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f$ <br /> Y <br /> I j G R O L' V 1) 11 A T Ii R <br /> ti 10 R L N1 I: D 1 A T 1 0 N j <br /> S l: K V I C: E 5 �� <br /> Barley MJ1 Plaza.Wilminolon,DF 19898 <br /> December 14, 1987 <br /> Mr. Michael Hansen <br /> Kayo Oil Company <br /> 900 S. Cherokee Lane <br /> Lodi , CA 95240 <br /> Dear Mr. Hansen: <br /> We have just received the chemical analyses of water from the <br /> wells installed in the most recent phase of contamination assessment <br /> at 800 E Hwy. 12, Lodi , CA. A copy of the analysis results is <br /> attached. Three of the exter:fior wells (MW 22, MW-23, and MW-30) <br /> showed detectable benzene in `solution. Additional work will be needed <br /> to finish the contamination assessment. <br /> I recommend that two more wells be drilled at this time, and that <br /> we plan another phase of drilling beyond that as a contingency. If we <br /> obtain regulatory approval for both planne phases at this time, then <br /> we can avoid delay if the second phase is necessary. <br /> I, <br /> Well MW-22 had only 10 ppb benzene anc only 80 ppb TVH in its <br /> water. I recommend that we should simply ontinue to monitor it, and <br /> not step out in that direction for another well . Other wells at Lodi <br /> with similar initial contaminant concentrations (MW-11, MW-12) have <br /> cleaned up over time to ND benzene. <br /> I recommend that we step!Jout and drill wells beyond MW-23 and <br /> MW-30. MW-23 water contained 89 ppb benzene, and MW-30 water <br /> contained 800 ppb benzene. The proposed w ll locations are shown on Y. <br /> the attached map as MW-32P and MW-33P. Each well would be 50-55' <br /> deep, and installed with a 15� screen at the appropriate depth to <br /> allow observation and sampling of the watey table aquifer. Soil <br /> samples will be collected foranalysis at ppropriate depths during <br /> drilling. Water samples will'lbe collected for analysis after the <br /> wells are developed. The installation of ill wells will be supervised <br /> by a California registered geologist. The same protocols and <br /> techniques would be followed `as in our initial characterization <br /> proposal . We propose to continue using thf same subcontractors. <br /> Ifroundwater contamination is found to extend beyond the tw <br /> 9 Y o <br /> wells proposed above or if benzene levels in MW-22 increase <br />€ significantly, I would like to have a contingency plan in place for <br /> aUPON <br /> ;k <br />