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PUBLIC HEALTH SERVICES quf . <br /> SAN JOAQUIN COUNTY r <br /> ENVIRONMENTAL HEALTH DIVISION <br /> Ernest M. Fujimoto, M.D., M.P.H., Acting Health Officer <br /> 445 N. San Joaquin Street # P. O. Box 388 • Stockton, CA 95201-0388 <br /> PAMELA LOPEZ 209/468-3420 LED JUN 14 1995 <br /> PO BOX 393 <br /> THORNTON CA 95686 <br /> Re: Lopez Property Site Code: 1930 <br /> 26500 Nowell Road <br /> Thornton CA <br /> San Joaquin County Public Health Services, Environmental Health Division (PHS/EHD) has <br /> completed review of the "Workplan -Soil and Groundwater Investigation" dated May 17, 1995 and <br /> prepared by BSK. PHS/EHD has the following comments for your consideration. <br /> The work plan proposed to drill five soil borings to a depth of 20 feet. PHS/EHD agrees that <br /> additional soil investigation is necessary to determine the vertical and horizontal extent of the soil <br /> contamination documented during the 1989 tank removal and subsequent limited November 1994 <br /> investigation. Please be aware that significant soil contamination was detected at 20 feet below <br /> grade suggesting that soil borings to a greater depth will be necessary to determine the vertical extent <br /> of soil contamination. Also, it is likely that greater than two soil samples should be submitted per <br /> borings to characterize the subsurface environment. Prior to laboratory submittal, contact PHS/EHD <br /> to discuss which soil samples are proposed to undergo analysis. <br /> Groundwater contamination has already been indicated and in order to reduce costs associated with <br /> an additional mobilization effort, monitoring wells should be installed in conjunction with the <br /> proposed borings. In fact, one or more of the proposed borings could be converted into monitoring <br /> wells. Once monitoring wells are installed, PHS/EHD recommends that a licensed surveyor be used <br /> to determine the elevation of the top of casing. <br /> Please note that the site plan included in the work plan located MW6 on the Lopez property when <br /> in fact it is outside of the Lopez property fence and located on Tri-Valley property. <br /> Please submit an addendum addressing PHS/EHD comments by July 5, 1995 and a permit <br /> application with $89 fee. Once approval is granted, PHS/EHD will issue a drilling permit. <br /> If you have any questions or comments, please contact Mary Meays at (209) 468-0337. <br /> Donna Heran, Director, REHS <br /> Environmental Health Division <br /> m <br /> Mary Meays, Senior REHS Diane M. Hinson, REHS <br /> Site Mitigation Unit Supervisor <br /> MM/26500NO/A <br /> cc: Elizabeth Thayer, CVRWQCB <br /> cc: Richard Johnson, BSK <br /> A Division of San Joaquin County Health Care Services <br />