HomeMy WebLinkAboutAppendix 3-SOBO Lofts-SD Sytem Maintenance Plan
Project Name: SOBO Lofts Mixed Use Building
718 West Babcock Street, Bozeman, Montana
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Stormwater System Maintenance Plan
The stormwater system at the SOBO Lofts Mixed Use Building includes roof gutters and downspouts,
two storm drain inlets, and a buried perforated retention structure. The roof downspouts for the
commercial portion of the building are piped to the retention structure along with surface runoff from
the north parking lot. To prolong the life of the retention structure and allow the system to function
properly, we recommend the following maintenance procedures:
Roof gutters should be cleared of leaves and other debris once a year at a minimum. This will
minimize the potential for leaves to enter the system which could lead to premature clogging
of the retention structure or blockage of the drain pipe.
The downspout connections to the subsurface storm drain pipes should be visually inspected
once per year. Repairs should be made if these connections are not tight.
Sanding of the north parking lot should be done sparingly or avoided completely. Sand or
other sediment on the parking lot will likely be washed into the retention structure which can
lead to reduced infiltration capacity over time.
The inlet grate covers should be visually inspected on a weekly basis for snow, ice, or debris.
All snow, ice, and debris (leaves, mud, etc.) should be removed to allow water to enter the
inlets. The ability for surface water to enter the system is critical to the proper functioning of
the system.
Downspout overflow drains should be inspected on a weekly basis for ice and debris. Any ice
and debris should be removed to allow for a clear overflow path. If storm water is observed
flowing out of the overflow, the system should be inspected as water coming out of the
overflow is an indication the system is not functioning properly.
The inlet covers should be removed every three months to inspect the retention structure for
sediment or debris that could limit the ability for storm water to infiltrate into the subsurface.
If visible sediment or debris buildup is observed, the structure should be cleaned by use of
jetting and vacuuming. If standing water is observed in the detention/infiltration structure for
more than 48 hours after a storm event, the structure should be cleaned by use of jetting and
vacuuming. If upon cleaning the detention/infiltration structure, standing water is still
observed in the detention/infiltration structure for more than 48 hours after a storm event, the
soil surrounding the tank may be contaminated and should be examined by a professional.
The retention structure should be jetted and vacuumed, at a minimum, every three years.