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Amended Aoplicable Code (Proposed): City of Arden Hills Code of Ordinances — Section 1380 Attachment #2 Palette of Open Space Types, Table "Typical Characteristics" "g) Multi -use trail through neighborhoods: Paved trail with frequent gathering spaces and regular landscaping. Standards - Min. Width 12 feet" Multi -use trail along Spine Road (Rice Creek Boulevard): Paved trail with frequent gathering spaces and regular landscaping. Standards - Min. Width 10 feet" Practical Difficulty of meeting TRC (Current Applicable Code): Rice Creek Watershed District Requirements: The Rice Creek Watershed District Rules provide an exception which excludes stormwater treatment volume requirements for any trails that are 10 ft or less that are also bordered by down -gradient vegetation or vegetated filter strip of at least 5 ft (Rule CStormwater Management, 12 Exceptions (b)). The Rice Creek Boulevard right-of-way contains adequate space for a vegetated filter strip for the project to take advantage of this exception. Construction of 12-foot trails would require the project to apply the regular treatment standards as described Under Rule 6 of the Watershed District Rules for the entirety of the 12-feet of impervious surface created by the trail. The requirement stipulates 1.1-inches of treatment volume over new impervious surfaces. This results in additional 1,100 cubic yards of required stormwater treatment volume. Cost Implications: The construction of the additional trail width results in additional project construction costs for the additional trail width and stormwater treatment volume. Sufficient space does exist within the Natural Resources Corridor to provide the treatment volume; however, it does reduce capacity for future developments within Rice Creek Commons. A summary of those impacts is provided below: Estimated Cost for Additional Trail Width: $500,000 Estimated Cost forAdditional Stormwater Treatment: $125,000 Additional Treatment Volume Required: 1,100 CV Acreage needed forAdditional Treatment Volume: 0.40Acres Design Standards/Justification for Proposed Code Amendment: County Precedence: Ramsey County has a general precedence that shared use paths and trails are built to a standard width of 8ft when running adjacent to County roadways and 10ft where disconnected from adjacent roadways. The adjacent 'Rice Creek North Regional Trail' is constructed to a 10-foot width. City Standards: For trail located outside of Rice Creek Commons, the City of Arden Hills standards for multi- use trails call for a minimum 8-foot width. The applicable language within the Arden Hills Public Works Design Manual (Draft), Street Section, Item 19 states: Kimley >>> Horn