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�. Memorandum to: Kent Peterson Bituminous Roadways October 7, 2010 Page 3 crushing operation was 82 dBA at 50 feet (Table I) while all crushing equipment was in operation. The noise genera[ed by [he crushing operation (Table I) was added ro the noise levels monitored at the existing Shakopee plant to estimate the total noise generated from the proposed project when the mobile crushing operation is present on site. The noisc levels at 250 ft intervals from the center point of proposed location of [he asphali silo/load-out drum and the mobile crushing opera[ion arc presented in Figure 2. The data displayed in Figure 2 suppons the conclusions presented within the 6A W that [he proposed project would be able to comply with MPCA noise standards during crushing opera[ions. The noise Icvels generated during crushing operations will range from 50.3 to 68.4 within the industrial park (Figure 2}. These levels are less than the MPCA Da�nime L50 noise standards for industrial areas of 75 dBA. The noise levels generated by the proposed project will range from 52.8 to 503 within the residential areas south of the project site (Figure 2). These levels are below the MPCA Daytime L50 noise standards for residential areas of 60 dBA. Noisc Monitoring of Esisting Conditions ln response to comments on the FA W requesting additional information on existing noise levels near the proposed project site, noise monitoring was conducted. On September 14°i, 2010 noise � monitoring was conducted at four lucations near the proposed project site. There were two noisc monitoring locations within the industrial park. Monitoring location tl I was located wesi of the project site near the western edge of the indus�rial park and location N2 was located noriheast of the project site near the railroad tracks and the Old Dutch Potato Chip factory. There were also avo monitoring locations within Ihe residen4al area south of the proposed project site. Moni[oring location # 3 was at the end of Eustis Court immediately south of 1-351�� and location �14 was along St. Croir Street in the middle of the block, further away from the highway Ihan location # 3. All four noise monitoring locations are presented in Figure 3. Noise levels were recorded using Ques[ 300 noise docime[ers. The meters were placed on trip«is at each location at approximately five aod a half feet off the ground to record the noise at human ear level (see Attachment A) The normal operations a[ [he proposed plant will take place &om G:00 am to 8:00 pm but could occasionally include 24-hour npera[ions if required for state highway projects. The MPCA noise standards are broken out into Daytime (from 7:00 am to 10:00 pm) and Nighitime (fiom 10:00 pm to 7:00 am) standards. Noise monitoring began at each location prior to 6:00 am in order to collect a minimum of one full hour of noise duta during nighttime conditions (6:00 am to 7:00 am). Noise monitoring continued through at least 5:00 pm at all locations. l'his allowed for the calculation of L50 noise levels at each monitoring location during nighttime levels but also during morning, midday and afternoon/evening traffic and noise pattems. T'.aI!-Bnum.w�e R�I I]009 Pe�e.'Jle fll�NOnf�iy-]CI P�.0.06dof `�