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. Mr Travis Bryant November 2, 2001 Page 3 Project No 2002-1426-01 (DIPE), ethyl tertiary butyl ether (ETBE), and 1,2-dichloroethane (1,2-DCA) using USEPA Method 8260B Historical and third quarter 2001 groundwater analytical data are summarized in Tables 1 and 2 Certified analytical reports and chain-of-custody records are included in Appendix C TPHG was detected in the groundwater samples at concentrations of 0 052 mg/1 (MW-1) and 0 120 mg/l (MW-2) TBA was detected in the sample collected from well MW-2 at a concentration of 20 µg/1 BTEX, MTBE, ETBE, TAME, D1PE, and 1,2-DCA were not detected in the groundwater samples, consistent with previous monitoring events CONCLUSIONS Concentrations of petroleum hydrocarbons in the monitoring wells have decreased since groundwater monitoring was initiated in 1997 TPHG was detected in samples collected from wells MW-1 and MW-2 at concentrations dust above laboratory method detection limits TBA was detected in the sample collected from well MW-2 at a concentration of 20 µg/1 STATEMENT OF LIMITATIONS The services described in this report were performed consistent with generally accepted professional consulting principles and practices No other warranty, expressed or implied, is made These services were performed consistent with our agreement with our client This report is solely for the use and Information of our client unless otherwise noted Any reliance on this report by a third party is at such party's sole risk If you have any questions regarding this report, please call me at (530) 676-6000 V5V1 ENTAL, INC. Attachments Table 1 Groundwater Monitoring Data Table 2 Additional Groundwater Analytical Results Figure 1 Site Location Map Figure 2 Site Map Appendix A Field Data Sheets Appendix B Sampling Procedures Appendix C Certified Analytical Reports and Cham-of-Custody . Documentation cc Mr Samuel Savig, San Joaquin County Public Health Services P 1I B C1Stockton\Qrt1y1200I\1BC Stockton-3Q01 doc STRATUS