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1 <br /> � EGG <br />' Soil Sampling <br /> (SS) <br />' Gregg In Situ, Inc uses a piston-type <br /> - <br /> sampler to obtain relatively undisturbed <br /> soil samples without generating any soil <M r <br />' cuttings, Figure SS Two different types <br /> of samplers (12 and 18 inch) are used �5 <br /> depending on the soil a and dens: <br /> p g type density %�'��•�r,� � <br /> The soil sampler is initially pushed in a '` <br /> "closed" position to the desired samplings F� <br /> interval using our hydraulic rig Keeping r <br />' the sampler closed minimizes the ht <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) 4 <br /> leaving a hollow soil sampler with two <br />' inner 1% inch diameter by 6 inch or four R <br /> 3 inch long soil sample tubes If using <br /> the 18 inch sampler, two 1 Y2 inch <br />' • diameter by 6 inch long tubes will be <br /> w <br /> exposed The hollow sampler is then ^4 <br /> pushed in a locked "open" positron to s <br /> collect a soil sample The filled sampler <br /> and push rods are then retrieved to <br /> the <br /> ground surface Because the soil enters <br /> #� * <br /> I Z, <br /> the sampler at a constant rate, the <br /> opportune for 't00% recovery i <br /> increased for environmental analysis, <br />' the soil sample tube ends are sealed <br /> with Teflon and plastic caps Often, a PUS,to <br />' longer "split tube" can be used for Dred sample <br /> geotechnical samplingPuss,to <br /> a <br /> For a detailed reference on direct "ss •„�E,ftr`E " ' "� `�, -' `. <br /> I push soil sampling, refer to <br /> Robertson et al, 1998 Figure ss <br /> A summary of the soil samples collected including the <br /> p g sampling date, depth and <br /> location identification, is presented in Table 1 <br />