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a <br /> _ 3 <br /> EGA Soil Sampling <br /> � SS <br /> ( ) <br /> Gregg In S€tu, 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 /> l <br /> depending on the soil type and density <br /> f The soil sampler is initially pushed in a <br /> "dosed" position to the desired sampling <br /> interval using a hydraulic ng. 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 /> t inner 1'/ inch diameter by 6 inch or four <br /> 3 inch long sod sample tubes If using <br /> the 18 inch sampler, two 1'/z inch <br /> #' diameter by 6 inch long tubes will be <br /> l exposed_ The hollow sampler is then <br /> pushed in a locked "open" position to <br /> collect a sod sample. The filled sampler <br /> i and push rods are then retrieved to the <br /> ground surface Because the sod enters <br /> the sampler at a constant rate, the <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 <br /> geotechnical sampling. <br /> For a detailed reference on direct <br /> push soil sampling, refer to FFgure 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 /> l <br />