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0 0 SECOR INTERNATIONAL S E C � 0�+��r`�4gCpnr1�p1 d1 PL Phi I SFSNICE X03 FEB 17 PH !2: 59 March 14, 2003 Mr Richard C Prima Jr City of Lodi Public Works Director 221 West Pine Street Lodi, California RE February 2003 Discharge Report Former Chevron Service Station 9-5775 301 West Kettleman Lane Lodi, California SECOR Project No 77CH 95775 00 0570 Dear Mr Prima www secor cora 3017 Kilgore Road, Suite 100 Rancho Cordova, CA 95670 916 861 0400 TEL 916 861 0430 FAx SECOR International Incorporated (SECOR), on behalf of Chevron Environmental Management Company (Chevron), presents operating data for the groundwater extraction and treatment (GWET) system at 301 West Kettleman Lane, Lodi, California (Figure 1) Chevron discharges treated groundwater at the subject site under City of Lodi Wastewater Discharge Permit #310 This report presents data collected between January 21, 2002 and February 19, 2003 GROUNDWATER EXTRACTION SYSTEM Extraction and treatment of groundwater was initiated on July 3, 2000 The GWET system consists of extraction wells EX -1, EX -2, and EX -3 (Figure 2) These wells are equipped with submersible pumps connected by mechanical piping to a series of granular activated carbon (GAC) vessels through which groundwater passes prior to discharge to the industrial sewer A treatment system schematic is shown on Figure 3 To assess the effectiveness of the GWET system, water samples are collected twice monthly at four locations, including the influent port (INFL) prior to the first GAC vessel, between the first and second GAC vessels (MID -1), between the second and third GAC vessels (MID -2), and prior to discharge (EFFL) to the industrial sewer The samples collected are analyzed for total petroleum hydrocarbons as gasoline (TPHg), benzene, toluene, ethylbenzene, and total xylenes (BTEX), methyl tertiary butyl ether (MtBE), tertiary amyl methyl ether (TAME), ethanol, methanol, ethylene dibromide (EDB), and 1,2-dichloroethane (1,2 DCA) Samples for this reporting period were collected on February 4, and 19, 2003 Maximum concentrations of detected constituents during this reporting period are presented below Current and historical analytical results are presented as Table 1 Sampling Port Maximum Constituent Concentration (pWI) January 21 throu h February 19, 2003 MtBE TBA EtBE TAME Ethanol Methanol INFL 28 <10 2 <2 <100 <400 MID -1 <2 <10 <2 <2 <100 <400 MID -2 <2 <10 <2 <2 <100 <400 EFFL <2 <10 <2 <2 <100 <400 Explanations indicates the constituent was not present at or above the method reporting limit shown The GWET system treated and discharged a total of 299,804 gallons of groundwater (Table 2) during the reporting period To date, the GWET system has treated and discharge a total of 1Chevron19M51Periodic Monitonngl0 & WReportsWonthiy0ischarge Reports12002\February 2003 DR clot