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' Boyett Petroleum October 23, 2002 419 Main Street, Manteca, CA Quarterly Groundwater Sampling Report September, 2002 Summary of Analytical Findings This quarter, detectable contamination levels were identified in the monitoring wells listed below: Well TPH- B T E X MTBE ETH BTA DIPE ETBE TAME EDB 1,2- Gas* DCA MW-1 ND ND ND ND ND 1,370 NA NA NA NA NA NA NA MW-2 ND ND ND ND ND 640 NA NA NA NA NA NA NA MW-3 ND ND ND NDND ND NA NA NA NA NA NA NA MW-5+ -- -- -- MW-6+ -- -- -- -- -- ' MW-7 ND ND ND ND ND 14,200 NA NA NA NA NA NA NA MW-8 ND ND ND ND ND ND NA NA NA NA NA NA NA MW-9 ND ND ND ND 0.9 ND NA NA NA NA NA NA NA ' BTEX—Benzene,Toluene, Ethyl Benzene,Xylenes MTBE—Methyl Tert-Butyl Ether ETH—Ethanol BTA—Tert-Butanol 10 DIPE—Di-Isopropyl Ether ETBE—Ethyl Tert-Butyl Ether ' TAME—Tert-Amyl Methyl Ether EDB—Ethylene Dibromide 1,2-DCA— 1,2-Dichloroethane ND-"None detected"at or above reporting limit *Reported in mg/L. All other analytes reported in ug/L +Insufficient water to sample 1 MW-1 contained 1,370 ug/L of MTBE, an significant decrease from last quarter's sampling event, in June, 2001, in which MW-1 had a concentration of 13,000 ug(L. MW- 2, showed an increase in MTBE since last quarter. MW-3 was "ND" for all constituents. ' MW-4, MW-5, and MW-6 were unable to be sampled due to insufficient water in the well. MW-7 had a significant decrease in the concentration of MTBE from 26,500 to 14,200 ug/L. MW-8 was ND for all analytes tested. MW-9 showed decreases in all chemicals. Past analytical data are listed in Table 2 for comparison. Appendix A contains the laboratory analytical data and Chain of Custody report. ' The monitoring wells will be measured, purged and sampled again next quarter, and a new gradient calculated. ' As discussed in a site meeting on April 25, 2001, it would appear that interim mitigation in the form of soil gas vapor extraction, etc. may be advisable. A meeting should be ' scheduled to discuss the options. ' 2