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PRT Drawings . Pagel of 2 <br /> Ct <br /> ty rt <br /> Wk <br /> 1� <br /> Search d.��.e;l "'F , 4 ..�pr,r vY y 1-1�' Y tll�UiSN r.G.rey <br /> ' <br /> Field technicians can use a PRT Expendable Point Holder to sample <br /> soil gas with 1.25-inch probe rods. This point holder accepts 1-.1-inch <br /> OD Expendable Drive Points at the lower end (Figure A). These <br /> points are used because their 1.1-inch OD is smaller than the 1.25- <br /> inch probe rods and therefore does not provide an annulus when <br /> driven to depth. This size difference also means that a PRT Point <br /> Popper may be required to push the expendable drive point out of <br /> the point holder before a vapor sample is collected (Figure B). <br /> Push dovrnrrard <br /> [ ' ! on extension rods l <br /> t and point popper. 9 <br /> i 1,254nch Probe Rod <br /> Extension <br /> Rod <br /> 1 <br /> PRT Expendable <br /> Point Holder <br /> for 1.25-Inch J <br /> Q Probe Rods <br /> PT <br /> .•'" '�.GAY'J�' �d �. 1,�1 ' i ... <br /> wN I Pont +.�'f Expendable <br /> Popper drivepoint <br /> p is pushed from <br /> Expendable point holder. <br /> Drive Point <br /> V <br /> A Retractable Drive Point Assembly <br /> (AT21 B) may be used in place of the <br /> conventional expendable drive point. A <br /> PRT Retractable Point Holder (PR21 B) is <br /> used to attach the retractable point to the <br /> tool string and also requires an AT1226 <br /> adapter. The retractable point extends <br /> upon pull-back to allow gas sampling, but <br /> remains attached to the holder for further <br /> probing (Fig. C). <br /> http://",N�-NN,.-eoprobe.com/products/tools/sampling_tools/soil gas/prtdwg.htm 31/6/2003 <br />