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HomeMy WebLinkAboutPOUDRE RIVER WHITEWATER PARK (FORMERLY POUDRE RIVER DOWNTOWN PARK) - PDP - PDP160039 - SUBMITTAL DOCUMENTS - ROUND 2 - MODIFICATION REQUESTRequest for Modification of Street Standards Poudre River Whitewater Park Project Preliminary Development Plan December 6, 2016 Revised January 31, 2017 Vine Drive is currently classified as 2-lane arterial street and it is our understanding that it will be downgraded to a collector once the construction of Suniga Drive and the relocation of Lemay Avenue for the separated BNSF railroad crossing has been constructed. As a result, the project team conducted extensive outreach with City staff and adjacent property owners during the initial phases of the preliminary design to identify the typical road cross section that would be utilized for this project. The proposed cross section that was agreed upon with input from the Engineering and Transportation Departments is a hybrid of the standard arterial and collector street sections and includes the following: • Travel lanes : a 3-lane section with 11 ft through/turn lanes • Bike lanes : 8 ft wide bike lanes (5 ft bike lane with 3 ft buffer) • Parking lane: 8 ft parallel parking lanes • Parkway : 8 ft parkway • Sidewalk: 6 ft detached walk The proposed typical cross section for Vine Drive along the project’s frontage is identified on the attached figure, which was presented at the project’s neighborhood meeting in October as required by the PDP process. Since this cross section does not meet current standards, this variance request is being submitted for the attached cross section to be adopted for the portion of Vine Drive between College Avenue and approximately 240-feet east of Jerome Street, where the street improvements associated with the Inverness/Innosphere development terminated. Furthermore, as shown on the attached figure, the project is requesting a variance for the meandering of the sidewalk along the eastern and western portions of the project site. The meandering of the sidewalk is being proposed to reduce the impact to, and potential removal of, existing trees along this frontage. In addition, the project is proposing the construction of a temporary attached asphalt sidewalk and 24-foot wide shared driveway for the two private parcels that lie within the project boundaries with the understanding that the temporary sidewalk will need to be reconstructed as a detached walk when the future development/change of use of these properties takes place. The current project includes improvements to approximately 800 feet along the south edge of Vine Drive. The south side of the roadway will be expanded south to accommodate the bike lane/buffer. The existing road surface from the street centerline to southern edge of asphalt is adequate for accommodating the east bound travel lane and half of the center turn lane. Since this project will be retrofitting a relatively small portion of Vine Drive, the roadway design is constrained by existing elevations along all four boundaries. Constraints around the roadway improvement perimeter make it physically impossible to meet the project’s goal of directing stormwater runoff from the road into the adjacent Coy Pond for water quality treatment, while maintaining the minimum required 0.5% gutter flowline grade. All efforts have been made to maximize the gutter flowline grade; even so, the proposed gutter flowline grade varies from 0.85% to 0.33%. The proposed gutter flowline has been designed to provide positive cross slope drainage to the gutter. It is noted that the proposed cross slopes of the roadway design are less than the 1.5%-2.0% required for reconstruction and new roadways. However, the required cross slopes can be obtained by a future overlay, or when additional improvements to Vine Drive are implemented. Due to the physical constraints imposed by the existing roadway, a variance is respectfully requested to allow these deviations from City street design criteria. 15' 15'