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Boyett Petroleum June 15, 2001 419 Main Street,Manteca, CA Quarterly Groundwater Sampling Report • June, 2001 ' Summary of Analytical Findings This quarter, detectable contamination levels were identified in the monitoring wells listed below: 1 Well TPH- B T E X MTBE ETH BTA DIPE ETBE TAME EDB 1,2- Gas* DCA ' MW-I ND ND ND ND ND 27,000 ND ND ND ND 100 ND ND MW-2 ND ND ND ND ND ND ND ND ND ND ND ND ND ' MW-3 ND ND ND ND ND 3.3 ND ND ND ND ND ND ND MW-4 ND ND ND ND ND 130 ND ND ND ND ND ND ND MW-5 0.05 1.4 ND 11 1.2 ND ND ND ND ND ND ND ND MW-6 ND ND ND ND ND ND ND ND ND ND ND ND ND ' MW-7 ND ND ND ND ND 8,300 ND 90 ND ND 36 ND ND MW-8 ND ND ND ND ND ND ND ND ND ND ND ND ND MW-9 ND I ND ND ND ND 15 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 ND-"None detected"at or above reporting limit ' *Reported in mg/L. All other analytes reported in ug/L MW-1 contained 27,000 ug/L of MTBE, an increase from last quarter's sampling event, in March, 2001, in which MW-1 had a concentration of 16,000 ug/L. MW-2, MW-3, MW-5, MW-6, and MW-8 showed a decrease in all tested analytes. MW4 had an ' increase in MTBE from 83 to 130 ug/L but all other chemicals decreased in concentration to ND. The only chemical present in the water sample collected from MW-9 was MTBE at 15 ug/L. The concentrations of the chemicals MTBE, BTA, and ' TAME increased significantly since last quarter. 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 nPw aradiPnt nArnlated