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Chevron Products Company Page 1 Former Chevron Service Station #9-5775. 301 West Kettleman Lane_ Lodi. California September 16, 2002 . INTRODUCTION SECOR International Incorporated (SECOR), on behalf of Chevron Products Company (Chevron), presents operating data for the groundwater extraction (GWE) system at 301 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 August 2002 data collected between July 30 and August 28, 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 prior to an industrial sewer discharge point Pumping through the wells from areas affected by petroleum hydrocarbons prevents migration of these hydrocarbons off-site A treatment system schematic is shown on Figure 3 To assess effectiveness of the GWE system, process samples were collected weekly during this reporting period Sample locations include an influent port (ENFL), 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 During these sampling events, 1NFL, MID -1, MID -2, and EFFL samples 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-dicholoethane (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 (µg/l) ugust 13 and August 28, 2002 MtBE TBA EtBE TAME Ethanol Methanol IlVFL 37 <10 3 <2 <100 <400 MID -1 <2 11 <2 <2 <100 <400 MID -2 <2 11 <2 <2 <100 <400 EFFL <2 <10 <2 <2 <100 <400 En lanat,ons < indicates the constituent was not present at or above the method rporting hmtt shown Between July 30 and August 28, 2002, the GWE system discharged a total of 572,015 gallons of treated groundwater over a period of 30 days (Table 2) As of August 28, 2002, the GWE system has treated a total of 4,023,197 gallons Calculated discharge rates during the August monitoring period ranged from 9 15 to 9 23 gallons per minute (gpm) During the August monitoring period the system extracted approximately 0 1 pounds of TPHg, 0 001 pounds of benzene, and 0 2 pounds of MtBE To date, the system has extracted approximately 8 0 pounds of TPHg, 0 2 pounds of benzene, and 84 2 pounds of MtBE Plots of GWE system mass removal trends and influent groundwater TPHg, 11Chevron1957751Penodic Momtonngl0 & M\Reports\Monthly\Dtscharge Reports120021august 20021August 2002 DR doc