Laserfiche WebLink
� EGG <br /> Soil Sampling <br /> Ap"Ii (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 <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 <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) <br /> leaving a hollow soil sampler with two <br /> inner I Y4 inch diameter by 6 inch or four <br /> 3 inch long soil sample tubes If using <br /> the 18 inch sampler, two 1'/ inch i <br /> diameter by 6 inch long tubes will be <br /> exposed The hollow sampler is then l P <br /> pushed in a locked "open" position to _ <br /> collect a soil sample The filled sampler <br /> and push rods are then retrieved to theM , <br /> ground surface Because the soil enters <br /> the sampler at a constant rate, the t <br /> opportunity for 100% recovery is y <br /> increased For environmental analysis - ' ` RebiRA Pstvn <br /> the soil sample tube ends are sealed _ ` - f �`xsnd L6ck lt-- <br /> with Teflon and plastic caps Often, a Push to - <br /> longer "split tube" can be used for v_ Desired Semple '^ <br /> geotechnical sampling [)epth m _ - ,< " rys Puslito <br /> Qin Soil <br /> _ Sarnpie <br /> For a detailed reference on direct 3� <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 />