WORK PLANS - Laserfiche WebLink

Home Browse Search

N EGG Soil Sampling (SS) For a detailed reference on direct k push soil sampling, refer to Robertson et al, 1998. 71 - A,, c� Gregg In Situ, Inc. uses a piston -type sampler to obtain relatively undisturbed _ soil samples without generating any soil cuttings, Figure SS. Two different types of samplers (12 and 18 inch) are used _ depending on the soil type and density. The soil sampler is initially pushed in a "closed" position to the desired sampling interval using our hydraulic rig. Keeping the sampler closed minimizes the potential of cross contamination caused _ by sloughing. The inner tip of the 1 11� sampler is then retracted 12 inches (or ` 18 inches if using the longer sampler) _ leaving a hollow soil sampler with two s mi inner 1% inch diameter by 6 inch or four ` 3 inch long soil sample tubes. If using the 18 inch sampler, two 1'/z inch diameter by 6 inch long tubes will be ` exposed. The hollow sampler is then — pushed in a locked 'open" position to collect a soil sample. The filled sampler ` and push rods are then retrieved to the ground surface. Because the soil enters the sampler at a constant rate, the .. opportunity for 100% recovery is increased. For environmental analysis, the soil sample tube ends are sealed with Teflon and plastic caps. Often, a longer "split tube" can be used for geotechnical sampling. For a detailed reference on direct k push soil sampling, refer to Robertson et al, 1998. 71 - A,, c� 71 A 1 11� f � � Y t s p 8 s mi Air Figure SS A summary of the soil samples collected, including the sampling date, depth and location identification, is presented in Table 1.