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1 fEf <br />• E <br /> 8 November 1995 <br /> AGE-NC Project No 95-0130 <br /> Page 3 of 7 <br /> E <br /> Review of ground water surface elevation contour maps published by the San Joaquin County Flood E <br /> Control and Water Conservation District suggests that regional ground water flow is towards the <br /> southwest Conversely, previous ground water monitoring events suggest that local ground water <br /> flow beneath the site is towards the east <br /> 3.0. SCOPE OF WORK <br /> i <br /> 3 1 DRILLING AND SAMPLING <br /> I <br /> The proposed investigation includes the advancement of five (5) soil borings (MW-4, MW-5, VW-1, <br /> VW-2 and VW-3)utilizing;a truck mounted, hollow stem drill ng and 8 25- or l0-inch hollow stem <br /> augers Bonngs MW-4 and MW-5 will be drilled to depths of approximately 80 feet, borings VW-1 <br /> through VW-3 will be drilled to depths of approximately 65 feet <br /> I <br /> Soil samples will be collected at five-foot intervals beginning at 10 feet below site grade(bsg) using <br />. a California split-spoon sampler and brass sleeves The sampler will be driven by dropping a 140- <br /> pound weight from a height of 30 inches Upon sample retrieval, the middle brass sleeve will be <br /> removed from the sampler The ends of the sleeve will be immediately covered with teflon tape or <br /> aluminum foil, sealed with plastic end caps, secured with tape, and immediately placed in a chilled <br /> container for transportation to a State-certified laboratory Each sample sleeve well be labeled with <br /> the following boring location, depth, time, date and sampler's initials <br /> I <br /> Soils are to be described using the Unified Soil Classification System (USCS) Soil sample I <br /> descriptions and PID sci eening results would be summarized on boring logs prepared for the final <br /> report <br /> I <br /> Cuttings and rinseate generated during drilling activities will be containerized in properly labeled <br /> D O T model 17H 55-gallon drums, and stored on-site in an area inaccessible to the general public <br /> Disposal alternatives will be evaluated based on results of soil analyses <br /> 3 2 EQUIPMENT DECONTAMINATION <br /> All sampling tools and brass sleeves used for sample collection will be thoroughly rinsed with clean <br /> water after washing with a solution of Alconox All hollow stem augers are steam-cleaned prior to <br /> advancement in each borehole <br /> s <br />