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HomeMy WebLinkAbout003_CommentResponseLetter September 26, 2022 Alicia Paz-Solis City of Bozeman Engineering Division 20 East Olive Street Bozeman, MT 59715 Reference: Application No. 21335, Westlake Park Improvements SP Dear Alicia: In response to your memorandum dated September 10, 2021, we have revised the application documents. Responses to comments are provided below. 1. DSSP V.D.5.c - Trees or other significant landscaping features shall not be placed within ten (10) feet of any utility main or service lines. a. As proposed, part of the retaining wall is shown to be running over an existing 28-inch Corrugated Metal Pipe (CMP) storm main on the west side of the property. b. The applicant needs to present alternative design layout to relocate the existing CMP so as to prevent issues related to future maintenance. The applicant needs to coordinate with Stormwater Division to address this issue. Response: Trees and other significant landscape features are now placed further than ten (10) feet of any utility main or service lines. Design layout has been coordinated with the Stormwater Division to address this issue and to relocate the existing CMP. 2. DSSP Section II.A.4 - Water Quality: The applicant must include a drainage plan with post-construction stormwater 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, Alicia Paz-Solis September 26, 2022 Page 2 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. Response: Additional capacity was added to the underground detention facility to accommodate runoff from the first 0.5-inches of rainfall from a 24-hour storm. See sheet C3.0. See also updated Stormwater Design Report. 3. DSSP V.A.6 and V.B.11 - If applicable, water and sewer service lines must be shown on the southwest corner for future building (restrooms, concessions, etc). Existing building service lines must also be shown on site plan. Response: Sewer and water utility connections are not within the scope of work of this project. Future needs for utilities for a concession/restroom facility will need to be coordinated with parks staff. Please do not hesitate to contact me if you have any questions or need any additional information for these submittal materials. Sincerely, Erik Sweet, RLA Project Manager EJSW Enc.