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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 fF` <br /> cuttings, Figure SS Two different types ; <br /> of samplers (12 and 18 inch) are used <br /> depending on the sod type and density :P <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 k' <br /> potential of cross contamination caused <br /> by sloughing The inner tip of the n <br /> sampler is then retracted 12 inches (or <br /> 18 inches if using the longer sampler) s <br /> leaving a hollow soil sampler with two <br /> inner 1% inch diameter by 6 inch or four 4 <br /> 3 inch long soil sample tubes If using A ; <br /> the 18 inch sampler, two 1'h inch a ; <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 <br /> the soil sample tube ends are sealed <br /> with Teflon and plastic caps Often, a Posh to <br /> longer "split tube" can be used for Deelred Semple <br /> Dpthi,� = ' ^� Push to <br /> rfr" <br /> geotechnical sampling } <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 /> • <br />