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' Boyett Petroleum April 10, 2001 <br /> 419 Main Street, Manteca, CA <br /> Quarterly Groundwater Sampling Report <br /> March, 2001 <br />' Summary of Analytical Findings <br />' This quarter, detectable contamination levels were identified in the monitoring wells listed <br /> below: <br /> Well TPH- B I T E X MTBE ETH BTA DIPE ETBE TAME EDB 1,2- <br /> Gas* DCA <br /> MW-1 0 d7 ND ND ND ND 16000 ND ND ND ND 5 ND ND <br /> MW-2 <br /> US ND 11.9 ND ND ND ND ND ND ND ND <br /> MW-3 ND ND ND ND ND ;1:::;:':;2911:> ND ND ND ND ND ND ND <br /> MW-4 0Q6 ND LS d 8 .: ND ND ND ND ND ND ND <br /> MW-5 ;:;:.fl,4.7...:; , ....:;:ah ...:..> ...:::;:.. . ..:::: ND ND ND ND ND ND ND ND <br /> MWS ND 0. ;.: , ND =.Q.$,., 0.7 ND ND ND ND ND ND ND ND <br /> MW-7 ND ND ND <€0, _ 0.S ND ND ND ND ND ND ND <br /> MW-8 ND ND ND 1.1 0.8 ND ND ND ND ND ND ND ND <br /> BTEX—Benzene,Toluene,Ethyl Benzene,Xylenes <br /> MTBE—Methyl TertButyl Ether <br /> ETH—Ethanol <br /> BTA—Tert-Butanol <br /> ' . DIPE—Di-Isopropyl Ether <br /> ETBE—Ethyl TertButyl 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 /> ' MW-1 contained 16,000 ug/L of MTBE, an increase from last quarter's sampling event, in <br /> December, 2000, in which MW-1 had a concentration of 8,800 ug/L. MW-2 showed a <br /> decrease in all analytes tested for, including MTBE, which was"none-detected". The only <br /> ' chemical present in MW-3 this quarter was MTBE at a concentration of 290 ug/L, an <br /> increase since last quarter from 130 ug/L. MW-4 showed decreases for all analytes tested. <br /> The concentrations of the chemical present in MW-5 are relatively the same since last <br /> ' quarter. MTBE was "none-detected" (ND) in MW-5. MW-6 had a decrease in the <br /> concentration of MTBE this quarter from 4.5 to ND. All other analytes in the water <br /> sample from MW-6 were relatively similar to the concentrations from last quarter. MW-7 <br /> ' showed a decrease in all chemicals since last quarter, most notably was the decrease in <br /> MTBE from 1,000 to 2.2 ug/L. The levels of contamination in MW-8 is consistent with <br /> the last monitorincy event in December_ 2000_ Past analvtical data are listed in Table 2 for <br /> ' comparison. Appendix A contains the laboratory analytical data and Chain of Custody <br /> report. <br /> 1 <br /> 2 <br />