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0 Pi 6 SECOR December 13, 2002 Mr Richard C Prima Jr City of Lodi Public Works Director 221 West Pine Street Lodi, California RE November 2002 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 916 861 0400 Tit 916 861 0430 FAX M gVF D E C 18 2002 EW RM1�H /SERVISES PE SECOR International Incorporated (SECOR), on behalf of Chevron Environmental Management Company (CEMC), presents operating data for the groundwater extraction (GWE) system at 301 West Kettleman Lane, Lodi California (Figure 1) CEMC discharges treated groundwater at the subject site under City of Lodi Wastewater Discharge Permit #310 This report presents data collected between October 22 and November 20, 2002 GROUNDWATER EXTRACTION SYSTEM Extraction and treatment of groundwater was initiated on July 3, 2000 The GWE system consists of extraction wells EX -1, EX -2, and EX -3 (Figure 2) These wells are equipped with submersible pumps connected through 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 GWE system, water samples were collected twice during this reporting period at locations, which include an 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, ethyl -benzene, and total xylenes (BTEX compounds), 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 (}tg/l) October 22 through November 20, 2002 MtBE TBA EtBE TAME Ethanol Methanol INFL 48 <10 3 <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 Between October 22 and November 20, 2002, the GWE system discharged a total of 551,868 gallons of treated groundwater over a period of 29 days (Table 2) As of November 22, 2002, the 1Chevron1957751Penodic Monitonng\O & M1ReportsWonthiy0scharge Reports120021November 2002 DR doc