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1 <br /> PRECISION SAMPLING, INC. <br /> 1 <br /> SOIL CORING, SOIL VAPOR SAMPLING, AND PIEZOMETER/SPARGE <br /> ' POINT INSTALLATION PROCEDURES <br /> SOIL CORING PROCEDURES <br /> ' Soil cores will be obtained by PRECISION SAMPLING, INC (PSI), a soil and <br /> ground water sampling company with offices in San Rafael, California, and <br /> Costa Mesa, California PSI uses portable, hydraulically-driven soil coring <br /> ' systems to obtain soil and ground water samples for lithologic and chemical <br /> analysis PSI's difficult access rig, the DA-1, utilizes a hydraulic hammer to <br /> drive its patented Enviro-Coram sampling rods into the ground to collect <br /> continuous soil cores The larger sampling rigs, the XD-1 and MD-1, are <br /> mounted on 4-wheel-drive vehicles, and the Enviro-Core rods are advanced <br /> with vibrators, a hydraulic hammer, or pushed into the ground. With any rig, <br /> two nested sampling rods are driven simultaneously. small-diameter inner <br /> sampling rods are used to obtain and retneve the soil cores, the larger <br /> diameter (2 112" OD) outer rods serve as temporary drive casing <br /> As the Enviro-Core rods are advanced, soil is driven into a 1 7/B-inch-diameter, <br /> 3-foot-long sample barrel that is attached to the end of the inner rods Soil <br /> samples are collected in 1 314-inch-diameter by 6-inch-long stainless steel <br /> ' sleeves inside the sample barrel as both rods are advanced After being driven <br /> 3 feet, the inner rods are removed from the borehole with a hydraulic winch <br /> The stainless sleeves containing the soil samples are removed from the inner <br /> sample barrel, and can then be preserved for chemical analyses or used for <br /> lithologic identification After adding new stainless steel sleeves, the drive <br /> sampler and inner rods are then lowered back into the borehole to the previous <br /> depth, an additional 3-foot section of Enviro-Core casing is attached, and the <br /> 1 process is repeated until the desired depth is reached <br /> ' The use of outer rods prevents sloughing of the formation while the inner rods <br /> are withdrawn from the hole This ensures that the drive sampler will always be <br /> sampling soil from the desired interval, rather than potentially contaminated soil <br /> ' that has sloughed in from higher up in the hole <br /> iiia tmarkerA*ro d« <br />