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<br /> <br />Practical Difficulty of meeting TRC: <br /> Rice Creek Watershed District Requirements: <br />The Rice Creek Watershed District Rules provide an exception which excludes stormwater <br />treatment volume requirements for any trails that are 10 ft or less that are also bordered by <br />down-gradient vegetation or vegetated filter strip of at least 5 ft (Rule C Stormwater <br />Management, 12 Exceptions (b)). The Rice Creek Boulevard right-of-way contains adequate <br />space for a vegetated filter strip for the project to take advantage of this exception. <br />Construction of 12-foot trails would require the project to apply the regular treatment <br />standards as described Under Rule 6 of the Watershed District Rules for the entirety of the <br />12-feet of impervious surface created by the trail. The requirement stipulates 1.1-inches of <br />treatment volume over new impervious surfaces. This results in additional 1,100 cubic yards <br />of required stormwater treatment volume. <br /> Cost Implications: <br />The construction of the additional trail width results in additional project construction costs <br />for the additional trail width and stormwater treatment volume. Sufficient space does exist <br />within the Natural Resources Corridor to provide the treatment volume; however, it does <br />reduce capacity for future developments within Rice Creek Commons. A summary of those <br />impacts is provided below: <br />Estimated Cost for Additional Trail Width: $500,000 <br />Estimated Cost for Additional Stormwater Treatment: $125,000 <br />Additional Treatment Volume Required: 1,100 CY <br />Acreage needed for Additional Treatment Volume: 0.40 Acres <br />Design Standards/Justification: <br /> County Precedence: <br />Ramsey County has a general precedence that shared use paths and trails are built to a <br />standard width of 8ft when running adjacent to County roadways and 10ft where <br />disconnected from adjacent roadways. The adjacent ‘Rice Creek North Regional Trail’ is <br />constructed to a 10-foot width. <br /> City Standards: <br />For trail located outside of Rice Creek Commons, the City of Arden Hills standards for multi- <br />use trails call for a minimum 8-foot width. The applicable language within the Arden Hills <br />Public Works Design Manual (Draft), Street Section, Item 19 states: <br /> <br />“When trails are proposed, trails shall be constructed of bituminous with a minimum width <br />of 8-feet and minimum thickness of 3-inches with an aggregate base thickness of 6-inches.” <br /> <br /> <br /> <br /> <br />