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PUBLIC HEALTH SERVICES <br /> ApUI� <br /> SAN JOAQUIN COUNTY <br /> ENVIRONMENTAL HEALTH DIVISION H s <br /> Ernest M. Fujimoto, M. D., M.PH., Acting Health Officer <br /> 304 East Weber Avenue, Third Floor • Stockton, CA 95202 C, * <br /> LlFpR� <br /> 209/468-3420 <br /> JOHN & MARGARET MARCI <br /> MARCIS DIESEL SERVICE <br /> �'� 1 a9 � <br /> 2973 LOOMIS ROAD <br /> STOCKTON CA 95205 <br />' RE 2969 Loomis Road <br /> 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 /> rade <br /> Although the <br /> g 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 ,%-'K ;�31 <br />