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Home My WebLink About002 Engineering Review Comment Response March 28, 2022 Mikaela Schultz, Engineer I City of Bozeman Engineering Department P.O. Box 1230 Bozeman, MT 59771-1230 Re: Boulder Creek Apartments Site Plan Application (#21288) MMI#: 4192.025 Dear Mikaela: This letter is to provide written responses to the comments stated in the concept plan review memo dated August 31, 2021. Below are our responses associated with each comment. General 1. BMC 38.40.060 A: The proposed subdivision exemption to aggregate lots 3 and 4 must be submitted, approved, and completed prior to site plan approval. Understood, a subdivision exemption will be submitted concurrently with this site plan application. 2. DSSP II.C.3 – Basins serving multiple lots shall be located in common open space owned by a Homeowners or Property Owners Association. a. Common open space must be provided and delineated on the amended plat for the lot3/lot4 storm drainage pond. Common open space for the Lot 3/Lot 4 Storm Drainage Pond has been indicated on the amended plat Easements All of the following (2) documents must be acknowledged and recorded on the subdivision exemption prior to site plan approval: 1. BMC 38.410.060: The applicant must provide a storm drainage easement for the common Lot3/Lot4 storm water pond. Provide an easement draft with site plan submittal. Easements must be executed and delivered to the review engineer upon draft approval. The city standard storm drainage easement template is attached. Understood, the Lot3/Lot 4 storm drainage pond was built as a part of Phase 1 (Lots 1 &2) and an easement has been created for that storm pond. This easement has been dropped off at the COB for signature and is included in this site plan application. 2. BMC 38.410.060 (C) (1): The applicant must provide a twenty five (25) foot trail corridor easement for the multi-use trail section along the eastern parcel boarder. Provide an easement draft with site plan submittal. Easements must be executed and delivered to the review engineer upon draft approval. The city standard trail corridor easement template is attached. The 25’ trail corridor was not present in the Final Plat for Boulder Creek Subdivision. A exhibit was made of the proposed development in the PROST plan and a proposed trail corridor does not exist in this area. Please advise on how to proceed. Transportation & Access 1. BMC 38.220.080 (A) (2.g) - The applicant must submit a peak hour trip generation value and confirm the trip generation is within the subdivision transportation impact study. A traffic impact study was preformed December 2019 by Albelin Traffic Services for the Boulder Creek Apartments (Lots 1-4) with an AM Peak Hour trip of 40 and a PM Peak hour trip of 49. The traffic impact study is attached. Water Rights 1. BMC 38.410.130: Water rights and/or payment of cash-in-lieu of water right is required prior to development for the demand on the City’s potable water system. The applicant must contact Griffin Nielsen with the City Engineering Department to obtain a determination of cash-in-lieu of water rights (CILWR). Understood. Water and Wastewater 1. DSSP Section V (A) – A water design report must be prepared by a professional engineer for the proposed project. The water distribution system must be designed to meet the maximum day demand plus fire flow and the peak hour demand. a. The applicant must confirm flow allocations identified in the Phase I design report are not exceeded with the proposed Phase II development. Understood. A water design report with the flow allocation comparison between Phase I and II is included in this submittal. 2. DSSP Section V (B) - A design report prepared by a professional engineer licensed in the State of Montana demonstrating compliance with these requirements shall be submitted to and approved by the City of Bozeman. a. The applicant must confirm that the proposed Phase II development does not exceed flow allocations defined in the “Boulder Creek Apartments – Bozeman Sewer Improvements” submitted with Boulder Creek Apartments Phase I. Understood. A sewer design report has been included. Stormwater 1. DSSP Section II (B)/BMC 38.410.080 Water Quantity - A stormwater drainage design report must be prepared by a professional engineer for the proposed project. a. The applicant must confirm flow allocations identified in the Phase I design report are not exceeded with the proposed Phase II development. Understood. A stormwater drainage report has been included. 2. DSSP Section II (A) (4) Water Quality - The applicant must include a drainage plan with post- construction storm water management controls that are designed to infiltrate, evapotranspire, and/or capture for reuse the post-construction runoff generated from the first 0.5 inches of rainfall from a 24-hour storm preceded by 48 hours of no measurable precipitation. For projects that cannot meet 100% of the runoff reduction requirement, the remainder of the runoff from the first 0.5 inches of rainfall must be either: a. Treated onsite using post-construction storm water management control(s) expected to remove 80 percent total suspended solids (TSS); b. Managed offsite within the same sub-watershed using post-construction storm water management control(s) that are designed to infiltrate, evapotranspire, and/or capture for reuse; or c. Treated offsite within the same subwatershed using post-construction storm water management control(s) expected to remove 80 percent TSS. Understood 3. Montana Post Construction Strom Water BMP Design Guidance Manual - The applicant must demonstrate that seasonal high groundwater will not impact the function or maintenance of the proposed storm water treatment facilities. Industry guidance recommends a three-foot minimum separation from the bottom of the proposed facility to the underlying groundwater table. The applicant is advised to verify local groundwater elevations and incorporate these levels into the drainage design report. Understood Lighting 1. DSSP Section XII Lighting Design Criteria – The applicant must confirm that the existing lighting on Oak Street adjacent to the subject property meets current design standards. Lights have been added along Oak Street to meet current standards with the spacing shown on the Roadway Lighting Plan included with this submittal. SID Waiver 1. If not already filed for the subject site, the applicant must 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. Intersection improvements to Catamount Street and Jamboree Way including lighting, signalization/channelization, paving, curb/gutter, sidewalk, and storm drainage. b. Street improvements to West Oak Street including paving, curb/gutter, sidewalk, and storm drainage c. Street improvements to Annie Street including paving, curb/gutter, sidewalk, and storm drainage d. Street improvements to North Cottonwood Road including paving, curb/gutter, sidewalk, and storm drainage e. Street improvements to North Laurel Parkway including paving, curb/gutter, sidewalk, and storm drainage f. Intersection improvements to West Oak Street and North Laurel Parkway including lighting, signalization/channelization, paving, curb/gutter, sidewalk, and storm drainage. g. Intersection improvements to West Oak Street and North Cottonwood Road including lighting, signalization/channelization, paving, curb/gutter, sidewalk, and storm drainage. h. Intersection improvements to Durston Road and North Cottonwood Road including lighting, signalization/channelization, paving, curb/gutter, sidewalk, and storm drainage. i. Intersection improvements to Annie Street and North Laurel Parkway including lighting, signalization/channelization, paving, curb/gutter, sidewalk, and storm drainage. See attached SID waiver to be signed and notarized by the applicant. Provide a copy of the recorded SID waiver prior to Site Plan approval. A city standard SID waiver template is attached. A draft SID waiver has been included with this resubmittal. If acceptable it will be signed and recorded. ENGINEERING ADVISORY COMMENTS: 1. BMC 38.270.030 (C) (1.b) – The applicant must prove that the sewer volumes from the subject development will not exceed the allocated capacity as defined in the Laurel Glen Lift Station Capacity Analysis. The applicant is advised that if the allocated capacity exceeds the dedicated amount for the subject property, the development will not be eligible for building permits until additional capacity is demonstrated or is created at the lift station. The applicant is advised that the adjacent development (Northwest Crossing) is diverting upstream sewer flows through their development, which will provide additional capacity at the Laurel Glen Lift Station. The project is currently being constructed. If the development exceeds the allocated capacity as described in the Laurel Glen Lift Station Capacity Analysis. The developer may request concurrent construction as outlined in 38.270.030 D. Understood If you should have any questions regarding these comments, revisions and corrections for the Boulders Creek Apartments Site Plan Application don’t hesitate to contact me, _____________________________ Matthew E. Ekstrom, PE Project Engineer