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DEC 31 2002 11 : I1RM GREGG .DRILLING 9253130302 p. 3 <br /> EGG <br /> %7KE%7U UN SITU � e <br /> Geotechnical and Environmental In Situ Testing Contractors <br /> SOIL SAMPLING <br /> ; W A piston type soil sampler Is used to collect <br /> relatively undisturbed soil samples without <br /> Y: generating any soil cuttings. Two size <br /> pis- <br /> ton type samplers are used, 12 inch and 18 <br /> inch, depending on the density of the soil <br /> and the amount of sample required for <br /> analysis. <br /> The soil sampler is initially pushed in the <br /> closed position to the desired sampling in- <br /> h i T s a teNal. The push rods are then retracted, <br /> {.. �{ri -t �♦.v. i <br /> �, r 5 r approximately 12.inches or 18 inches ( de- <br /> iff�,q��,� , „fi ti{�r� >,, , a pending on the length of the sampler) <br /> which also retracts the Inner rod and tip of <br /> the soil sampler. Thler is then <br /> e sampler <br /> pushed in a "open" or "locked" position to <br /> collect a soil sample. After the sample is <br /> has been collected, the sampler and the <br /> u, `'w.: push rods are withdrawn from the test hole <br /> into to the CPT truck. The sample rings <br /> ' p gs <br /> two 1.25 inch diameter by 6 inch long or <br /> four 31nch long for the 12 inch sampler and <br /> two 1.5 inch diameter by 6 inch long for the <br /> r ,fi 18 inch sampler) are then removed from <br /> i° the sampler and sealed with Teflon and <br /> plastic caps. The sampler is then decon- <br /> taminated and ready to deploy to collect <br /> _ another sample_ <br /> f��+a�3{n°j}'�'r�''1L \.�4?''iLr`�•�'iyf'ki � ` ij{�i'+�r j 'l� <br /> Los Angeles (corporate)• San Francisco•Houston•Charlston <br /> Vancouver-Salt take City• New Jersey <br /> Tel:(562)427-6898•Fax(562)424-2329•Website:www.greggdriiiing.com <br />