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M. Scott Mansholt 2 - 21 November 2007 <br /> Chevron-Former Lyoth Loao g Station <br /> • Depth to water, between 13 and 17 feet (elevation — 60.5 to 61.6-feet) with a north- <br /> northeast gradient and are consistent with prior information. <br /> SAIC recommended the following: <br /> • Inspect/replace the MW-2 oleophilic sock at the same time annual groundwater <br /> monitoring and sampling are conducted; return the well to sampling once the TPH <br /> sheen has been removed; and, <br /> • Since only low concentrations for part of the PAH constituents at or slightly over <br /> respective MDLs are detected, discontinue PAH analysis. <br /> Based on our review we have the following comments: <br /> • Information regarding oleophilic sock change out should be documented in the table <br /> describing separate phase product removal; and, <br /> • At any time a site(s) where groundwater monitoring is conducted and problems arise <br /> that prohibit access/sampling, the issues must be addressed immediately so samples <br /> are obtained for that event. <br /> Regional Water Board staff concurs with the changes recommend in SAIC's report provided <br /> our comments outlined above are addressed. <br /> If you have any questions or comments, please contact Dean Hubbard at (559) 445-5179. <br /> _4�)' e a,�a, qk� <br /> SHELTON R. GRAY X C. DEAN HUBBARD <br /> Senior Engineering Geologist v Engineering Geologist <br /> P.G. No. 6357 <br /> cc: Harlan Knoll Michael, San Joaquin County EHD, Stockton <br /> Mike Jenkins, SAIC, Sacramento <br /> Lee Higgins, SAIC, San Ramon <br /> Jeffrey J. Scharff, Sacramento <br /> CDH1MCommon0VP\Lyoth5ta2007 annul revu,Nov 2007 <br />