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I <br /> Each boring will be advanced to approximately ten feet below the water table <br /> or into �N clay or other material below the water table, suspected to be of <br /> lowere pl-rmability; whichever is less deep. Undisturbed soil samples will <br /> be obtained using the Dames & Moore Type-U sampler driven by a 140 pound <br /> i <br /> khammer fl'lling 30 inches. Samples will be collected from the borings at <br /> minimum intervals of five feet. The clean sampler will be driven into the <br /> soil beneath the open borehole. The soil samples retained in the 3-inch <br /> stainless steel tubes will be removed from the sampler and their ends sealed <br /> with teflon membranes and plastic end caps. Each sample selected for <br /> chemical analysis will be securely sealed, labeled and stored in ice cooled <br /> containers and delivered to Bio National Corporation under proper chain-of- <br /> custody.: All samples will be logged according to the Unified Soil <br /> Classification system. <br /> To prohibit cross-contamination of successive samples, the sampling <br /> i <br /> equipment will be disassembled between sampling attempts and washed with a <br /> f tri-sodili phosphate (TSP) soap solution. The samplers will then be <br /> i <br /> reassembled with clean 3-inch stainless steel tubes and then used for <br /> subsequent sampling. All augers and sampling equipment will be thoroughly <br /> I� steam-cleIaned between borings to prevent cross-contamination. <br /> k <br /> i <br /> 3.2 Ground _Water Investization <br /> The purpose of this investigation is to: <br /> o Evaluate the depth of ground water; <br /> o Evaluate the ground water gradient; and <br /> o Evaluate the hydrocarbons in the ground water. <br /> } 3.2.1 Observation Well Installation <br /> ti <br /> XV%A ground water wells will be installed at the facility. The wells <br /> will be installed for water level monitoring and ground water sampling <br /> RM01.005 4 November 7, 1988 <br /> t <br /> i �. <br />