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EXHIBIT C
Exhibit C – Stormwater Maintenance Plan
Detention Facility
A. Inspect the facility inspection ports, isolator row, and outlet structures every six (6) months, and additionally after any major storm event
producing 0.5 inches or greater of precipitation.
B. Remove sediment whenever accumulation exceeds twenty percent (20%) of the detention facility or isolator row depth.
C. Clean the detention facility, isolator row, and associated manholes using vacuuming, jetting, or other approved methods in accordance with
manufacturer instructions.
D. Maintain clear and unobstructed access to all inspection ports and manholes at all times.
E. Expected Design Life: 100 years for structural components, assuming proper installation, soil conditions, and regular maintenance.
F. Replacement Schedule: Structural components should be evaluated every 5 to 10 years. Major rehabilitation or replacement should be planned
based on observed corrosion, deformation, or reduced hydraulic capacity.
G. Planned Replacement Cost:
· 25,000 cubic feet × $12.50 per cubic foot = $312,500.
H. Recurring Operation & Maintenance:
· 2 inspections/year × $1,200 per inspection = $2,400/year
· Sediment removal & cleaning (biannual) = $3,000/year
· Total annual recurring cost: $5,400/year
Surface Inlets, Pipes, and Water Quality Facility
A. Inspect structures annually and additionally after major storm events producing 0.5 inches or greater of precipitation.
B. Remove debris, litter, leaves, and sediment that block inlets or flow paths.
C. Remove sediment by hand or vacuum when buildup impedes flow.
D. Expected Design Life: 50 years for inlet structures, pipes, and water quality facility, assuming regular maintenance.
E. Replacement Schedule: Replace or repair inlets when sediment accumulation, erosion, or structural damage reduces performance. Typically,
this occurs every 50 years depending on site conditions.
F. Planned Replacement Cost:
· Inlets: 10 shared units × $2,500 each = $25,000
· Pipes: 600 LF shared pipe × $75 per LF = $45,000
· Water Quality Facility: 1 shared unit × $75,000 each = $75,000
G. Recurring Operation & Maintenance:
· Inlets: 10 units × $200 per unit annually = $2,000/year
· Pipes: 600 LF × $1 per LF annually (flushing/inspection) = $600/year
· Water Quality Facility: 1 unit × $1,500/year for maintenance and cleaning
· Total annual recurring cost: $4,100/year
General Recordkeeping
A. Maintain inspection and maintenance records for the useful life of the Shared Stormwater Facilities.
B. Records shall include inspection dates, observations, maintenance performed, and the responsible party.
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C. Records shall be made available to the City of Bozeman upon request.
Responsibility and Enforcement
A. Each Owner shall ensure that maintenance is performed and that its share of costs is reimbursed in accordance with the CCRs.
B. Owners shall budget for both recurring operation and maintenance costs, and long-term replacement costs, in accordance with the expected
design life of system components.
Summary of Planned Replacement Costs
· Detention Facility: $312,500
· Surface Inlets, Pipes, and Water Quality Facility: $145,000
· Total Planned Replacement Cost: $457,500
Component Quantity Unit Cost Planned Replacement Cost Annual Recurring Cost Expected Life
Detention Facility 25,000 cf $12.50 / cf $312,500 $5,400 100 years
Surface Inlets 10 units $2,500 each $25,000 $2,000 50 years
Pipes 600 LF $75 / LF $45,000 $600 50 years
Water Quality Facility 1 unit $75,000 each $75,000 $1,500 50 years
Total $457,500 $9,500/year