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Dec-5-00 17:06; Page 4/6 6 • h '1 Sampling Basics Robe Rod Clean all parts prior to use. irut211 0-rings on the PK1313 andCn ; C the PRT adapter. Inspect the probe rods and clear then,of all II olxaucrions. TESTFIT the adapter with the PRl'fittuig on the expendable:t"ni holder ro assure tlur the threads are a compatible and hr tuguilrer smoothly. Remember,PRY'futeiuigs 5eouingadaptatotubing With tape. Tubing are left-hand threaded! Push the adapter iuw the end of the Nort Tape does not tonLutsoil gas selected tubing. Tape may be used on the outside of dot. sample. Cadapter and tubing to prevent the tubing froin spinning frcdy 1 around the adapter during connection—especially when using Teflon tubing. The sample will not contact the outside of the tubing or adapter. Drive the PRT tip configuration into die ground(Figure l). Connect probe rods as necessary to reach the desired depth. After depth has been reached,disengage the expendable point by pulling up on rhe probe rods. Remove the pull nip from rhe cup probe rod,and position the Geoprobc O-R* unit to allow room to work. Insert clic adapter std of the tubing down the inside diamcxer of the i probe rods(Figure 2). Need clic tubing down the rod bore until it hits bottom on the expendable point holder. r. Allow about 2 fe(610 min)of tubing co extend PRF Fspendabk Paiar out of the hole before curring it. Grasp the Holder excess tubing and apply sonic downward pressure while turning it in a counterclockwise satiny motion to engage the adapter du'cads with the expendable point holder(Figure 3). Pull up lightly on the tubing to rest engagctnenc of the threads. (Failure of ulapter to thread could figure 2.insert adapter Flgure 3.Engage threads E�endabk Drive titan that intrusion of soil may have occurred end of tmbin ow„the to by rotating tubing during driving of probe rods or disengagement of probe rods. Plot of drive point.) - f 4ure 1.A uoss section of probe rods that are being driven ' Conn=the outer end of the tubing to the Silicone lubitig Adapter to depth and than retracted roallow for soilgassampling. and vacuum hose(or other sampling apparatus), hollow the The PRT adapter and tubing are now fed through the tads appropriate sampling pn,ccdu re for collecci ng a soil gas sample jnd rotated to form a vacuum-tight connection at the point > (Figure 4). After collecting a sample,diswan cr the tubing from the t' holder.the lo is a continuous run of tubing from the ' vacuum hose or sampling system. Pull up Firmly on the tubing until samplek�elt°t hesturface ' it relcasa from the adapter at die bottom of the hole. (Taped tubing requires a stronger pull.) Remove die tubing from rhe probe rods, Dispose of polyethylene tubing or dccouraminate Tcflono tubing as i�. protocol dictates. t Retrieve the probe rods from die ground and rccaver ncc expendable '^ point holder with the attached PRT adapter. !aspect the O-ring at the base or the PRI'adapter to verify that proper sealing was Figure igufor cit. Taking WI lnbgassa th achieved during sampling. The 0-ring should be compressed. This ' the PRT system. K seal can be tested by upping die open end of the point bolder applying vacuum to Elie PRT adaprer. 1'teparc for the nest sample, ;7 8 6 18MB