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SECOR www secorcom <br /> INTERNATIONAL <br /> 5 E C 0 R INCORPORATED 3017 Kilgore Road,Suite 100 <br /> Rancho Cordova CA 95670 <br /> 916 861 0400 TEL <br /> 916 861 0430 FAX <br /> May 15, 2003 FIDI <br /> Mr Richard C Prima Jr <br /> City of Lodi Public Works Director MAY 2 8 2003 <br /> 221 West Pine Street ENVIRUN,MENT HEALTH <br /> Lodi, California 95240 PERMIT/SERVICES <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 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 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 Maximum Constituent Concentration (pgll) <br /> Port March 18 throe h April 15, 2003 <br /> MtBE TBA EtBE TAME Ethanol Methanol <br /> INFL 16 <10 <2 <2 <100 <400 <br /> MID-1 <2 <10 <2 <2 <100 <400 <br /> MID-2 <2 <10 <2 <2 <100 <400 <br /> EFFL <2 <10 <2 <2 <100 <400 <br /> Explanations <br /> y <indicates the constituent was not present at or above the method reporting limit 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 /> 11Chevron1957751Penodic Monitoring\O&M\Reports\Monthly\Discharge Reports120031Apnl 2003 DR revb doo <br /> - - -- - — - - <br />