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20150212 Stormwater Agreement 02022017RESIDENTIAL AGREEMENT TO MAINTAIN STORMWATER FACILITIES BY AND BETWEEN MOUNTAIN TERRACE BUILDERS, LLC ITS HEIRS, SUCCESSORS, OR ASSIGNS (HEREINAFTER "DEVELOPER ") AND City of Yelm, Washington HEREINAFTER "JURISDICTION ") The upkeep and maintenance of stormwater facilities and the implementation of pollution source control best management practices (BMPs) is essential to the protection of water resources. All property owners are expected to conduct business in a manner that promotes environmental protection. This Agreement contains specific provisions with respect to maintenance of stormwater facilities and use of pollution source control BMPs. LEGAL DESCRIPTION: A PORTION OF THE SOUTHWEST QUARTER OF THE NORTHWEST QUARTER OF SECTION 19, TOWNSHIP 17 NORTH, RANGE 2 EAST, W.M., DESCRIBED AS FOLLOWS: BEGINNING AT A POINT ON THE NORTH LINE OF SAID SUBDIVISION WHICH IS 256.65 FEET WEST OF THE NORTHEAST CORNER THEREOF; THENCE WEST 204.66 FEET TO A POINT 943.65 FEET EAST OF THE NORTHWEST CORNER OF SAID SUBDIVISION; THENCE SOUTH 37° 56' WEST 525 FEET, MORE OR LESS, TO THE NORTHEAST LINE OF COATES STREET IN THE TOWN OF YELM; THENCE SOUTH 52° 04' EAST ALONG THE SAID NORTHEAST LINE OF COATES STREET 160 FEET; THENCE NORTH 37° 56' EAST 652 FEET, MORE OR LESS, TO THE POINT OF BEGINNING; EXCEPT THAT PORTION CONVEYED TO THE CITY OF YELM BY DEED RECORDED DECEMBER 5, 2008 UNDER AUDITOR'S FILE NO. 4049148; IN THE COUNTY OF THURSTON, STATE OF WASHINGTON. Whereas, the DEVELOPER has constructed improvements, including but not limited to, buildings, pavement, and stormwater facilities on the property described above. In order to further the goals of the Jurisdiction to ensure the protection and enhancement of water resources, the Jurisdiction and the DEVELOPER hereby enter into this Agreement. The responsibilities of each party to this Agreement are identified below. DEVELOPER SHALL: (1) Implement the stormwater facility maintenance program included herein as Attachment "A." (2) Implement the pollution source control program included herein as Attachment "B." (3) Maintain a record (in the form of a log book) of steps taken to implement the programs referenced in (1) and (2) above. The log book shall be available for inspection by appointment at 14730 SR 507 SE, Yelm, WA 98597. The log book shall catalog the action taken, who took it, when it was done, how it was done, and any problems encountered or follow -on actions recommended. Maintenance items ( "problems ") listed in Attachment "A" shall be inspected as specified in the attached instructions or more often if necessary. The DEVELOPER is encouraged to photocopy the individual checklists in Attachment "A" and use them to complete its inspections. These completed checklists would then, in combination, comprise the log book. (4) Submit an annual report to the Jurisdiction regarding implementation of the programs referenced in (1) and (2) above. The report must be submitted on or before May 15 of each calendar year and shall contain, at a minimum, the following: (a) Name, address, and telephone number of the businesses, the persons, or the firms responsible for plan implementation, and the person completing the report. (b) Time period covered by the report. (c) A chronological summary of activities conducted to implement the programs referenced in (1) and (2) above. A photocopy of the applicable sections of the log book, with any additional explanation needed, shall normally suffice. For any activities conducted by paid parties, include a copy of the invoice for services. (d) An outline of planned activities for the next year. THE JURISDICTION SHALL: (1) Provide technical assistance to the DEVELOPER 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 Jurisdiction time and resources permit. (2) Review the annual report and conduct a minimum of one (1) site visit per year to discuss performance and problems with the DEVELOPER. (3) Review this agreement with the DEVELOPER and modify it as necessary at least once every three (3) years. REMEDIES: (1) If the Jurisdiction determines that maintenance or repair work is required to be done to the stormwater facilities located in the subdivision, the Jurisdiction shall give the DEVELOPER notice of the specific maintenance and /or repair required. The Jurisdiction 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 Jurisdiction, written notice will be sent to the DEVELOPER stating the Jurisdiction's intention to perform such maintenance and bill the DEVELOPER for all incurred expenses. (2) If at any time the Jurisdiction determines that the existing system creates any imminent threat to public health or welfare, the Jurisdiction may take immediate measures to remedy said threat. No notice to the persons listed in Remedies (1), above, shall be required under such circumstances. All other DEVELOPER'S responsibilities shall remain in effect. (3) The DEVELOPER grants unrestricted authority to the Jurisdiction for access to any and all stormwater system features for the purpose of performing maintenance or repair as may become necessary under Remedies (1) and /or (2). (4) The DEVELOPER shall assume responsibility for the cost of maintenance and repairs to the stormwater facility, except for those maintenance actions explicitly assumed by the Jurisdiction in the preceding section. Such responsibility shall include reimbursement to the Jurisdiction within 90 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 the Jurisdiction will be borne by the parties responsible for said reimbursements. This Agreement is intended to protect the value and desirability of the real property described above and to benefit all the citizens of the Jurisdiction. It shall run with the land and be binding on all parties having or acquiring any right, title, or interest, or any part thereof, of real property in the subdivision. 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 the Jurisdiction. MOUNTAIN TERRACE BUILDERS, LLC, a Washington Limited Liability Company go Michael Kempinski, Member Dated this day �,� day of 20 Public Works Director, City of Yelm STATE OF WASHINGTON } i erc }S. S. COUNTY OF } On this day and year above personally appeared before me, Michael �prvlj�,tnsk who executed the foregoing instrument and acknowledge the said instrument to be the free and voluntary act and deed of said party for the uses and purposes therein mentioned and on oath stated he is authorized to execute the said instrument. Given under meUx` eftq icial seal this day of 20 j. Kr. 1. 'l� jR�! i DEBBERA L. HIRTLER °� °T'�Ri'� ; Notary Pul#c in and for the State of '" - • - �'= Washington, residing inclazAE&A (Pa� OaBV_ 0 : My commission expires O �l /Q -/4' //,If OP WASN"����� STATE OF WASHINGTON } )S. S. COUNTY OF THURSTON ) On this day and year above personally appeared before me, , who executed the foregoing instrument and acknowledge 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 he is authorized to execute the said instrument. Given under my hand and official seal this day of , 20 Notary Public in and for the State of Washington, residing in My commission expires ATTACHMENT "A" TYLER TERRACE STORMWATER FACILITY MAINTENANCE GUIDE December 7, 2016 INTRODUCTION What is Stormwater Runoff? When urban and suburban development covers the land with buildings, houses, streets and parking lots, much of the native topsoil, duff, trees, shrubs and grass are replaced by asphalt and concrete. Rainfall that would have soaked directly into the ground instead stays on the surface as stormwater runoff making its way into storm drains (including man -made pipes, ditches, or swale networks), stormwater ponds, surface and groundwater, and eventually to Puget Sound. What is a Storm Drain System and how does it work? The storm drain system for most developments includes components that carry, store, cleanse, and release the stormwater. These components work together to reduce the impacts of development on the environment. These impacts can include flooding which results in property damage and blocked emergency routes, erosion which can cause damage to salmon spawning habitat, and pollution which harms fish and /or drinking water supplies. The storm drain system provides a safe method to carry stormwater to the treatment and storage area. Swales and ponds filter pollutants from the stormwater by physically settling out particles, chemically binding pollutants to pond sediments, and biologically converting pollutants to less - harmful compounds. The ponds also store the treated water, releasing it gradually to a nearby stream or to groundwater. The various components of storm drain systems are described in the glossary. What Does Stormwater Runoff have to do with Water Quality? Stormwater runoff needs to be treated because it carries litter, oil, gasoline, fertilizers, pesticides, pet wastes, sediments, and anything else that can float, dissolve or be swept along by the moving water. Left untreated, polluted stormwater can reach nearby waterways where it can harm and even kill aquatic life. It can also pollute groundwater to the extent that it must be treated before it can be used for drinking, which has actually happened in Thurston County. Nationally, stormwater is recognized as a major threat to water quality. Remember to keep everything out of stormwater systems except the rainwater they are designed to collect. Your Neighborhood Stormwater Facility Stormwater facilities can be attractive as well as functional. They can provide both active and passive - use recreation areas and open space for wildlife. Perhaps you've noticed a wet pond or dry pond in your neighborhood. These different types of ponds are designed for different purposes. For example, wet ponds primarily provide treatment of stormwater. They also provide good cover and habitat for birds and small mammals, making them fine "wildlife preserves" Dry ponds or infiltration ponds are designed to provide storage for stormwater and gradually release it downstream or allow it to filter into the ground. These types of ponds can be maintained as grassy play areas, and may even be modified to house more formal play equipment. Who is Responsible for Maintaining Stormwater Facilities? All stormwater facilities need to be maintained. Regular maintenance ensures proper functioning and keeps the facility visually appealing. This Stormwater Facility Maintenance Guide was designed to help explain how stormwater facilities work and provide user - friendly, straightforward guidance on how to maintain them. As a homeowner or homeowner's association, you are responsible for regularly maintaining privately owned ponds, catch basins, pipes and other drainage facilities within your subdivision. Stormwater facilities located in public right -of -ways are maintained by local governments. 3 How to Use the Stormwater Facility Maintenance Guide This Maintenance Guide includes a Site Plan specific to your subdivision and a Facility Key that identifies the private stormwater facilities you are responsible for maintaining. A "Quick List" of maintenance activities has also been included to help you identify the more routine needs for your facility. This guide includes: A Glossary that defines terms and explains functions of the various components of stormwater drainage systems; A comprehensive Maintenance Checklist that provides specific details on required maintenance; A section on Pollution Prevention Tips that lists ways to protect water quality and keep storm drain systems functioning smoothly; And a section on Resources that directs you to sources of more information and technical assistance. A Regional Approach to Stormwater Management The Cities of Lacey, Olympia and Tumwater together with Thurston County are taking steps to educate and involve area residents in water quality issues and stormwater management. Stormwater runoff is a widespread cause of water quality impairment and stream degradation. The jurisdictions are working together with residents, businesses, community groups and schools to address this problem. This Guide focuses on providing information on ways that residents and businesses can reduce stormwater impacts through pollution prevention and proper facility maintenance. Everyone needs to help keep waterways and groundwater clean. With proper management and common sense we can continue to enjoy clean, safe streams and drinking water YOUR STORMWATER FACILITIES This section consists of two parts that are to be used together: the Site Plan and the Facility Key. Look on the site plan and identify the numbers which denote a feature of the system. Then look on the facility key to see what that feature is called and which checklist applies. SITE PLAN Developer or Engineer to add site plan here (can either be a customized drawing or copy of the stormwater facility details from the set of as built plans). FACILITY KEY The stormwater facility in your neighborhood is comprised of the following elements: Type of feature & Checklist Name Location on Site Plan Pond Catch Basins, Manholes, and Inlets Fences, Shrubbery Screens, and Gates Grounds and Landscaping Conveyance Pipes, Ditches, and Swales Drywells, French Drains, or Downspouts Access Roads and Easements QUICK LIST The following list is an abbreviated checklist of the most common types of maintenance you should have to do. Please try and go over this checklist after heavy rains. This is a bare minimum and should be done in conjunction with the other checklists in order to make your maintenance program effective. ❑ Check catch basin grates to see that they are not clogged or broken. Remove twigs, leaves, or other blockages. Replace the grate if it is broken. ❑ Check inlet and outlet pipes for blockages. Clear all blockages. ❑ Check berms and pond walls for erosion or caved in areas. Contact for guidance. ❑ Check rip rap rocks at the inlets and outlets. If they are silted in or eroded away, replace them. MAINTENANCE CHECKLISTS The Maintenance Checklists in this packet are for you to use when checking the stormwater facilities in your neighborhood. This packet has been customized so that only the checklists for your facilities are included. If you feel you are missing a checklist, or you have additional facilities not identified or addressed in this packet, please contact your developer or local jurisdiction. The checklists are in a table format for ease of use and brevity. Each checklist tells you what part of the feature to check, how often to check, what to check for, and what to do about it. Log sheets are included toward the end of the chapter to help you keep track of when you last surveyed the storm drainage system. Although it is not intended for the maintenance survey to involve anything too difficult or strenuous, there area few tools that will make the job easier and safer. These tools include: • A flashlight. • A long pole or broom handle. • Some kind of pry bar or lifting tool for pulling manhole and grate covers. • Gloves. A listing of resources is included in the next Chapter. Here you will find the phone numbers of the agencies referred to in the tables, as well as the contractor and consultants that designed and constructed your facilities. SAFETY WARNING: Due to OSHA regulations you should never stick your head or any part of your body into a manhole or other type of confined space. When looking into a manhole or catch basin, stand above it and use the flashlight to help you see. Use a pole or broom handle that is long enough when you are checking sediment depths in confined spaces. NO PART OF YOUR BODY SHOULD BREAK THE PLANE OF THE OPEN HOLE. Ponds There are essentially three kinds of ponds. treatment ponds, infiltration ponds, and detention ponds. Although each pond has unique maintenance requirements, there are also many things they have in common. Part of Pond to Check When to Check it What to Check For What to Do Entire Pond Quarterly Dumping of yard wastes such Remove trash and debris and dispose as grass clippings and of properly. Contact your local Waste branches into basin. Management department for disposal Presence of glass, plastic, information. metal, foam, and coated paper. Entire Pond Quarterly Any vegetation which may Remove invasive or noxious constitute a hazard to the vegetation. Do not spray chemicals on public, such as tansy ragwort, vegetation without obtaining guidance poison oak, stinging nettles, from WSU Cooperative Extension and devilsclub. approval from the City or County. Entire Pond Quarterly Presence of chemicals such First, try and locate the source of the as natural gas, oil, and pollution. Then call the Moderate Risk gasoline, obnoxious color, Waste program at Thurston County odor, or sludge. Environmental Health to report the hazard. Entire Pond Quarterly Sparse, weedy, or overgrown For grassy ponds, selectively thatch, grass in grassy aerate, and re -seed ponds. Grass (dry /infiltration) ponds. should be kept under 8 inches high. Presence of invasive species For wetland ponds, hand -plant or sparse growth of plants in nursery -grown wetland plants in bare wetland ponds. areas. Contact WSU Cooperative Extension for guidance on invasive species. Pond bottoms should have uniform dense coverage of desired plant species. Entire Pond Quarterly Any evidence of rodent holes Destroy rodents and repair the dam or if your facility is acting as a berm. Contact the Thurston County dam or berm. Water should Health Department for guidance. not be able to flow through rodent holes. Entire Pond Quarterly Insects such as wasps and Destroy or remove insects. Contact hornets interfering with WSU Cooperative Extension for maintenance activities, or guidance. mosquitoes becoming a nuisance. Entire Pond Annually Ensure that trees are not Prune tree limbs to allow for interfering with maintenance maintenance. Some trees may be cut (i.e., mowing, silt removal, or for firewood. access.) 10 Inlet Annually Make sure that the rip rap Replace rocks or clean out sediment. under the inlet pipe is intact and that no native soil is exposed. Also check for accumulations of sediment more than % the height of the rocks. Outlet Quarterly The bar screen over the Replace screen if it is not attached. outlet should be intact and Remove any trash or debris and clear of debris. Water should dispose of properly. Clean out the end flow freely through the outlet of pipe if necessary. Contact your pipe. local Waste Management department for disposal information. Side Slopes Annually Check around inlets and Try and determine what has caused outlets for signs of erosion. the erosion and fix it. Stabilize slopes Check berms for signs of by reinforcing the slope with rock, sliding or settling. Action is planting grass, or compacting the soil. needed where eroded Contact WSU Cooperative Extension damage is over 2 inches for guidance on slope reinforcement. deep and where there is potential for continued erosion_ Storage Area Annually Check to see if sediment is Clean out the sediment and re -seed building up on the pond the pond if deemed necessary to bottom. A buried or partially improve infiltration and control erosion. buried outlet structure or very Contact your local jurisdiction's slow infiltration rate probably stormwater maintenance division for indicates significant sediment technical assistance. deposits. Dikes Annually Any part of the dike which Build the dike back to the original has settled significantly. elevation. Emergency Annually Check to see that the rip rap Replace rocks so that all native soil is Overflow /Spill protective area is intact. If covered. way any exposed native soil is present you should repair it. Emergency One Time Side of pond has no rip rap A rip rap spillway should be installed. Overflow /Spill protective area to prevent Contact your local jurisdiction's way erosion during emergency stormwater maintenance division for overflows. guidance. If the facility is less than two years old, this should be the contractor's responsibility. Sediment Quarterly Ensure that sediment and Clean out the sump area. Trapping Area debris do not obstruct water flow into the infiltration area. Sediment One Time stormwater should not enter the infiltration area directly Add a sediment trapping area by constructing a sump for settling of 11 Trapping Area without some method of solids. This settling area should be settling out solids. separate from the rest of the facility. Contact your local jurisdiction's stormwater maintenance division for technical assistance. If the facility is less than a year old, this should be the contractor's responsibility. 12 Catch Basins and Inlets These structures are typically located in the streets and public rights -of -way. Local jurisdictions are responsible for routine maintenance of the pipes and catch basins in rights -of -way, while the homeowners association is responsible for keeping the grates clear of debris in all areas as well as pipes and catch basins in private areas. Part of Catch When to What to Check For What to Do Basin to Check it Check Catch basin During and Trash or debris accumulating in Remove blocking trash or debris opening after major front of the catch basin opening with a rake and clean off the storms and not allowing water to flow in. grate. Catch basin Quarterly Sediment or debris in the basin Clean out the catch basin of should be kept under 50% of the sediment and debris. Contact depth from the bottom of the your local jurisdiction's pipe to the bottom of the basin.. stormwater maintenance division Use a long stick or broom handle for technical assistance. to poke into sediment and determine depth. Inlet and outlet Quarterly Trash or debris in the pipes Clean out inlet and outlet pipes of pipes should not be more than 115 of trash or debris. its height. Also, there should not be any tree roots or other vegetation growing in the pipes. Inlet and outlet Annually There should be no cracks wider Repair cracks or replace the pipe joints than % inch and longer than 1 joints. Contact your local foot at the joint of any inlet or jurisdiction's stormwater outlet pipe. Also check for maintenance division for technical evidence of sediment entering assistance. the catch basin through cracks. Grate Quarterly The grate should not have Replace the grate. cracks longer than 2 inches. There should not be multiple cracks. Frame Quarterly Ensure that the frame is sitting Repair or replace the frame so it flush on top of the concrete is flush with the slab. structure (slab). A separation of more than % inch between the frame and the slab should be corrected. Catch basin Annually Inspect the walls of the basin for Replace or repair the basin. cracks wider than % inch and Contact a professional engineer longer than 3 feet. Also check for evaluation. for any evidence of sediment entering the catch basin through cracks. Determine whether or not the structure is sound. 13 Catch basin Quarterly There should be no chemicals such as natural gas, oil, and gasoline in the catch basin. Check for obnoxious color, odor, or oily sludge. Clean out catch basin. Contact your local jurisdiction or Thurston County Environmental Health if you detect a color, odor, or oily sludge. Oil/Water Quarterly Water surface in catch basin has Remove the catch basin lid and separator significant sludge, oil, grease, or skim off oil layer. Pour oil into a (downturned scum layer covering all or most disposable container, seal elbow or "T" in Quarterly of the water surface. container, wrap securely in catch basin) ensure that it blocks easy newspaper, and place in trash. screen entry to the facility. Make Water surface should be clear of sure erosion hasn't created oily layer. Pipe Elbow Quarterly Top or bottom of pipe appear to Remove the catch basin lid and Shrubbery Quarterly have broken off. Check for any examine the pipe for damage. If screen apparent damage and check to broken, hire a contractor to see if it's plumb. replace pipe in accordance with Wire Fences Annually Look along the length of the approved plans on file with your fence and determine if it is out local jurisdiction. Fencing, Shrubbery Screens, and Gates Fences and shrubbery screens aren't typically required for stormwater ponds. If the slopes of the sides are too steep, usually some kind of barricade is constructed. Part of When to What to Check For What to Do Fencing, Check it Shrubbery, or Gate to Check Fence or Quarterly Inspect the fence or screen to Mend the fence, repair erosion, or shrubbery ensure that it blocks easy replace the shrubs to form a solid screen entry to the facility. Make barrier. sure erosion hasn't created an opening under fence. Shrubbery Quarterly Shrubbery should not be Trim and weed shrubbery to provide screen growing out of control or appealing aesthetics. Do not use infested with weeds chemicals to control weeds. Wire Fences Annually Look along the length of the Straighten posts and rails if fence and determine if it is out necessary. of alignment. Wire Fences Annually Missing or loose tension wire. Replace or repair tension wire so it holds fabric. Wire Fences Annually Missing or loose barbed wire. Replace or repair barbed wire so that it doesn't sag between posts. Wire Fences Annually k for rust or scaling. Paint or coat rusting or scaling parts In with a protective coating. 14 Wire Fences Quarterly Ensure that there are no holes in the fabric or fencing. Repair holes so that there are no openings in the fabric or fencing. Gate Quarterly Ensure that the gate is not Repair or replace the gate to allow broken, jammed, or missing entry of people and maintenance and that it opens easily. equipment. If a lock is used, make sure your local jurisdiction's stormwater maintenance staff have a key. 15 Conveyance Pipes, Ditches, and Swales. Part of System to Check When to Check it What to Check For What to Do Pipes Annually Accumulated sediment should Clean out pipes of all sediment and not exceed 20% of the debris. Remove all vegetation so diameter of the pipe. that water flows freely through Vegetation should not reduce pipes. Repair or replace pipe. For free movement of water long sections of underground pipe through pipes. Ensure that the contact your local jurisdiction's protective coating is not stormwater maintenance division for damaged and rusted. Dents technical assistance. should not significantly impede flow. Pipe should not have major cracks or tears allowing water to leak out. Open ditches Quarterly There should not be any yard Remove trash and debris and waste or litter in the ditch. dispose of them properly. Open ditches Annually Accumulated sediment should Clean out ditch of all sediment and not exceed 20% of the depth debris. Contact your local of the ditch. jurisdiction's stormwater maintenance division for information on sediment disposal. Open ditches & Annually Check for vegetation (e.g., Clear blocking vegetation so that Swales weedy shrubs or saplings) that water flows freely through ditches. reduces the free movement of Grassy vegetation should be left water through ditches or alone. swales. Open ditches & Quarterly Check around inlets and Eliminate causes of erosion. Swales outlets for signs of erosion. Stabilize slopes by using Check slopes for signs of appropriate erosion control sloughing or settling. Action is measures (e.g., reinforce with rock, needed where eroded damage plant grass, compact soil.) is over 2 inches deep and where there is potential for continued erosion. Open ditches & Annually Native soil beneath the rock Replace rocks to design standard. Swales splash pad, check dam, or lining should not be visible. Swales Quarterly Grass cover is sparse and Aerate soils and reseed and mulch weedy, or areas are overgrown bare areas_ Keep grass under 8 with woody vegetation. inches high. Remove woody growth, recontour, and reseed as necessary. Swales Quarterly Swale has been filled in or If possible, speak with homeowner blocked by shed, woodpile, and request that the swale area be shrubbery, etc. restored. Contact your local jurisdiction to report problem if not rectified voluntarily. 16 Swales Annually Water stands in swale or flow A survey may be needed to check Grounds to Check it velocity is very slow. grades. Grades need to be in 1 -5% Check Stagnation occurs. range if possible. If grade is less Landscaped Quarterly Weeds growing out of control in than 1 %, underdrains may need to Areas landscaped area. be installed. Contact your local jurisdiction's stormwater Landscaped Quarterly Check for any presence of maintenance division for technical Areas poison ivy or other poisonous assistance Grounds and Landscaping Part of When to What to Check For What to Do Grounds to Check it Check Landscaped Quarterly Weeds growing out of control in Pull weeds by hand, if possible, to Areas landscaped area. avoid using chemical weed controls. Landscaped Quarterly Check for any presence of Remove poisonous vegetation or Areas poison ivy or other poisonous insect nests that are present in vegetation or insect nests. landscaped area. Landscaped Quarterly There should not be any yard Remove and dispose of litter Areas waste or litter in landscaped properly areas. Landscaped Quarterly Noticeable rills are seen in Identify the causes of erosion and Areas landscaped areas. take steps to slow down or disperse the water. Fill in contour, and seed area. Trees and Annually Limbs or parts of trees or shrubs Trim trees and shrubs to restore shrubs that are split or broken. shape. Replace severely damaged trees and shrubs. Trees and Annually Trees or shrubs that have been Replant trees or shrubs, shrubs blown down or knocked over. inspecting for injury to stem or roots. Replace if severely damaged. Trees and Annually Trees or shrubs which are not Place stakes and rubber - coated Shrubs adequately supported or are ties around young trees /shrubs leaning over, causing exposure for support. of the roots. 17 Access Roads and Easements. Area to Check When to What to Check For What to Do Downspout Check it Water overflows from the First try cleaning out the gutters and General One Time Check to determine if there is If there is not enough access, enough access to your check with your local jurisdiction to stormwater facilities for determine whether an easement maintenance vehicles. exists. If so, a maintenance road may need to be constructed there. Access road Quarterly Debris which could damage Clear all potentially damaging vehicle tires (glass or metal). debris. Access road Annually Any obstructions which reduce Clear along and over roadway so clearance above and along the there is enough clearance. road to less than 14 feet. acid solutions instead of highly toxic Road surface Annually Check for potholes, ruts, mushy Add gravel or remove wood as spots, or woody debris that necessary. limits access by maintenance vehicles. Shoulders and Annually Check for erosion along the Repair erosion with additional soil ditches roadway. or gravel. Drywells, French Drains, or Downspouts Part of system to Check When to Check it What to Check For What to Do Downspout Annually Water overflows from the First try cleaning out the gutters and gutter or downspout during downspouts. If this doesn't solve the rain. problem you may need to install a bigger drywell. Contact your local jurisdiction's stormwater maintenance division for technical assistance. Roof Annually Moss and algae are taking Disconnect the flexible part of the over the shadier parts of the downspout that leads to the drywell. shingles. Then perform moss removal as desired. Pressure wash or use fatty acid solutions instead of highly toxic pesticides or chlorine bleach. Install a zinc strip as a preventative. 18 RESOURCE LISTING If you are unsure whether a problem exists, please contact your local jurisdiction at one of the numbers below and ask for Technical Assistance. Contact Numbers: Olympia Maintenance - 753 -8220 Olympia Water Resources - 753 -8321 or 753 -8598 (24 Hour Number). Pacific Disposal - 352 -2046 Thurston Conservation District - 754 -3588 Thurston County Community & Environmental Programs - 754 -4111 Thurston County Environmental Health (Moderate Risk Waste) - 754 -4111 Thurston County Solid Waste - 786 -5136 Thurston County Storm & Surface Water - 754 -4681 Olympia Public Works — 753 - -8362 WSU Cooperative Extension - 786 -5445 Developer Information: MOUNTAIN TERRACE BUILDERS, L.L.C. 14307 State Route 507 SE Yelm, Washington 98597 (360) 507 -0868 Contact: Mike Kempinski, Member LOG SHEET Use log sheets to keep track of when maintenance checks occur and what items, if any, are repaired or altered. The completed sheets will serve as a record of past maintenance activities and will provide valuable information on how your facilities are operating. This information will be useful for future requirements regarding the types of facilities that are installed. It helps to keep all log sheets in a designated area so they can be easily accessed by others. There are copies of the log sheet in your packet to last one year based on four quarterly and one annual check. There is an additional log sheet in your packet that should be preserved as an original from which to make additional copies as they are needed in the future. If you run out of blank sheets, contact your local jurisdiction and request more. 19 Date Checked Checked By Name: Position in HOA: Address: City: State: Zip: Phone Number. Part of Facility Checked Observations (List things that should be done) Follow -up Actions Taken Date Action Taken 20 ATTACHMENT "B" POLLUTION PREVENTION FOR HOMEOWNERS PURPOSE Many products and practices commonly used in and around our houses are hazardous to both ourselves and the environment. Many of these products can end up in our stormwater systems and groundwater. This document gives alternatives, where possible, for those types of products and practices. The Best Management Practices (BMPs) described here, include "good housekeeping" practices that everyone can use. RECOMMENDED POLLUTION CONTROL PRACTICES FOR HOMEOWNERS It has been said that the average home today contains more chemicals than the average chemical lab of 100 years ago. When many of these chemicals are used industrially, they can be subject to various health and safety standards; yet these same substances are used freely and often carelessly in our homes. The BMPs in this section are divided into four categories: Household Hazardous wastes, Pesticides, Remodeling, and Septic Maintenance. Each section includes information on available alternatives. HOUSEHOLD HAZARDOUS WASTES Many of the cleaning agents, solvents, polishes, etc. used commonly in the home are considered hazardous. These products may be toxic, corrosive, reactive, flammable, and /or carcinogenic. It is critical that these products are handled with care and properly disposed. A list of some common household hazardous materials is presented in Table 1. In addition, many hazardous household chemicals persist for long periods of time in the environment. Manufacturers may truthfully state that a product is "biodegradable "; most products are biodegradable, but what is important is the rate at which they are broken down and the products they are broken down into. The term "biodegradable" on its own is misleading at best, unless the product is rapidly degraded into harmless substances. It is important to note here that the term "biodegradable" currently has no legal definition in this state. This means that any product can use this term according to the manufacturer's own definition. This definition may not be at all similar to the consumer's perception. The following ideas will help you reduce the risks of stormwater and ground water contamination from many household products: 21 HOUSEHOLD PRODUCT MANAGEMENT 1. Read the label of products before you buy them. Toxic product labels will carry many warnings. Either bypass such products or buy them in small quantities. If you cannot use all of the product, try to give it away instead of disposing of it. Thurston County periodically facilitates product exchanges for leftover paints and other hazardous wastes. Call the Thurston County Health Department at 754 -4111 for more information. 2. Buy only those detergents that contain little or no phosphorus. Phosphorus can cause algae blooms if it is washed into lakes, streams, Most detergents which are low or phosphate free are labeled as such. 3. Use no more than the manufacturer's suggested amount of any cleanser. More is not necessarily better. 4. Products such as oven cleanser, floor wax, furniture polish, drain cleaners, and spot removers often contain chemicals that are toxic. Buy the least toxic product available, and use a non -toxic substitute if one can be found. Ovens, for example can be cleaned by applying table salt to spills, then scrubbing with a solution of washing soda and water. Table 2 lists substitutes for many commonly used household products. If it is necessary to use a product that contains toxic chemicals, use the product only as directed. Do not combine products, as they may become more dangerous when mixed (example: mixing chlorine bleach and ammonia produces dangerous gases). Use eye wear and rubber gloves as appropriate. Contact the Hazardous Substance Hotline at 1- 800 - 633 -7585 if you have any questions regarding disposal of a product or empty container. The County has both hazardous waste collection days and permanent facilities where residents can bring hazardous wastes. Call the Thurston County Health Department at 754 -4111 for more information. 5. Chemicals left over from some activities, such as photography and auto repair, are hazardous and should not be flushed down the sink. This is especially important if your home is hooked up to a septic system. Toxic chemicals can kill the bacteria in the tank that treat sewage and pollute water supply wells. 6. Be sure that all containers are clearly marked. 7. Common (not automobile) batteries are one of the largest sources of heavy metals (such as lead, nickel, cadmium, and mercury) found in landfills. Instead of throwing them away, dispose of them at a hazardous waste collection site. AUTOMOTIVE USAGE, CARE AND MAINTENANCE From a waste management standpoint, automobile maintenance is best done by professionals at facilities designed to handle, store, and dispose of the waste products correctly. Many of these facilities do an excellent job of dealing with waste oils, antifreezes, other fluids, batteries and tires. They often charge a small fee to cover the added expenses, but it's worth it. However if you repair your car at home, please consider these helpful tips: 1. Cars should be serviced regularly. Any leaky lines or valves should be replaced. 2. Dumping oil, degreasers, antifreeze, and other automotive liquids into a stream or a storm drain violates city, county and state laws or ordinances. Do not dump them onto the ground because they will end up in stormwater runoff or in groundwater. Do not use oil to reduce dust levels on unpaved areas. Instead, recycle used oil and antifreeze. Keep them in separate containers. Call 22 the Recycling Hotline at 1- 800 - RECYCLE or call the Thurston County Health Department for the location of the nearest recycling center, or call your local automotive service centers to see if they take oil for recycling. Some may also take used oil filters. 3. Wrap empty oil or antifreeze containers in several layers of newspaper, tie securely and place in a covered trash can. Antifreeze is sweet- tasting, but poisonous to people, fish, pets and wildlife. 4. Sweep your driveway instead of hosing it down. Fluids and heavy metals associated with automobiles can build up on driveway surfaces and be washed into local surface or groundwater when driveways are hosed down. 5. When washing vehicles, do so over your lawn or where you can direct soapsuds onto the lawn or another vegetated area to keep the soaps from washing into the storm drain system or local surface water. Your stormwater pond cannot cleanse soapy water from washed cars. 6. Small spills of oil and other fluids can be absorbed by using materials such as kitty litter or sawdust. Wrap the used kitty litter and any contaminated soil in a plastic bag and then place it in the garbage. If a spill reaches surface water, you must notify the nearest regional office of the Department of Ecology Immediately! Southwest Region - Olympia 753 -2353 (24 -hour) or call 911. There are fines for failure to notify the appropriate agency when a spill occurs. 7. De -icing chemicals (various types of salt) can harm concrete less than three years in age, burn vegetation, and be corrosive to cars and other metal objects. Deicing chemicals and their additives can be toxic. Cyanide is formed from the breakdown of a common anti - caking agent used in deicing chemicals. Urea salts are an alternative to other types of salt de- icers, but great care must be used in applying them. These salts contain large quantities of nitrogen, which can severely burn plants and encourage algae growth in lakes and /or Puget Sound, if over - applied. 8. The use of these chemicals should be minimized or avoided. Instead, shovel walks clear and apply a dusting of sand to improve footing. 23 Table 1 Hazardous Household Substances List Auto, Boat and equipment Repair and Remodeling Cleansing Agents Maintenance 1. Adhesives, glues, cements. 1. Oven cleaners 1. Batteries 2. Roof coatings, sealants. 2. Degreasers and spot 2. Waxes and cleansers removers 3. Caulking and sealants. 3. Paints, solvents and thinners 3. Toilet, drain and septic tank 4. Epoxy resins. cleaners 4. Additives 5. Solvent -based paints. 4. Polishes, waxes and 5. Gasoline strippers 6. Solvents and thinners. 6. Flushes 5. Deck, patio and chimney 7. Paint removers and strippers. cleaners 7. Auto repair materials 6. Solvent cleaning fluids 8. Motor oil 9. Diesel oil 10. Antifreeze Pesticides Hobby and Recreation Miscellaneous 1. Insecticides 1. Paints, thinners and solvents 1. Ammunition 2. Fungicides 2. Chemicals (photo and pool 2. Asbestos 3. Rodenticides 3. Glues and cements 3. Fireworks 4. Molluscicides 4. Inks and dyes 5. Wood preservatives 5. Glazes 6. Moss retardants 6. Chemistry sets 7. Herbicides 7. Bottled gas 8. Fertilizers 8. White gas 9. Charcoal starter fluid Source: Guidelines for Local Hazardous Waste Planning, Ecology, No. 87 -18 1987. 24 Table 2 Non -Toxic or Less Toxic Alternatives to Toxic Products Hazardous Product Alternative(s) Air fresheners Set out a dish of vinegar or simmer cinnamon and cloves or set out herbal bouquets or potpourri in open dishes or burn scented candles. Bleach Borax or oxygen bleaches or reduce bleach by % and add - 112C baking soda, or let clothes dry in the sun. Brass polish. Worcestershire sauce. Chrome polish Apple cider vinegar or a paste of baking soda and water or a lemon Coffee pot cleaner Vinegar. Coffee stains Moist salt paste. Copper cleaner Mix lemon juice and salt or use tomato catsup Drain cleaner Use a plunger followed by % C. baking soda mixed in % C. vinegar. Let sit 15 minutes, pour down 2 qt. boiling water. Furniture polish Linseed, olive or almond oils or a mixture of 3 parts olive oil to 1 part white vinegar or a mixture of 1 Tbs. Lemon oil and 1 pint mineral oil. Garbage disposal deodorizer Used lemon rind or baking soda. Glass cleaner Mix 2 Tbs. vinegar with 1 quart water. Grease remover Make a paste of borax on a damp cloth. Ink stain remover Spray with leftover non - aerosol hair spray before washing. Laundry soap Borax, baking soda or washing soda Linoleum floor cleaner 1 C. white vinegar in 2 gals. water. Mildew remover Equal parts vinegar and salt. Mothballs Cedar chips or blocks, or use dried tansy, lavender or peppercorns in drawers and closets. Oil spills Kitty litter, sawdust. Oil stain removal White chalk rubbed into the stain prior to washing. Oven cleaner Pour lots of sit on fresh spills and scrape off after the oven cools. A soda water solution will cut grease. Paint ammonia on spills with a paintbrush, then rinse off. Paint brush softener Hot vinegar. 25 Table 2 Non -Toxic or Less Toxic Alternatives to Toxic Products (Cont.) Hazardous Product Alternative(s) Paint stripper Use mechanical sanding instead of chemical strippers. Paint/grease remover Wear gloves or use baby oil. Pet odor removal Cider vinegar. Pitch or sap remover Butter, margarine or vegetable shortening. Porcelain stain remover Baking soda Refrigerator deodorizer Open box of baking soda. Rug /carpet cleaner (General)Use a soap -based non - aerosol rug shampoo, vacuum when dry. (Spots)Pour on club soda or sprinkle cornmeal or cornstarch on the rug, let sit for at least 30 minutes, then vacuum. Rust removal Lemon juice plus salt plus sunlight. Rusty bolt remover Carbonated beverage. Scorch mark remover Grated onion. Scouring powder Baking soda or a non - chlorine scouring powder. Silver polish Soak silver in warm water with 1 Tbs. soda, 1 Tbs. salt and a piece of aluminum foil. Stainless steel polish Mineral oil. Toilet bowl cleaner Paste of borax and lemon juice. Tub and the cleaner 114 C. soda and % C. white vinegar mixed with warm water. Upholstery spot remover Club soda. Water mark remover Toothpaste. Water softener 114 C, vinegar. 26 PESTICIDES' AND FERTILIZERS Pesticides (such as insecticides and herbicides) and fertilizers are commonly used by homeowners in their quest for bigger, healthier plants and greener, lusher lawns. These chemicals are often overused. Homeowners often apply too much chemical at the wrong time, such as before heavy rains or any time the plants will not be able to absorb all the chemicals. These chemicals are easily introduced into stormwater runoff and can cause algae blooms (fertilizers) or kill off aquatic organisms (pesticides). Fertilizer management Fertilizing a lawn can be done in an environmentally sensitive manner. Here are some ideas: 1. Before fertilizing, test your soil's pH. This can be easily done by using kits that are available, or through tests provided by WSU Cooperative Extension. Use only the recommended amount of fertilizer, and add any soil amendments, such as lime, that are recommended in your test results. 2. Use fertilizers that are appropriate for your area, and for the type of plants you are growing. Work the fertilizer into the soil directly around the plants drip line. By incorporating the fertilizer in the soil, there will be less likelihood of contaminated runoff. Contact the Thurston Conservation District to find out this information. 3. Water before fertilizing. Water enough to dampen the ground thoroughly, but not enough to cause surface runoff. Dampening the soil prevents fertilizer from being washed from the surface of dry soil in the first rain or watering after application 4. Many soils can benefit from the use of organic fertilizers such as compost or peat. Not only do these substances add nutrients to soil, they also increase the porosity of the soil and increase its ability to hold water. 5. Slow release fertilizers (which are generally resin- coated) can be used in addition to organic fertilizers. They are not mobile in the soil, and are only applied once, which saves work. Integrated pest management Rather than bringing out the sprayer whenever a pest infestation occurs in the garden consider using Integrated Pest Management (also known as IPM). IPM emphasizes the evaluation of all factors including environmental effects before chemicals are applied. Pesticides should only be used as a last resort. Some of the tactics that can be used to decrease or eliminate the use of pesticides include: Use of Natural Predators, Pathogens: Because chemical sprays generally kill many beneficial insects instead of just the target pest, it may be necessary to introduce natural predators back into the garden. Ladybugs, lacewings, predatory wasps, and nematodes are all commercially available. Garter snakes and toads are also predators and should not be eliminated from the garden. There are some bacteria, viruses, and insect parasites that are specific to pests and will not harm other insects or animals. A commonly used bacterium in the Puget Sound area is Bacillus thuringiensis (Bt), which is intended to control infestations of tent caterpillars. Products containing Bt are available at your nursery. Habitat Changes: Many times a change of habitat can control pest infestations. Removal of old tires can cut down on the mosquito population by removing a convenient water - filled location for them to breed 1 As used here, the word pesticide can mean any herbicide, insecticide, rodenticide, miticide, or other types of chemicals used in the same manner. 27 in. Crop rotation, even in a small garden, can reduce the number of pest infestations. Removing last year's leaves from under rose bushes can cut down on the incidence of mildew and blackspot, as these fungi overwinter in dead leaves. Timing: Crops that can overwinter (such as leeks or carrots) should be planted in the fall. This gives them time to become established before pests arrive in the spring. Mechanical: Many eggs, larvae, cocoons, and adult insects can be removed by hand. Be sure that the insect is properly identified prior to removing it so that beneficial insects are not destroyed in error. Drowning insects in plain water or spraying them with soapy water are alternatives to squashing them. Resistant Plants: Plants that are native to this area are often more resistant to pests and climate, etc. Than are introduced plants. Many plant cultivars have been developed which are resistant to such diseases as verticilium wilt and peach leaf curl. Grass seed mixes are also available for lawns that need much less watering, mowing, and chemical use. Growing Conditions: Plants, such as hostas, that require some shade are more susceptible to pests when they are growing in the sun. Plants that are not properly fertilized or watered are less vigorous in growth and tend to attract pests. Plants that prefer an acid soil, such as azaleas, will perform better and be less susceptible to pests when they are frown in soil with the proper pH. Chemicals: Chemicals are a small part of the IPM plan and should be applied only as needed after reviewing all other alternatives. Pesticide management When use of a chemical is the best or only option, follow these simple guidelines: 1. Know what pest you are spraying for. Use the pesticide according to the manufacturer's instructions and buy only the quantity needed. Many pesticides have a limited shelf life and may be useless or degrade into even more toxic compounds if kept on the shelf. 2. Do not apply more than the specified amount. Overuse can be dangerous to your health as well as the health of wildlife and the environment. If more than one chemical can be used to control the pest, choose the least toxic. The word "caution" on the label means that the chemical is less toxic than one that is labeled "warning ". 3. Do not spray on windy days, in the morning of what will be a very hot day, or when rain is likely to occur. Herbicides can drift and injure valuable ornamental plants in either your or your neighbor's back yard. Do not water heavily after application. Plants should be lightly watered BEFORE application to prevent burning of the foliage, and to help evenly spread the chemical. 4. Never apply pesticides near streams, ponds, or wetlands (exception: approved applications for aquatic weeds). Do not apply them to bare eroded ground (exception. use of low toxicity herbicides such as Round -up to allow growth of desired planting in small areas). Many pesticides bind to soil particles and can be easily carried into a stream or storm drain. 5. Pesticides should be stored well away from living areas. Ideally, the storage area should have a cement floor and be insulated from temperature extremes. Always keep pesticides in their original containers with labels in tact. Labels often corrode and become illegible in this climate and may have to be taped onto the container. 6. Federal law now requires that all pesticides be labeled with the appropriate disposal method. Leftovers should never be dumped anywhere, including a landfill. Take unwanted pesticides to the County's hazardous waste collection days or Hazo House at the landfill. 28 7. Empty containers should be triple- rinsed and the rinse water used as spray. Once containers are triple- rinsed, they are not considered hazardous waste and may be disposed of in most landfills. However, call your local landfill before putting the container in the garbage. 8. If a pesticide is spilled onto pavement, it can be absorbed using kitty litter or sawdust. The contaminated absorbent should be bagged and labeled and taken to Hazo House. 9. If the pesticide is spilled onto dirt, dig up the dirt, place it in a plastic bag and take it to Hazo House. 10. Many pest control companies and licensed applicators have access to pesticides that are more toxic than those available to the consumer. Check with the company before they spray indoors or outdoors to find out what spray they will be using and what precautions, if any, are necessary after the operator leaves. Home remodeling Remodeling uses some of the most toxic substances found in the home. Paints, preservatives, strippers, brush cleaners, and solvents all contain a wide range of chemicals, some of which are suspected to be carcinogens (cancer- causing). These products should never be dumped in a landfill or put down a sewer or septic system. 1. When building a deck consider using wood instead of concrete. Wood decking allows rainwater to drip onto the ground below, keeping it from becoming surface runoff. 2. Decks and sidewalks can also be built out of brick interlocking pavers or modular concrete. If these surfaces are placed on a bed of well- drained soil gravel or sand, rainwater can infiltrate into the around through them. 3. To reduce disposal problems, buy only the amount you need. Used turpentine or brush cleaner can be filtered and reused. Paint cans should be allowed to dry and then be disposed of during a hazardous waste collection day or at Hazo House. 4. Leftover paint can be given away, for example to a theater group. Contact the Thurston County Health Department at 754 -4111 for other options. 5. Roof downspouts can be adjusted to infiltrate runoff where the soil is well drained. The runoff from them can enter a gravel bed where it can infiltrate into the ground. For design criteria, see your jurisdiction's drainage manual. 6. When gardening on slopes, reduce the potential for surface runoff by using terraces across the face of the hill. These can be as simple as little soil "bumps" or can be elaborate using such products as pressure- treated wood 4x4's or rock walls. Septic system care and management While septic systems do not seem to have a direct relationship with stormwater runoff, they can in some instances be related. 1. Roof drains and stormwater runoff should be diverted away from drainfields. Excess water reduces the capacity of the drainfield to absorb effluent from the septic tank. 2. Water from hot tubs should not be drained into a septic system all at once. They are not designed to handle large volumes of chlorinated water. Either use the water on plants in the yard, or drain the hot tub slowly over a period of days. 29 3. Septic tanks should be pumped regularly. Ponded water, damp places in the yard, foul odors and /or a dark gray or black soil color may indicate septic drain field failure. Effluent from a malfunctioning septic can cause disease and nitrate problems in groundwater. For septic system assistance, contact the Thurston County Health Department at 786 -5490. References Puget Sound Water Quality Authority, Managing Nonpoint Pollution - an Action Plan for Puget Sound Watersheds, 88 -31, June, 1989. Washington State Dept. of Ecology, Water Quality Guide - Recommended Pollution Control practices for Homeowners and Small Farm Operators 87 -30, revised June, 1991. Washington State Dept. of Ecology, Hazardous Waste Pesticides, 89 -41, August, 1989. 30 GLOSSARY BEST MANAGEMENT PRACTICE (BMP) - Structures, conservation practices, or regulations that improve quality of runoff or reduce the impact of development on the quantity of runoff. BIOFILTER (SWALE) - A wider and flatter vegetated version of a ditch over which runoff flows at uniform depth and velocity. Biofilters perform best when vegetation has a thick mat of roots, leaves, and stems at the soil interface (such as grass). BIOFIL TRA TION - The process through which pollutant concentrations in runoff are reduced by filtering runoff through vegetation. BUFFER - The zone that protects aquatic resources by providing: protection of slope stability, attenuation of runoff, and reduction of landslide hazards. An integral part of a stream or wetland ecosystem it provides shading, input of organic debris, and coarse sediments to streams. It allows room for variation in stream or wetland boundaries, habitat for wildlife, and protection from harmful intrusion. CATCH BASIN - An inlet for stormwater set into the ground, usually rectangular and made of concrete, and capped with a grate that allows stormwater to enter. CHECK DAM - A dam (e.g., rock, earthen, log) used in channels to reduce water velocities, promote sediment deposition, and /or enhance infiltration. COMPOST STORMWA TER FILTER - A treatment facility that removes sediment and pollutants from stormwater by percolating water through a layer of specially prepared bigleaf maple compost. Clean water exits the bottom of the facility through a pipe, while stormwater flows in excess of the facility design overflow the compost bed and bypass the facility. CONSTRUCTED WETLAND - A wet pond with dead storage at varied depths and planted with wetland plants to enhance its treatment capabilities. CONTROL STRUCTURE OR FLOW RESTRICTOR - A manhole and /or pipe structure with a flow - regulating or metering device such as a weir or plates with small holes known as orifices. This structure controls the rate at which water leaves the pond. CONVEYANCE - A mechanism or device for transporting water including pipes, channels (natural and man - made), culverts, gutters, manholes, etc. CRITICAL AREA - Areas such as wetlands, streams, steep slopes, etc. as defined by ordinance or resolution by the jurisdiction. Also known as environmentally sensitive areas. CULVERT - A conveyance device (e.g., concrete box, pipe) which conveys water from a ditch, swa /e, or stream under (usually across) a roadway or embankment. DEAD STORAGE - The volume of storage in a pond below the outlet which does not drain after a storm event. This storage area provides treatment of the stormwater by allowing sediments to settle out. DETENTION FACILITY - A facility (e.g., pond, vault, pipe) in which surface and storm water is temporarily stored. DETENTION POND - A detention facility in the form of an open pond. DISPERSION TRENCH - An open -top trench filled with riprap or gravel that takes the discharge from a pond, spreads it out, and spills (bubbles) the flow out along its entire length. Dispersion trenches are used to simulate "sheet flow" of stormwater from an area, and are often used to protect sensitive adjacent areas, such as wetlands. 31 DRAINAGE SYSTEM - The combination of Best Management Practices (BMPs), conveyances, treatment, retention, detention, and outfall features or structures on a project. DROP STRUCTURE - A structure for dropping water to a lower elevation and /or dissipating energy. A drop may be vertical or inclined. DRY POND - A detention facility that drains completely after a storm. This type of pond has a pipe outlet at the bottom. EASEMENT- A right afforded a person to make limited use of another's real property. Typical easements are for pipes or access to ponds, and may be 15 to 20 feet wide. EMERGENCY OVERFLOW OR SPILLWAY - An area on the top edge of the pond that is slightly lower in elevation than areas around it. This area is normally lined with riprap. The emergency overflow is used only if the primary and secondary outlets of the pond fail, in the event of extreme storms, or if the infiltration capability of the pond becomes significantly diminished. If the emergency overflow ever comes into play, it may indicate the pond needs to be upgraded. ENERGY DISSIPATER - A rock pad at an outlet designed to slow the velocity, spread out the water leaving the pipe or channel, and reduce the potential for erosion. FREEBOARD - The vertical distance between the design high water mark and the elevation of the top of the pond. Most ponds have one to two feet of freeboard to prevent them from overflowing. INFILTRATION - The soaking of water through the soil surface into the ground (percolation is essentially the same thing). Many ponds are designed to infiltrate or retain stormwater, and thus do not have a regularly used discharge pipe. INFILTRATION FACILITY (OR STRUCTURE) - A facility (pond or trench) which retains and percolates stormwater into the ground, having no discharge (to any surface water) under normal operating conditions. JUNCTION - Point where two or more drainage pipes or channels converge (e.g., a manhole). JURISDICTION - Olympia, Lacey, Tumwater, or Thurston County (as applicable). LINED POND OR CONVEYANCE - A facility, the bottom and sides of which have been made impervious (using, for example, a plastic liner or clay /silt soil layer) to the transmission of liquids. LIVE STORAGE - The volume of storage in a pond above the outlet which drains after a storm event. This storage area provides flood control and habitat protection for nearby streams. MANHOLE - A larger version of a catch basin, often round, with a solid lid. Manholes allow access to underground stormwater pipes for maintenance. NATURAL CHANNEL - Stream, creek, river, lake, wetland, estuary, gully, swale, ravine, or any open conduit where water will concentrate and flow intermittently or continuously. OIL -WATER SEPARATOR -A structure or device used to remove oil and greasy solids from water. They operate by using gravity separation of liquids that have different densities. Many catch basins have a downturned plastic elbow that provides some oil -water separation. OUTFALL - The point where water flows from a manmade conduit, channel, or drain into a water body or other natural drainage feature. RETENTION FACILITY - An infiltration facility. 32 RETENTION POND - A retention facility that is an open pond. REVETMENTS - Materials such as rock or keystones used to sustain an embankment, such as in a retaining wall. RIP RAP - Broken rock, cobbles, or boulders placed on earth surfaces, such as on top of a berm for the emergency overflow, along steep slopes, or at the outlet of a pipe, for protection against the action of water. Also used for entrances to construction sites. RUNOFF - Stormwater SAND FILTER - A treatment facility that removes sediment and pollutants from Stormwater by percolating water through a layer of sand. Clean water exits the bottom of the facility through a pipe, while stormwater flows in excess of the facility design overflow the sand bed and bypass the facility. STORMWATER - That portion of precipitation that falls on property and that does not naturally percolate into the ground or evaporate, but flows via overland flow, channels or pipes into a defined surface water channel, or a constructed infiltration facility. Stormwater includes washdown water and other waste water that enters the drainage system. SWALE - A shallow drainage conveyance with relatively gentle side slopes, generally with flow depths less than one foot. This term is used interchangeably with "BIOFILTER ". TRASH RACK OR BAR SCREEN - A device (usually a screen or bars) that fits over a pipe opening to prevent large debris such as rocks or branches from entering and partially blocking the pipe. WET POND - A stormwater treatment pond designed with a dead storage area to maintain a continuous or seasonal static water level below the pond outlet elevation. 33