7.1. SR 02-21-2017 - Laserfiche WebLink

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Max Steininger, Inc.: Elk River Sand and Gravel Mine 8 | Page Zone Change & Conditional Use Permit Application December 2016 The mining operation will operate in compliance with all State noise standards. State standards have been established for daytime hours, defined as 7:00 a.m. to 10:00 p.m. and nighttime hours defined as 10:00 p.m. to 7:00 a.m. Nighttime standards are more restrictive for residential receptors. The project is proposing 24 hour operations and will therefore be subject to both daytime and nighttime residential standards. Table 1.1 Minnesota Noise Standards for Residential Land Uses Daytime Nighttime L50 L10 L50 L10 60 dBA 65 dBA 50 dBA 55 dBA Steininger is seeking 24 hour operations except for Sundays and holidays at the Site. Studies have shown that facilities with similar processing equipment and residential receptors at similar distances can operate in compliance with the daytime and nighttime noise standards Sound level mitigation will be adopted at the Site, including screening berms with additional height as needed adjacent to residential properties. Mining and processing will be recessed on the floor of the active mining area to reduce sound levels. Perimeter berms will be constructed to attenuate noise. Maintenance of operating equipment and use of standard noise control equipment such as mufflers will reduce sound levels at the Site. 6.6 Dust: Fugitive dust will be minimized by recessed operations, spray bars on processing equipment, dust suppressants on internal haul roads, and the establishment of permanent vegetation on perimeter berms and reclaimed areas. Fugitive dust will not exceed air pollution standards established by the Minnesota Pollution Control Agency. Processing equipment is subject to a MPCA air emissions general permit for non‐metallic mineral mining which includes standards for fugitive dust emissions. 6.7 Hours of Operation: The project is proposing 24 hour operations except Sundays and holidays. 6.8 Water Pollution: The Site will be operated in compliance with all applicable Minnesota Pollution Control Agency (MPCA) and Department of Natural Resources standards. The Site will operate under the General Non‐Metallic Mineral Mining National Pollutant Discharge Elimination System (NPDES) stormwater permit and Site specific Stormwater Pollution Prevention Plan. There are no surface waters including lakes, streams, wetlands, intermittent channels, and county/judicial ditches on the Site. The mining operations will not discharge washwater or untreated stormwater from the Site. Washwater will be treated on‐site and recycled. Stormwater will be drained and handled internally. There will be no direct or indirect physical effects or alterations to surface water features. Typically, equipment will be fueled by a fuel service truck. The fuel service truck carries a spill containment kit. If on‐site fuel storage is needed, the fuel storage tank will be an above ground double‐walled tank and will meet all MPCA petroleum storage tank requirements. If tanks with