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r S <br /> PUBLIC HEALTH SERVICES ,op4U!N"CO <br /> SAN JOAQUIN COUNTY ' y� <br /> JOG[KHANNA M.D.,M.P.H. <br /> Health Officer P.• <br /> P.O. Box 2009 • (1601 East Hazelton Avenue) • Stockton,California 95201 <t Fon,a <br /> (209) 468-3400 <br /> October 8 , 1990 <br /> Copy <br /> Jim Gillies <br /> Gillies Trucking Co. <br /> P.O. Box 8303 <br /> Stockton, CA 95208 <br /> RE: Gillies Trucking Co. IN REPLY REFER TO SITE CODE: 1703 <br /> 3931 Newton Rd. <br /> Stockton, CA <br /> Review completed of: "Report of Preliminary Soil Sampling and Tank <br /> Removal" dated September 6, 1990. <br /> We have completed our review of the above referenced document. <br /> The proposed work plan suggests a single monitoring well and one <br /> soil boring to approximately 60 feet below grade. Your consultant <br /> plans to utilize nearby private wells and local municipal <br /> information to judge placement of the monitoring well in a <br /> downgradient location. The data used for this placement must <br /> include information concerning the depth to first groundwater <br /> during wet seasons in the past 10 years, specifically 1983 and <br /> 1986. <br /> The drilling methods discussed in the proposal are hollow stem <br /> auger or a modified rotary/split spoon sampling system. The <br /> modified rotary/split spoon system design and technique must be <br /> submitted for evaluation, prior to the start of drilling. The <br /> drilling technique selected should be one which will avoid or <br /> minimize the introduction of fluids into the subsurface formations <br /> being investigated. Additionally, precautions must be taken when <br /> using drilling muds to prevent cross contamination through the <br /> fluid introduction. Details of the drilling mud solids, which <br /> should contain little or no polymers, should be included in your <br /> report. <br /> Short-screened (1-5 feet) intervals of water table elevations are <br /> best determined utilizing piezometers or two inch diameter PVC <br /> casing which define a plane using a three or four data point <br /> problem solution. In the event site specific gradient cannot be <br /> determined with the single monitoring well, additional wells will <br /> be necessary to accomplish planar definition. <br /> A Division of San Joaquin County Health Care Services 40 <br />