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EGG <br /> Soil Sam ling <br /> n <br />' p J <br /> (SS) <br />' Gregg In Situ, Inc uses a piston-type r <br /> sampler to obtain relatively undisturbed <br /> "A <br /> soil samples without generating any soden "" <br /> _ h <br /> cuttings, Figure SS Two different types <br /> of samplers (12 and 18 inch) are used k ' <br /> depending on the soil tyand density <br /> pe ` -� — <br /> The soil sampler is initially pushed in a <br /> "closed" position to the desired sampling ¢ <br /> interval using our hydraulic rig Keeping " <br /> 3 6 <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) y. <br />' leaving a hollow soil sampler with two S <br /> inner 1'/4 inch diameter by 6 inch or four <br /> 3 inch long sod sample tubes If using <br /> the 18 inch sampler, two 1% inch 4 <br />' diameter by 6 inch long tubes will be N c <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 - � 4 <br /> ground surface Because the soil enters <br />' the sampler at a constant rate, the ° <br /> opportunity for 100% recovery is Yyr , <br /> increased For environmental analysis, mat Plfan <br /> the soil sample tube ends are sealed 4u 4 <br /> s <br /> with Teflon and plastic caps Often, a FUO to <br /> I longer "split tube" can be used for DOWMd Sample, <br /> geotechnical samplings` -�? s' , <br /> �70W n, ���v <br /> For a detailed reference on direct <br />' push soil sampling, refer to <br /> Figure SS <br /> Robertson et al, 1998 <br /> IA summary of the soil samples collected including the sampling date depth and <br /> Ilocation identification, is presented in Table 1 <br /> I <br /> I <br />