Stormwater Management Water from rain events drains along roadways, parking lots, and other surfaces out to nearby waterways Runoff to storm sewers can carry sediment, silt, debris, oils, chemicals, and other pollutants Systems known as BMPs (Best Management Practices) are built at schools, residential developments, and many other sites to manage, filter, and control these rain events and runoff
Stormwater Management Stormwater management consists of the use of structural and non-structural practices to reduce pollutant loads resulting from increased surface runoff due to precipitation. MS4s are a component of the National Pollutant Discharge Elimination System (NPDES). MS4 = Municipal Separate Storm Sewer Systems MS4s a re systems designed to collect and convey stormwater, and are made up of storm drains, pipes, ditches, etc.
Regulation Stormwater management is regulated by the EPA
EPA Regulation EPA-Under the Clean Water Act EPA delegates authority to State Agency State Agency issues MS4 Permit (Phase I or Phase II) to individual locality based on population density. Locality develops ordinance to enforce Post Construction BMP (stormwater ponds and structures). Maintenance to hold Property Owner accountable.
Stormwater Guidelines Develop set of Best Management Practices (BMP’s) for each of the components of the Stormwater Program. Identify measurable goals for component. Designate an individual responsible for the program.
Total Maximum Daily Load (TMDL) A TMDL or Total Maximum Daily Load is a calculation of the maximum amount of a pollutant that a water body can receive and still meet water quality standards, and an allocation of that amount to the pollutant's sources. The Clean Water Act, section 303, establishes water quality standards and TMDL programs.
Meet TMDLs and Stay in Compliance with BMPs There are many types of TMDLs including: – Fecal Coliform – Organics and Metals – Biochemical Oxygen Demand – Oil and Grease – Total Suspended Solids – PCBs BMP’s function to help control TMDLs and limit water pollution
Where do Pollutants Come From? Schools conduct numerous activities that can pose a threat to water quality if practices and procedures are not in place to prevent pollutants from entering the MS4
Pollutant Sources These activities include but are not limited to: Winter road maintenance Infrastructure work Building and Landscaping maintenance Waste disposal and maintenance Vehicle maintenance Improper nutrient management
Road/Sidewalk Salt Salt can produce high sodium and chloride concentrations in ponds and lakes –Responsible for unnecessary fish kills Road salt can be lost to moisture, and should not be stored in areas exposed to water, and are not within a close proximity of salt sensitive environments A permanent underoof structure is the best option for road salt storage
Road/Sidewalk Salt Storage Keep unopened bags of salt in areas away from water Store unused materials in a sealable container to prevent moisture contamination
Road/Sidewalk Salt Storage Tarp large quantities of Salt, must be stored on a non-porous surface
Landscaping and Infrastructure Work Where necessary, use the proper tools to limit pollutant ad sediment leakage into runoff areas. Hay BalesSilt Fence
Landscaping and Infrastructure Work Stabilization techniques are necessary in highly erodible areas Runoff from these sites should contain minimal sediment
Landscaping and Nutrient Management A nutrient management plan consists of: –Proper nutrient applications rates –Selection of timing and application methods to reduce runoff –Safe nutrient storage and handling A nutrient management plan is necessary to reduce eutrophication from contaminated runoff, or creation of dead zones in streams, ponds, and lakes
Landscaping and Nutrient Management Timing of application, and application rates of fertilizer can maximize efficiency, save money, and reduce contamination of runoff The optimum fertilizer application time for most plants is in early spring before growth begins, or shortly after the plants have begun growing. Apply fertilizer just before light, steady rains
Landscaping and Nutrient Management Fertilizers and pesticides can be applied using Tractors Sprayers Spreaders The proper Personal Protective Equipment (PPE) is essential for anyone handling these chemicals Keep skin covered Long sleeves Gloves Eyewear Lung and respiratory exposure should be kept at a minimum
Storage of Fertilizers and pesticides Fertilizers and pesticides should be labeled, and stored separately Avoid mixing fertilizers and pesticides Fertilizer and pesticide materials should be stored in dry locations
Use sealable containers for unused materials Containers for fertilizer and pesticides should be distinguishable from one another Storage of Fertilizers and pesticides
Store materials in a secure area, and maintain records of time(s) and quantities used
Materials Management Responsible management of common chemicals, such as fertilizers, solvents, paints, cleaners, and automotive products, can significantly reduce polluted runoff Identify all Hazardous and Non-hazardous materials at facility Label all containers Make special note on inventory of materials that require special handling, storage, or disposal
Materials Management Dispose of chemicals in the proper manner Properly label all chemicals to ensure proper storage, handling, and disposal Proper storage, handling, and disposal decreases pollutant loads and increases safety
Vehicle Maintenance Vehicle Maintenance contributes largely to the Oil and Grease TMDL Minimize oil in stormwater runoff by using items such as towels and cat litter to adsorb the material
Vehicle Maintenance Oils are detectable by their visible sheen and their odor Coolant will be found underneath vehicles as green, red, orange, and rust colored liquids
Notable Issues It is important to be aware of structural components of stormwater management Structures will degrade and become less functional over time.
Maintenance Schedule – Dry Pond Routine Maintenance Non-Routine Maintenance Task Frequency Task Frequency Remove accumulated debris & litter QuarterlyRemoved accumulated sediment/pollutants 2-10 yrs Mow, with heights less than 6-8 inches 2 /yrDethatch grass to remove accumulated sediments 2 yrs Remove woody vegetation from all dam & embankment areas Spring/FallAerate compacted area to promote infiltration 2-3 yrs Stabilize/revegetate side area As NeededReplace components; reconstruct embankments yrs Fill animal burrowsASAP
Maintenance Schedule – Wet Pond Routine MaintenanceNon-Routine Maintenance Task Frequency Task Frequency Remove accumulated debris & litter QuarterlyRemoved accumulated sediment/pollutants 5-15 yrs Mow, with heights less than 6- 8 inches 2 /yrReplace mechanical components 20 yrs Remove woody vegetation from all dam & embankment areas Spring/FallReconstruct embankments & spillways yrs Stabilize/revegetate side areaAs NeededControl AlgaeWhen Identified Fill animal burrowsASAPRemove invasive wetland vegetation When identified Lubricate mechanical components AnnualRepair FenceWhen identified
Maintenance Schedule – Underground Systems Routine MaintenanceNon-Routine Maintenance TaskFrequencyTaskFrequency Remove accumulated debris & litter from contributing areas QuarterlyRemove accumulated sediments from sediment chamber 1-2 yrs Ensure contributing areas are not sources of vehicle fluids QuarterlyRemove and replace top few inches of sand 1-2 yrs Replace concrete shell20-50 yrsReplace filter media, replace underdrains 20 yrs Stabilize/revegetate contributing areas As Needed
Prevention is Key Good Housekeeping Public Education Public Involvement Policies and Procedures Inspections Training
Inspections Inspect project sites Before After During Inspections look for Pollutant sources Pollutant source mediation Pollutant reducing practices Maintain records of pollutant sources, spills or incidents, and pollutant reduction practices
Conclusions Pollutants are materials we interact with on a day to day basis. It is important to reduce the quantities that escape into our stormwater system Prevention is key in managing TMDLs and reducing or eliminating pollutants in stormwater runoff Prevention can be accomplished through handling, storing, and disposing of materials in the proper manner Maintaining strict policies and procedures will ensure that inspection standards are met Take action If you see a spill or materials that are not stored correctly, take the appropriate steps to mediate the situation
Upcoming SCPS and Stafford County Events Friends of the Rappahannock Fall River Clean up- October 19, 2013 Old Mill Park- Fredericksburg Check website- for year round events as well as Kids on the Rappahannock Summer Day Camps.www.riverfriends.org Stafford County 350 th Anniversary- 2014
Contact Stacy Gentry Assistant Director Operations & Maintenance Phone: (540) x 112