3 epa elg for const sites ksa 2010 w hidden slides


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3 epa elg for const sites ksa 2010 w hidden slides

  1. 1. Construction & Development Effluent Guidelines December, 2009 Jesse W. Pritts USEPA Office of Water
  2. 2. Overview <ul><li>EPA promulgated effluent limitations guidelines and new source performance standards for discharges from construction and development (C&D) sites on December 1, 2009. </li></ul><ul><li>New rule requires all construction sites subject to permits to implement erosion and sediment controls and pollution prevention measures </li></ul><ul><li>Phase-in requirement for sites to sample stormwater discharges and comply with a numeric effluent limitation (NEL) of 280 nephelometric turbidity units (NTU). </li></ul><ul><ul><li>Beginning August 1, 2011 sites disturbing 20+ acres at once </li></ul></ul><ul><ul><li>Beginning February 2, 2014 sites disturbing 10 acres at once </li></ul></ul><ul><li>Requirements must be incorporated into state permits (general or individual) whenever permits are re-issued </li></ul><ul><li>EPA intends to issue a new CGP in June 2011 </li></ul>Page
  3. 3. Effluent Limitations Guidelines (ELGs) Page <ul><li>Technology-based standards for control of wastewater and stormwater discharges from various categories of industry </li></ul><ul><li>Not risk-based, so we don’t set different standards for different waterbodies – however, we can subcategorize industry </li></ul><ul><li>Can be numeric standards (i.e., discharge limitations) and/or Best Management Practices (BMPs) and process changes </li></ul><ul><li>Apply to direct dischargers as well as indirect dischargers (to POTWs) </li></ul><ul><li>Different standards can apply to new sources vs. existing sources </li></ul><ul><li>ELGs are incorporated into permits and serve as the national technology “floor” for all dischargers. Where ELGs are not sufficient to meet water quality, water quality based effluent limitations may apply. </li></ul>
  4. 4. Background – Existing Regulations <ul><li>EPA regulates stormwater runoff from construction sites through National Pollutant Discharge Elimination System (NPDES) permits </li></ul><ul><li>EPA issues permits in 4 states, territories and certain tribal lands (EPA Construction General Permit, or CGP) – most states have their own permits </li></ul><ul><li>All construction sites disturbing 1 or more acre are required to obtain permits </li></ul><ul><li>Many states also have regulations addressing construction site stormwater runoff </li></ul><ul><li>Most existing permits require that erosion and sediment controls be installed and maintained, but don’t contain specific performance requirements. Design manuals contain detailed specifications. </li></ul><ul><li>Some states (California, Washington, Oregon, Vermont, Georgia) have numeric action levels/benchmarks for pollutants such as turbidity and require monitoring </li></ul><ul><li>California has an enforceable effluent limit of 500 NTUs that applies to some sites (categorized as Risk Level 3). </li></ul><ul><li>Some watersheds (Lake Tahoe) and waterbodies require dischargers to meet numeric effluent limits for turbidity or other pollutants </li></ul>Page
  5. 5. Existing Benchmarks/Action Levels/Monitoring Requirements Page State/Area Monitoring Requirement Benchmark/Action Level California Monitoring of discharges from every storm event of 0.5 inch or more for Risk Level 2 (pH and turbidity) and Risk Level 3 (ph, turbidity and SSC) sites 250 NTU (500 NTU NEL for Risk Level 3 sites) Oregon Discharges to 303(d) listed waters or TMDL for sediment or turbidity Weekly for turbidity or transparency 160 NTU Washington Weekly for turbidity and pH 25 NTU 250 NTU Vermont Moderate risk sites Visual inspection after every event producing runoff – if visible discharge of sediment is present, implement additional BMPs. If discharge continues, sampling is required. 25 NTU Georgia Monitoring of receiving waters or outfalls for first storm of 0.5 inch or greater and again 90 days later or after completion of mass grading Varies based on site size and watershed size (20 – 750 NTU)
  6. 6. State CGP Expirations Page States Expiration Year South Dakota, Maine, Alabama, Michigan, Indiana, North Dakota, Pennsylvania, North Carolina 2009 or already expired Connecticut, New York, Tennessee, Oregon, Washington 2010 Delaware, Wyoming, South Carolina, Vermont, Wisconsin, Arkansas, Kansas, Montana, New Hampshire, New Mexico, Idaho, Massachusetts 2011 Missouri, New Jersey, Colorado, Oklahoma, Nevada, Iowa, Hawaii, West Virginia, Nebraska 2012 Arizona, Ohio, Texas, Utah, Georgia, Ilinois, Minnesota, Rhode Island, Maryland 2013 Florida, Kentucky, Virginia, California, Louisiana 2014
  7. 7. Erosion and Sediment Control Requirements <ul><li>Control stormwater volume and velocity within the site to minimize soil erosion; </li></ul><ul><li>Control stormwater discharges to minimize erosion at outlets and downstream channel and streambank erosion; </li></ul><ul><li>Minimize the amount of soil exposed during construction activity; </li></ul><ul><li>Minimize the disturbance of steep slopes; </li></ul><ul><li>Design, install and maintain erosion and sediment controls considering factors such as precipitation and soil characteristics; </li></ul><ul><li>Provide and maintain natural buffers around surface waters, direct stormwater to vegetated areas to increase sediment removal and maximize stormwater infiltration, unless infeasible; and </li></ul><ul><li>Minimize soil compaction and, unless infeasible, preserve topsoil. </li></ul>Page
  8. 8. Soil Stabilization and Dewatering Requirements <ul><li>Initiate stabilization of disturbed areas immediately whenever any clearing, grading, excavating or other earth disturbing activities have permanently ceased, </li></ul><ul><li>Initiate stabilization immediately when earth disturbing activities have temporarily ceased and will not resume for a period exceeding 14 calendar days. </li></ul><ul><li>In arid, semiarid, and drought-stricken areas where vegetative stabilization is infeasible, alternative stabilization measures must be employed. </li></ul><ul><li>Discharges from dewatering activities, including discharges from dewatering of trenches and excavations are prohibited unless managed by appropriate controls. </li></ul>Page
  9. 9. Pollution Prevention Requirements <ul><li>Minimize the discharge of pollutants from equipment and vehicle washing, wheel wash water, and other wash waters. Wash waters must be treated in a sediment basin or alternative control that provides equivalent or better treatment prior to discharge; </li></ul><ul><li>Minimize the exposure of building materials, building products, construction wastes, trash, landscape materials, fertilizers, pesticides, herbicides, detergents, sanitary waste and other materials present on the site to precipitation and to stormwater; </li></ul><ul><li>Minimize the discharge of pollutants from spills and leaks and implement chemical spill and leak prevention and response procedures. </li></ul>Page
  10. 10. Prohibited Discharges <ul><li>Wastewater from washout of concrete, unless managed by an appropriate control; </li></ul><ul><li>Wastewater from washout and cleanout of stucco, paint, form release oils, curing compounds and other construction materials; </li></ul><ul><li>Fuels, oils, or other pollutants used in vehicle and equipment operation and maintenance; and </li></ul><ul><li>Soaps or solvents used in vehicle and equipment washing. </li></ul>Page
  11. 11. Surface Outlets <ul><li>When discharging from basins and impoundments, utilize outlet structures that withdraw water from the surface, unless infeasible. </li></ul>Page
  12. 12. Turbidity Limitation and Monitoring <ul><li>Turbidity limitation of 280 NTUs applies to sites that disturb 10 or more acres of land at one time </li></ul><ul><ul><li>Beginning August 1, 2011 applies to sites with 20+ acres disturbed at one time </li></ul></ul><ul><ul><li>On February 2, 2014 applies to sites with 10+ acres disturbed at one time </li></ul></ul><ul><li>Limit is based on polymer-assisted settling, but permittees can use any technology </li></ul><ul><li>Limitation is an Daily Maximum Value (not tied to background) </li></ul><ul><li>Daily value at each discharge point is calculated by averaging all samples at that point </li></ul><ul><ul><li>Individual samples can be above 280 NTU as long as average is below 280 NTU </li></ul></ul><ul><li>Can use zero discharge (such as infiltration, discharge to forested or vegetated buffers) </li></ul><ul><li>Permittees can phase land disturbing activities to stay below the disturbed acreage threshold </li></ul>Page
  13. 13. Turbidity Limitation and Monitoring <ul><li>Limitation does not apply to interstate natural gas pipeline projects </li></ul><ul><li>Monitoring frequency is up to the permitting authority, but EPA recommends at least 3 grab samples per day at each discharge point </li></ul><ul><li>EPA has not specified any analytical methods, but envisions that use of a properly calibrated field turbidity meter is adequate </li></ul><ul><li>For linear projects, permitting authority can consider representative sampling instead of sampling at each discharge point </li></ul>Page
  14. 14. Sampling Requirements <ul><li>Sampling frequency is up to the permitting authority, but EPA recommends that at least 3 samples per day be collected at each discharge point when a discharge is occurring only during normal working hours </li></ul><ul><li>Sampling required at each discrete discharge point (basins, channels, pipes, etc.) </li></ul><ul><li>Sampling of sheetflow or diffuse runoff is not required as long as it does not become channelized prior to discharge </li></ul><ul><li>Sampling methods are up to the permitting authority, field turbidity meter is sufficient </li></ul><ul><li>Limitation does not apply on days with precipitation exceeds the local 2-year, 24-hour storm event </li></ul><ul><li>For linear projects, permitting authorities can consider representative sampling, instead of sampling at each discharge point </li></ul>Page
  15. 15. More Information <ul><li>C&D Web Page </li></ul><ul><li>http://www.epa.gov/waterscience/guide/construction/ </li></ul><ul><ul><li>Jesse Pritts </li></ul></ul><ul><ul><li>[email_address] </li></ul></ul><ul><ul><li>202-566-1038 </li></ul></ul>Page