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Y <br /> PUBLIC HEALTH SERVICES uqj <br /> a <br /> SAN JOAQUIN COUNTY <br /> ENVIRONMENTAL HEALTH DIVISION ' X <br /> Karen Furst, M.D., M.P.H., Health Officer Y. <br /> 0.7 _ �P <br /> 304 East Weber Avenue, Third Floor • Stockton, CA 95 D fiaR�' <br /> 209/468-3420 (0 <br /> MR BRYANT STEVENS MAR 0 2 1998 <br /> COMPASS GROUP USA <br /> 2400 YORKMONT RD <br /> CHARLOTTE NC 28217 <br /> RE: Canteen Corporation Facility SITE CODE : 1727 <br /> 1500 Shaw Rd. <br /> Stockton, CA., 95205 <br /> San Joaquin County Public Health Services, Environmental Health Division <br /> (PHS-EHD) has reviewed the "Work Plan for Placing One Groundwater <br /> Monitoring Weil" dated February 11, 1998 as submitted by Applied Earth <br /> Sciences Inc to PHS-EHD on February 17, 1998 and has the following <br /> comments. <br /> Workplans for monitoring well installations are to include a diagram of the well's <br /> proposed construction and a verbal description of the construction details. The <br /> length of the casing's screened interval is very important and must be <br /> established before the workplan can be approved. Monitoring wells constructed <br /> in San Joaquin County are to have an approved bentonite-type seal placed <br /> between the filter pack (sand) and the cement grout. This interval is to be noted <br /> on the construction diagram and the specific material proposed should be <br /> described in the narrative. The method of placement of the grouting material <br /> was not mentioned in the workplan. Grout must be pumped through a "tremie" <br /> pipe or equivalent and the ratio between the potable water used and the Type II <br /> Portland cement are regulated. Please ensure that no less than five (5) gallons <br /> and no more than ten (10) gallons per ninety-four (94) pounds of cement are <br /> used. <br /> PHS-EHD will select which soil samples collected will be sent to a California <br /> Department of Health Services approved laboratory for analyses. A review of <br /> the San Joaquin County Flood Control Map indicates that the deepest recorded <br /> depth to first groundwater (90') occurred during Fall, 1979. The deepest soil <br /> samples collected to date for this site were from 71 feet below ground surface <br /> ('bgs) on May 24 & 25, '1993 for MW-1, 2, and 4. MW-3 had a 79' bgs soil <br /> sample taken and analyzed and reported to have TPH as Gasoline at 12 mg/kg <br /> and Benzene at 1,600 mglkg. Soil samples should be collected and analyzed <br /> from a continuous core from 70' bgs to 90' bgs. <br /> A Division of San Joaquin County Health Care Services <br />