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,r <br /> 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 " , <br /> of samplers (12 and 18 inch) are used , <br /> depending on the soil type and density r "A <br /> The soil sampler is initially pushed in a 'R ; <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 i <br /> s <br /> sampler is then retracted 12 inches (ort <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 F g <br /> the 18 inch sampler, two 1'/z inch <br /> diameter by 6 inch long tubes will be <br /> exposed The hollow sampler is then <br /> "open" <br /> r4 res, x^ is `-i r�rVs` t <br /> pushed in a locked open position to <br /> a <br /> collect a soil sample The filled samplers <br /> and push rods are then retrieved to the <br /> ground surface Because the soil enters R t <br /> the sampler at a constant rate, the 4° <br /> opportunity for 100% recovery is A <br /> increased For environmental analysis, <br /> the soil sample tribe ends are sealed <br /> with Teflon and plastic caps Often, a Ptsh to <br /> longer "split tube" can be used for DeWred Ime <br /> geotechnical samplingtr� ,,rh <br /> M <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 />