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Memorandum to: Kent Peterson Bituminous Roadways October 7, 2010 Page 3 crushing operation was 82 dBA at 50 feet (Table 1) while all crushing equipment was in operation. The noise generated by the crushing operation (Table 1) was added to 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 noise levels at 250 ft intervals from the center point of proposed location of the asphalt silo /load -out drum and the mobile crushing operation are presented in Figure 2. The data displayed in Figure 2 supports the conclusions presented within the EAW that the proposed project would be able to comply with MPCA noise standards during crushing operations. The noise levels 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 Daytime L50 noise standards for industrial areas of 75 dBA.. The noise levels generated by the proposed project will range from 52.8 to 50.3 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. Noise Monitoring of Existing Conditions In response to comments on the EAW requesting additional information on existing noise levels near the proposed project site, noise monitoring was conducted. On September 14 2010 noise monitoring was conducted at four locations near the proposed project site. There were two noise monitoring locations within the industrial park. Monitoring location #1 was located west of the project site near the western edge of the industrial park and location #2 was located northeast of the project site near the railroad tracks and the Old Dutch Potato Chip factory. There were also two monitoring locations within the residential area south of the proposed project site. Monitoring location 3 was at the end of Eustis Court immediately south of 1 -35W and location #4 was along St. Croix Street in the middle of the block, further away from the highway than location 3. All four noise monitoring locations are presented in Figure 3. Noise levels were recorded using Quest 300 noise docimeters. The meters were placed on tripods at each location at approximately five and a half feet off the ground to record the noise at human ear level (see Attachment A) The normal operations at the proposed plant will take place from 6:00 am to 8:00 pm but could occasionally include 24 -hour operations if required for state highway projects. The MPCA noise standards are broken out into Daytime (front 7:00 am to 10:00 pm) and Nighttime (from 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 data during nighttime conditions (6 :00 am to 7:00 am). Noise monitoring continued through at least 5:00 pm at all locations. This 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 patterns. T 0425 -D 9m, no. s RU 1 1009 Roseville CiJ NoorNmemo- 2010.100.06 dot