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HomeMy WebLinkAboutStorm O&M manual-061121Gallatin Park Mixed Use 325 Gallatin Park Drive Storm Water Facilities Operation & Maintenance Manual Overview The Gallatin Park Subdivision HOA is responsible for maintaining the regional storm pond. The site HOA is responsible for maintenance of all of the onsite Storm Water Facilities, sidewalk chases, curb cuts, storm structures, storm swales and the storm water bioretention area per the schedule below. Maintenance The storm sidewalk chases, curb cuts and curb lines are to have the sediment removed by hand on a yearly basis or an updated maintenance schedule as determined by monitoring the sediment build-up of the inlets quarterly. Any removed sediment shall be removed from the site and disposed of properly as to not discharge into state waters. The Hydrodynamic Separator is to be visually inspected every 6 months to check for build-up of sediment in the bottom of the unit. If the sediment depth exceeds 75% of the sump depth or 18 inches deep, the sediment is to be removed using a vac-truck to suck out the sediment and dispose of it at a disposal site. The sediment depth can also be measured from the top of the unit. If the sediment is measured to be 5.7’ or less below the top of the separator unit, then the sediment needs to be removed. Floatables (trash) are to be netted out and disposed of prior to removing sediment with the vac-truck. Any oils or hydrocarbons are to be removed using absorbent pads prior to vac-trucking out the sediment. Reference the Contech CDS Inspection and Maintenance Guide for additional details. The storm water bioretention pond and grass swales shall be monitored every five years for sediment build-up. When the sediment build-up starts to decrease the capacity of the pond, the sediment shall be removed mechanically and hauled from the site. It the extraction of the sediment removes the vegetation from the bottom of the pond, it should be reseeded or re-sodded and appropriate storm water BMPs are to be installed until the vegetation is stabilized. If the gravel storage within the bioretention pond is compromised, it shall be removed and replaced with clean screened gravels. The owners of the first constructed building will be responsible for maintenance of all of the above items until an HOA is in place or until a second building is constructed. If two buildings are occupied, a HOA must be created which will take over all maintenance. Budget It is estimated that the yearly budget estimates to complete the above items is $1,000. This amount includes some contingency to build up a fund to allow bigger scale maintenance such as gravel replacement within the bioretention pond.