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generators may be housed in trailers or other temporary structures to minimize noise, if <br /> necessary. Additional mitigative measures for noise will also include proper equipment <br /> • maintenance and muffling. <br /> 3.7 HOURS OF OPERATION <br /> Mining operations be conducted between the hours of 7:00 AM and 7:00 PM, Monday through <br /> Saturday. <br /> 3.8 EXPLOSIVES <br /> No explosives will be used at the Site. <br /> 3.9 DUST AND ODOR <br /> Dust generated during mining operations will be limited to the active mining area and haul roads. <br /> Water will be delivered to the Site via a water truck and applied primarily to haul roads, but also <br /> to any exposed soil/topsoil stockpiles and areas where mining has been completed as is <br /> necessary. Additionally, paving 100 feet of the approach to Trunk Highway 169 may be <br /> considered to reduce dust. Fugitive dust generated from the asphalt plant operations will be <br /> addressed through the use of baghouses. <br /> • The proposed asphalt plant is the primary source of odor for the project. Odors will be <br /> controlled and minimized by engineering and designing the appropriate stack height for the <br /> operation. The use of recycled asphalt in the plant operation will also be limited, thus reducing <br /> some of the nuisance odors. Hours of plant operation will be adjusted as needed based on <br /> weather conditions and/or periods of inversion. <br /> 3.10 POLLUTION CONTROL <br /> At this time, there will be no permanent above or below ground storage tanks located at the Site. <br /> Temporary or portable aboveground tanks will be used store fuels. If storage will exceed 1,320 <br /> gallons, a Spill Prevention Control and Countermeasure (SPCC) Plan meeting the requirements <br /> of 40 CFR Part 112, will be prepared and implemented for the Site. In addition, all tanks will be <br /> registered with the MPCA. MPCA Air Quality Permits are required for sand and gravel mining <br /> operations and asphalt plants depending on the size of the operation and the "potential to emit." <br /> Potential to emit calculations will be performed and the proper permits will be obtained. <br /> Additionally, as required by the MPCA, a National Pollutant Discharge Elimination System <br /> (NPDES) Permit for storm water will be obtained and a Storm Water Pollution Prevention Plan <br /> (SWPPP) will be completed for the Site. <br /> i <br /> LIESCH ASSOCIATES,INC. <br /> January 2003 Hydrogeoloa sts Engineers•Environmental Scientists •Page 7• <br />