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

csotelo@waterboards.ca.gov

(916) 322-1400

Construction General Permit

Monitoring and Reporting Requirements

Project Risk Determination

LOW MED HIGH

LOW Level 1 Level 2

HIGH Level 2 Level 3

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 2 Requirements

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 ggearheart@waterboards.ca.gov 916/341-5892

ImplementationAnnalisa Kihara akihara@waterboards.ca.gov

916/324-6786E-reporting

Patrick Otsuji potsuji@waterboards.ca.gov 916/341-5292