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n <br /> e <br /> �_.,.,� Vii•#^' <br /> x -G <br /> i <br /> Re: Site assessment report <br /> San Joaquin Local Health District 260 S. Main Street, Manteca, CA <br /> r <br /> 5eotember 28, 1gg - Page 4 of 4� <br /> 'y <br /> F 5. A. Conclusions: <br /> It is my considered opinion that because of the close proximity in <br /> depth of the sidewall samples taken during re-excavation to the <br /> original bottom sample taken during routine tank removal and that <br /> no evidence of contamination was found at a depth of 14 feet directly <br /> under the original bottom sample, that the 77. and 110. mg/kg Total <br /> Extractable Petroleum Hydrocarbons was the result of a small amount <br /> of sluff or a small isolated pocket of hydrocarbon. This probably h. <br /> was a result of a small over #ill over time past. All samples from t <br /> re-excavation showed "Bone Detected" levels of all constituants of <br /> petroleum hydrocarbons, therefore, any small amount of contamination <br /> remaining in the backfill would pose no threat to any part of the <br /> these thoughts in mind, I do not believe, nor do <br /> environment. With <br /> I recommend any further soil remediation, aeration, or groundwater <br /> monitoring steps. <br /> Respectfully submitted, <br /> JIM T 'E OIL, INC. <br /> R"chard Thorpe <br /> President <br /> cc: Calif. Regional Plater Quality Board <br /> Claudio Dell'Eva <br />