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HomeMy WebLinkAboutPARKING AT 620 S. LEMAY AVE. - MJA/FDP - FDP150009 - SUBMITTAL DOCUMENTS - ROUND 1 - STORMWATER-RELATED DOCUMENTSPage 1 of 2 STANDARD OPERATING PROCEDURES (SOPs) Parking at 620 S. Lemay Avenue, Fort Collins, CO A. PURPOSE In order for physical stormwater Best Management Practices (BMPs) to be effective, proper maintenance is critical. Maintenance includes both routinely scheduled activities, as well as non- routine repairs that may be required after large storms, or as a result of other unforeseen problems. Standard Operating Procedures (SOPs) should clearly identify BMP Maintenance responsibility. BMP maintenance is typically the responsibility of the entity owning the BMP. Identifying who is responsible for maintenance of BMPs and ensuring that an adequate budget is allocated for maintenance is critical to the long-term success of BMPs. Maintenance responsibility may be assigned either publicly or privately. For this project, the privately owned BMPs shown in Section B below are to be maintained by the property owner, homeowner’s association (HOA), or property manager. B. BMPS SUBJECT TO SOP REQUIREMENTS The following stormwater facilities contained within the Parking at 620 S. Lemay Avenue project are subject to SOP requirements: - Rain Garden Detention Basin (RG) - Storm Sewers and Tree Roots The location of said facilities can be found on the Site Plan, Landscape Plans, and Utility Plans for Parking at 620 S. Lemay Avenue. C. SITE-SPECIFIC STANDARD OPERATING PROCEDURES Inspection and maintenance procedures and frequencies, specific maintenance requirements and activities, as well as BMP-specific constraints and considerations shall follow the guidelines outlined in volume 3 of the Urban Drainage and Flood Control District (UDFCD) Urban Storm Drainage Criteria Manual, latest revision. The Storm Sewer maintenance procedures follow. The Storm Sewer Lines (Table 1) and Extended Detention Basin (Table 2) maintenance plans are as follows: Storm Sewer Lines Maintenance Plan The storm sewer lines are located in close proximity to many trees. The situation is unavoidable; therefore, special maintenance has been identified to ensure these storm drain systems perform as they were designed. In addition, Inlets and outlet rip-rap will need to be maintained. Page 2 of 2 Table 1 – Routine Storm Sewer Line Maintenance Required Action Maintenance Objective Frequency of Action Line Inspections Use a video camera to inspect the condition of the storm sewer pipes. Cleanout pipes as needed. If the integrity of the pipe is compromised, then repair the damaged section(s). Routine -Annual inspection of hydraulic and structural facilities. Also check for obvious problems during routine maintenance visits, especially for plugging of outlets. Inlet Inspections Inspect and clean inlet weirs and boxes of any debris. Routine – Annual inspection of inlets to ensure proper operation and prevent plugging. Riprap Outlet Protection Inspections Maintain riprap (rock) storm sewer outlet protection to ensure proper operation. Routine – Annual inspection of riprap to replace dislodged stones, remove debris, etc. Rain Garden Maintenance Plan Table 1 – Routine EDB Maintenance (Summary from Table EDB-1, Chapter 6 of UDFCD) Required Action Maintenance Objective Frequency of Action Lawn mowing and Lawn care Occasional mowing to limit unwanted vegetation. Maintain irrigated turf grass as 2 to 4 inches tall and non-irrigated native turf grasses at 4 to 6 inches. Routine - Depending on aesthetic requirements. Sediment, Debris, and Litter removal Removal of sediment, debris, and litter from the entire pond to minimize outlet clogging and improve aesthetics. Routine - Including just before annual storm seasons (April and May), end of storm season after leaves have fallen, and following significant rainfall events. Major Pond Sediment removal* Remove accumulated sediment from the bottom of the basin. Non-routine - Performed when sediment accumulation occupies 20 percent of the WQCV. This may vary considerably, but expect to do this every 10 to 20 years, as necessary per inspection if no construction activities take place in the tributary watershed. More often if they do. Inspections Inspect basins to insure that the basin continues to function as initially intended. Examine the outlet for clogging, erosion, slumping, excessive sedimentation levels, overgrowth, embankment and spillway integrity and damage to any structural element. Every two to five years.