HomeMy WebLinkAbout043 Shared Stormwater Agreement Correspondence1Josh Wolfram
From:Erik RingsakSent:Wednesday, July 2, 2025 4:47 PMTo:Josh WolframSubject:Fw: [EXTERNAL]RE: Hidden Creek - Shared Stormwater AgreementAttachments:Shared Stormwater Agreement_COB 070225.doc; ATT00001.txt; ATT00002.htmFollow Up Flag:Follow upFlag Status:Flagged Erik Ringsak, P.E. | Civil Department Manager 895 Technology Blvd, Ste 203 | Bozeman, MT 59718 O: 406.586.0262 | D: 406.898.3446 | C: 701.471.1099 www.wwcengineering.com From: Emiliano Esparza <eesparza@BOZEMAN.NET> Sent: Wednesday, July 2, 2025 4:36:08 PM To: Erik Ringsak <eringsak@wwcengineering.com> Cc: 'Seth O'Connell' <seth@uhousingpartners.com>; Lance Lehigh <llehigh@BOZEMAN.NET>; Simon Lindley <slindley@BOZEMAN.NET>; Seth O'Connell <seth@uhousingpartners.com>; Cody Flammond <CFlammond@BOZEMAN.NET> Subject: RE: [EXTERNAL]RE: Hidden Creek - Shared Stormwater Agreement WARNING: This email originated from an external sender. Please use caution when clicking links or opening attachments. Hello Erik, Please find attached the City’s comments on the Shared Stormwater Easement and Agreement (Agreement) for Hidden Creek. As discussed last week, to support next steps on the Hidden Creek Project, the City is willing to work with you and yo ur team on finalizing and executing the subject
Agreement in lieu of having stormwater facilities ser ving multiple lots in a dedicated lot. However,
implementation of the Agreement is contingent on the following: • The applicant must provide a copy of the recorded Agre ement prior to Final Plat approval. A
statement must be added to the Condition of Approval sheet of the plat that clearly identifies the
Agreement and the responsible parties for maintaining s hared stormwater facilities. • The applicant needs to continue to work with the City on finalizing the Agreement, this includes
addressing the attached comments and edits provided by the City on July 2, 2025. Furthermore,
2prior to finalizing the Agreement, City Legal staff ne eds to review and approve the Agreement.
Please account for a minimum of 10 business days to ha ve City Legal staff review the Agreement. • The Agreement needs to include adequate details summari zing maintenance requirements and
associated costs for the shared stormwater facilities. The following level of detail is expected to
be incorporated in the Agreement: o Typical stormwater maintenance depends on the type of f eature. I believe in the case of
Hidden Creek, there will be underground infiltration chambers. I would refer to the
manufacturer for frequency and methods of maintaining th ose elements. Maybe it could
be as simple as “per manufacturers recommendations”. The minimum inspection frequency is once per year according to Bozeman Munici pal Code. o The subsurface infiltration systems are designed with isolator rows that capture the “first
flush” of pollutants from runoff events. The isolator rows are equipped with inspection ports and direct manhole access for maintenance. The is olator row should be inspected for sediment buildup once every 6-months during the first year of operation, and once a
year after that. Use general preventative measures to h elp reduce sediment build up and
clogging. Clean out sediment buildup as necessary foll owing the manufacturer recommended procedures. o Surface features such as inlets, curb cuts, and swales should be inspected annually. It is
also a good idea to inspect in the springtime and after major storms. Tasks include: Keep the inlets of the facilities free of leaves, ro cks, and other debris. See that litter and other debris are removed from inle ts, swales, and vegetated and
paved areas. o The storm water swales are to be mowed down to 6” dur ing the fall and the cuttings are to
be promptly removed and disposed of. Turfgrass areas with swales should be mowed
approximately every two weeks during summer. Unless v isibly tainted, dispose of lawn
clippings as the same manner as yard waste. Otherwise, bag and take to a sanitary landfill. o Remove sediment by hand with a flat bottom shovel during the summer months whenever sediment covers vegetation or impedes the flow path o f a swale, curb cut, or sidewalk
chase. o Inspect underground stormwater facilities annually. Add itionally, inspect surface features
after heavy rains of 0.5 inches or more. Keep records of the inspection. o When inlets, pipes, or other stormwater features accum ulate sediment to 20% of their
depth, jet, vacuum, and dispose of the sediment. I look forward to working with you on next steps. Le t me know if you have any questions. Emiliano Esparza, P.E. City Engineer | Transportation and Engineering City of Bozeman C: 406-595-1328