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~eta[ion ecology <br />~~Mazk A. Heffner, Ecologist • III IIIIIIIIIIIII III ~ <br />37 East Colorado Avenue Tand reclamation planning <br />Denver, CO 80210 Visual impart analysis <br />(303) 722-9067 (Voice and Fax) D«umentary photography <br />May 3, 1999 <br />Division of Minerals and Geology <br />Rm 215 Centennial Bldg. <br />1313 Sherman St. <br />Denver, CO 80203 <br />RECEIVEQ <br />MAY 0 5 1999 <br />RE: Gasline agreement <br />File No.: M-99-035 Holnam Gravel Pit <br />Dear Sirs: <br />D~vlsion o1 Minerai~ & GeWogy <br />Enclosed are copies of two letters regarding resolution of the gas line issue on this property. To <br />establish completeness it was initially agreed that Castle Concrete would remain at least 200 feet from <br />the gas line until an agreement was made with the gas company as to how close Castle could mine to <br />the gas line. In the application it states that Castle would stay at least 50 feet from the 4 inch high <br />pressure gas line owned and operated by Greeley Gas Company. <br />Subsequent discussions with Greeley Gas indicated they would prefer the setback be 100 feet rather <br />than 50 feet. The problem they were concerned about is based on previous experience with gravel pits. <br />Sometimes slope collapse due to groundwater or heavy precipitation causes rapid erosion of the slope. <br />They felt that staying 100 feet from the gas line would allow time to control such erosion if it <br />occurred. They felt this problem would only exist during that time when Castle is mining nearby. <br />Since the excavation will be backfilled with overburden, once that backfilling of the pit near the gas <br />line is completed there should not be any problems. <br />As indicated in the agreement letters, Greeley Gas will mazk the location of the gas line. Castle will <br />then avoid excavations within 100 feet of that line and if erosion of the slope cuts back into the 100 <br />foot setback Castle will take action to return the setback to the 100 foot point. <br />The mining plan maps show excavations occurring to 50 feet from the gas line. If the Division desires <br />new versions of the relevant maps they can be changed to show a 100 foot setback. Otherwise, it is <br />agreed that this gas line setback will become a part of the permit requirements. Please let myself know <br />your desires regarding the maps. If you desire new maps, perhaps it would be best to wait for <br />completion of the review process to see if any other changes are needed on the maps. Then as part of <br />the adequacy response new maps with this and any other changes could be provided. <br />Re~sp/ec~tfu/l~ly, ~J <br />~//GG~C Ll ~ r~~e G~i , <br />Mark A: Heffner <br />cc: Castle Concrete Company <br />Bob Deaver, Greeley Gas Company <br />