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F��, S IEC0R -- - Third Quarter 2003, Quarterly Progress Report October 14, 2003 Page 1 1.0 INTRODUCTION SECOR International, Incorporated (SECOR), on behalf of Chevron Environmental Management F Company (Chevron), presents third quarter 2003 (3003) groundwater monitoring and sampling results, and operational data for the groundwater extraction (GW E) and soil vapor extraction (SVE) systems at 301 West Kettleman Lane, Lodi, California (Figure 1). This report covers the period from June 18 through F. September 16, 2003, and was prepared in accordance with Cleanup and Abatement Order (CAO) No. 5- 00-704, dated April 20, 2000 (Appendix A). F 2A GROUNDWATER MONITORING AND SAMPLING On July 28 & 29, 2003, Gettler-Ryan Incorporated (G -R), conducted 3003 groundwater monitoring and sampling. Certified laboratory analytical reports and chain -of -custody documentation, and Gettler Ryan's f monitoring and sampling field data sheets, are included in Appendices B and C, respectively. A brief description is presented below. 2.1 Monitoring Well Gauge Data k w+ n r f Monitoring well gauge data indicates the approximate depth to groundwater in A, B, and C -zones ranges from 58.95 to 62.27 feet below ground surface (bgs). Groundwater gauging data is presented in Table 1. Groundwater in the A -zone near the site appears to flow radially toward extraction well EX -3 (Figure 2). Groundwater in the B -zone appears to be variable but flowing mainly to low areas to the northeast and south (Figure 3). 2.2 Sample Analytical Results During the 3Q03 event, groundwater samples were analyzed for total petroleum hydrocarbons as gasoline (TPHg), benzene, toluene, ethyl -benzene, and total xylenes (BTEX), methyl tertiary butyl ether (MtBE), tertiary butyl alcohol (TBA), di -isopropyl ether (DIPE), ethyl tertiary butyl ether (EtBE), tertiary amyl methyl ether (TAME), ethanol, methanol, ethylene di -bromide (EDB), and 1,2-dichloroethane (1,2 - DCA). Sample analytical results are presented. as Table 2. Maximum concentrations of detected constituents for A, B, and C -zones are presented in the table below. An A -zone isoconcentration map for MtBE is presented as Figure 4. lAChevron1957751Periodic Monitoring\Q P R\200313rd Quarter -2003 QPR.doc Maximum Constituent Concentrations (ggll) Zone TPHg Benzene Toluene Ethyl_ Xylenes MtBE TBA EtBE TAME benzene A 350 <0.5 0.7 <0.5 <0.5 2,500 16 240 19 zone B- <50 <0.5 <0.5 <0.5 <0.5 1 9 <0.5 <0.5 zone C- <50 <0.5 <0.5 <0.5 <0.5 <0.5 <5 <0.5 <0.5 zone Explanations: µg11 = Micrograms per liter Indicates the constituent was not present at or above the method detection limit shown lAChevron1957751Periodic Monitoring\Q P R\200313rd Quarter -2003 QPR.doc