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_. . z , 404 WEST TREMONT STREET WKA No. 1628.09. „L June 15,2000 Page 2 s_ = the wells were sampled in order of increasing concentration based on previous sampling results. -All water removed during sampling and purging operations was placed in sealed and labeled 55- _ gallon drums and stored on site. ,Analysis of water samples MW2, MW6, and MW7 revealed no detectable concentrations of TPH as-gasoline,-BTEX, or oxygenates. Concentrations of.TPH as gasoline were detected in the water samples obtained from wells MW1, MW4 and MW5-at- _ _concentrations of 220 µg/l, 13,000 µg/1, and 1,400 µg/1,respectively. Benzene was detected in- MW4 and MW5 at concentration of 1;200 µg/1.and 280 µg11, respectively. Review of historic = - ` —.data reveals no specific trendwithregard to TPH as gasoline concentrations in wells MW-4-and -' MWS.-Concentrations of TPH.as gasoline in.well MWi have slightly decreased but remain 7. :- . sporadic in wells MW4:and MW5.._MTBE was only,detected in wells MW 1 (2.1 µ911)and MW3 -(0.99 µg/1):-; A summary of analytical results for groundwater samples obtained from the M onitoring wells is included as-Table-2: Complete.analytical reports and chain-of-custody` `4. I documentation are included in the appendix.:.--, - . . - .� y The next quarter of groundwater monitoring-and sampling is.scheduled for August 2000. O report for next quarter will be transmitted upon completion of laboratory testing. _ Wallace-:Kuhl &:Associate , nc. - - - (pNL LASS er It - • - 6152 = - y �• -- Kurt alasek - c _ - :HYDROGEOLOGLST- Yi . # -Seni r.Hydrogeologist r 44 g :EH:sdm- opy to.=Mr. Jeffrey C.F. Wong, San Joaquin County PHS ^= - HT"t:'31MI1628-)9.gt6ZL _ - - - m Al - - M — - WALLACE•KUHL Rec ded paper �F s' g— - — — — - " Er ASSOCIATES INC.