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r EGG Soil Sampling <br /> P 9 <br /> (SS) <br /> Gregg In Situ, Inc. uses a piston-type <br /> sampler to obtain relatively undisturbed <br /> soil samples without generating any soil _ <br /> cuttings, Figure SS. Two different types <br /> of samplers (12 and 18 inch) are used <br /> depending on the soil type and density. <br /> The soil sampler is initially pushed in a <br /> "closed" position to the desired sampling <br /> interval using our hydraulic rig. Keeping <br /> the sampler closed minimizes the <br /> potential of cross contamination caused <br /> by sloughing. The inner tip of the <br /> sampler is then retracted 12 inches (or <br /> 18 inches if using the longer sampler) <br /> leaving a hollow soil sampler with two <br /> inner 1% inch diameter by 6 inch or four <br /> 3 inch long soil sample tubes. If using <br /> the 18 inch sampler, two 1'/ inch <br /> diameter by 6 inch long tubes will be <br /> exposed. The hollow sampler is then , <br /> pushed in a locked "open" position to <br /> collect a soil sample. The filled sampler <br /> and push rods are then retrieved to the <br /> ground surface. Because the soil enters <br /> the sampler at a constant rate, the <br /> opportunity for 100% recovery is <br /> increased. For environmental analysis, Rehsrt P4ftn <br /> the soil sample tube ends are sealed <br /> with Teflon and plastic caps. Often, a Pum t1D <br /> longer "split tube' can be used for D Sample <br /> h <br /> geotechnical sampling. DqAh <br /> to <br /> Obtain Soil <br /> Sample <br /> For a detailed reference on direct <br /> push soil sampling, refer to Figure SS <br /> Robertson et al, 1998. <br /> A summary of the soil samples collected, including the sampling date, depth and <br /> location identification, is presented in Table 1. <br /> r � <br />