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/ I .f I,~ <br />STATE OF COLORADO <br />• OFFICE. OF THE STATE ENGINLER <br />Division u( Walcr Rewun r, <br />UeparUm nl of Natural RcSnun r. <br />1 Sl 4 Shnnnen SinaN, Houm 0171 <br />DCOVPr. Colorado 1{11!111 <br />I'hunr ISIIJI lNrh-151{ 1 <br />rA%lSlnl Obb-Sil{0 <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 />of coo <br />a g <br />.~A~~': <br />~ rBi6 ~ <br />Kr ry k. nn,•r <br />l~rvrn"n <br />Innu•s 1 Lu hhrad <br />hrr ubvr Urtn lur <br />I tai D. Srnywrn <br />+Lnr Lrginrrr <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 - vueiis completed into unconfineti aquifers shalt be <br />plugged and sealed by tilling 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 prosaecting or obtainino <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 />(Coall, C.R.S. <br />