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( I f I) <br />STATE OF COLORADO <br />• OFFICE. Of THE STATE ENGINLER <br />Division of Water Resuun r, <br />Department of NAIUral Rcsoor r•, <br />111 S Shnnnan 51n•la, WHIM 0111 <br />Denwr. Culnradn 611911 <br />11hoon ISIUI 866-1581 <br />FAX 151131666-391o <br />Mr. Jim Stover, P.E. <br />Consulting Engineer <br />2768 Compass Drive, Suite 101 <br />Grand Junction, Colorado 81506 <br />RE: Bowie No. 2 Mine <br />New Permit Application <br />Permit C-96-083 <br />Dear Mr. Stover: <br />August 9, 1996 <br />0 co 0 <br />a g <br />? rBi6 ? <br />K. ry Rr"m•r <br />(.rvrn"n <br />Pm,-, S. frahh."A <br />f vv ubvr Dmr lur <br />I lai D. Srnywrn <br />+L,Ir LrOinrrr <br />This is in response to your letter of August 5, 1996, critiquing our comments in my letter <br />of March 13, 1996. <br />Item 2 refers to our comment regarding plugging drill holes penetrating unconfined <br />• aquifers and your question if DMG rules are different than DWR's. In short, DWR's rules and <br />DMG's rules regarding plugging this type of drill hole are different. <br />Specifically, DMR's Rule 4.07 as cited in your letter states: <br />407.3(2) (in part) <br />"Exploration holes, drill holes or boreholes, wells, or other underground <br />openings completed in aquifers shall be sealed using cement or other <br />suitable sealant by placing the sealant in the hole from the bottom to <br />within 10 feet of the surface." <br />While DWR's Water Well Rules and Regs specifically state: <br />15.2 Unconfined Weiis - Weis completed into unconfined aquifers shali be <br />plugged and sealed by filling with drill cuttings, clean sand or clean <br />gravel to the static water level, then with clean native clays, cement <br />or high solid bentonite grout to the ground surface. A permanent <br />watertight cover shall be installed at the top of the casing." <br />These differences are moot, however, if the drill hole is for prospecting or obtaining <br />minerals, in that Rule 3.2 of the Water Well Construction Rules specifically state: <br />"3.2 By statute these Rules do not apply to excavations made for the purpose <br />• of obtaining or prospecting (emphasis added) for minerals .... as those <br />wells subject to the jurisdiction of the Mined Land Reclamation Board as <br />provided in Article 32 of Title 34 (Minerals) and Article 33 of Title 34 <br />(Coal), C.R.S.