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<br />COLORADO <br />~~ <br />COMPANY <br />III IIIIIIIII IIII III ~ ~ • ~~PLIEN (1898-1969) <br />CHARLES H. LIEN-PRESIDENT <br />• aRUCE H. LIEN-CHAIRMAN OF THE BOARD <br />" ~ PETE LIEN-C.0.0. <br />CRUSHED LIMESTONE • GYPSUM • CALCIUM FEED SUPPLEMENT • SILICA SAND <br />Non-Metallic Minerals <br />P.O. Box 1961 <br />Fon Collins, CO 80522 <br />9701493-6294 <br />Fax: 970/490-1063 <br />Located 19 miles NoM of Fort Collins near Owl Canyon <br />A Division of Pete Lien 8 Sons <br />P.O. Box 440 <br />Rapid Ciry, SD 57709 <br />605/342-7224 <br />Fax: 605/342-6979 <br />Located at Interstate 90 b Deadwood <br />19 March 1997 <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 />RECEIVED <br />MAR 2 Q 1.997 <br />SUBJECT: NOTIFICATION UNDER RULE 3.1.5(9) Dhrisan.of Minerals 8 Geob91 <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 permit area. <br />We propose to backfill very small portions of the above three quarries with a <br />material commonly known as "hydrator grit.° Hydrator grit is the byproduct of <br />hydration of quicklime (calcium oxide) to hydrate (calcium hydroxide) and <br />consists of a material with approximately 50% calcium carbonate (limestone), <br />20% silicon dioxide (silica sand), and 30% 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 thie <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 />