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f`n~~.~ i <br />{ Q ~ r ~j- ~ O y III I II I II I II IIII III Adequacy Items <br />3'W SHH AGRA Project E92-7075 <br />~~i ~ Pege 6 <br />i' Bi <br />7 tS <br />3. Exposed, unweathered 4th Ridge material will be covered with topsoil and ~~,~-,,~ <br />revegetated. ,~,.~ <br />4. No drainage from disturbed ground will be allowed to Flow off-site without _~" <br />routing through a detention pond. `% ~' <br />y~ M <br />5. High calcium carbonate (CaCo,) content in the limestones and shales will tend to -` <br />buffer (increase the pH) any potentially acidic water. <br />• How will dust be controlled from blowing on and off site? Also, how will kiln dust <br />be 6aodled from the Dowe Flats quarry at the Lyons plant? <br />The firm of McVehil-Monnett, Inc. has been the project air quality consultant for over three <br />years. A meteorological and dust sampling station has been set up and quarterly monitoring has <br />occurred for three consecutive years. A permit application (for dust) has been submitted to the <br />Colorado Department of Health, Air Quality Division and is in the process of being reviewed. <br />Dust control measures included in the permit include road watering, chemical dust-control on <br />certain unpaved roads, paving, vehicle speed control and rapid revegetation combined with <br />minimizing the acreage of disturbance. The Division is welcome to contact the Health <br />Department or review the monitoring results and permit application. <br />Kiln dust produced at the cement plant from raw materials mined at Dowe Flats will be handled <br />~1, ~,~ in the same manner as is currently practiced and as is currently permitted by the CMLRB. Dust <br />~ will be hauled by truck to the existing, permitted quarries on the plant site (not to Dowe Flats) <br />and backfilled into the quarries. <br />BlastinP Effects - "Ground Vibrations Study and Air Overpressure Analysis" -Please ,~~ <br />respond to Allen Sorenson's Memorandum dated October 13, 1993 (attached) in which he <br />reviewed this report. ' <br />1. The scaled distance equation was developed from monitoring of blasting at the existing <br />Lyons Quarry solely for use in prediction of ground vibration levels and air overpressure <br />levels at the Dowe Flats project and is not proposed for use in compliance verification. <br />For compliance during mining at Dowe Flats, Southwestern Portland Cement plans to <br />instrumentally monitor each blast at a point between the blast and the nearest occupied <br />structure. During the early phases of mining, two blast monitoring instruments are to be <br />used, allowing monitoring to be conducted north and south of the blast. <br />Southwestern Portland Cement plans to notify adjacent landowners and conduct pre-blast <br />surveys in accordance with Office of Surface Mining Reclamation and Enforcement <br />requirements as presented in the "Blasting Guidance Manual" (Rosenthal and Morlock, <br />1987). <br />Ln A G R A <br />EerM & Emdronmente/ Group <br />