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HomeMy WebLinkAboutMiscellaneous PLANNER 6/10/2012 Private Stormwater Management and Treatment System Operations and Maintenance Plan Specific Site facilities Requirements List of Stormwater Treatment Facilities covered under this agreement: • Vegetated Detention Pond/Swale • Drop in Catch Basin Filters Facilities and Maintenance List: Swales (Vegetated, Grassy, and Street) Operations& Maintenance Plan Swales are vegetated or grassed open channels that trap pollutants by filtering and slowing flows, allowing particles to settle out. The swale should drain within 48 hours of a storm event. All facility components, vegetation, and source controls shall be inspected for proper operations and structural stability, at a minimum, quarterly for the first 2 years from the date of installation, 2 times per year thereafter, and within 48 hours after each major storm event. The facility owner must keep a log. recording all inspection dates, observations, and maintenance activities. The following items shall be inspected and maintained as stated: Swale Inlet(such as curb cuts or pipes) shall maintain a calm flow of water entering the swale. • Source of erosion shall be identified and controlled when native soil is exposed or erosion channels are forming. • Sediment accumulation shall be hand-removed with minimum damage to vegetation using proper erosion control measures. Sediment shall be removed if it is more than 3" thick or so thick as to damage or kill vegetation. • Inlet shall be cleared when conveyance capacity is plugged. Sources of sediment and debris shall be identified and corrected. • Rock splash pads, spreaders and dissipaters shall be replenished to prevent erosion. Side Slopes shall be maintained to prevent erosion that introduces sediment into the swale. • Slopes shall be stabilized and planted using appropriate erosion control measures when native soil is exposed or erosion channels are forming. Swale Media shall allow stormwater to percolate uniformly through the landscape swale. If the swale does not drain within 48 hours, it shall be tilled and replanted according to design specifications. • Swale area shall be protected during construction from compaction. • Annual or semi-annual tilling shall be implemented if compaction or clogging continues. • Debris in quantities that inhibit operation shall be removed routinely (e.g., no less than quarterly), or upon discovery. Swale Outlet shall maintain sheet flow of water exiting swale unless a collection drain is used Source Source of Date Received: ( ( Planner: LM • • erosion damage shall be identified and controlled when native soil is exposed or erosion channels are forming. • Outlets such as drains and overland flow paths shall be cleared when 50% of the conveyance capacity is plugged. • Outlet structures shall be cleaned of sediment and debris at least 1 time per year or when the level is at 50% of the conveyance capacity. • Sources of sediment and debris shall be identified and corrected. Vegetation shall be healthy and dense enough to provide filtering while protecting underlying soils from erosion. Mulch shall be replenished as needed to ensure survival of vegetation. • Vegetation, large shrubs or trees that interfere with landscape swale operation shall be pruned. • Fallen leaves and debris from deciduous plant foliage shall be removed if build up is damaging vegetation. • Grassy swales shall be mowed to keep grass 4" to 9" in height. Clippings shall be removed when possible, to remove pollutants absorbed in grasses, or when build up is damaging vegetation. • Nuisance and prohibited vegetation (such as blackberries and English Ivy) shall be removed when discovered. Invasive vegetation contributing up to 25% of vegetation of all species shall be removed and replaced. • Dead vegetation and woody material shall be removed to maintain less than 10% of area coverage or when swale function is impaired. Vegetation shall be replaced within 3 months, or immediately if required to maintain cover density and control erosion where soils are exposed. Debris and Litter shall be removed to ensure stormwater conveyance and to prevent clogging of inlet and outlet drains and interference with plant growth. Spill Prevention measures shall be exercised when handling substances that contaminate stormwater. Releases of pollutants shall be corrected as soon as identified. Training and/or written guidance information for operating and maintaining swales shall be provided to all property owners and tenants. A copy of the O&M Plan shall be provided to all property owners and tenants. Access to the swale shall be safe and efficient. Egress and ingress routes shall be maintained to design standards. Roadways shall be maintained to accommodate size and weight of vehicles, if applicable. Swales (Vegetated, Grassy, and Street) Operations & Maintenance Plan • Obstacles preventing maintenance personnel and/or equipment access to the swale shall be removed. • Gravel or ground cover shall be added if erosion occurs, e.g., due to vehicular or pedestrian traffic. Insects &Rodents shall not be harbored in the swale. Pest control measures shall be taken when insects/rodents are found to be present. • If a complaint is received or an inspection reveals that a stormwater facility is significantly infested with mosquitoes or other vectors,the property owner/owners or their designee may be required to eliminate the infestation at the City inspector's discretion. Control of the infestation shall be attempted by using first non-chemical methods and secondly, only those chemical methods specifically approved by the City's inspector. Acceptable methods include but are not limited to the following: i. Installation of predacious bird or bat nesting boxes. ii. Alterations of pond water levels approximately every four days in order to disr pt mos /uito Date Received: disr mos Planner: LM • • larval development cycles. iii. Stocking ponds and other permanent water facilities with fish or other predatory species. iv. If non-chemical methods have proved unsuccessful, contact the City inspector prior to use of chemical methods such as the mosquito larvicides Bacillus thurengensis var. israeliensis or other approved larvacides. These materials may only be used with City inspector approval if evidence can be provided that these materials will not migrate off-site or enter the public stormwater system. Chemical larvicides shall be applied by a licensed individual or contractor. • Holes in the ground located in and around the swale shall be filled. If used at this site, the following will be applicable: Check Dams, flow spreaders and dissipaters shall control and distribute flow. • Causes for altered water flow or short circuits shall be identified,and obstructions cleared upon discovery. • Causes for channelization shall be identified and repaired. • Systems shall remain free of sediment build up and debris. Drop in Catch Basin Filters -Maintenance requirements from Manufacturer Date Received: /a l ( 2- Planner: LM STORMWATER MANAGEMENT FACILITY INSPECTION & MAINTENANCE LOG (SAMPLE) Property Address: Inspection Date: Inspection Time: Inspected By: Approximate Date/Time of Last Rainfall: Type of Stormwater Management Facility: Location of Facility on Site (In relation to buildings or other permanent structures): Water levels and observations (Oil sheen, smell, turbidity, etc.): Sediment accumulation & record of sediment removal: Condition of vegetation (Height, survival rates, invasive species present, etc.) & record of replacement and management(mowing, weeding, etc.): Condition of physical properties such as inlets, outlets, piping, fences, irrigation facilities, and side slopes. Record damaged items and replacement activities: Presence of insects or vectors. Record control activities: Identify safety hazards present. Record resolution activities: Date Received: Planner: LM Private Stormwater Management and Treatment System Operations and Maintenance Plan Required per Development Agreement In order to meet requirements of the City of Springfield MS4 Stormwater Discharge Permit the City has implemented several policies requiring private property owners to install and maintain facilities that manage and treat stormwater runoff before discharge to the public stormwater system. Nate Anderson (Property Owner/Developer) acknowledges and agrees to maintain stormwater treatment facilities listed in this document. The maintenance of the stormwater facilities listed in this document is required as part of the development agreement required by the City of Springfield. This facility will be operated and maintained in accordance with the requirements stated in this document and in the latest edition of the City of Springfield Engineering Design Standards and Procedures. As part of the required maintenance of the facility the city reserves the right to inspect any stormwater facilities to ensure the facilities are operating at a satisfactory level. Failure to inspect and maintain the facilities can result in an unacceptable impact to the public stormwater system and receiving waters. The requirement to operate and maintain the stormwater treatment facilities in accordance with the approved site development agreement is binding on all current and future owners of the property. This plan may be modified under written consent of both the property owners and the City of Springfield. For any questions regarding this plan, maintenance agreement and development agreement refer to the Public Works/Development Services front desk at 225 Fifth St, Springfield Oregon or call (541)-736-3753. Description of Property 4777 Main Street Subject to agreement Springfield, Oregon 97477 (Legal Address/Taxlot): Development Agreement: TYP2I2-00004 Anderson Dental Clinic Responsible Party: )3dT{� kI:lis 1l2 im ,o�T 11Ak , e ye— 5 `15 5 Date Received: tg (1—° Planner: LM • • By signing below, the signer accepts and agrees to the terms and conditions contained in the operations and maintenance plan and in any documents attached. Owner(s): Nate Anderson Signature " Print Name Td,uJ � STATE OF OREGON, County of Lane, This instrument as acknowledged before me this 2 © day of c"- - , 2012. By Nate Anderson, owner of the above described premises. •;. OFF • Mary Public or Oregon _';;':< LINDA l WIq �E GREON "CO ION NO an lad 1 / wry cOIBAISSoiEORESDSG N tos4 My Commission xpire Date Received: Planner: LM