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-� Memorandum to: Kent Peterson Bituminous Roadways October 7, 2010 Page 2 .-. conditions with the asphalt silo and load-out drum in operation and with trucks on-sire loading and hauling asphalt. The results of the noise monitoring fiom the two existing plants are presented in Table I. Wenck recorded the noise levels of a aushing operation during a previous noise monitoring study at a faciliry in New Brighton. The noise level generated by [he crushing operation was 82 dBA at 50 feet (Tabie I) while all crushing equipmen[ was in operation. nuise data from Grove Heights 30 feet away — Between Asphalt Drum and Silo Shakopee 20 feet away - Between Asphalt Monitored Noise r��ra 79.4 The noise levels from the Shakopee plant were used in noise calculations to estimate [he level of noise at the proposed project site to provide a conservative estimate of future noise levels created by the proposed Roseville plant. The monitored noise levels are considered "average" levels and are compared to the MPCA L50 noise limits. The noisc Icvcls at 250 ft inten�als from the proposed location of the asphalt silo and loadout drum on the proposed project sitc are presented in F'igure l. The data displayed in Figure 1 supports the conclusions presented within the EAW that tl�e proposed projec[ will comply with MPCA noise standards at properties adjacent to the project site. Under normal operational conditions, the noise created by the proposed project would range from 39.4 to 57.7 dBA at properties within ihe industrial park (Pigure 1). T'hese values are less than the MPCA Daytime and Nighttime L50 noise standard which are both 75 dBA within industrial areas. Thc nearest residential receptors are located ro the south of the proposed project site, appro�:imately 1,500 feet from the proposed asphal[ silo and load-out drum. Noise levels produced by the proposed project under nornial operating conditions would range from 39.4 to 41.9 dRA within the residential neighborhood south of the project site (Figure I). This is less than the MPCA Daytime L50 residential noise standanl of 60 dBA and also less than [he Nighltime L50 noise standard of50 dRA. The proposed project will also employ a temporary mobile crushing unit nvo times a year for up to a three week period each time. While the normal operations of the asphalt plant will be generally from 6:00 am to 8:00 pm and may include 24-hour operations on some days if required by state highrvaV projects, the operation of the crushing unit will be limited to daytime hours from 7:00 am and 7�00 pm. Wenck recorded the noise levels of a crushing operation during a previous noise moniroring study at a facility in New Brighton. The noise level genera[ed by the T b+ls.ni�ummm R'.i � laic Awn+il.� LlMoise'memo]OIPIPOU Eac