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Mr Travis Bryant Project No 2002-1426-01 . February 25, 2000 Page 3 Groundwater samples were analyzed for total petroleum hydrocarbons-purgeable (TPHP) and extractable (TPHE), and volatile organic compounds as gasoline, benzene, toluene, ethylbenzene, and xylenes, as well as five oxygenates (MTBE, TAME, TBA, DIPS, and ETBE), using EPA Method 8015B/DHS LUFT and EPA Method 8260B Historical and fourth quarter 1999 groundwater analytical data are summarized in Table 1 Certified analytical reports and chain-of-custody records are included in Appendix C Petroleum hydrocarbons were detected in the samples collected from the monitoring wells Total petroleum hydrocarbons-purgeable were detected in MW-1 at 60 ug/I and in MW-2 at 130 ug/1 Benzene, total petroleum hydrocarbons—extractable, and oxygenates, with the exception of tertiary butyl alcohol (17 ug/1), were reported below method detection limit CONCLUSIONS Low concentrations of petroleum hydrocarbons were detected in the monitoring wells during the fourth quarter 1999 sampling event Petroleum hydrocarbon concentrations have declined since the initial sampling event performed in March 1997 Benzene concentrations have declined to non-detectable levels and concentrations of total • petroleum hydrocarbons as gasoline have also declined The next sampling event is scheduled for the first quarter of 2000 If you have any questions, please call Jay Johnson at (530) 295 1992 Sincerely Stra s ay son R G Pr lect Manager Attachments Table 1 Groundwater Monitoring Data Table 2 Groundwater Analytical Results for Oxygenates Figure 1 Site Plan and Analytical Summary Figure 2 Groundwater Elevation Contours, Fourth Quarter 1999 Appendix A Field Data Sheets Appendix B Sampling Procedures Appendix C Certified Analytical Reports and Chain-of-Custody Records for Groundwater Samples C Wy Documents\IBOStocktonAth qtr QMR doc Stratus