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iii iiiiiiiiiiiii iii . • • <br />COLORADO GEOLOGICAL SURVEY <br />Division o(Minerals and Geology <br />Depanmenr of Natural Resources <br />1313 Sherman SveeC Roorn 715 <br />Denver, Colorado 80'03 <br />Phone (303) 866-261 I <br />FAX (3031 866-2461 <br />STATE OF COLORADO <br />Ulb~ <br />DEPARTMENT OF <br />NATURAL <br />RESOURCES <br />January 25, 1995 Roy Romer <br /> Governor <br /> lames S Lochhead <br /> Executive Oirealor <br />Ms. Ann Tatum Michael 8. Long <br />Jim Tatum and Associates Division Dirennr <br />P.O. Box 28 "`'i cnwa" <br /> Srare Geologic <br />12630 Hwy. 12 and Direcbr <br />Weston, Colorado 81091 <br />RE: Methane Gas <br />Dear Ms Tatum: <br />In answer to your letter of January 18, I am enclosing a copy of the report we sent recently <br />to county and city planners on coalbed methane, a section of an Amoco report on a <br />methane occurence near Durango, and an article referenced in the Amoco report. <br />As you can see from the enclosures, methane does not pose any toxic hazard to humans or <br />animals unless present in a confined area in quantities sufficient to cause oxyge^ <br />deprivation. It can also be explosive if contained in unventilated buildings or mines. There <br />is also a possibility of damage to plants due to oxygen deprivation. <br />The U.S. Mine Safety and Health Administration tracks methane emission from coal mines. <br />Construction of unventilated structures directly overlying coal seam outcrops could be <br />hazardous as the coals in this area are naturally gassy. <br />Yours truly, <br />~,~-'1 l <br />Carol Tremain, <br />Senior Geologist <br />cc Pat Rogers <br />