1 / 22

BACWA Wet Weather Management Workshop

BACWA Wet Weather Management Workshop. BACWA Workshop San Leandro, CA May 28, 2008 Presentation By – Ken Greenberg U.S. Environmental Protection Agency. Where Are We and What Has Changed?. Nothing Has Changed Clean Water Act prohibits spills Clean Water Act prohibits WWTP bypass

carl
Download Presentation

BACWA Wet Weather Management Workshop

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. BACWAWet Weather Management Workshop BACWA Workshop San Leandro, CA May 28, 2008 Presentation By – Ken Greenberg U.S. Environmental Protection Agency

  2. Where Are We andWhat Has Changed? Nothing Has Changed • Clean Water Act prohibits spills • Clean Water Act prohibits WWTP bypass • Cities and Districts continue to serve customers by conveying sewage to WWTPs

  3. What Has Changed? • 2004 RWQCB 13267 letters • SSO reporting • SSMP development • Statewide WDR (SSO reporting, SSMPs) • Blending restrictions • EPA inspections and enforcement • Jan/Feb ‘08 storms - Publicity • Collection systems implement SSMPs

  4. SSOs

  5. California Statewide General WDR for Sanitary Sewer Systems • Sewer System Management Plans • Organization & Legal Authority • O&M Program • SSO Response Plan • FOG Control Program • Capacity Evaluation and Assurance • SSMPs will help systems improve • Proliferation of “Best Practices” • Help secure necessary funding and resources

  6. GENERAL WDR - SSO Reporting CIWQS SSO Database – “the power of information”: • The public “right to know” • Recognition of best performers • Motivation to improve • Statistics/data analysis • Data available to regulators and NGOs

  7. Blending • Bypass of WWTP units during peak wet weather flow • EPA proposed policy: • on hold at OMB • permit provisions based on bypass regulation • anticipated bypass if no feasible alternatives • RWQCB issued NPDES permits mirror proposed blending policy/bypass regulation • Goal: reduce blending with feasible infrastructure renewal and WWTP improvements

  8. EPA National Priorities • Sustainable Infrastructure • Compliance and Enforcement Priorities: • CAFOs • Storm Water • Combined Sewer Overflows (CSOs) • Sanitary Sewer Overflows (SSOs) • www.epa.gov/compliance/planning/priorities/

  9. EPA’s Performance-Based Strategy for SSOs, FY05 to 07 Goal 1: Protect health and water quality in priority watersheds • 75% of EPA SSO enforcement in priority watersheds Goal 2: Protect public investment in wastewater infrastructure by ensuring proper CMOM • “Address” systems to ensure adequate CMOM at 100% of large systems (>100 mgd) and 10% of medium systems (10 to 100 mgd) • “Address” = inspect or inspect and enforce

  10. EPA’s Performance-Based Strategy for SSOs, FY08 to 10 Goal 1: Protect health and water quality in priority watersheds Goal 2: Protect public investment in wastewater infrastructure by ensuring proper CMOM • “Address” systems to ensure adequate CMOM at 100% of large systems (>100 mgd) and 50% of medium systems (10 to 100 mgd) • “Address” = inspect or inspect and enforce

  11. EPA Inspections:SF Bay Area 2007/2008 • 27 systems inspected • Targeted based on spill rates and WW peaking factors • Findings: • Wet weather capacity problems - SSOs and WWTP impacts • Frequent blockage spills • Aging/deteriorating pipes • Fragmented governance - small districts • SSMP - path to improvement

  12. “The Power of Information”So. Cal./Arizona Spill Rates

  13. SF Bay Region SSO Data • Median = 9.6 SSO/100 miles/year (from CIWQS 7/07 to 4/08) • Capacity related spills in Jan/Feb ‘08: • Storms bring increase in number and volume of spills • Jan/Feb ‘08 - 493 spills, 12.3 MG • Mar/Apr ‘08 - 241 spills, 211,000 gal • WWTP blending and overflows

  14. Sewerage Agency of Southern Marin Almonte SD Alto SD Homestead Valley SD Mill Valley, City of Richardson Bay SD Tamalpais CSD Sausalito-Marin City Sanitary District Sausalito, City of Tamalpais CSD EPA Enforcement Orders – April 2008

  15. Sanitary Districts of Southern Marin

  16. Southern Marin Orders • Findings • Wet weather spills and WWTP bypasses • Frequent blockage spills • Aging/deteriorated pipes • Fragmented governance (9 districts/cities flow to 2 WWTPs)

  17. Fragmented Governance • Small districts (6 miles of pipe) • Limited staff and equipment • Reliance on maintenance contractors • Fees sufficient to support pipe replacement? • Treatment fees based on EDU (little incentive to control I/I) • Missed opportunities

  18. Southern Marin Orders • Spill response plans • Sewer cleaning (increase hot spot cleaning) • Short-term contingency plans • CCTV and condition assessment • Capacity assessment • Capacity management plan • Rehab/replacement plan (long-term sustainable renewal)

  19. Spill Reduction and Wet Weather Management • Short-term spill reduction: • Sewer cleaning and FOG control • Information management • Assessment: • CCTV condition assessment • Flow measurement/capacity assessment • Long-term Spill and Blending Reduction • Sustainable infrastructure renewal vs • Convey/storage/treatment • Collaboration/consolidation of fragmented agencies

  20. SSMP Will Spur Infrastructure Renewal: Rehab/Replace Rate

  21. QUESTIONS or COMMENTS Ken Greenberg, EPA Region 9 415-972-3577 greenberg.ken@epa.gov On the web: www.epa.gov/region09/water/npdes/compliance.html www.epa.gov/npdes/sso

More Related