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On the Need for an Environmental Assessment Worksheet Findings of Fact Bituminous Roadways, Inc. Hot Mix Asphalt Plant Project Conclusions of Law Columbus, Minnesota And Order 12 residents, Anoka County determined that CSAH 54 needed to be re-aligned to provide more distance between its intersection with Lake Drive and the interchange. 67. Anoka County is now planning to realign portions of CSAH 54, including the portion adjacent to the Running Aces Horsetrack, in order to address traffic operations and safety concerns with the transportation network surrounding the I-35/Highway 97 interchange. Anoka County’s project is called the Anoka CSAH 54 (which is also known as West Freeway Drive) Realignment Project (Realignment Project). 68. The MPCA finds that the Project, as Proposed, does not have the potential for significant environmental effects based on the type, extent, and reversibility of impacts related to traffic. Noise Concerns – Project Site 69. The Petitioner states Bituminous’ crushing activities, projected to occur for 3-4 weeks twice per year, will generate noise and vibration, which will harm the health of horses boarded and running at the Running Aces Horsetrack. 70. Bituminous is required to meet Minnesota noise standards in Minn. R. ch. 7030 at the Project site, during construction as well as operation of the Project. Bituminous’ contractor for crushing asphalt and concrete rubble will also be required to meet Minnesota noise standards while operating the portable crushing equipment at the site. 71. Minnesota’s noise standards are based on statistical calculations that quantify noise levels over a 1- hour monitoring period. The L10 calculation is the noise level that is exceeded for 10%, or 6 minutes, of the hour, and the L50 calculation is the noise level exceeded for 50%, or 30 minutes, of the hour. There is not a limit on maximum noise. 72. The statutory limits for noise levels at a residential location are L10 = 65 A-weighted decibels (dBA) and L50 = 60 dBA during the daytime (7:00 a.m. – 10:00 p.m.) and L10 = 55 dBA and L50 = 50 dBA during the nighttime (10:00 p.m. – 7:00 a.m.). This means that during the 1-hour period of monitoring, daytime noise levels cannot exceed 65 dBA for more than 10 % of the time or 60 dBA more than 50% of the time. 73. The basic noise rules for noise area classifications are in the following table. Noise Area Classification Common land use associated with the Noise Area Classification Daytime Nighttime L10 L50 L10 L50 1 Residential housing, religious activities, camping and picnicking areas, health services, hotels, educational services 65 60 55 50 2 Retail, business and government services, recreational activities, transit passenger terminals 70 65 70 65 3 Manufacturing, fairgrounds and amusement parks, agricultural and forestry activities 80 75 80 75