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GAC Agenda Item 5 - Draft CEAP for Fourmile Canyon Creek Greenways Improvements from 19th to 22end Streets CITY OF BOULDER INFORMATION ITEM FOR: TRANSPORTATION ADVISORY BOARD - Jan. 9, 2012 PLANNING BOARD - Jan. 19, 2012 WATER RESOURCES ADVISORY BOARD - Jan. 23, 2012 PARKS AND RECREATION ADVISORY BOARD - Jan. 23, 2012 OPEN SPACE BOARD OF TRUSTEES - Jan. 25, 2012 ENVIRONMENTAL ADVISORY BOARD --Feb. 1, 2012 GREENWAYS ADVISORY COMMITTEE AGENDA ITEM MEETING DATE: Feb. 15, 2012 SUBJECT: Draft CEAP for Fourmile Canyon Creek Greenways Improvements from 19th to 22°d Streets REQUESTING DEPARTMENT: Anne Noble - Greenways Coordinator Kurt Bauer - Engineering Project Manager Utilities Division Marni Ratzel - Transportation Planner II PURPOSE: A summary of the draft CEAP is being provided to board members as an information item. It is requested you review the full CEAP available on the Greenways webpage under "Current Greenways Projects and Opportunities" and forward any comments or concerns regarding the draft CEAP to your Greenways Advisory Committee representative. If you have questions on this material, please contact Kurt Bauer at 303-441-4232 or BauerK(c,bouldercolorado.gov. The full CEAP is available at: Bouldercolorado.gov > City A-Z > G > Greenways Program > Current Greenways Projects and Opportunities > Fourmile Canyon Creek (19th -22 d Streets) CEAP > CEAP GREENWAYS ADVISORY COMMITTEE ACTION REQUESTED: A recommendation from the Greenways Advisory Committee to City Council concerning the CEAP for the Fourmile Canyon Creek Greenways Improvements from 19th to 22°d Streets is requested. One of the recommended alternatives (emergency access to Tamarack Avenue) will require an amendment to the North Boulder Subcommunity (NoBo) Plan. Amendments to the NoBo Transportation Plan are reviewed and approved by Planning Board and subject to call-up by City Council. Pending GAC approval, Planning Board review of this amendment is scheduled for March 15, 2012. Attached is the Executive Summary from the Fourmile Canyon Creek Greenways Improvements from I9th to 22nd Streets CEAP along with a figure summarizing the proposed recommendations. FOURMILE CANYON CREEK 19" - 22ND STREETS LEAP EXECUTIVE SUMMARY The Fourmile Canyon Creek project from 19th to 22nd Streets is bound by 10 Street on the west, Upland Avenue on the north, 22'd Street on the east and Riverside Avenue on the south. The purpose of the project is to improve safety and accessibility in the area of Fourmile Canyon Creek within the project bounds. Project objectives include the following: • Provide flood improvements at 19`h Street and Fourmile Canyon Creek • Improve emergency access to Tamarack Avenue • Improve pedestrian and bicycle access from 22nd Street to Crest View Elementary School and 19th Street Crest View Elementary School is located at the northwest corner of 19t" Street and Sumac Avenue. During a 100-year storm event, flooding would prohibit safe vehicular access to Crest View Elementary School. In 2009, the city completed a flood mitigation study for Fourmile Canyon Creek and Wonderland Creek. City Council stated the importance of flood improvements at Crest View Elementary School to provide safe vehicular access during a major storm event. Vehicular access to Tamarack Avenue is currently only available by way of 22nd Street from the east. Recent and potential future annexations in the project area allow for subdivision of existing parcels. Future subdivisions will require a secondary access for emergency vehicles to Tamarack Avenue. The North Boulder Sub-community Plan (NoBo Plan) and the Transportation Master Plan (TMP) show a secondary road connection from Upland to Tamarack Avenues along the west property line of 2010 Upland. A multi-use path exists along Fourmile Canyon Creek from Foothills Parkway to 28th Street. The path will be extended in 2012 from 28"' Street to 26th Street through Elks Neighborhood Park along Fourmile Canyon Creek. On-street designated bike routes and small segments of multi-use path exist west of 26th Street to 22nd, The NoBo Plan the TMP and the Greenways Master Plan (GMP) show a conceptual multi-use path connection alignment along Fourmile Canyon Creek from the east end of Riverside Lane at 22°d Street to 19th Street. Project alternatives fall into three categories: 1) flood mitigation alternatives at 19`h Street and Fourmile Canyon Creek, 2) alternatives to provide improved emergency access to Tamarack Avenue, and 3) east-west bicycle and pedestrian connection alternatives. This Community Environmental Assessment Process (CEAP) report presents a comparative evaluation of the following specific alignment alternatives in each category: Flood Improvements • Fl: Replace the existing bridge at Fourmile Canyon Creek and 19th Street with box culverts sized to convey 100-year event flows. • F2: Replace the existing bridge at Fourmile Canyon Creek and 19th Street with box culverts sized to convey 100-year event flows. One of the box culverts would be used as a pedestrian and bicycle underpass. 1 Emergency Access to Tamarack Avenue • EA1: A 20-foot wide paved local access road located within a 30-foot wide right-of-way between parcels 2010 Upland Avenue and 4306 19th Street. This alternative would provide primary emergency access to Tamarack Avenue from Upland Avenue and serve motor vehicle, bicycle and pedestrian traffic in a shared roadway. • EA2: A 12-foot wide paved multi-use path located within a 20-foot wide right-of-way between parcels 2010 Upland Avenue and 4306 19"' Street. This alternative would provide secondary emergency access to Tamarack Avenue from Upland Avenue and also serve non-motorized traffic. • EA3: A 12-foot wide paved multi-use path located within an existing 20-foot wide right- of-way just south of parcel 4270 19th Street. This alternative would provide secondary emergency access to Tamarack Avenue front 19'h Street and also serve non-motorized traffic. East-West Bicycle and Pedestrian Connections • EW 1: A 5-foot wide sidewalk along the north side of Riverside Lane/ Avenue and the cast side of 19"' Street. • EW2: Multi-use path along the north side of Fourmile Canyon Creek. Two subaltematives for this alignment were evaluated: a) a 10-foot wide concrete path b) an 8-foot wide crusher fine path • EW3: A 5-foot wide sidewalk along the north side of Tamarack Avenue connecting to a 10-foot wide concrete multi-use path from the west end of Tamarack Avenue east to 19th St. • EW4: No new connections. Staff Recommendations The following presents staff recommendations based on the draft CEAP review. The attached figure presents a map'showing the recommended alternatives. Flood Improvements The underpass option (F2) for flood mitigation at Fourmile Canyon Creek and 19th Street is recommended. It was overwhelmingly selected as the preferred alternative from responders to public comment and would provide vehicle traffic separation at 19"' Street. Construction of this alternative will require purchase of an easement from 4270 19"' Street. Inproved Emergency Access to Tamarck The 19"' Street to Tamarack Avenue alignment (EA3) is recommended to provide improved emergency vehicle access to Tamarack Avenue. This alternative would consolidate the future bicycle and pedestrian access to Tamarack Avenue with emergency access. It would require enhancing a crossing of Fourmile Canyon Creek to accommodate the weight load of emergency vehicles. Normal vehicular access would not be permitted. By eliminating the proposed north- south access to Tamarack Avenue (shown in the NoBo Plan) just cast of 19°' Street, several properties (4306 Up] and, 2010 Upland and 4270 19th Street) would not be fronted by public access on three sides. This alignment was identified as the preferred alternative by public input 2 responders. Construction of this alternative will require purchase of an easement from 4270 19"' Street. Selection of this alternative will also require an amendment to the NoBo Plan (the current NoBo Plan shows a secondary road access between Upland and Tamarack Avenues just east of 19th Street). The City Transportation and Development Review Divisions agree that a local access roadway providing full (non-emergency) vehicular access is not warranted based on current and projected traffic volumes generated by potential future subdivisions along Tamarack Avenue. East-West Bicycle and Pedestrian Connection The 10-foot wide concrete path alignment along Founnile Canyon Creek (EW2a) is recommended for the east-west connection. This alignment is shown in the NoBo Plan, TMP and the GMP. Public input identifies this alignment as the first choice connection alternative. It is the only alternative that provides motor vehicle separation for both cyclists and pedestrians and is therefore the safest alternative. The hard surface would be maintained by the City of Boulder to a transportation standard. It would be plowed in the winter, providing year-round access to school children and bicycle commuters thereby meeting goals of promoting walking and bicycling for both the Boulder Valley School District and the city and it provides the best user experience. The GMP identifies a multi-objective program that integrates numerous activities, needs and community resources. The objectives include: • Protect and restore riparian, floodplain and wetland habitat • Enhance water quality • Mitigate storm drainage and floods • Provide alternative modes of transportation routes or trails for pedestrians and bicyclists • Provide recreation opportunities • Protect cultural resources The GMP divides each tributary into reaches to facilitate a manageable implementation approach for improvements. An inventory of each reach was completed to identify existing conditions and future opportunities for project-based improvements. The GMP also ranked each of the six Greenways objectives for each stream reach for the purpose of balancing conflicting interests at the time a project is being undertaken. Each objective was given a low to high rank based on specific criteria outlined in the Master Plan. For this reach of the Founnile Canyon Creek, the transportation and recreation objectives ranked high, recognizing the relationship of this reach to Crest View Elementary School and nearby parks. Habitat restoration ranked medium in this reach, based on the average ranking of the existing habitat and the ability to easily replace and enhance the existing vegetation. Recommended alternative EW2a best meets the transportation and recreation objectives of the GM P. As part of the recently completed environmental assessment, ERO Resources Corp. (project environmental consultant) found virtually no wetlands in this stream reach and no suitable habitat for threatened and endangered species. The specific alignment along the north side of the creek was determined by ERO Resources in an effort to minimize impacts to mature and native riparian vegetation and to avoid inner wetland buffer and avoid and/or minimize encroachment into the outer wetland buffer zone as defined by the city's Streams, Wetlands and Water Body 3 Ordinance. City staff acknowledges that while urban species are tolerant to human presence and the addition of this path connection will not eliminate species, there could be wildlife impacts through the reduction in number of animals as a result of this project. The project would include a habitat restoration component. Vegetative habitat impacts can be mitigated and enhanced through planting native vegetation. In addition, if there is a path in the riparian corridor, the city's Greenways Habitat crew assumes responsibility for control of invasive species thereby enhancing the overall habitat. The EW2a alternative will require purchase of a public access easement from 2020 Upland Avenue to construct the path. While the property owner has expressed no current interest in selling an easement for the path connection, the EW2a alignment is the best ultimate alignment and is the recommended preferred alternative. Until securing an easement, the city proposes to complete the proposed east-west multi-use path connection from the west end of Tamarack Avenue to 19'x' Street. 4 Summary of Recommended Alternatives 7385'' 1917 1937 20)5 2075 2705 't i. 2125 1=ourmile Canyon Creek Centerline R ~ _ ~ F ~ 15 r _ A AV P rr, it f - - Wetland Bounds/Buffers -Property Lines N Bridge with Pedestian Required Easements Bicycle Underpass AF2: ,~.+.~s~ 2fli0r`'~ 2D9© 2110` 2130 - - Unannexed Parcels ' - - EA3 12 ft Concrete Multi-Use Path ; and Emergency Access • 4 k 4 429,1 1897 Segment of Tamarack Aue. 2190 -d N Sidewalk Connections Currently Under Construction EW2a: 10 ft Concrete z hq, r17~ Multi Use Path o• ~ ~ ~ ~ r „2020 k i r ~ , r 1♦ ~ : i r>~ `r ` : v~ y213rJ 214Q4+ it 72155' CYT • 4f 0 2192 L C. r• 1F1 +r;t i' 2220' ~i '4220 •-e ,+t'y •-w- 1 'r! r0 1!98 "'r Ors T WJIT I 4190r Ea0 13~0r ei84 .r" ar _ 2015 - - ` 5 1965 1967" ~ ` L 21 F r 4180' r _ 2088 1l F' 2446 ,r. r, • f a 2D3D r 2100 ~18t0 4757' f 1950 ~.ai'LR''•=iii-fi. 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