BACWA Wet Weather Management Workshop - PowerPoint PPT Presentation

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BACWA Wet Weather Management Workshop

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Title: CAPACITY, MANAGEMENT, OPERATIONS & MAINTENANCE Author: R9 EPA Last modified by: Leslie Greenberg Created Date: 5/17/2002 10:57:29 PM Document presentation format – PowerPoint PPT presentation

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Title: BACWA Wet Weather Management Workshop


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
  • OM 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
EPAs 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 (gt100 mgd) and 10 of medium
    systems (10 to 100 mgd)
  • Address inspect or inspect and enforce

10
EPAs 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 (gt100 mgd) and 50 of medium
    systems (10 to 100 mgd)
  • Address inspect or inspect and enforce

11
EPA InspectionsSF 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 InformationSo. 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
EPA Enforcement Orders April 2008
  • 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

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
(No Transcript)
21
SSMP Will Spur Infrastructure Renewal
Rehab/Replace Rate
22
QUESTIONS or COMMENTS
  • Ken Greenberg, EPA Region 9
  • 415-972-3577
  • greenberg.ken_at_epa.gov
  • On the web
  • www.epa.gov/region09/water/npdes/compliance.html
  • www.epa.gov/npdes/sso
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