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Z <br /> Scott Mansholt -2 - 13 April 2005 <br /> ChevronTexaco <br /> Mountain House Sites#4 and#5 <br /> The workplan proposes the installation of five borings and up to four additional "step out"borings at <br /> each site to collect soil and groundwater samples for laboratory analysis to delineate the lateral and <br /> vertical extent of petroleum hydrocarbon constituents. <br /> Based on our review, we have the following comments: <br /> • SAIC, ChevronTexaco and Regional Board staff, to expedite the characterization process during <br /> the course of the investigation work, will review the results of analysis and field observations to <br /> determine the need and/or location(s) for additional borings and corresponding sampling; and, <br /> • A well survey should be conducted to obtain information of groundwater production wells used <br /> for municipal, domestic, agriculture, industrial, and/or other uses within 2,000 feet of the project. <br /> We concur with the 31 March 2005 workplan for the Mountain House Sites #4 and#5 provided our <br /> comments outlined above are addressed. Please notify Regional Board staff at least 48 hours prior to <br /> initiating field drilling activities. <br /> If you have any questions or comments, please contact Dean Hubbard at (559) 445-5179. <br /> �r <br /> SHELTON R. GRAY C. DEAN HUBBARD <br /> Senior Engineering Geologist Engineering Geologist <br /> RG No. 6357 <br /> cc: Mike Infurna, San Joaquin County Public Health Services, Stockton <br /> Luis Mercado, SAIC, Sacramento <br />