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7/17/2015 <br />State.co.us Executive Branch Mail - Re: TR46 <br />STATE, OF Hernandez - DNR All sha <al sha.hernandez state.co.us> <br />COLORADO , Y Y <br />Re: TR46 <br />1 message <br />Simmons - DNR, Leigh <leigh.simmons@state.co.us> Thu, Jul 16, 2015 at 11:25 AM <br />To: "W D Corley, Jr." <ajjc@att.net>, Alysha Hernandez - DNR <alysha.hernandez@state.co.us> <br />Cc: Rob Zuber- DNR <rob.zuber@state.co.us>, Mike Boulay - DNR <mike.boulay@state. co.us> <br />Thank you for your correspondence Dr Corley. <br />Alysha, please scan Dr Corley's email to c1981014, TR46, "Additional Correspondence" <br />1313 Sherman Street, Room Denver, O 80203 <br />On Thu, Jul 16, 2015 at 8:08 AM, W D Corley, Jr. <ajjc@att.net> wrote: <br />Mr. Simmons, <br />wrote previously that the proposed nitrogen generator unit for supplying an inert atmosphere for drilling <br />of the new monitoring well is inadequate. Here is the basis for that statement. According to the drilling <br />plan included with TR46 a nitrogen unit rated at 1500 scfm will be used to provide an inert atmosphere. <br />The s in scfm designates standard atmospheric pressure which is 14.7 psi. If down the hole hammer drilling <br />is utilized the hammer will require approximately 1000 cfm at 350 psi gas supply. The nitrogen unit would <br />only furnish 63 cfm of nitrogen at 350 psi and the remaining 937 cfm will be air; the gas mixture supplied to <br />the down the hole drill hammer with be approximately 80.3% nitrogen and 19.7% oxygen. Actual nitrogen <br />concentrations will probably be less if the nitrogen unit only produces approximately 95% nitrogen purity <br />and if the output is derated because of the site elevation of 6234 feet. <br />While the explosive range of methane is quoted to be 5 to 15% at standard atmospheric pressure, the <br />pressure will be far higher with a down the hole hammer, and the explosive range of methane will be much <br />wider (Zabetakis, 1965). <br />Doug Corley <br />https:Hm ai I .googl e.com/m ai I/u/0/?ui= 2&i k=e29129fcb5&view= pt&search= i nbox&th=14e97e635e7c555c&si m l=14e97e635e7c555c 1/1 <br />