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18025 Draft O&M PlanRETURN TO: COMMUNITY AND ECONOMIC DEVELOPMENT Phone: 360-458-8496 CITY OF YELM 105 YELM AVE. W. YELM, WA 98597 AGREEMENT TO MAINTAIN STORMWATER FACILITIES AND TO IMPLEMENT A POLLUTION SOURCE CONTROL PLAN TYPE OF DOCUMENT: Agreement to Maintain Stormwater Facilities GRANTOR(S): NPR Holdings, LLC GRANTEE: City of Yelm, a Municipal Corporation LEGAL DESCRIPTION: Exhibit A of this document ABBREVIATED LEGAL DESCRIPTION: ASSESSOR TAX PARCEL I.D. NUMBERS: 644300900200 NAME OF PROJECT: NPR Recycling Facility ADDRESS OF PROJECT: 939 Northern Pacific Rd. Yelm, WA 98597 THIS AGREEMENT made and entered into this day of , 20___, by and between the CITY OF YELM, a municipal corporation (hereinafter referred to as “City”), and , (hereinafter referred to as “Owner”). WHEREAS, this agreement contains specific provisions with respect to maintenance of stormwater facilities and use of pollution source control best management practices (BMPs). The authority to require maintenance and pollution source control is provided in the Washington State Department of Ecology Stormwater Management Manual for Western Washington (2012 edition), Phase II NPDES Permit and the City Stormwater Management Plan (SWMP), and Chapter 18.27 of the Yelm Municipal Code. WHEREAS, Owner owns the following-described real property situated in Lewis County, State of Washington, as set forth in Exhibit A, which is attached hereto and made a part hereof: and WHEREAS, Owner has constructed improvements including, but not limited to, buildings, pavement, and stormwater facilities on the above-described real property, now, therefore, For and in consideration of the mutual benefits to be derived therefrom, it is mutually agreed as follows: A. City and Owner enter into the agreement in order to further the goals of City to ensure the protection and enhancement of City water resources. The responsibilities of each party to the agreement are identified below: 1. Owner shall: a. Implement the pollution source control program included herein as Exhibit 1. b. Implement the stormwater facility maintenance program included herein as Exhibit 2. c. Maintain a record (in the form of a logbook) of steps taken to implement the programs referenced in “a” and “b” above. The logbook shall be available to inspection by the City staff at Owner’s business address 939 Northern Pacific Rd, Yelm WA. The logbook shall catalog the action taken, who took it, when it was done, how it was done, and any problems encountered or follow-up actions recommended. Maintenance items (“problems”) listed in Exhibit 1 shall be inspected on a monthly or more frequent basis, as necessary. Owner shall photocopy the individual checklists in Exhibit “1” and use them to complete its monthly inspections. These completed checklists would then in combination, comprise the monthly logbook. d. Submit an annual report to City regarding implementation of the programs referenced in “a” and “b” above. The report must be submitted on or before May 15 of each calendar year and shall contain, at a minimum, the following: 1) Name, address, and telephone number of the business, the person, or the firm responsible for plan implementation, and the person completing the report. 2) Time period covered by the report. 3) A chronological summary of activities conducted to implement the programs referenced in “a” and “b”. A photocopy of the applicable sections of the logbook, with any additional explanation needed, shall normally suffice. For any activities conducted by paid parties not affiliated with Owner, include a copy of the invoice for services. 4) An outline of planned activities for the next year. e. Implement the actions in the report by September 15 th of each year. 2. City shall: a. Provide technical assistance to Owner in support of its operation and maintenance activities conducted pursuant to its maintenance and source control programs. Said assistance shall be provided upon request and as City time and resources permit, at no charge to Owner. b. Review the annual report and conduct a minimum of one (1) site visit per year to discuss performance and problems with Owner. c. Review this agreement with Owner and modify if conditions warrant at least once every three (3) years. B. Remedies: 1. If City determines that maintenance or repair work is required to be done to the stormwater facility existing on Owner’s property, the Director of the Department of Public Works or his/her designee shall give the owner of the property within which the drainage facility is located, and the person or agent in control of said property, notice of the specific maintenance and/or repair required. The Director shall set a reasonable time in which such work is to be completed by the persons who were given notice. If the above required maintenance and/or repair is not completed within the time set by the Director, written notice will be sent to the persons who were given notice stating City’s intention to perform such maintenance and bill Owner for all incurred expenses. 2. If at any time City determines that the existing system creates any eminent threat to public health or welfare, the Director may take immediate measures to remedy said threat. No notice to the persons listed in B.1 above shall be required under such circumstances. 3. The persons listed in B.1 above shall assume all responsibility for the cost of any maintenance and for repairs to the stormwater facility. Such responsibility shall include reimbursement to City within thirty (30) days of the receipt of the invoice for any such work performed. Overdue payments will require payment of interest at the current legal rate for liquidated judgments. If legal action ensues, any costs or fees incurred by City will be borne by the parties responsible for said reimbursements. 4. In the event Owner of the property fails to pay City within thirty (30) days from the date that the costs were incurred, City shall have the right to file a lien against the real property for all charges and expenses incurred. A lien specifying the expenses incurred and giving a legal description of the premises sought to be charged shall be filed with the County Auditor within ninety (90) days from the date of completion of the work. The same may at any time thereafter be collected in the manner provided for foreclosure of mechanic’s liens under the laws of the State of Washington. C. Intent: 1. This agreement is intended to protect the value and desirability of the real property described above and to benefit all the citizens of the City. It shall run with the land and be binding on all parties having or acquiring from Owner or their successors, any right, title or interest in the property or any part thereof, as well as their title, or interest in the property or any part thereof, as well as their heirs, successors and assigns. They shall inure to the benefit of each present or future successor in interest of said property or any part thereof, or interest therein, and to the benefit of all citizens of City. IN WITNESS WHEREOF the parties have executed the agreement the day and year above written. By: Signature STATE OF WASHINGTON ) ) SS COUNTY OF LEWIS ) I certify that I know or have satisfactory evidence that is the Person who appeared before me, and said person acknowledged that (he/she) signed this instrument, on oath stated that (he/she) is/are authorized to execute the instrument and acknowledged it as the of to be the free and voluntary act of such party for the uses and purposes mentioned in the instrument. Dated: Notary Signature Print Name NOTARY PUBLIC in and for the State of Washington, My Commission Expires: CITY OF YELM By: By: City Manager City Clerk STATE OF WASHINGTON ) )SS COUNTY OF LEWIS ) On this day of , 20___, before me, the undersigned, a Notary Public in and for the State of Washington duly commissioned and sworn, personally appeared , and , representing themselves as City Manager and City Clerk, respectively, of the City of Yelm, the municipal corporation that executed the foregoing instrument, and acknowledged the said instrument to be the free and voluntary act and deed of said municipal corporation, for the uses and purposes therein mentioned, and on oath stated that they were authorized to execute the said instrument. IN WITNESS WHEREOF, I have hereunto set my hand and official seal the day and year first above written. Notary Signature Print Name NOTARY PUBLIC in and for the State of Washington, residing at: My Commission Expires: Approved as to Form: Approved: By: By: City Attorney Stormwater Manager STORMWATER MAINTENANCE AGREEMENT EXHIBIT A Legal Description Thurston County Title Escrow No. TH8749 Lot 2, Block 9 in Mckenna Irrigated Tracts, as Recorded in Volume 9 of Plats, Page 43, Records of Thurston County, Washington. EXHIBIT 1 POLLUTION SOURCE CONTROL PROGRAM What Are Pollution Source Controls, and Why Are They Needed? Pollution source controls are actions taken by a person, business, or owner to reduce the amount of pollution reaching surface and ground waters. Controls also called “best management practice” (BMP’s), include: Altering the activity (e.g., substitute non-toxic products recycle used oil reroute floor drains to sanitary sewer from storm sewers) Enclosing or covering the activity (e.g., building a roof) Segregating the activity (e.g., diverting runoff away from an area that is contaminated) Routing runoff from the activity to a treatment alternative (e.g., to a wastewater treatment facility, sanitary sewer, or stormwater treatment area) Pollution source controls are needed because of the contamination found in runoff from commercial areas and the effect of this contamination on aquatic life and human health. Research on urban runoff in the Puget Sound area and elsewhere has found oil and grease, nutrients, organic substances, toxic metals, bacteria, viruses, and sediments at unacceptable levels. Effects of contaminated runoff include closure of shellfish harvesting areas and swimming areas, mortality of young fish and other aquatic organisms, tumors on fish, and impairment of fish reproduction. Sources and types of pollutants encountered with activities that may occur within the City can be found in Volume IV Appendix A of the Washington State Department of Ecology 2012 Stormwater Management Manual for Western Washington. MANUFACTURING Description Manufacturing businesses include food products: industrial machinery and equipment, trucks and trailers, and railroad; metal products; paper and pulp; printing; wood treatment; and other miscellaneous manufacturing businesses. Materials Used and Wastes Generated The primary concern is rainfall directly on exposed pollutant sources or stormwater runoff coming in contact with exposed pollutant sources. Potential pollutant locations include material storage, loading and handling areas; air emission locations; fuel islands; and pulp processing equipment. Potential pollutant sources include acids; ammonia; activated carbon; bleach; blood; bone meal; brewing residuals; caustic soda; chlorine; cook oven tar; detergents; eggs; feathers; feed; ferric chloride; food products; fats and oils; solvents; paints; chemicals; metals; lubricants; waste oil; slag; ash, particulate emissions; log yards; pulp; alcohol; vinyl lacquer; dyes; acetates; waste ink; ink sludge; creosote; coal tar; copper napthenate; and chromate copper arsenate. Potential pollutants include BOD; TSS; Oil and Grease; pH, ammonia nitrogen; pentachlorophenal; total Kjeldahl nitrogen; copper; manganese; fecal coliform; pesticides; heavy metals; COD; nitrates; nitrites; and phosphorous. See the Ecology Manual for further information specific to the proposed land use. TRANSPORTATION AND COMMUNICATION Description Transportation and communication businesses include warehouses and mini-warehouses. Materials Used and Wastes Generated The primary concern is rainfall directly on exposed pollutant sources or stormwater runoff coming in contact with exposed pollutant sources. Potential pollutant locations include loading and unloading areas; outside storage of materials and equipment; and fueling and maintenance areas. Potential pollutant sources include chemicals; metals; and fuels. Potential pollutants include TSS and Oil and Grease. See the Ecology Manual for further information specific to the proposed land use. RETAIL Description Retail businesses include gas stations; restaurants and fast food; general merchandise; vehicle and equipment dealers; nurseries and building materials; chemicals and petroleum; foods and beverages; and other miscellaneous businesses. Materials Used and Wastes Generated The primary concern is rainfall directly on exposed pollutant sources or stormwater runoff coming in contact with exposed pollutant sources. Potential pollutant locations include fuel transfer areas, material loading, storage and handling areas; high-use parking lots; garbage dumpsters; cooking vent filters; fuel or chemical storage areas; and vehicle/equipment maintenance areas. Potential pollutant sources include hazardous materials; biological materials, chemicals, oils; grease, detergents, metals, pesticides; herbicides; solvents; paints; benzene; phenol; chloroform; lead; and zinc. Potential pollutants include TSS, Oil and Grease, metals, phosphorous. See the Ecology Manual for further information specific to the proposed land use. PROFESSIONAL SERVICES Description Professional service businesses include animal care services; commercial car and truck washes; equipment repair, laundries and other cleaning services; golf and county clubs, professional services, vehicles maintenance and repair, multifamily residences; commercials businesses; and other miscellaneous services. Materials Used and Wastes Generated The primary concern is rainfall directly on exposed pollutant sources or stormwater runoff coming in contact with exposed pollutant sources. Potential pollutant locations include outside animal boarding areas; fuel transfer areas; vehicle wash areas; high-use parking lots; and garbage dumpsters. Potential pollutant sources include animal wastes; Oils and Grease; hazardous materials; detergents; solvents; fertilizers; herbicides; pesticides; paints; inks; photographic chemicals; metals; dangerous or hazardous wastes; waste oil; antifreeze, radiator flush; acids; and battery wastes. Potential pollutants include TSS, BOD, COD, Oil and Grease, fecal coliform, nutrients; pH; and metals. See the Ecology Manual for further information specific to the proposed land use. REQUIRED ACTIONS The following actions at a minimum shall be taken to ensure that pollution generated on site shall be minimized: 1.Implement pollution control / reduction BMP’s in accordance with the approved Stormwater Site Plan. The Stormwater Site Plan shall be prepared in accordance with the 2012 Washington State Department of Ecology Stormwater Management Manual for Western Washington and the City’s Design and Development Guidelines. 2.Parking lots shall be swept when necessary to remove debris and, at a minimum, twice a year. Use of newer model high-velocity vacuum sweepers is recommended as they are more effective in removing the more harmful smaller particles from paved surfaces. 3.Sediment removed from ponds/catch basins shall be disposed of in a proper manner contact the City for instruction prior to completing this task. 4.No activities shall be conducted onsite that are likely to result in short-term high- concentration discharge of pollution to the stormwater system. Such activities may include, but are not limited to, vehicle washing, vehicle maintenance, and cleaning of equipment used in the periodic maintenance of buildings and paved surfaces. 5.Employees shall receive basic instruction regarding the control of pollution from commercial operations. Contact the Yelm Public Works at (360) 330-7512. 6.Professional service offices with high volume customer contacts have potential to influence individuals’ water quality practices. Owners are encouraged to have informational brochures provided by the City (see Item 5 above) available in waiting rooms. 7.Warning signs (e.g., “Dump No Waste-Drains to Stream”) shall be painted or embossed on or adjacent to all storm drain inlets. They shall be repainted as needed. STORMWATER MAINTENANCE AGREEMENT EXHIBIT 2 MAINTENANCE PROGRAM Cover Sheet Inspection Period: Number of Sheets Attached: Date Inspected: Name of Inspector: Inspector’s Signature: Defect Conditions When Maintenance Results Expected When Date Inspected is needed Maintenance is Performed Inspected By General Trash & Debris Any trash and debris which Trash and debris cleared exceed 5 cubic feet per 1,000 from site. square feet (this is about equal to the amount of trash it would take to fill up one standard size garbage can). In general, there should be no visual evidence of dumping. If less than threshold all trash and debris will be removed as part of next scheduled maintenance. Poisonous /Any poisonous or nuisance No danger of poisonous Noxious vegetation which may vegetation where main- Vegetation constitute a hazard to tenance personnel or the maintenance personnel public might normally be. or the public.(Coordinate with local health department. Any evidence of noxious weeds as defined by State or Complete eradication of local regulations.noxious weeds may not be possible. Compliance with (Apply requirements of State or local eradication adopted IPM policies for policies required. the use of herbicides. Contaminants Any evidence of oil, gasoline, and Pollution contaminants or other pollutants (Coordinate removal/clean-up with local water quality response agency). Rodent Holes Any evidence of rodent holes if Rodents destroyed and facility is acting as a dam or dam or berm repaired. berm, or any evidence of water (Coordinate with local piping through dam or berm health department; via rodent holes.coordinate with Ecology Dam Safety Office if pond exceeds 10 acre-feet.) No. 2 - Infiltration Maintenance Component Defect Conditions When Maintenance Results Expected When Date Inspected is needed Maintenance is Performed Inspected By Storage Area Sediment Water ponding in infiltration Sediment is removed and/or pond after rainfall ceases and facility is cleaned so that appropriate time allowed for infiltration system works infiltration.according to design. (A percolation test pit or test of facility indicates facility is only working at 90% of its designed capabilities. If two inches or more sediment is present, remove.) Filter Bags Filled with Sediment and debris fill bag Filter bag is replaced or (if applicable)Sediments more than 1/2 full.system is redesigned. and Debris Rock Filters Sediment By visual inspection, little or Gravel in rock filter is and Debris no water flows through filter replaced. during heavy rain storms. Side Slopes Erosion Eroded damage over 2 inches Slopes should be stabilized of Pond deep where cause of damage using appropriate erosion is still present or where there control measure(s); e.g., potential for continued erosion.rock reinforcement, planting of grass, compaction. Any erosion observed on a compacted berm embankment.If erosion is occurring on compacted berms a licensed civil engineer should be consulted to resolve source of erosion. Emergency Tree Growth Tree growth on emergency Trees should be removed. Overflow spillways creates blockage If root system is small Spillway and problems and may cause (base less than 4 inches) Berms over 4 failure of the berm due to the root system may be feet in height.uncontrolled overtopping.left in place. Otherwise the roots should be Tree growth on berms over 4 removed and the berm feet in height may lead to restored. A licensed civil piping through the berm which engineer should be could lead to failure of the consulted for proper berm/ berm.spillway restoration. Piping Discernable water flow through Piping eliminated. pond berm. Ongoing erosion Erosion potential resolved. with potential for erosion to continue. (Recommend a Geotechnical engineer be called in to inspect and evaluate condition and recommend repair of condition. No. 2 - Infiltration Maintenance Component Defect Conditions When Maintenance Results Expected When Date Inspected is needed Maintenance is Performed Inspected By Emergency Rock Missing Only one layer of rock exists Rocks and pad depth are Overflow above native soil in area five restored to design Spillway square feet or larger, or any standards. exposure of native soil at the top of out flow path of spilway. (Rip-Rap on inside slopes need not be replaced.) Erosion Eroded damage over 2 inches Slopes should be stabilized deep where cause of damage using appropriate erosion is still present or where there control measure(s); e.g., potential for continued erosion.rock reinforcement, planting of grass, compaction. Any erosion observed on a compacted berm embankment.If erosion is occurring on compacted berms a licensed civil engineer should be consulted to resolve source of erosion. Pre-setting Facility or 6" or designed sediment trap Sediment is removed. Ponds and sump filled depth of sediment Vaults with Sediment and/or debris No. 2 - Infiltration Maintenance Component Maintenance Defect Conditions When Maintenance Results Expected When Date Inspected Component is Needed Maintenance is Inspected By: performed General Trash &Trash or debris which is located No trash or debris Debris immediately in front of the catch located immediately in basin opening or is blocking front of catch basin or inletting capacity of the basin by on grate opening. more than 10%. Trash or debris (in the basin)No trash or debris in the that exceeds 60% of the sump the catch basin. depth as measured from the bottom of basin to invert of the lowest pipe into or out of the basin, but in no case less than a minimum of 6 inches clearance from the debris clearance from the sediment surface to the invert of the lowest pipe. Trash or debris in any inlet or Inlet and outlet pipes outlet pipe blocking more than free of trash or debris. 1/3 of its height. Dead animals or vegetation that No dead animals or could generate odors that could vegetation present cause complaints or dangerous within the catch basin. gases (e.g., methane). Sediment Sediment (in the basin) that No sediment in the exceeds 60% of the sump depth catch basin. as measured from the bottom of basin to invert of the lowest pipe into or out of the basin, but in no case less than a minimum of 6 inches clearance from the sediment surface to the invert of the lowest pipe. Structure Top slab has holes larger than Top slab is free of holes Damage to 2 square inches or cracks wider and cracks. Frame and/or than 1/4-inch. Top Slab (Intent is to make sure no material is running into basin.) Frame not sitting flush on top Frame is sitting flush on slab, i.e., separation of more the riser rings or top than 3/4-inch of the frame from slab and firmly attached. the top slab. Frame not securely attached. Fractures or Maintenance person judges that Basin replaced or repaired Cracks in structure is unsound.to design standards. Basin Walls/ Bottom No. 5 - Catch Basins Maintenance Defect Conditions When Maintenance is NeededResults Expected When Date Inspected Component Maintenance is Inspected By: performed General Fractures or Grout fillet has separated or Pipe is regrouted and Cracks in cracked wider than 1/2-inch and secure at basin wall Basin Walls/longer than 1-foot at the joint of Bottom soil particles entering catch basin through cracks. Settlement /If failure of basin has created a Basin replaced or repaired Misalignment safety, function, or design to design standards. problem. Vegetation Vegetation growing across and No vegetation blocking blocking more than 10% of the opening to basin. basin problem. Vegetation growing in inlet/outlet No vegetation or root pipe joints that is more than six growth present. inches tall and less than six inches apart. Contamination Any evidence of oil, gasoline,No pollution present and Pollution contaminants or other pollutants (Coordinate removal/clean-up with local water quality response agency). Catch Basin Cover Not in Cover is missing or only partially Catch basin cover is Cover Place in place. Any open catch basin closed. requires maintenance. Locking Mechanism cannot be opened Mechanism opens with Mechanism by one maintenance person with proper tools. Not Working proper tools. Bolts into frame have less than 1/2-inch of thread. Cover Difficult One maintenance person can Cover can be removed by to Remove not remove lid after applying one maintenance person. normal lifting pressure. (Intent is keep cover from sealing off acces to maintenance.) Ladder Ladder Rungs Ladder is unsafe due to missing Ladder meets design Unsafe rungs, not securely attached to standards and allows basin wall, misalignment, rust,maintenance person cracks, or sharp edges.safe access. Metal Grates Grate opening Grate with opening wider than Grate opening meets (If Applicable)Unsafe 7/8-inch.design standards. Trash and Trash and debris that is blocking Grate free of trash and Debris more than 20% of grate surface debris. inletting capacity. Damaged or Grate missing or broken Grate is in place and Missing.member(s) of the grate.meets design standards. No. 5 - Catch Basins Maintenance Defect Conditions When Maintenance Results Expected When Date Inspected Component is Needed Maintenance is Inspected By: performed General Trash and Trash or debris that is plugging Barrier cleared to design Debris more than 20% of the opening flow capacity. in the barrier. Metal Damaged/Bars are bent out of shape more Bars in place with no Missing Bars than 3 inches.bends more than 3/4 inch. Bars are missing or entire Bars in place accoring barrier missing.to design. Bars are loose and rust is Barrier replaced or repaired causing 50% deterioration to to design standards. any part of barrier. Inlet/Outlet Debris barrier missing or not Barrier firmly attached to Pipe attached to pipe.pipe. No. 6 - Debris Barriers (e.g., Trash Racks) No. 7 - Energy Dissipaters Maintenance Defect Conditions When Maintenance Results Expected When Date Inspected Components is Needed Maintenance is Inspected By: performed External: Rock Pad Missing or Only one layer of rock exists Rock pad replaced to Moved Rock above native soil in area five design standards. square feet or larger, or any exposure of native soil. Erosion Soil erosion in or adjacent to Rock pad replaced to rock pad.design standards. Dispersion Pipe Accumulated sediment that Pipe cleaned/flushed so Trench Plugged with exceeds 20% of the design that it matches design. Sediment depth. Not Visual evidence of water dis-Trench redesigned or Discharging charging at concentrated points rebuilt to standards. Water along trench (normal condition Properly is a "sheet flow" of water along trench). Intent is to prevent erosion damage. Perforations Over 1/2 of perforations in pipe Perforated pipe cleaned Plugged are plugged with debris and or replaced. sediment. Water Flows Maintenance person observes Facility rebuilt or redesigned Out Top of or receives credible report of to standards. "Distributor"water flowing out during any Catch Basin storm less than the design storm or its causing or appears likely to cause damage. Receiving Water in receiving area is No danger of landslides. Area Over-causing or has potential of Saturated causing landslide problems. Internal: Manhole/Worn or Structure dissipating flow Structure replaced to Chamber Damaged deteriorates to 1/2 of original design standards. Post,size of any concentrated worn Baffles, Side spot exceeding one square foot of Chamber which would make structure unsound. Other Top slab has holes larger than Top slab is free of holes Defects 2 square inches or cracks wider and cracks. than 1/4-inch. (Intent is to make sure no material is running into basin.) Frame not sitting flush on top Frame is sitting flush on slab, i.e., separation of more the riser rings or top than 3/4-inch of the frame from slab and firmly attached. the top slab. Frame not securely attached. No. 7 - Energy Dissipaters Maintenance Defect Conditions When Maintenance Results Expected When Date Inspected Components is Needed Maintenance is Inspected By: performed Manhole /Other Maintenance person judges that Basin replaced or repaired Chamber Defects structure is unsound.to design standards. Grout fillet has separated or Pipe is regrouted and cracked wider than 1/2-inch and secure at basin wall longer than 1-foot at the joint of soil particles entering catch basin through cracks. Maintenance Defect or Condition When Recommended Maintenance Date Inspected Component Problem Maintenance is Needed to Correct Problem Inspected By: General Sediment Sediment depth exceeds 2 Remove sediment deposits in Accumulation inches in 10% of the swale treatment area. treatment area. Water Depth Water not retained to a depth Build up or repair outlet berm of about 4 inches during the so that water is retained in the wet season.wet swale. Wetland Vegetation becomes sparse Determine cause of lack of Vegetation and does not provide adequate vigor of vegetation and correct. filtration, OR vegetation is Replant as needed. For exces- crowded out by very dense sive cattail growth, cut cattail clumps of cattail, which do not shoots back and compost off- allow water to flow through the site. Note: normally wetland clumps.vegetation does not need to be harvested unless die-back is causing oxygen depletion in downstream waters. Inlet/Outlet Inlet/outlet area clogged with Remove clogging or blockage sediment and/or debris.in the inlet and outlet areas. Trash and Any evidence of oil, gasoline,Remove trash and debris from Debris contaminants or other wet swale. Accumulation pollutants (Coordinate removal/clean-up with local water quality response agency). Erosion/Swale has eroded or scoured Check design flows to assure Scouring due to flow channelization, or swale is large enough to higher flows.handle flows. By-pass excess flows or enlarge swale. Replant eroded areas with fibrous-rooted plants such as Juncus Effusus (Soft Rush) in the wet areas or Snowberry (Symphoricarpos Albus) in dryer areas. No. 9 - Wet Biofiltration Swale/Raingarden/Bio-Retention