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Scott Mansholt -2 - E31 July 2003 <br /> ChevronTexaco nt- Cc HEA! f 1 <br /> Mountain House Site#1 <br /> 03 AUG - t PH 1: 24 <br /> The workplan proposes the installation of six temporary borings to collect soil and groundwater samples <br /> for laboratory analysis to delineate the lateral and vertical extent of TPH near borings GP-33 and GP-79. <br /> ChevronTexaco and Regional Board staff, to expedite the characterization process during the course of <br /> the investigation work, will review the results of analyses and field observations to determine the need <br /> for additional borings and sampling. <br /> Based on a review of our records and the workplan, we have the following comments: <br /> • The location of proposed boring MH 1-4 should be moved closer to boring GP-79, which <br /> contained elevated concentrations of TPH compounds in soil and groundwater; and, <br /> • ChevronTexaco needs to perform a survey of all production wells used for municipal, domestic, <br /> agriculture, industrial, and other uses within 2,000 feet of the Mountain House properties. <br /> We concur with the workplan provided our comments described above are addressed. <br /> By 22 August 2003, please submit your pl-aa-and time schedule for conducting the scope of work <br /> described in the workplan and the additional activities outlined above. Please notify Regional Board <br /> staff at least 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 /> SHELTON R. GRAY C. DEAN HUBBARD <br /> Senior Engineering Geologist Associate Engineering Geologist <br /> RG No. 6357 <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 />