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HomeMy WebLinkAboutEngineering Comments 06-20-2020MEMORANDUM ------------------------------------------------------------------------------------------------------------ TO: Sarah Rosenberg, Planner II FROM: Anna Russell, Engineer II RE: West Side Flats Concept Review Application No. 19509 DATE: January 10, 2020 ----------------------------------------------------------------------------------------------------------- ENGINEERING COMMENTS: The following are high-level comments identified with the information provided with this submittal. The applicant is advised additional corrections may apply to the proposed project after Site Plan submittal. Applicant Questions 1. Before continuing further with site design development, we would like to confirm that the placement of the buildings, site vehicular circulation and parking is acceptable with Planning and Engineering Staff. Answer: Engineering is in support of the vehicular circulation and 90 degree parking. The applicant must include a public access easement through the drive way and to each street (Dragon Fly and May Fly) to allow for pedestrian connectivity. 2. We would like to identify all infrastructure improvements both on and off the site that will be required to complete the project. Answer: On site –A 30 foot easement is required for water and sewer mains. No structures can be located within 10 feet of mains and each main should be located at least 9 feet from the edge of the easement. Off site –The City provides access to a GIS website showing existing public water, sewer, and storm drain infrastructure. See https://gisweb.bozeman.net/Html5Viewer/?viewer=infrastructure Water: An 8” ductile iron water main is located in Fallon Street and a 12” ductile iron water main is located in W Babcock Street. There are also water mains extending to the western property boundary at Dragon Fly Street and May Fly Street. There is currently no known capacity restriction to serve this lot. A Water Design Report is required with the Site Plan application, signed and stamped by a licensed Civil Engineer in Montana. Sewer: There is a sewer main located at the property boundary on Dragon Fly Street. That sewer main directs flows to the Norton Ranch Sewer lift station. The applicant will need to verify that this lot was originally allocated capacity at the Norton Ranch Lift Station. There is currently a limited amount of sewer capacity available at the lift station and it will require pump upgrades prior to adding any flows. More information can be found in the Design Report for the Norton Ranch Sewer Lift Station. In addition, wastewater is pumped from the Norton Ranch Lift station via the force main into the Baxter Meadows Lift station. Currently, the Baxter Meadows Lift station is fully allocated and does not have the capacity to accommodate an increase in sanitary sewer flows from the Norton Ranch lift station. The applicant may perform an analysis on whether it’s feasible to allow the project flows from the Norton Ranch lift station to the Baxter Meadows lift station. There is an 8” sewer main is located in Automotive Drive with an 8” sewer stub located on the west side of Automotive Drive about 80 feet north of the property boundary for Lot 2. No connection can be made under Baxter Creek to Automotive Drive due to the shallow cover over the main under the creek. There are no sewer mains to service this property on either Fallon Street or W Babcock Street. A Sewer Design Report is required with the Site Plan application, signed and stamped by a licensed Civil Engineer in Montana. Roadway: Additional easements for Fallon Street and Babcock Street may be required if the ROW for the street classification width does not already exist. Trails: A trail with a 30 foot easement will be required to connect to the existing trail through the property to the east. General Comments 1. If not already filed for the subject site, the applicant will need to provide and file with the County Clerk and Recorder's office executed Waivers of Right to Protest Creation of Special Improvement Districts (SID’s) for the following: a. Street improvements to Fallon Street from N Laurel Parkway to N Cottonwood Rd including paving, curb/gutter, sidewalk, and storm drainage b. Street improvements to W Babcock Street from N Laurel Parkway to N Cottonwood Rd including paving, curb/gutter, sidewalk, and storm drainage c. Intersection improvements to North Cottonwood Road and W Babcock Street d. Intersection improvements to North Cottonwood Road and Fallon Street The document filed must specify that in the event an SID is not utilized for the completion of these improvements, the developer agrees to participate in an alternate financing method for the completion of said improvements on a fair share, proportionate basis as determined by square footage of property, taxable valuation of the property, traffic contribution from the development, or a combination thereof. The applicant must provide a copy of the filed SID waiver prior to Site Plan approval. Sewer 1.DSSP (Design Standards and Specifications Policy) V.B.3. The applicant must submit an estimate for peak-hour and average daily sewer flow generated by the project with the Site Plan application. Sewer flows will be directed from this lot to the Norton Ranch Lift Station. There is currently a limited amount of sewer capacity available for this site at the lift station. The Norton Ranch Lift Station will need to be upgraded to service this project. There may also be sewer main pipe restrictions further downstream of the lift station. Further information can be provided with a sewer demand quantity. C&H Engineering is in the process of designing an upgrade to the Norton Ranch Lift Station to accommodate the proposed flows from this project and future Phases of Norton Ranch. This design report will be submitted to the City for review in the following weeks when it is complete. A estimate for the peak and average sewer flow from this proposed project is included with this submittal. Easements 2.BMC 38.410.060.C.1 Easements. The water and sewer mains require a 30 foot Public Utility easement. Draft of Easement Exhibit is included for review 3.BMC 38.410.040.B Blocks. Block length must not be more than 400 feet in width; a 30 foot public access easement will be required with the Public Utility Easement north and south to be included with the Public Utility easement. Draft of easement exhibit is included for review Water 4.BMC 38.4100.0130.A Water Rights. The applicant must contact Brian Heaston with the City Engineering Department to obtain a determination of cash-in-lieu (CIL) of water rights. CILWR must be paid prior to building permit approval. Storm Drainage 5.BMC 40.04.700.A.4.a Requirements. Runoff from untreated snow storage cannot be discharged offsite. Ensure the snow storage areas slope to areas that are treated. In general snow storage areas will drain to adjacent retention ponds. 6. A stormwater maintenance plan must be provided with the Site Plan Application. Included Dry Utilities 7.BMC 38.410.060.B.2.b Easements - 10 foot utility easements are required for dry utilities on the Site Plan submittal. Contact Dylan Swanson with Northwestern Energy for utility easements – dylan.swanson@northwestern.com, 406-497-3663. A draft of the proposed utility easement exhibit is included for review Fire 8.BMC 38.400.010. Dead-end streets and alley – Phase 2 will require a fire truck turnaround. Drive aisles cannot exceed 150 feet in length without a turnaround. When the phase 2 site plan is submitted either a fire truck turnaround will be added at the north end, or a gravel drive will connect the end of phase 2 parking to Dragon Fly Street 9. Add a fire hydrant near the line between phase 2 and phase 3. A fire hydrant has been added near this location Transportation 10.BMC 38.400.020. C.3.b. Drive Access Requirements. The connection to Dragon Fly and May Fly Streets must utilize standard commercial drive approaches. The approaches must narrow from the street section to a drive approach with a maximum 35 feet wide with sidewalks on both sides - BMC 38.400.080.A Sidewalks. Non-Residential drive approaches are proposed at the ends of May Fly Street and Dragon Fly street. The access drives inside the site at the end of these streets will be 26’ wide. 11.BMC 38.410.040.D Rights-of-way for pedestrians. Thirty foot Public Access easements are required for the two east/west trails through the property from May Fly Street and the open space lot between May Fly Street and Dragon Fly Street. The easements may not contain parking stalls or structures within them. The easements will extend north and south to encompass the proposed trail. These easements have been incorporated into the proposed design. The easement from the open space lot between May Fly and Dragon Fly will have a trail extended through it, and the easement north of May Fly will have a sidewalk that connects to the sidewalk in the adjacent open space lot. 12.BMC 38.410.100.A.2.e.(2).(c) Watercourse Setbacks. No trail can be located within zone 1 unless it’s a spur trail or crossing the zone. The trails have been removed from zone 1 of the watercourse setback to the greatest extent possible. The portions of the trail that are still proposed to cross through zone 1 will follow the exception noted in BMC 38.410.100.A.2.e.(2).(c). For every 500 LF of watercourse no more than 150 LF of the adjacent trail (300% of 50’ watercourse setback) will be located within zone 1. In total 240 LF of trail are proposed within the Zone 1 setback. 13.BMC 38.520.040.C.5 Non-motorized circulation and design. The northern portion of the trail must be aligned on the south side of Babcock Street across from the existing trail located on the north side of Babcock on Lot TR.2. of the Valley West subdivision. The applicant will need to install a pedestrian crossing, signs, and curb paint. The type of crossing (RRFB (Rectangular Rapid Flash Beacon) or HAWK (High-Intensity Activated crosswalk) beacon) should be defined by the traffic impact study. Reuben: Lets discuss this. I was not aware that the need for a HAWK or RRFB was a comment, I must have missed it on the first review. But C&H doesn’t design these pedestrian signals. We are in the process of designing one on a similar project and sub-contracted Sanderson Stewart to do the work on the signal. I would recommend that we submit the site plans with the crosswalk shown and include a comment similar to the below answer. I did discuss the trail connection to Babcock with Addi and we agreed that it could be located west of the creek as I state below. “The trail alignment was discussed with Addi in the parks department and it was decided that since moving the trail to the east side of the creek would impact a significant amount of wetlands, the trail could remain on the west side of the creek north of the bridge. The trail will connect the Babcock Street Sidewalk west of the creek and the crossing will be located on the east side of the creek in alignment with the existing trail on the north side of Babcock Street. Design of the signal is underway. We understand that the site plan will not be approved until plans for the signal have been submitted and approved.” 14. BMC 38.520.040.C.5 Non-motorized circulation and design. Relocate the existing bridge crossing Baxter Creek south to align with the trail connection at the Open Space lot of the Norton East Ranch Subdivision. The bridge was discussed with Addi in the Parks Department and it was decided that the Bridge could remain in its current location.