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• ~ • iii iiiiiiiiuiiiiii <br />CHARLES H. utn899 ,,,,,~... <br />• BRUCE H. _IEN-CHAIRMAN OF THE BOARD <br />~' ~ PETE LIEN-C.0.0. <br />COLORADO <br />LJ ~J <br />COMPANY <br />CRUSHED LIMESTONE • GYPSUM • CALCIUM FEED SUPPiLEMENT • SILICA SAND <br />Non-Metallic Minerals A Division of Pete Lien IF Sons <br />P.O. Box 1961 P.O. Box 440 <br />Fort Collins, CO 80522 Rapid Ciry, SD 57709 <br />970/493.6294 6051342-7224 <br />Fax: 970/490-1063 Fax: 605/342-6979 <br />Located 19 miles NoM of Fort Collins near Owl Canyon <br />Mr. Tony Waldron <br />Colorado Division of Mining and Geology <br />Centennial Building Room 215 <br />1313 Sherman St. <br />Denver, CO 80203 <br />Lasted at Interstate 90 8 Deadwood <br />19 March 1997 <br />RECEIVED <br />MAR 2 ~ t397 <br />SUBJECT: NOTIFICATION UNDER RULE 3.1.5(9) DhdbionolMineraisBGeoiopy <br />APPLICABLE TO: Roberts Quarry Permit M-77-301 <br />Owl Canyon Quarry Permit M-77-302 <br />Rex Quarry Permit M-77-304 <br />Dear Tony: <br />As discussed with you, this letter is the notification under the above rule that we <br />intend to backfill inert structural fill generated outside the approved perrrlit area. <br />We propose to backfill very small portions of the above three quarries wth a <br />material commonly known as "hydrator grit.° Hydrator grit is the byprodLlct of <br />hydration of quicklime (calcium oxide) to hydrate (calcium hydroxide) anti <br />consists of a material with approximately 50°,U calcium carbonate (limest~me), <br />20% silicon dioxide (silica sand), and 30°/a various other materials, including <br />aluminum and iron oxides, calcium oxide and calcium hydroxide. The material is <br />generally moist (2-10%) and the particle size is a coarse sand. This material <br />comes from lime manufactured from limestone in South Dakota and hydrated at <br />our plant in La Porte, Colorado. The various components are all from the <br />original limestone: materials considered as contaminants in the hydrate, but not <br />a toxic or acid-forming material. The material is slightly alkali. <br />The following information is supplied, as required by Rule 3.1.5(9): <br />a. Narrative describing the approximate location of the proposed activity: <br />The grit will be placed at or near the bottom of open pits from which limestone <br />has been mined, prior to backfilling with innerburden and overburden in'the <br />process of backfilling to final reclamation grade. The grit will be placed in areas <br />where 10 feet or more of backfill from the quarry itself will be placed above it. <br />i <br />ti <br />