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Mr. Mike Hansen <br /> -2- <br /> - r <br /> 4 April 1988 <br /> been presents <br /> the absence of 'theebenzen'et , e presence of the TPH <br /> faster in flume. Benzene usuall plume and <br /> ground water" than most""other componentsy migrates <br /> gasoline -so having a" TPH plume larger than benzene of <br /> unusual` and needs to be ex 11 <br /> chromatograms P ained• Please plume is <br /> recent analysisofinterpretations provide <br /> I` and detectable TPH. wells with non-) from the most <br /> detectable benzene <br /> We have 'no objections' to wat x-samples being <br /> the fringe wells and analyzed for TPH b <br /> however. Y collected from <br /> the results may still be ambiguousA method 8270; <br /> . - Your a <br /> n ''plImping iseratidts have shown that ...aquifer response to <br /> rapid. however, the tests also <br /> aquifers can not be pumped at the rates suggested.showed that the <br /> Ota analysis and interpretation nee ggested' <br /> determine how many recove ds to be Proper <br /> . .remediate. site ,in a done to <br /> re wells, will be sufficient to <br /> to date.- su est to us thatone <br /> period of time. <br /> to controlgthe a recove Results <br /> Plumes of contamination-and lremediate the <br /> ient <br /> site in a timely manner. Also, statements in <br /> that ground water flow rates - Are low, each report <br /> inches per-day, suggest , at a maximum of 20 ' <br /> day is over boo feet <br /> the contrary to . us; as 20 inches per <br /> ; - per year! _ <br /> Please submit- the missing data <br /> as an ;addendum to each PAR b ' and the requested chromatograms, ` <br /> -be addressed, with y 8 April 1988. <br /> for each site which adequate dues Junesolutio &, 1'Final er points can <br /> ,in the Final Remedial Plan <br /> 1f you have, an • <br /> Y. questions, please call me at <br /> (916) 361-5731. <br /> GARY s. JOHNSON <br /> Engineering Geologist <br /> GSJ:gj <br /> cc: mss- Laurie Cotulla, San Joaquin <br /> StocktonLocal Health District, <br /> Mr. Dave Ellis, Groundwater Bio <br /> Wilmington, Delaware remediation Services, <br /> Mr. Kent Parrish, Exceltech, Fre ont <br />