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• COLORADO LJ ~J COMPANY III I II I II I II I'll III • PETER C. LIEN (1898.1969) ggg CHARLES N. LIEN~PRESIDENT BRUCE H. UEN~CHAIRMAN OF THE BOARD •• ~ PETE LIEN~C.0.0. CRUSHED LIMESTONE • GYPSUM • CALCIUM FEED SUPPLEMENT • SILICA SAND Non•Metallic Minerals ' P.0. Box 1961 Fort Collins, CO 60522 9701493-6294 Fax: 9701490-1063 Located 19 miles Narih of Fort Collins near O.vl Canyon A Division of Pete lien b Sons P.0. Box 440 Rapid Ciry, SD 57709 6051342.7224 Fax: 6051342.6979 Located at Interstate 90 8 Deadwood 19 March 1997 Mr. Tony Waldron Colorado Division of Mining and Geology Centennial Building Room 215 rt 1313 Sherman St. ® Denver, CO 80203 RECEIVEC~ MAR 2 0.1997 SUBJECT: NOTIFICATION UNDER RULE 3.1.5(9) Divilsion.otMineraisBGeobgy APPLICABLE TO: Roberts Quarry Permit M-77-301 Owl Canyon Quarry Permit M-77-302 Rex Quarry Permit M-77-304 Dear Tony: As discussed with you, this letter is the notification under the above rule that we ;,;; intend to backfill inert structural fill generated outside the approved permit area. - ~ We propose to backfill very small portions of the above three quarries with a material commonly known as "hydrator grit.° Hydrator grit is the byproduct of ;_ y~ hydration of quicklime (calcium oxide) to hydrate (calcium hydroxide) and , •;, •, consists of a material with approximately 50% calcium carbonate (limestone), '~. 20% silicon dioxide (silica sand), and 30% various other materials, including aluminum and iron oxides, calcium oxide and calcium hydroxide. The material is generally moist (2-10%) and the particle size is a coarse sand. This material comes from lime manufactured from limestone in South Dakota and hydrated at our plant in La Porte, Colorado. The various components are all from the ` original limestone: materials considered as contaminants in the hydrate, but not ~ ;~' ,~;, „ a toxic or acid-forming material. The material is slightly alkali. The following information is supplied, as required by Rule 3.1.5(9): r a. Narrative describing the approximate location of the proposed activity: ;`. The grit will be placed at or near the bottom of open pits from which limestone e~ has been mined, prior to backfilling with innerburden and overburden in the :- process of backfilling to final reclamation grade. The grit will be placed in areas ~.~ r_,ti where 10 feet or more of backfill from the quany itself will be placed above it.