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type of roadway (urban or rural). Table 1 below summarizes the path separation widths from the roadway recommended by the Bikeway Manual. Table 1 Path Se aration from Roadwa Type of Roadway Speed Limit (MPH) Separation 40 or Less 20 ft(desirable) 10 ft (minimum) Rural Section (no curb) 45 or Greater 35 ft (desirable) 24 ft (minimum) Freeway 50 ft (minimum) 30 or Less 5 ft(minimum) 3 ft (minimum, if parking allowed) 35 — 40 5 ft (minimum) Urban Section (with curb) 45 or Greater 10 ft(desirable) 5 ft (minimum) Freeway 50 ft (minimum) � aoie inrormation proviaea ey tne lv�rvl�u 1 liikeway r�acility llesign Manual Other design considerations such as exact horizontal and vertical alignments, geometric design requirements, and horizontal clearances are not able to be determined without completing a topographic field survey. These details will need to be evaluated and included in the final design phase of the project. The timing of the trail construction will be best accomplished when the adjacent roadway is reconstructed. This applies to all segments and in particular the segment of trail from State Highway 51 to County Road E since the roadway may be rebuilt as an urban section instead of a rural section and the trail design can be adjusted to match the proposed roadway. 3.3 Other Considerations Storm water management influences were also considered during the trail study for this corridor. A meeting was held with the Rice Creek Watershed District, and it was determined that a trail project where the paved surface is less than ten feet in width and has a five foot wide minimum vegetated buffer strip will not trigger any water quality or volume control requirements. In any area where the project does not meet those guidelines, that portion of the trail will be required to meet the district's water quality and volume requirements. The Minnesota Pollution Control Agency's (MPCA) permit requirements for construction projects will generally be met with the same practices required by the Rice Creek Watershed District. The vegetated buffer strips that meet the watershed districts requirements will also meet the MPCA's requirements for a majority of the project where the construction of infiltration basins or wet ponds is not feasible. The costs for constructing infiltration basins or wet ponds are not included in this report since the areas that are feasible for their Old Snelling Avenue / Old Highway 10 Trail Study, City ofArden Hills BMI ProjectNo. TL6.100325 Page 3