0
California stormwater permit requirements<br />Michael Josselyn, PhD PWS<br />WRA, Inc.<br />November 2009<br />
Purpose of presentation<br />How is stormwater regulated in California?<br />
Purpose of presentation<br />How is stormwater regulated in California?<br />What  require-ments have been set by state go...
Purpose of presentation<br />How is stormwater regulated in California?<br />What  require-ments have been set by state go...
Water quality regulations<br />
Federal: Clean Water Act<br />Enacted in 1972 to protect nation’s water quality<br />Act prohibits the discharge of pollut...
stormwater regulations<br />
Legal actions modify CWA<br />Congress issues Clean Water Act 1972<br />EPA decides not to regulate stormwater due to prob...
State of California<br />State Water Resources Control Board is responsible for overall water management in the state<br /...
Regional Authority<br />State divided into regions based on watershed boundaries<br />Each region responsible for separate...
California construction General Stormwater Permit<br />Established by State Water Resources Control Board<br />September 2...
Why focus on construction sites?<br />20 to 1000 times more sediment from construction sites<br />Turbidity increases<br /...
General permit: construction sites<br />Covers earth moving activities &gt; 4000 sq m<br />Regulates the amount of sedimen...
Establishes Risk Levels<br />Increasing level of protection <br />Sediment Risk =  Type of activity and location of activi...
Establishes Risk Levels<br />Increasing level of protection <br />Sediment Risk =  Type of activity and location of activi...
Establishes Risk Levels<br />Increasing level of protection <br />Sediment Risk =  Type of activity and location of activi...
Sediment risk<br />Based on soil erosion factor<br />Calculated using Revised Universal Soil Loss Equation (RUSLE)<br />Co...
Revised universal soil loss equation<br />A = R * K * LS * C * P<br />A = the rate of sheet and rill erosion<br />
Revised universal soil loss equation<br />A = R * K * LS * C * P<br />A = the rate of sheet and rill erosion<br />R = rain...
Revised universal soil loss equation<br />A = R * K * LS * C * P<br />A = the rate of sheet and rill erosion<br />R = rain...
Revised universal soil loss equation<br />A = R * K * LS * C * P<br />A = the rate of sheet and rill erosion<br />R = rain...
Revised universal soil loss equation<br />A = R * K * LS<br />A = the rate of sheet and rill erosion<br />R = rainfall-run...
Sediment loss risk factors<br />Determine Value of A and relate risk below<br />
Receiving water risk<br />Most sensitivity to sedimentation<br />Fish spawning areas<br />Fish migration areas<br />Any im...
High RiSK = More controls<br />Use Standard Construction BMPs<br />Silt fences, hay bales, temporary detention<br />Additi...
NUMERIC LIMITS<br />Turbidity<br />Action level = 250 NTU<br />Limit level = 500 NTU<br />Exceed Action Levels<br />Improv...
Turbidity measurement<br />
Minimize hydromodification<br />Runoff Project Water Flow<br />Pre Project Flows = Post Project Flows<br />Up to the 85th ...
Must submit stormwater plan:SWPPP<br />Must be prepared by a qualified individual<br />Evaluates Risk Factors<br />Describ...
Watershed regulations<br />Wetland and Stream Protection<br />
Water quality regulations<br />
Wetland and stream fill protections<br />401 Water Quality Certification<br />
Wetland and stream fill protections<br />401 Water Quality Certification<br />Must approve loss of wetlands and streams in...
Wetland and stream fill protections<br />401 Water Quality Certification<br />Porter Cologne Act<br />Must approve loss of...
Wetland and stream fill protections<br />401 Water Quality Certification<br />Porter Cologne Act<br />Must approve loss of...
Watershed level regulation<br />No net loss of wetland and stream habitat<br />Requires that any loss be “mitigated”<br />...
Mitigation policies<br />Must create new wetlands and streams in greater quantity than lost—”Mitigation Ratio”<br />Wetlan...
Wetland mitigation areas<br />Freshwater marsh<br />Riparian and Meadow Habitat<br />
Also applies to tidal areas<br />Batiquitos Lagoon<br />Channel Construction<br />
Wetland creation technology<br />Has expanded significantly over past 20 years<br />Many wetland types<br />Freshwater mar...
Mitigation banks<br />Established by private companies<br />Determine areas where development is occurring<br />Create wet...
Summary of state regulations<br />Strictly regulates construction activities<br />Sets methods to evaluate risk levels ass...
Upcoming SlideShare
Loading in...5
×

California State Stormwater Permit Requirements

3,604

Published on

Description of new 2009 California Stormwater Permit requirements

Published in: Real Estate
0 Comments
1 Like
Statistics
Notes
  • Be the first to comment

No Downloads
Views
Total Views
3,604
On Slideshare
0
From Embeds
0
Number of Embeds
1
Actions
Shares
0
Downloads
49
Comments
0
Likes
1
Embeds 0
No embeds

No notes for slide

Transcript of "California State Stormwater Permit Requirements"

  1. 1. California stormwater permit requirements<br />Michael Josselyn, PhD PWS<br />WRA, Inc.<br />November 2009<br />
  2. 2. Purpose of presentation<br />How is stormwater regulated in California?<br />
  3. 3. Purpose of presentation<br />How is stormwater regulated in California?<br />What require-ments have been set by state government?<br />
  4. 4. Purpose of presentation<br />How is stormwater regulated in California?<br />What require-ments have been set by state government?<br />How are these regulations implemented?<br />
  5. 5. Water quality regulations<br />
  6. 6. Federal: Clean Water Act<br />Enacted in 1972 to protect nation’s water quality<br />Act prohibits the discharge of pollutants from a point source into “waters of the United States”<br />Unless a permit is obtained by the discharger<br />Environmental Protection Agency is given power to issue and enforce regulations<br />Permit program has been delegated to the State of California—NPDES permits<br />States also given power to approve wetland fill<br />
  7. 7. stormwater regulations<br />
  8. 8. Legal actions modify CWA<br />Congress issues Clean Water Act 1972<br />EPA decides not to regulate stormwater due to problems inherent in regulating many outfalls<br />Environmental organizations win law suits to have stormwater regulated under NPDES<br />Congress amends Clean Water Act 1987<br />Industrial stormwater discharges regulated<br />EPA considers construction activities to be industrial actions<br />1990 EPA mandated that construction activities be regulated under NPDES permits<br />
  9. 9. State of California<br />State Water Resources Control Board is responsible for overall water management in the state<br />Defines stormwater as a <br /> “pollutant” and as a <br /> “point source”<br />Subject to permitting under NPDES <br /> regulations<br />One source of stormwater<br /> is from construction sites<br />September 2009: New regulations<br /> for construction activities<br />
  10. 10. Regional Authority<br />State divided into regions based on watershed boundaries<br />Each region responsible for separate “basin plans”<br />Regulate water quality to ensure beneficial uses of the streams and lakes in its region<br />
  11. 11. California construction General Stormwater Permit<br />Established by State Water Resources Control Board<br />September 2, 2009<br />
  12. 12. Why focus on construction sites?<br />20 to 1000 times more sediment from construction sites<br />Turbidity increases<br />Nutrient input higher<br />Sediment buildup in storm drainage devices<br />
  13. 13. General permit: construction sites<br />Covers earth moving activities &gt; 4000 sq m<br />Regulates the amount of sediment that can be discharged from construction sites<br />Sets standards for the discharge of certain pollutants<br />Turbidity and pH<br />Establishes a “design storm criteria”<br />Sets forth requirements related to risk level<br />Requires submission of Storm Water Quality Pollution Prevention Plan (SWPPP)<br />
  14. 14. Establishes Risk Levels<br />Increasing level of protection <br />Sediment Risk = Type of activity and location of activity<br />Receiving Water Risk = “Sediment sensitivity” of water body<br />
  15. 15. Establishes Risk Levels<br />Increasing level of protection <br />Sediment Risk = Type of activity and location of activity<br />Receiving Water Risk = “Sediment sensitivity” of water body<br />
  16. 16. Establishes Risk Levels<br />Increasing level of protection <br />Sediment Risk = Type of activity and location of activity<br />Receiving Water Risk = “Sediment sensitivity” of water body<br />
  17. 17. Sediment risk<br />Based on soil erosion factor<br />Calculated using Revised Universal Soil Loss Equation (RUSLE)<br />Considers<br />Rainfall<br />Soil Erodibility<br />Length-slope factor<br />Cover factor<br />Sediment controls<br />
  18. 18. Revised universal soil loss equation<br />A = R * K * LS * C * P<br />A = the rate of sheet and rill erosion<br />
  19. 19. Revised universal soil loss equation<br />A = R * K * LS * C * P<br />A = the rate of sheet and rill erosion<br />R = rainfall-runoff erosivityfactor<br />
  20. 20. Revised universal soil loss equation<br />A = R * K * LS * C * P<br />A = the rate of sheet and rill erosion<br />R = rainfall-runoff erosivity factor<br />K = soil erodibility factor<br />LS = length-slope factor<br />K/ LS Factor map for California<br />
  21. 21. Revised universal soil loss equation<br />A = R * K * LS * C * P<br />A = the rate of sheet and rill erosion<br />R = rainfall-runoff erosivity factor<br />K = soil erodibility factor<br />LS = length-slope factor<br />C = Cover Factor<br />P = Protection Measures employed<br />
  22. 22. Revised universal soil loss equation<br />A = R * K * LS<br />A = the rate of sheet and rill erosion<br />R = rainfall-runoff erosivity factor<br />K = soil erodibility factor<br />LS = length-slope factor<br />C = Cover Factor = 1 for risk assessment<br />P = Protection Measures employed = 1<br />
  23. 23. Sediment loss risk factors<br />Determine Value of A and relate risk below<br />
  24. 24. Receiving water risk<br />Most sensitivity to sedimentation<br />Fish spawning areas<br />Fish migration areas<br />Any impaired water body for sediment<br />
  25. 25. High RiSK = More controls<br />Use Standard Construction BMPs<br />Silt fences, hay bales, temporary detention<br />Additional Factors to be added<br />Ensure soil loss during each phase does not exceed preconstruction soil loss<br />More frequent inspections<br />Develop Rain Event Action Plans to prepare site within 48 hours in advance of rain events<br />Must meet numeric standards for Turbidity and pH<br /> Establishes both action and limitation values<br />
  26. 26. NUMERIC LIMITS<br />Turbidity<br />Action level = 250 NTU<br />Limit level = 500 NTU<br />Exceed Action Levels<br />Improve BMPs and implement corrective actions<br />Exceed Limit Levels<br />Additional monitoring and possible fines<br />pH<br />Action level = 6.5-8.5 <br />Limit level = 6.0 – 9.0<br />
  27. 27. Turbidity measurement<br />
  28. 28. Minimize hydromodification<br />Runoff Project Water Flow<br />Pre Project Flows = Post Project Flows<br />Up to the 85th percentile storm event<br /><ul><li>Must consider both construction and post project features</li></ul>Use of detention basins<br />Use of LID features<br />Maintaining natural vegetation and stream configurations within projects<br />
  29. 29. Must submit stormwater plan:SWPPP<br />Must be prepared by a qualified individual<br />Evaluates Risk Factors<br />Describes all the best management practices<br />Describes compliance<br /> plan<br />Provides for monitor-<br />ing and reporting<br />
  30. 30.
  31. 31. Watershed regulations<br />Wetland and Stream Protection<br />
  32. 32. Water quality regulations<br />
  33. 33. Wetland and stream fill protections<br />401 Water Quality Certification<br />
  34. 34. Wetland and stream fill protections<br />401 Water Quality Certification<br />Must approve loss of wetlands and streams in watersheds regulated by federal government<br />Must try to avoid and minimize impacts<br />Fill must be accompanied by wetland and stream replacement<br />Usually 2 to 3 times as much land as filled<br />
  35. 35. Wetland and stream fill protections<br />401 Water Quality Certification<br />Porter Cologne Act<br />Must approve loss of wetlands and streams in watersheds regulated by federal government<br />Must try to avoid and minimize impacts<br />Fill must be accompanied by wetland and stream replacement<br />Usually 2 to 3 times as much land as filled<br />
  36. 36. Wetland and stream fill protections<br />401 Water Quality Certification<br />Porter Cologne Act<br />Must approve loss of wetlands and streams in watersheds regulated by federal government<br />Must try to avoid and minimize impacts<br />Fill must be accompanied by wetland and stream replacement<br />Usually 2 to 3 times as much land as filled<br />Regulates fill placement in wetlands and streams<br />Cannot result in decreased beneficial uses<br />Fish habitat<br />Human use and health<br />Water quality<br />
  37. 37. Watershed level regulation<br />No net loss of wetland and stream habitat<br />Requires that any loss be “mitigated”<br />Replacement areas must be in same watershed<br />
  38. 38. Mitigation policies<br />Must create new wetlands and streams in greater quantity than lost—”Mitigation Ratio”<br />Wetlands and stream creation must maintain or reduce hydromodification<br />Wetland must be created similar to that which is lost<br />Performance standards must be met over 5 year monitoring program<br />
  39. 39. Wetland mitigation areas<br />Freshwater marsh<br />Riparian and Meadow Habitat<br />
  40. 40. Also applies to tidal areas<br />Batiquitos Lagoon<br />Channel Construction<br />
  41. 41. Wetland creation technology<br />Has expanded significantly over past 20 years<br />Many wetland types<br />Freshwater marsh<br />Riparian habitat<br />Vernal pools<br />Streams<br />New policies in effect to improve science and performance<br />
  42. 42. Mitigation banks<br />Established by private companies<br />Determine areas where development is occurring<br />Create wetland and stream habitat<br />May include habitat for unique plants and animals<br />Sell credits on the open market to private parties and governmental agencies<br />Must maintain these areas in perpetuity<br />
  43. 43. Summary of state regulations<br />Strictly regulates construction activities<br />Sets methods to evaluate risk levels associated with various activities<br />Establishes numeric standards for some attributes<br />Seeks to control hydromodification<br />Incorporate features in project design to control flow<br />Regulates stream and wetland fill<br />Requires habitat replacement through mitigation<br />Sets standards for reporting and monitoring<br />
  1. A particular slide catching your eye?

    Clipping is a handy way to collect important slides you want to go back to later.

×