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Project Name and/or Number: Centerville Road and Birch Street Turn Lane Project Attachment C Avoidance and Minimization Project Purpose, Need, and Requirements. Clearly state the purpose of your project and need for your project. Also include a description of any specific requirements of the project as they relate to project location, project footprint, water management, and any other applicable requirements. Attach an overhead plan sheet showing all relevant features of the project (buildings, roads, etc.), aquatic resource features (impact areas noted) and construction details (grading plans, storm water management plans, etc.), referencing these as necessary: The purpose and need for the project is discussed in Part Three of this application. The city proposes to construct turn lanes and extensions onto the fire station road which is being constructed as part of the proposed Fire Station project. The west access will be approximately 330 feet south of the intersection of Centerville Road and Birch Street. The east access will be located approximately 900 feet west of the intersection. Both road extensions will include turn lanes and a bypass lane will be included at the Birch Street/fire station road intersection as well. Birch Street is defined as a Major Collector with a speed limit of 55 mph. Anoka County's guidelines require 300 feet of stacking distance and a 1:15 taper for turn lanes between intersections. The distance between the proposed temporary entrance to the fire station and the intersection for the extension of the fire station road has been designed to provide this (approximately 480 feet). In addition, the placement of the intersection was set to avoid impact to a larger wetland located to the east. A shift of the intersection to the east or west would not eliminate wetland impacts. A shift of the intersection to the east would result in the project having impacts on four, rather than three, wetlands. Centerville Road is classified as a Minor Arterial and has a speed limit of 50 mph. Conditional secondary intersections (right -in, right -out) are allowed at a distance of between 300 — 660 feet from the Birch Street/Centerville Road intersection. The intersection to the fire station road is located approximately 330 feet from the intersection. The wetland located within that area (Wetland B) extends from approximately 100 feet north of the proposed intersection and continues for several hundred feet south. Shifting the intersection either north an additional 30 feet or south would not result in any reduction in wetland impact. Anoka County Highway Department Access Spacing Guidelines Roadway Type Route Speed (MPH) Intersection Spacing (Nominal4t) Signal Spacing Private Access I's Full Movement Intersection Conditional Secondary Intersection r:r Principal Arterial 50 - 55 1 mi. 112 mi. 1 mi. Subject to conditions for all roadway types and speeds 40 - 45 112 ml. 114 mi. 112 mi. < 40 118 mi, 300 - 660 feet 114 mi. Arterial Expressway 50- 55 1 mL 1/2 mi. 1 mi. Minor Arterial 50 - 55 112 mi. 114 mi. 112 mi. 40 - 45 114 mi. 1/8 mi. 114 mi. <40 118 mi. 300 - 660 feetc3' 1/4 mi. Collector and Local 50 - 55 1/2 mi, 1/4 mi. 1/2 mi. 40-45 118 mi. NIA 114 mi. <40 1/8 mL 300 - 660 feet(') 1)8 mi. Specific Access Plan By adopted plan/agreement/covenant on land (1) Private access refers to residential, commercial, industrial and institutional driveways. Reference Anoka County's Development Review Manual for specifics on private access. (2) Conditional secondary access is defined as right-inlout. (3) Access spacing may be determined by planning documents approved by the county (e.g., Lino Lakes I -35E AUAR) (4) Any spacing deviations shall have a detailed traffic study completed by the requesting agency, AND approved by the County Engineer. Information regarding the design of each turn/bypass lane is included in Part Four, within the description of each wetland impact.