Provision C.3. New and Redevelopment Performance Standards

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Provision C.3.New and Redevelopment Performance
Standards

• Sue Ma
• Water Quality Control Board
• San Francisco Bay Region
• November 15, 2006

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C.3. New and RedevelopmentControversial Issues

• 5000 ft2 threshold for requiring treatment
• Reporting Databases
• Small projects
• Regulated projects
• OM inspections

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C.3. New and Redevelopment Controversial Issues

• Single-family home requirements
• OM inspections - new treatment systems
• Alternative compliance program
• Impracticability, oversight, current programs
• Lack of LID requirements
• 3rd party certifications of treatment designs
• Infiltration limitations

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Impervious Surface DataProject Categories

• Group 1 Projects gt 1 acre
• Group 2 Projects gt 10,000 ft2 lt 1 acre
• Small Projects lt 10,000 ft2
• Single-Family
• Non Single-Family

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City of FairfieldNew Impervious Surface146.3
AcresFiscal Year 2004 - 2005
0.2 acres
144 acres
2.1 acres
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Suisun CityNew Impervious Surface56.5
AcresFiscal Year 2004 - 2005
54.6 acres
0.5 acres
0.5 acres
1.4 acres
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City of DublinNew/Replaced Impervious
Surface25.5 AcresJanuary December 2005
23.9 acres
0.2 acres
1.4 acres
0.2 acres
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City of LivermoreNew/Replaced Impervious Surface
49.1 AcresJanuary December 2005
0.52 acres
39 acres
1.1 acres
9 acres
0.59 acres
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City of Pleasanton3-Year SummaryNew/Replaced
Impervious Surface88.7 AcresJanuary 2003
November 2005
0.4 acres
69.7 acres
4.0 acres
3.6 acres
15.0 acres
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City of Pleasanton3-Year SummaryNew/Replaced
Impervious SurfaceSmall Projects, 4.0
AcresJanuary 2003 November 2005
78 (3.16 acres) gt 5000 ft2 lt10,000 ft2 (95
single-family res.) 2.99 acres (5 non
single-family res.) 0.17 acres
22 (0.87 acres) lt 5000 ft2 (71 single-family
res.) 0.62 acres (29 non single-family res.)
0.25 acres
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City of Menlo Park5-Year SummaryNew Impervious
Surface14.7 AcresApril 2000 March 2005
10.2 acres
3.1 acres
10.7 acres
0.9 acres
0.5 acres
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City of Menlo Park4-Year SummaryNew Impervious
SurfaceSmall Projects, 10.7 AcresApril 2000
March 2005
7 (0.8 acres) gt 5000 ft2 lt10,000 ft2 (all
single-family res.)
93 (9.9 acres) lt 5000 ft2 (95 single-family
res.) 9.4 acres (5 non single-family res.)
0.5 acres
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City of Palo Alto4-Year SummaryNew/Replaced
Impervious Surface43.3 AcresOctober 2001
December 2005
19.34 acres
13.7 acres
21.5 acres
8.1 acres
2.12 acres
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City of Palo Alto4-Year SummaryNew/Replaced
Impervious SurfaceSmall Projects, 21.5 Acres
October 2001 December 2005
87 (18.8 acres) lt 5000 ft2 (92 single-family
res.) 17.34 acres (8 non single-family res.)
1.42 acres
13 (2.7 acres) gt 5000 ft2 lt10,000 ft2 (74
single-family res.) 2 acres (26 non
single-family res.) 0.7 acres
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Conclusions

• Current data represents small percentage of Bay
  Area cities
• Data illustrates two extremes
• Capturing all impervious surfaces requires
  threshold to be lt 1000 ft2 of impervious surface
• 5000 ft2 threshold for requiring stormwater
  treatment will have small impact
• Some site design requirements appropriate for
  single-family homes

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MRP Provisions

• Threshold for treatment reduced to gt 5000 ft2
  new/replaced impervious surface
• Site Design BMPs required for single-family homes
  creating/replacing gt 5000 ft2 new/replaced
  impervious surface
• Implementation in 4th year of MRP adoption
• Required data collection for new/replaced
  impervious surface for small projects

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MRP Provisions

• List of BMPs for Single-Family Homes
• Divert roof runoff to vegetated areas before
  discharge to storm drain
• Direct surface flow to vegetated areas before
  discharge to storm drain
• Install driveways, patios and walkways with
  pervious material such as pervious concrete or
  pavers

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Alternative Compliance

• Preserves intent in current permits
• Eliminates variability and levels playing field
• Preserves preference for onsite treatment or
  compliance at Regional Project
• Allows finding of impracticability based only on
  cost or inability to meet other federal, state or
  local requirements
• Maintains reduction in requirements for special
  projects (Brownfields, low income, transit
  villages, etc.)

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Operation and Maintenance

• Requirements
• Inspect newly installed treatment BMPs
• Inspect minimum percentage
• Coordinate with vector control agencies
• Determine compliance rates

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Reporting

• Regulated Projects Sample reporting tables were
  distributed 1½ years ago most data already being
  collected and reported
• OM More specific data for inspections
  (compliance status and enforcement actions)
  allows a more quantitative effectiveness
  evaluation by programs and Water Board
• Small Projects Impervious Data Data serves to
  validate MRP thresholds and provide database for
  next permit reissuance