Agenda - Council - 06/25/2013 - Laserfiche WebLink

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Enterprise Park to Crooked Lake 115 kV Transmission Line March 2012 Environmental Assessment 0.0001 ppm at one meter above ground level. (United States Department of Energy, BPA) For both cases, the ozone levels are below federal standards. Studies designed to monitor the production of ozone under transmission lines have been unable to detect any increase attributable to the transmission line facility. There would be limited emissions from vehicles and other construction equipment and fugitive dust from right-of-way clearing during construction of the Project. Temporary air quality impacts are expected to occur during this phase of activity. The magnitude of emissions is influenced heavily by weather conditions and the specific construction activity taking place. Exhaust emissions from primarily diesel equipment would vary according to the phase of construction but would be minimal and temporary. Adverse impacts to the surrounding environment would be minimal because of the short and intermittent nature of the emission and dust -producing construction phases. The Project is not anticipated to result in any permanent impacts on air quality. Mitigation Measures — Air Quality As a standard HVTL Permit condition, construction activities must follow best management practices (BMPs) to control air emissions (fugitive dust). Petroleum based dust suppressants may not be used. Construction vehicles with excess tailpipe emissions would not be operated until repairs to the vehicle could be made. The disturbed area for each route would be minimized. As there are no significant impacts to air quality anticipated, no mitigation beyond these BMPs are proposed. 5.2.2. Soils and Geology The topography of Anoka County is the result of glacial deposition. The area is characterized as level to gently rolling. The elevation ranges from approximately 829 to 899 feet mean sea level. The topography of the Proposed Route is nearly level except for some elevated road crossings and the floodplain of the Rum River. The Anoka Sand Plane Subsection has exposed bedrock in the St. Cloud area. In other areas, surface deposits are generally less than 200 feet deep. Bedrock consists of Cambrian and Ordovician dolomite, sandstone, and shale. The Hubbard-Nymore formation makes up a large portion of the soil types in the Project area. This soil association is mainly a level to gently sloping outwash plain that is dissected by drainageways and pitted by large depressions. Steeper slopes occur next to these larger depressions and drainageways. Hubbard soils have a black and very dark grayish -brown coarse sandy surface layer about 20 inches thick. The subsoil is dark - brown and yellowish -brown coarse sand. The underlying material at a depth of about 44 inches is yellowish -brown sand. Nymore soils typically have a surface layer of very dark gray and black to very dark grayish -brown loamy sand about 2-8 inches thick. The subsoil is dark -brown loamy sand. The underlying material at a depth of about 26 inches is yellowish -brown sand. 43