2004-09-14_GENERAL DOCUMENTS - M1993041

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- ! ~ Cotoratlo Division of Minerals & Geology AGRA Prajeci E94-7033 Response to Adequacy Comments December 5, 1994 Dowe Flats, Southdown, Inc. Pape (2) Southdown has publicly committed to post 24 hour, advance notice of blasting along County Road 47. When the blasts are to be made in close proximity of the County Road, we have recommended closing the road for brief periods, 5 to 10 minutes, using flagmen. Blasts close S~ nuja~~ enough to the road to justify closure are expected to be infrequent. y The timing of blasting will be during daylight hours, Monday through Friday. We will make every effort to only conduct blasts when atmospheric conditions should minimize noise and dust impacts, clear ino low clouds) and still days (<5-10 MPH winds). The frequency of blasts wilt vary over time. Current plans coil for an averago of Z io 4 blasts pe: week. with up to 3 blasts on a given day. Please provide the engineered designs of the bridge crossings over St. Vrain Creek and the irrigation ditches. Felsburg, Holt and Ullavig, Inc., the civil engineering design firm for the ditch crossings and bridges, will provide the drawings under separate cover. Where the conveyor crosses Highway 66, does the corrugated cover extend underneath the conveyor to enclose it and prevent any possible rock fall onto the hfghwayT The conveyor crossing of Highway 66 will be completely enclosed, precluding any rock or other conveyed material from falling on the highway. Is any dewatering of pile anticipated If groundwater is encountered If so, the appropriate permits must be obtained from the Office of the State Engineer or the operator must post a ~Ir- financial warranty to cover backfilling of the pits. ~C 3 • Dewatering of the pits is contemplated and the operator herein commits to obtaining any required permits from the State Engineer prior to exposing ground water. Southdown also commits to posting a financial warranty to cover backfilling of the pits. Z. Exhibit E -The Division has a concern that although 12 inches of topsoil are being stripped and saved, only 48 Inches of topsoil will be replaced during reclamation on disturbed areas. What w1ll be done with the rest of the topsoil? The Division is not convinced that 4 inches of topsoil will necessarily support a general agriculture future land use. The 4"-8" of topsoil replacement is a word processing holdover from the previous reclamation plan which called for varying topsoil depths. Southdown herein commits to 12" of topsoil removal and 12" of topsoil replacement. Waste rock end other overburden materials beneath the replaced topsoil will provide a suitable subsoil medium for root penetration deeper than 12". ~AGRA