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�f <br /> Geofogicaf Technics Inc. <br /> 2601 River?{¢ad <br /> Modesto,CaCfomia 95351 <br /> (209)538-64241FaX#538-5852 <br /> May 25, 1993 <br /> Mr. Patrick Sherman <br /> E.F. Mitchler Company <br /> 400 South Lincoln, <br /> Stockton, California 95203 <br /> RE: Work Plan for Soil Boring Installation <br /> Lodi Ready Mix aiid Building Materials,'851 Ea iUdi Avenue, Lodi <br /> San Joaquin County Site Code 1359 <br /> t <br /> E Dear Mr. Sherman: <br /> In response to the letter from Ms. Laurie Cotulla of the San Joaquin County <br /> Public Health Services, dated April 15, 1993, Geological Technics Inc. has <br /> prepared the following Work Plan proposing the installation of a single soil <br /> boring to help determine if a groundwater investigation is warranted. <br /> Soil Boring Installation <br /> Geological Technics Inc. proposes to install one soil boring (SB-1) as near as <br /> F possible to where the soil sample identified as RE-BS - 25 feet was collected, <br /> (Figure 2). Note; we have not recieved a copy of to map showing the location <br /> of RE-BS - 25 soil sample yet, but will have a copy shortly for planning <br /> purposes. The soil boring will be drilled using a 7.25 outside diameter <br /> continuous flight hollow stem auger to a total depth to be determined but not <br /> to intercept the groundwater. Soil cuttings will be added to the current <br /> stockpile. Soil samples will be collected for geological and analytical <br /> evaluation at five foot intervals. Soil'samples will be collected in 6.0 inch <br /> brass liners using a 2.0 inch modified California split spoon sampler. All soil <br /> samples will be sealed with aluminum foil, capped; labeled and placed in a <br /> cooler at 4° Celsius for transport to the laboratory following Chain of Custody <br /> protocol. <br /> SB-1 will be closed as follows: after the last soil sample has been collected the <br /> augers will be lifted 3 feet and 50 pounds of bentonite will be poured through <br /> the hollow stem of the augers and hydrated with clean tap water. A tremie <br /> pipe of sufficient length to reach the total depth of the boring will be installed <br /> through the center of the hollow stem augers and then the augers will -be <br /> withdrawn from the hole. The borehole annulus will be closed by pumping a <br /> s <br />