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Scott Mansholt <br /> ChevronTexaco 2 - 5 August 2003 <br /> Mountain House Site#3 <br /> The workplan proposes the installation of at least seven borings and up to five additional "step out" <br /> borings to collect soil and groundwater samples for laboratory analysis to delineate the lateral and <br /> vertical extent of TPH near borings GP-96, GP 97, GP 117, GP 120, and GP 173. <br /> ChevronTexaco and Regional Board staff, to expedite the characterization process during the course of <br /> the investigation work, will review the results of analysis and field observations to determine the need <br /> for additional borings and sampling. <br /> Based on our review of our records and the workplan, we have the following comments: <br /> • PreIiminary results that elevated concentrations of petroleum hydrocarbons are present in soil <br /> and free hase etroleum in roundwater warrant remediation upon com letion of defining the <br /> latera] boundaries of the o]Iution a remedial action an and time schedule should be prepared <br /> and included with the report; and, <br /> ChevronTexaco needs to perform a search and survey of all production wells used for <br /> municipal, domestic, agriculture, industrial, and other uses within 2,000 feet of the Mountain <br /> House properties. <br /> We concur with the workplan provided our comments described above are addressed. <br /> By 2 September 2403, please submit your plan and time schedule for conducting the scope of work <br /> described in the workplan and the additional activities outlined above. PIease notify Regional Board <br /> staff at Ieast 48 hours prior to commencing the field investigation and drilling activities. <br /> If you have any questions of comments,please contact Dean Hubbard at (559) 445-5179. <br /> 1 <br /> v <br /> SHELTON R. GR Y <br /> Senior Engineering Geologist C. DEAN HUBBARD <br /> Associate Engineering Geologist <br /> RG No. 5357 <br /> cc: Mr. Mike Infurna, San Joaquin County Public Health Services, Stockton <br /> Mr. Stan Ploof, Trimark Communities, Tracy <br /> Mr. Garrett Turner, SAIC, Oakland <br /> Mr. Gary Foote, Geomatrix, Oakland <br />