,2-dichloroethane (1,2 DCA). Samples for this reporting period were collected on April 1 and 15, <br />2003. Current and historical analytical results are presented as Table 1. Maximum concentrations <br />of detected constituents during this reporting period are presented below. <br />Sampling <br />Maximum Constituent Concentration (pg/1) <br />Port <br />March 18 throu h April 15, 2003 <br />MtBE <br />TBA <br />EtBE TAME <br />Ethanol <br />Methanol <br />(NFL <br />16. <br />X10. <br /><2. <2. <br />X100. <br /><400, <br />MID -1 <br />¢2. <br />X10. <br />c2. �2. <br /><100. <br /><400. <br />MID -2 <br /><2. <br />X10. <br /><2. <2. <br />X100. <br />X400. <br />EFFL <br />c2. <br />X10. <br />c2. c2. <br /><100. <br />¢400. <br />Explanations: <br />< indicates the constituent was not <br />present at or above the method re ortinlimit shown <br />The GWET system treated and discharged a total of 393,748 gallons of groundwater (Table 2) <br />during the reporting period. To date, the GWET system has treated and discharged a total of <br />IAChevron195775\Periodic Monitoring\O & %ReportsWonthlyUscharge Reports120031April 2003 DR.revb.doc <br />A <br />