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~P.'1T Ny. nxFnl~ I.~TN Nr, TNr..; <br />MONRORIIJ6 <br />• <br />Q7(1 q9q 5177; Fah.d.CQ gt:~,9]M; P.q ~7n 5'S <br />leak. A second opcaing is neoded for a ~pl?laeement tube. Often it is not <br />possible to pull tubing out. DONT cut it and let it fall; it will block the <br />borehole. <br />A third opening is for a preesure gage, or for a tube to which a pressure <br />gage can be ooanected. As discussed in Aamyli~p ru1_e 1 and Borohole <br />1?reaaures, samples ale worthless if taken when air $ows or leaks into a <br />borehole (the borehole is said to ba `negative"). DO not connect the gage <br />inW the seniplingline; that generally produces leaks that make worthless <br />samples. <br />The fourth opening >e 1br a cl-w:k valve through which methane and <br />heated air can bleed off. Were it not for this valve, over the weeks to <br />moatite, and sometimes years, of sampling, t:bese, rather thau the actual <br />in-mina atmoephe.+aa, could become the principal gases in the eample9. <br />Samplinfl Tuba, As shown is the sketch below, tubing (pipe) through <br />which sampler, are withdrarva from the mine extends from the mine floor <br />(or debris) beneath boreholss to the sampling pump(s) on the surface. <br />Tubing to <br />Samplirp Pump <br /> <br />~~ Sealant (Like Sllicons) <br />Mp~~~ppppla <br />Gr'p <br />Grow[ <br />9/8.12' Metal Pipe ~ <br />Floor -Bottom - 9• <br />Tubng <br />Grip (Like Kellum) <br />Roof <br />rF •1!f Htlt• Hole. N Moles Plum Top • Dottom <br />N a Pipe Dlameterlt).~625 <br />Cap or Plup <br />Batom <br />MINE FlRES qq <br />