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energy fuels coal, inc. <br />SoulNieltl mine .post ollice Dot a49 . Ilorence, coloratlo 87226 • X303) 78<-6395 <br />December 9, 1986 <br />Mr. Randy Price <br />Colorado Mined Land Reclamation Division <br />423 Centennial Bldg. <br />1313 Sherman St. <br />Denver, CO 80203 <br /> <br />Re: Southfield Mine Technical Revision No. 3, Response to Issues <br />dated November 10, 1986 <br />Your File No. C-81-014 <br />Dear Randy: <br />In response to issues presented <br />concerning Technical Revision <br />• (EFCI) is submitting additional <br />ing and repair. The following <br />tion addressed in the letter, <br />in your above referenced letter <br />No. 3, Energy Fuels Coal, Inc. <br />information on subsidence monitor- <br />proposal incorporates each sugges- <br />Subsidence Monitoring Monuments <br />EFCI will install a line of subsidence monitoring monuments along <br />the Florence waterline, depicted on the attached Map 1 (revised <br />12/8/86), within one month of approval of this revision. EFCI is <br />proposing to utilize a waterline manhole structure near the south- <br />ern permit revision boundary as a subsidence monument. The struc- <br />ture is refered to as "Manhole and Sediment Trap No. 3" in the <br />McDermid Engineering Associates design drawings. The manhole <br />structure is supported on compacted bedding at a depth of approxi- <br />mately eight feet. A small point will be scribed in the concrete <br />surface and identified with orange paints. The City of Florence <br />will be notified of our intentions prior to establishing the <br />point. <br />Three monitoring monuments will be installed by EFCI north of the <br />manhole immediately adjacent to the waterline trench excavation. <br />Each monument will employ a No. 6 rebar pin set into one-foot of <br />mortar in a four-inch diameter hole drilled five-feet below the <br />existing surface. A four-foot length of three-inch diameter PVC <br />pipe will be installed around the rebar and extend down to the top <br />. of the mortar. Dry sand will be used to fill inside and around <br />the PVC pipe to the ground surface, Monuments will be identified <br />with a wooden stake and a lath with flagging. <br />