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S E C O R Second Quarter 2003, Quarterly Progress Report July 14, 2003 Page 1 1.0 INTRODUCTION SECOR International, Incorporated (SECOR), on behalf of Chevron Environmental Management Company (Chevron), presents second quarter 2003 (2Q03) groundwater monitoring and sampling results, and operational data for the groundwater extraction (GWE) and soil vapor extraction (SVE) systems at 301 West Kettleman Lane, Lodi, California (Figure 1). This report covers the period from March 18, 2003 through June 18, 2003, and was prepared in accordance with Cleanup and Abatement Order (CAO) No. 5-00-704, dated April 20, 2000 (Attachment A). 2.0 GROUNDWATER MONITORING AND SAMPLING On April 28, 2003, Gettler-Ryan Incorporated (G -R), conducted 2003 groundwater monitoring and sampling. Certified laboratory analytical reports, and chain -of -custody documentation, and 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 Monitoring well gauge data indicates the approximate depth to groundwater in A, B, and C -zones ranges from 56.26 to 58.89 feet below ground surface (bgs). Groundwater gauging data is presented as 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 flows to the southeast, with an approximate hydraulic gradient of 0.019 to 0.029 feet per feet (ft/ft) (Figure 3). 2.2 Sample Analytical Results e. 3 During the 2003 event groundwater samples were analyzed for total petroleum hydrocarbons as gasoline i,. TPH 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. lAChevron1957751Periodlc Monitoring\Quarterly Progress Reports1200312nd Quarter -2003 QPR.doc i Maximum Constituent Concentrations (µg11) Zane Ethyl- TPHg Benzene Toluene Xylenes MtBE TBA EtBE TAME benzene A <50 <0.5 <0.50 <0.50 <0.50 15 <5 <0.50 <0.50 zone B <50 <0.50 <0.50 <0.50 <0.50 <0.5 <5 <0.5 <0.50 zone C <50 <0.50 <0.50 <0.50 <0.50 <0.5 <5 <0.50 <0.50 zone Explanations. µgA = Micrograms per liter < Indicates the constituent was not present at or above the method detection limit shown lAChevron1957751Periodlc Monitoring\Quarterly Progress Reports1200312nd Quarter -2003 QPR.doc i