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i <br /> EGA it SamIrAi <br /> S® � J <br /> MEW (SS) <br />' Gregg In Situ, Inc uses a piston-type ,;, <br /> sampler to obtain relatively undisturbed <br /> soil samples without generating any sod 7 a <br /> I <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 a4 <br /> "closed" position to the desired sampling a ' y� <br /> interval using a hydraulic ng Keepingf`' � <br />' the sampler closed minimizes the <br /> potential of cross contamination caused ;r <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 /> re <br /> inner 1%4 inch diameter by 6 inch or four � 1 <br /> 3 inch long soil sample tubes If using <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 /> z*° �� p E ; x fir, <br /> pushed in a locked "open" position to v�� � > :' g �_ ��� , <br />' collect a soil sample The filled sampler <br /> and push rods are then retrieved to theT i3 ; f �,= �;;w }_ § <br /> ground surface Because the soil enters `r <br /> t24V4p,J'Ybr6a! 'YQ4r F��6.y'yf1+�$1xJ' <br /> the sampler at a constant rate, theINA <br /> . V�s <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 PUSh to <br /> longer "split tube" can be used for osidrw SamPla,,-Ly�,-x, <br /> fea <br /> u♦ a,,, scr ��i4.,, qua;; _ �acPm ". <br /> geotechnical sampling <br /> For a detailed reference on direct �` �A " `�` ' <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 /> 1 <br />