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EGG Soil Sampling <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 Y <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 4 <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'/4 inch diameter by 6 inch or four <br /> 1 3 inch long soil sample tubes V using <br /> the 18 inch sampler, two 1 MS 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 /> i collect a soil sample The filled sampler <br /> and push rods are then retrieved to the <br /> ground surface Because the soil enters <br /> I the sampler at a constant rate, the , <br /> opportunity for 100% recovery it <br /> 1 -increased For environmental analysis, <br /> the soil sample tube ends are sealed <br /> with Teflon and plastic caps Often, a p m <br /> r longer "split tube" can be used for - <br /> 1 geotechnical sampling <br /> For a detailed reference on direct <br /> [ push soil sampling, refer to Ngure S. <br /> Robertson et al, 1998 <br /> t <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 /> f <br />