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Draft Phase II Small MS4 General Permit
Water Quality Monitoring & Assessment
Jonathan BishopChief Deputy Director Director
State Water Resources Control Board
Overview of California• Over 200 Traditional MS4s designated• Over 1000 Non-traditional MS4s anticipated to be designated
North Bay Watershed
• Approximately 7 Phase II municipalities potentially affected in North Bay Watershed
• Anticipated that all municipalities will be brought under the MRP in the next permit cycle
Summary of Significant Changes
• Specific Permit Language• Automatic designation for NTMS4s• Automatic designation for Discharges to ASBS• Urbanized area determined by the 2010 U.S. Decennial Census • Program Management Section• Industrial/Commercial Inspection Program• Risk-Based approach to Post-Construction Storm Water
Management/Hydromodification• TMDLS• Water Quality Monitoring and Assessment • Program Effectiveness Assessment• Standardized Annual Report Format
Concepts Influencing Proposed Monitoring Approach
• Data is needed to inform municipal actions for water quality protection/improvement
• Data may include information related to:receiving watersMS4 dischargesPerformance of BMPs
• Volumes, rates, and duration of storm water flow should be considered pollutants when developing a monitoring program
• Monitoring must be relevant to the biological health of the receiving waters.
• Characterization of pollutants in urban storm water runoff is generally well established (e.g., types, loading, concentrations): There is limited need to conduct new characterization monitoring.
• Need to better understand the short- and long- term performance of emerging technologies especially those that are being increasingly utilized by municipalities (e.g., Low Impact Development).
Concepts Influencing Proposed Monitoring Approach
AMBIENT CONDITIONS (RECEIVING WATERS)
• Limited parameters (habitat, selected chemical constituents, flow and/or biological health)
• Partnerships with other stakeholders are encouraged to leverage limited resources
• Incentives for Regional Monitoring Collaboratives
• SWAMP
Proposed Approach
Tentative Timeline
Early Spring 2011: Administrative Draft
Late Spring 2011: Public Draft
Early Summer 2011: Public workshops
Winter 2011: Permit Adoption
Six months or up to One Year from Permit Adoption: Revise SWMPs to conform to new permit requirements
Phase II Contact Information
Christine Sotelo, Phase II Program Manager
(916) 322-1400
Risk Level 1 Monitoring Requirements
Visual Monitoring:
• Non Stormwater Discharge • Non-Visible Pollutants• Weekly visual inspections/Inspection
Checklist• Inspections every 24 hours during rain
event
Risk Level 2 Monitoring RequirementsRisk Level 1 Requirements, PLUS
• Effluent Monitoring:
A minimum of 3 samples per day collected from discharges subsequent to a qualifying rain event (producing precipitation of ½ inch or more at the time of discharge).
ATS effluent sampling if applicable (later slide)
Preservation and handling in compliance with “Standard Methods for the Examination of Water and Wastewater” –American Public health Association & SWAMP Quality Assurance Program Plan (QAPrP)
NAL exceedance reporting – samples submitted to RWQCB within 10 days, report upon request
Risk Level 3 Monitoring RequirementsRisk Level 2 Requirements, PLUS
• Numeric Effluent Limitations pH, Turbidity
NEL violation reports to RWQCB within 24 hours, sampling results within 5 days after event
• Receiving Water Monitoring NEL exceedance and direct discharge to
receiving waters (upstream and downstream)
• Bioassessment (limited cases) 30 acres or larger & direct discharge to
receiving waters Requirements in Appendix 3 of the General
Permit
5. Compliance Storm Event
Permit Establishes a 5 year, 24 hour compliance storm event
exception from NEL’s
6. Active Treatment Systems (ATS)
• Specific Requirements for ATS use in Attachment F of Permit
• NEL’s based on effective ATS performance:10 NTU – Daily Flow Weighted Average 20 NTU – Single Sample
• Compliance Storm Event: 10 year 24 hour
• Proper Personnel Training
CGP Contact InformationProgram Management
Greg Gearheart [email protected] 916/341-5892
ImplementationAnnalisa Kihara [email protected]
916/324-6786E-reporting
Patrick Otsuji [email protected] 916/341-5292