2012-09-06_REVISION - M2008070 (21)

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3.8 NOISE Affected Environment: The Phase 2 site is located in a rural setting where existing noise levels are primarily caused by natural sources such as wind, water, birds, insects, and the like, though Hwy 64 and overhead aircraft clearly contribute to increased noise levels in this locale. The nearest residence to the pit is over 1500 feet north of the Phase 2 site and lies adjacent to Hwy 64. This residence is owned by Sam and Virginia Love, who also own all the immediately adjacent lands and are leasing their property for the Phase 2 gravel pit operation. The house is a seasonal dwelling for hired help in their agricultural operations. There are no other residences within 2 miles of the Phase 2 site. The gravel pit operations are subject to noise pollution regulations as established by RBC (Section 260 —Noise and Vibration). Specifically, noise levels generated by stationary equipment may not exceed 65 dBA at the edge of the Property. Uses that exceed this level during limited periods of construction are exempt from this restriction, provided that the activity is carried out during daylight hours. Since the pit will only operate during daylight hours and the construction phase will be limited, the Proponent will be required to meet the 65 dBA limit for stationary equipment during normal pit operations. Environmental Consequences of Proposed Action: Stationary equipment in the gravel pit will include items such as a rock crusher, screening /washing plant, asphalt plant, concrete plant and conveyor belts, all of which will generate noise. However, the pit is located a significant distance from any residence and it will be initially shielded from residences and Hwy 64 by the spoils stockpiles. Further, since pit operations will necessarily involve excavation, the pit will gradually fall below the remaining outer structure of the natural bench (on top of which the stockpiles will rest) which will further shield noise emanating from the site. Mitigation: Though no data exists concerning ambient noise levels on the site, the presence of the White River, prevailing westerly breezes and the proximity of Hwy 64 and regular overhead aircraft flights would suggest a moderate ambient noise level in the area. The absence of towns or residential structures in close proximity to the site also significantly reduces the risk of noise levels exceeding the maximum level allowed by RBC regulations. However, once the site is operational, noise levels should be monitored to ensure compliance with RBC standards. The following noise reduction precautions will be undertaken to ensure compliance with the regulation: ❑ Pit operations may occur during daylight hours only. ❑ Pit operations may only occur Monday- Saturday. ❑ An earthen berm will be constructed around the north side of the pit to shield noise emanating from pit operations and create a buffer between the pit and the residence located across the White River to the north. ❑ Monitoring will occur once the pit is operational to ensure compliance with RBC standards. Environmental Solutions, Inc. Page 24 of 30 March 09