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BAR <br /> susY <br /> OREM <br /> H <br /> ;--nol <br /> pressure measurements are taken while the piezocone is kept stationary at selected depth <br /> levels, allowing dissipation of the excess pore pressure. This dissipation is measured as a <br /> function of time) in order to derive the hydraulic conductivity of the soil surrounding the <br /> probe (similar to a slug test). <br /> 2.3 BATT' SAMPLING SYSTEM <br /> The BAT' sampling probes will be installed directly adjacent to the five existing <br /> groundwater monitoring wells(approximately 1-2 feet away to avoid backfill). In addition, <br /> two BAT'sampling probes will be installed away from the wells to further characterize the <br /> site (Figure 3). The BAT'sampling probes will be installed approximately six inches to <br /> one foot below the groundwater surface, which is expected to be at a depth of approximately <br /> 20 feet below ground surface. <br /> The BAT' system consists of a stainless steel probe assembly with a polyethylene filter <br /> through which the formation fluids will be sampled. This probe will be attached to a string <br /> of 1-inch diameter steel riser pipe, and will be pushed into the ground using the cone <br /> penetrometer rig (Figure 4). <br /> Once the BAT' probe is installed at the desired sampling depth, a groundwater sample will <br /> be collected by lowering a cylindrical sampling kit containing an evacuated glass sample vial <br /> through the riser pipe. As the sampling kit makes contact with the top of the BAT'probe <br /> assembly, a double ended, spring loaded hypodermic needle contained at the bottom of the <br /> sampling kit punctures a specially developed septum sealing the top of the probe. The <br /> continuing downward movement of the sampling kit then forces the upper end of the double <br /> ended hypodermic to penetrate a similar septum sealing the bottom of the glass sample vial. <br /> Once the connection is made between the probe and the:ample vial, the vacuum inside the <br /> sample vial draws the formation fluids into the probe, and up through the hypodermic into <br /> the sample vial. The sample will be retriaved by pulling the sampling kit up through the <br /> riser pipe. As the hypodermic is retracted from both septa, the septa immediately reseal <br /> 0A915MIMM121FI. 5 <br />