6.1. SR 03-17-2003 - Laserfiche WebLink

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water and PM from the aggregate. Baghouses will be utilized on the asphalt plant to control fugitive particulate emissions. Baghouses are designed to filter fine particles through the use of fabric. Particles will be caught on the surface of the bags, leaving clean flue gas to pass through. Bags will be cleaned periodically as dust layers build up to minimize pressure drop. Captured dust from these devices will be returned to the production process. MPCA Air Quality Permits are required for sand and gravel mining operations and asphalt plants depending on the size of the operation and the "potential to emit." The Conditional Use Permit documents will indicate the need for air quality permits. Potential to emit calculations will be performed and the proper permits will be obtained. 24. Odors, Noise and Dust: Will the project generate odors, noise or dust during construction or during operation? X Yes No -If yes, describe sources, characteristics, duration, quantities or intensity and any proposed measures to mitigate adverse impacts. Also identify locations of nearby sensitive receptors and estimate impacts on them. Discuss potential impacts on human health or quality of life. (Note: fugitive dust generated by operations may be discussed at Item 23 instead of here.) Odors, noise and dust will be generated when mining and crushing activities are being conducted. Crushing operations will only be conducted using a portable crusher a few times per year. Aecording to information in the 1994 EIS, noise levels in the Mining District have not been shown to exceed MPCA noise standards. Standard mining equipment and portable asphalt producing equipment will be used for the mining operation which will have decibel (dBA) levels that are similar to those measured for the 1994 EIS. Therefore, noise levels should be within allowable standards for the project. Any nuisance noises will be minimized by limiting hours of operation. Selected placement of gravel stockpiles can also be used to control noise. On-Site generators may be housed in trailers or other temPorary structures to minimize noise, if necessary. Additional mitigative measures for noise will also include proper equipment maintenance and muffling. Mining operations be conducted between the hours of 7:00 AM and 7:00 PM as required by the City of Elk River. The specific hours of operation will be determined at part of the Conditional Use Permit. Dust generated during mining operations will be limited to the active mining area and haul roads. Water will be delivered to the Site via a water truck and applied primarily to haul roads, but also to any exposed soil/topsoil stockpiles and areas where mining has been completed as is necessary. Mitigative measures to minimize fugitive dust from these areas may include of stockpiling soils in a maturer to prevent erosion and phased restoration of completed areas. Additionally, paving 100 feet of the approach to Trunk · Jan-2003 · LIESCH ASSOCIATES, INC. Hydrogeologists · Engineers - Environmental Scientists · Page 18.