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• 0 SECOR February 19, 2003 Mr Richard C Prima Jr City of Lodi Public Works Director 221 West Pine Street Lodi, California RE January 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 SECOR www secor com INTERNATIONAL INCORPORATED 3017 Kilgore Road, Suite 100 Rancho Cordova, CA 95670 {�/�1�/�p1161111'1-041 11 /} 11118161-040 01 i�3TpE��L{��'�f�J} �' LL �-/ �'— Lam' E E B 2 1 2003 ENVIRONMENT HEALTH PERMIT/SERVICES 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 December 17, 2002 and January 21, 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 were collected twice monthly during this reporting period 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 were 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) Maximum concentrations of detected constituents are presented below Current and historical analytical results are presented as Table 1 Sampling Port Maximum Constituent Concentration (µg11) November 20 throu h December 17, 2002 MtBE TBA ELBE TAME Ethanol Methanol INFL 32 <10 3 <2 <100 <400 MID -1 <2 <10 <2 <2 X100 <400 MID -2 1 <2 <10 <2 <2 <100 <400 EFFL <2 <10 <2 1 <2 <100 <400 Explanations < indicates the constituent was not eresent at or above the method reeorting limit shown Between December 17, 2002 and January 21, 2003, the GWET system treated and discharged a total of 380,298 gallons of groundwater (Table 2) As of January 21, 2003, the GWET system has I IChevron1957751Penodic Monitormg\O & KReportsNonthiy\Discharge Reports1200A Ianuary 2003 DR doc