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PUBLIC HEALTH SERVICES <br /> SAN JOAQUIN COUNTY <br /> ENVIRONMENTAL HEALTH DMSION <br /> Karen Furst, M.D., M.P.H., Health Officer .. ' <br /> ILE P <br /> 304 East Weber Avenue, Third Floor • Stockton, CAfCOPY " 7F <br /> 2091468-3420 <br /> AUG 0 5 10 <br /> DOROTHY SANDBERG LOUISE DEMARTINI <br /> 1901 E YOSEMITE ## 72 9269 N JACK TONE RD <br /> MANTECA CA 95336 STOCKTON CA 95215 <br /> RE: Sandberg Property SITE CODE: 2528 <br /> 4950 Bonham <br /> Linden, CA <br /> San Joaquin County Public Health Services, Environmental Health Division <br /> (PHS/EHD) has reviewed the "Proposed Work Plan For A UST Site Evaluation" <br /> dated July 28 1998, prepared by Tetra Tech EM Inc. for the above referenced <br /> site. <br /> A site map showing the location of the former underground storage tanks (UST) <br /> and piping, adjacent streets and buildings, underground utility lines and <br /> proposed boring locations was not provided in the work plan. Submit the site <br /> map to PHS/EHD so the boring locations can be evaluated. <br /> The use of a organic vapor screening tool (PID or FID) was not discussed in the <br /> work plan. An organic vapor screening tool must be available for use during this <br /> investigation. Soil samples to be analyzed by the laboratory will be selected <br /> based on the organic vapor screening tool readings and field personnel <br /> (PHS/EHD and consultant) observations. <br /> The vertical depth of the contamination near the location of the former UST <br /> system should be determined first. The drilling contractor should be prepared to <br /> drill to 110 feet below surface grade if required to determine the vertical depth. <br /> Drilling should continue until field observations and organic vapor screening tool <br /> readings indicate that there is two consecutive five feet intervals of non <br /> contaminated soil. The second and third borings should be placed in locations to <br /> show the lateral extent of the contamination, to a vertical depth of at least the <br /> same depth of the first boring. <br /> Destruction of borings must be by a cement or bentonite grout mixture. Submit <br /> a PHS/EHD permit application and $89 permit fee for the borings. The work <br /> must be performed by a well driller with a C57 license and the permit will be <br /> issued to the C57 licensed driller. Once the permit has been issued, the work <br /> can be scheduled with PHS/EHD staff so they may witness the investigation <br /> activities. <br /> A Division of San Joaquin County Health Care Services <br />