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~~ SOUTNWESTERTLAND CEMENT COMPANY MO IN DIVISION P.O. Box 529 • Lyons, Colora0o 80540 • (303) 8238685 Mr. Carl B. Mount Reclamation Specialist Department of Natural Resources Mined Land Reclamation Division 423 Centennial Building 1313 Sherman Street Denver, Colorado 80203-2273 MAR 041987 Dear Mr. Mount: i ,1., March 3, 1987 RECEIVED MINED LAND RECLAMATION DIVISION In your letter of February 6, 1987, Mrs. Darcy Daum had three areas of concern regarding our mining and manufacturing operations. I would like to address each of these concerns in an attempt to alleviate any problems or inconveniences in the future. Last year, mining has increased south of County Road 10. For the 18 years of operation, mining has taken place north of this road. Ore reserves have been nearly exhausted here, requiring a move to the south. According to our mining plan, which is filed with your office, we are on the prescribed schedule. At present, most of the mining activity is in this area and will be for the next 5-6 years. Blasting is done approximately 100 times per year and has been since the plant started operations. The intensity of the blasts has not increased; however, there are some possible explanations for the noise. Blasting done in shallow holes on outcrops create more noise. The noise can be restricted by shooting small but more frequent shots.. During the winter months, the area is susceptible to temperature inversions. Noise will rebound off the inversion layer as though it hit a wall. All blasts are monitored by a seismograph and compared with Federal standards by a registered geophysicist. Nothing out of the ordinary has been recorded. These records are open for your inspection at any time. We have been aware of and have been monitoring the activity of the nesting eagles in our area. We have seen the eagles leave and then return after a blast. Eagles have never been blasted out of the trees. The closest blast to an eagle has been about one-quarter mile.