03-27-2023 City Council Packet - Laserfiche WebLink

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2 THEREFORE: 1. The Permittee, at its cost, will inspect and maintain the stormwater management facilities delineated and labeled on Exhibit A as follows: west pond (Permit 96-039), east NURP ponds (Permit 01-096), and Infiltration Basin 1 (22- 118). The Permittee will: a. Obtain certified as-built contours for all ponds and inspect the ponds, and associated outlet structures, culverts and outfall structures one year and two years after the completion of as-builts, including measuring sediment accumulation by a method accurate to within one vertical foot. Thereafter, the Permittee will perform inspections in the fifth year after pond completion and every five years thereafter. If inspections show that sediment may accumulate to 50 percent of wet storage volume, or 25 percent of dry detention volume, within less than five years, the Permittee will inspect more frequently. Pond function will be considered inadequate if sediment accumulation has decreased the wet storage volume by 50 percent or dry detention volume by 25 percent, and the Permittee will restore the basin to its original design elevations and dimensions and restore vegetation in disturbed areas within one year of the inspection date. b. Inspect stormwater infiltration and filtration basins, including rain gardens, annually, to preserve live storage capacity at or above the design volume. Remove vegetation, maintain healthy plant growth and remove excess sediment and debris to ensure that the facilities continue to perform per design. c. Inspect grit chambers, sump catch basins and sump manholes annually. Accumulated sediment and debris will be removed so that the each facility continues to operate as designed and erosion or structural problems are corrected. d. Inspect conveyances and other structures annually. Ensure preservation of designed hydraulic capacity.