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' Boyett Petroleum March 14, 2002 419 Main Street, Manteca, CA ' Quarterly Groundwater Sampling Report • December, 2001 — Summary ofAnalytical 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 13,000 ND ND ND ND ND ND ND MW-2 ND ND 0.7 ND 0.9 4.1 ND ND ND ND ND ND ND ' MW-3 ND ND ND ND ND 9.6 ND ND ND ND ND ND ND MW-4 0.09 2.0 6.0 2.3 11 17 ND ND ND ND ND ND ND MW-5 0.11 5.0 9.9 33 15 ND ND ND ND ND ND ND ND MW-6 ND 0.4 0.7 0.4 1.9 20 ND ND ND ND ND ND ND ' MW-7 013 ND ND ND ND 26,500 ND ND ND ND ND ND ND MW-8 ND ND 0.4 ND ND ND ND ND ND ND ND ND ND MW-9 0.06 0.7 2.4 1.4 5.8 ND ND ND ND ND ND ND ND ' BTEX—Benzene,Toluene, Ethyl Benzene,Xylenes MTBE--Methyl Tert-Butyl Ether ETH—Ethanol ' BTA—Tert-Butanol DIPE—Di-Isopropyl Ether ETBE—Ethyl Tert-Butyl Ether TAME—Tert-Amyl Methyl Ether EDB—Ethylene Dibromide 1,2-DCA— 1,2-Dichloroethane NI-"None detectgd"at or above reporting limit ' *Reported in mg/I' All other analytes reported in ug/L MW-1 contained 13,000 ug/L of MTBE, an significant decrease from last quarter's ' sampling event, in June, 2001, in which MW-1 had a concentration of 23,000 ug/L. MW- 2, showed a decrease in all tested analytes. MW-3 was "NM" for all constituents except for MTBE at 9.6 ug/L. MW-4 showed decreases in all analytes. MW-6 had increases in ' contamination since last quarter's monitoring event. MW-7 had a significant increase in the concentration of MTBE from 20,000 to 26,500 ug/L. MW-8 showed decreases in all ' chemicals since last quarter. 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. 1 2