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0 <br />• <br />10 <br />S E C O R <br />January 15, 2003 <br />Mr Richard C Prima Jr <br />City of Lodi Public Works Director <br />221 West Pine Street <br />Lodi, California <br />RE December 2002 Discharge Report <br />Former Chevron Service Station 9-5775 <br />301 West Kettleman Lane <br />Lodi, California <br />SECOR Project No 77CH 95775 00 0570 <br />Dear Mr Prima <br />SECOR www secor Com <br />INTERNATIONAL <br />INCORPORATED 3017 Kilgore Road Suite 100 <br />Rancho Cordova CA 95670 <br />916 861 0400 TEL <br />916 861 0430 Fax <br />I! l <br />JAN 2 1 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 Kettleman Lane, Lodi California (Figure 1) Chevron discharges treated <br />groundwater at the subject site under City of Lodi Wastewater Discharge Permit #310 This report <br />presents data collected between November 20 and December 17, 2002 <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 were collected twice monthly <br />during this reporting period at four locations, Including the influent port (INFL) prior to the first GAC <br />vessel, between the first and second GAC vessels (MID -1), between the second and third GAC <br />vessels (MID -2), and prior to discharge (EFFL) to the industrial sewer The samples collected were <br />analyzed for total petroleum hydrocarbons as gasoline (TPHg), benzene, toluene, ethylbenzene, and <br />total xylenes (BTEX), methyl tertiary butyl ether (MtBE), tertiary amyl methyl ether (TAME), ethanol, <br />methanol, ethylene dibromide (EDB), and 1,2-dichloroethane (1,2 DCA) Maximum concentrations <br />of detected constituents are presented below Current and historical analytical results are presented <br />as Table 1 <br />Sampling <br />Port <br />Maximum Constituent Concentration (µg11) <br />November 20 throu h December 17, 2002 <br />MtBE <br />TBA <br />EtBE <br />TAME Ethanol <br />Methanol <br />INFL <br />40 <br /><10 <br />3 <br /><2 <100 <br /><400 <br />MID -1 <br /><2 <br /><10 <br /><2 <br /><2 <100 <br /><400 <br />MID -2 <br /><2 <br /><10 <br /><2 <br /><2 <100 <br /><400 <br />EFFL <br /><2 <br /><10 <br /><2 <br /><2 <100 <br /><400 <br />Explanatlons <br />< indicates the constituent was not <br />present at or above the method reporting limit shown <br />Between November 20 and December 17, 2002, the GWET system treated and discharged a total of <br />704,243 gallons of groundwater (Table 2) As of December 17, 2002, the GWET system has treated <br />I IChevron1957751Periodic Mondoringl0 & M1ReportsWonthlyQscharge ReporW20021December 21302 DR <br />