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Chevron Products Company page 2 <br /> Former Chevron Service Station#9-5775 301 West Kettleman Cane,IAdr,California July 15,2002 <br /> Maximum Constituent Concentrations( ) <br /> April 29 through 30,2002 <br /> Zone <br /> TPHg Benzene Toluene Ethyl- Xylenes MtBE TBA EtBE TAME <br /> benzene <br /> A-zone 4,500 <0 5 <0 5 <0 5 <0 5 15,000 7,700 180 130 <br /> B-zone <50 <05 <0 5 <0 5 <0 5 0 8 <5 <0 5 <0 5 <br /> C-zone <50 <0 5 <05 <0 5 <0 5 <0 5 <5 <0 5 <05 <br /> Exylanatrons <br /> µg/1=Micrograms per liter <br /> <Indicates the constituent was not present at or above the method reporting hmrt shown <br /> 3.0 EVALUATION OF GROUNDWATER EXTRACTION AND SOIL VAPOR <br /> EXTRACTION SYSTEMS <br /> GWE and SVE systems were initiated on July 3, 2000 Certified analytical reports and <br /> chain-of-custody documentation and remedial system operation and maintenance field data <br /> sheets are included in Attachments E and F, respectively A brief description and <br /> performance evaluation of the remedial system during the 2Q02 are presented below <br /> 3.1 Groundwater Extraction System <br /> The groundwater extraction system consists of groundwater extraction wells EX-1, EX-2 and <br /> EX-3 (Figure 5) These wells are equipped with submersible pumps connected through <br /> mechanical piping to a series of granular activated carbon (GAC) vessels prior to an <br /> industrial sewer discharge point Chevron discharges treated groundwater at the subject site <br /> under City of Lodi Wastewater Discharge Permit #310 Pumping through the wells from <br /> areas affected by petroleum hydrocarbons prevents migration of these hydrocarbons off-site <br /> To assess effectiveness of the GWE system, process samples were collected weekly during <br /> this reporting period Sample locations include an influent port (INFL), prior to the first <br /> GAC vessel, between the first and second GAC vessels (MID-1), between the second and <br /> third GAC vessels (MID-2), and prior to discharge (EFFL) to the industrial sewer During <br /> these sampling events, INFL, MID-1, MID-2, and EFFL samples were analyzed for TPHg, <br /> benzene, BTEX compounds, MtBE, TBA, DIPE, ELBE, TAME, ethanol, methanol, EDB, and <br /> 1,2-DCA Maximum concentrations of detected constituents are presented below Current <br /> and historical analytical information is presented as Table 3 <br /> 11Chevron19577Wenodic Monitortng\Quarterly Progress Reports1200212nd Quarter-2002 Progress Report doe <br />