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PUBLIC HEALTH SERVICES <br /> SAN JOAQUIN COUNTY <br /> ENVIRONMENTAL HEALTH DIVISION H A <br /> Ernest M. Fujimoto, M. D., M.P.H., Acting Health Officer `• <br /> 304 East Weber Avenue, Third Floor • Stockton, CA 95202 `a<<=oR�'•r <br /> 2091468-3420C �� <br /> i <br /> JOHN & MARGARET MARCI APR <br /> MARCIS DIESEL SERVICE r4 <br /> 2973 LOOMIS ROAD <br /> STOCKTON CA 95205 <br /> RE: 2969 Loomis Road SITE CODE: 2015 <br /> Stockton, CA <br /> San Joaquin County Public Health Services, Environmental Health Division <br /> (PHS/EHD) has reviewed the letter dated April 3, 1997 and the work plan dated <br /> April 1997 prepared by William J. Hunter & Associates for the above referenced <br /> site, <br /> The area of the county where this site is located has water provided by private <br /> wells and first water is drinking water. For future land use decisions, the extent <br /> of the petroleum hydrocarbon contamination must be determined. <br /> Although the gradient at this site is divergent, groundwater flow has been to the <br /> southwest most often and there is not a monitoring well in that direction. <br /> Furthermore, monitoring well #1 is not screened at or above first water so water <br /> samples collected from this well may not be representative of first water level <br /> quality. As groundwater has risen, TPH-diesel has been evidenced in monitoring <br /> well #1 even though its screened interval is below first water. <br /> The additional information required to delineate the lateral and vertical extent of <br /> contamination at this site can be obtained by the installation of a 2 inch <br /> monitoring well using an 8 inch outside diameter hollow stem auger on the drill <br /> rig: The cost of this smaller well and boring including time and materials should <br /> be less than the 4 inch monitoring well proposed. Therefore, PHS/EHD <br /> approves of the installation of a 2 inch diameter monitoring well in an 8 inch <br /> diameter boring. <br /> Soil samples should be collected every 5 feet or with change in the lithology. An <br /> organic vapor detector (PID or FID) must be utilized during this field work. Soil <br /> samples to be analyzed will be determined by PHS/EHD staff and the consultant, <br /> based on field observations and former information obtained at the site. <br /> The work plan does not address the storage of soil cuttings generated during the <br /> drilling. Soil cuttings must be placed on an impermeable surface and covered or <br /> properly containerized until proper disposal has been decided. <br /> A Division of San Joaquin County Health Care Services <br /> RECEIVED <br />