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Boyett Petroleum October 13, 2001 <br /> 419 Main Street, Manteca, CA <br /> Quarterly Groundwater Sampling Report <br /> September, 2001 <br /> 1 Summary of Analytical Findings <br /> This quarter, detectable contamination levels were identified in the monitoring wells <br /> listed below: <br /> Well TPH- B T E X MTBE ETH BTA DIPE ETBE TAME EDB 1,2- <br /> Gas* DCA <br /> MW-1 0.28 ND ND ND ND 23,000 ND ND ND ND ND ND ND <br /> MW-2 0.63 37 19 53 90 ND ND ND ND ND ND ND ND <br />' MW-3 ND ND ND ND ND ND ND ND ND ND ND ND ND <br /> MW-4 0.18 5.5 4.0 14 24 47 ND ND ND ND ND ND ND <br /> MW- -- -- -- -- -- -- -- -- -- -- -- -- -- <br /> 5** <br /> MW-6 ND ND ND ND ND 0.6 ND ND ND ND ND ND ND <br /> MW-7 ND ND ND ND ND 20,000 ND ND ND ND ND ND ND <br /> MW-8 ND 0.5 0.6 1 1.8 3.4 4.9 1 ND ND ND ND ND ND ND <br /> MW-9 0.24 5.4 5.7 1 17 30 ND ND ND ND ND ND ND ND <br /> BTEX—Benzene, Toluene,Ethyl Benzene,Xylenes <br /> MTBE—Methyl Tert-Butyl Ether <br />' ETH—Ethanol <br /> BTA—Tert-Butanol <br /> DIPE—Di-Isopropyl Ether <br /> e ETBE—Ethyl Tert-Butyl Ether <br /> TAME—Tert-Amyl Methyl Ether <br /> EDB—Ethylene Dibromide <br /> 1,2-DCA— 1,2-Dichloroethane <br />' ND-"None detected"at or above reporting limit <br /> *Reported in mg/L. All other analytes reported in ug/L <br /> **No water in Well—unable to sample <br />' MW-1 contained 23,000 ug/L of MTBE, an slight decrease from last quarter's sampling <br /> event, to June, 2001, in which MW-1 had a concentration of 27,000 ug/L. MW-2, <br />' showed an increase in all tested analytes. MW-3 was "ND" for all constituents. MW-4 <br /> had an increase in all analytes, except for MTBE which decreased from 130 to 47 ug/L. <br /> MW-6 only had 0.6 ug/L of MTBE. MW-7 had a significant increase in the <br /> concentration of MTBE from 8,300 to 20,000 ug/L. MW-8 showed slight increases in all <br /> chemicals since last quarter. MW-9 had increases in all chemicals except for MTBE <br /> which slightly decreased from 15 ug/L to "ND". Past analytical data are listed in Table 2 <br />' for comparison. Appendix A contains the laboratory analytical data and Chain of <br /> Custody report. <br />' The monitoring wells will be measured, purged and sampled again next quarter, and a <br /> new gradient calculated. <br />' 2 <br />