W O O L P E R T

Managing NPDES Phase II Requirements on a County-

Wide Basis

Jared Livingston

W O O L P E R T What I am Going to Talk About:

• Brief overview of NPDES Storm Water Phase II.

• What outfalls are and how they are being mapped for Hamilton County.

• Which of the Minimum Control Measures this project helps to fulfill and how.

• Role of GIS.• The lessons we have learned.• The benefits of joining forces.

W O O L P E R TOverview of NPDES Stormwater Phase II

• What is NPDES Stormwater Phase II?

• Who is required to comply with NPDES Phase II?

• What does the NPDES permit require?

• What are the six Minimum Control Measures?

W O O L P E R TWhat is NPDES Stormwater Phase II?

Permitting system that places controls on operators of small regulated municipal separate storm sewers systems (MS4s) in order to improve the water quality of discharges from their storm sewer facilities.

W O O L P E R TWho is required to comply

with NPDES Phase II?

1. Regulated small MS4s - MS4s located within “urbanized area” and having a population between 50,000 and 100,000.

2. MS4s located outside an urbanized area and serving a population of at least 10,000.

3. MS4s located outside an urbanized area that connect to a regulated small MS4.

W O O L P E R TWhat does the NPDES permit

require?

Implementation of a storm water management plan (SWMP) including, at minimum, selection and execution of appropriate Best Management Practices (BMPs) and measurable goals for each of the six minimum control measures. The ultimate goals of the SWMP are:

• Reduction of pollutant discharge to the “maximum extent practicable” (MEP).

• Protection of water quality.• Compliance with the water quality

standards of the Clean Water Act.

W O O L P E R TWhat are the six Minimum

Control Measures?

1. Public Education and Outreach2. Public Participation/Involvement3. Illicit Discharge Detection and

Elimination4. Construction Site Runoff Control5. Post Construction Runoff Control6. Pollution Prevention/Good

Housekeeping

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What is an outfall and how are Hamilton County’s outfalls being mapped?

An outfall is the place where storm water is discharged into receiving waters. An outfall can be a pipe or the mouth of a stream.

W O O L P E R T

What is an outfall and how are Hamilton County’s outfalls being mapped?

Hamilton County’s outfalls are being mapped using a combination of differential GPS and Woolpert’s proprietary field data collection software, SmartSurveyor™.

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What is an outfall and how are Hamilton County’s outfalls being mapped?

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Which of the 6 Minimum Control Measures are being addressed and

how?

1. Public Education and Outreach

2. Public Participation/Involvement

3. Illicit Discharge Detection and Elimination

4. Construction Site Runoff Control

5. Post Construction Runoff Control

6. Pollution Prevention/Good Housekeeping

W O O L P E R TIllicit Discharge Detection and

Elimination

• Storm sewer system map showing all outfalls.

• Dry weather screening

• Documentation of actions and results

W O O L P E R TPollution Prevention/Good

Housekeeping

Discovering the source of illicit discharges found while mapping outfalls can be used as a starting point for compliance with this minimum control measure. It would help to identify the most effective BMPs by targeting known problem areas.

W O O L P E R TWhat is the role of GIS in the arena

of NPDES Phase II Compliance?

+ +

GIS provides a multi-faceted, dynamic repository for NPDES outfall data.

W O O L P E R T What lessons have we learned?

• Ideal times of year to perform field mapping operations: late spring through early fall.

•GPS signal surprisingly strong under summer canopy.

•Perform field mapping operations during dry weather conditions.

•Collect EVERYTHING you see.• It is a two person job.•Not all attributes collected in the

field need to be included in the GIS data set.

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Benefits of joining forces to fulfill NPDES Stormwater

Phase II requirements

• Share authority to pass and enforce legislation.

• Share knowledge.

• Share costs.

• Maximize efficiency.

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Questions?