Stormwater BMP Monitoring Protocol

1. Stormwater BMP Monitoring Protocol Coastal Stormwater Supplement Training

2. Outline • Overview • The Need for Coastal BMP Monitoring • Monitoring Protocol Outline • Monitoring Program Coordination • Local Example

3. Overview • Purpose…Assist local governments and the development community in defining the effectiveness of stormwater management practices used in the coastal plain physiographic region

4. Stormwater BMP Performance • The National Pollutant Removal Performance Database, Version 2 (Winer, 2000) included 139 individual BMP performance studies published through 2000 • A number of BMP performance studies have been published since 2000 • 27 studies were reviewed and added to the NPRPD* in Sept. 2007

5. Stormwater BMP Performance Data not selected for coastal region

6. Stormwater BMP Performance • Much of the data (~78%) in the updated NPRPD came from outside of the coastal plain physiographic region. • Where more than a handful of coastal plain studies are available, the data generally shows that the pollutant removal rates provided by coastal BMPs are lower than those provided by BMPs in other physiographic regions.

7. Stormwater BMP Performance Data specific to the coastal region

8. The Need for Coastal Monitoring Protocol • Small number of coastal BMPs found in the database highlights the need for additional BMP performance research (Novotney, 2007) • Approach presented in the monitoring protocol can help…Fill data gaps • Better define the performance of coastal BMPs • Improve the way that coastal BMPs are designed and maintained

9. Monitoring Protocol Protocol walks through the process of developing and conducting a monitoring program

10. Monitoring Protocol Process/Outline

11. Monitoring Protocol Outline • Section 1.0: Introduction • Section 2.0: Monitoring Program Development • Determining Data Needs • Selecting Monitoring Sites • Selecting Monitoring Parameters • Selecting Equipment • Section 3.0: Monitoring Procedures • Characterize Site Conditions • Select Monitoring Points • Collect Samples • Perform Laboratory Analysis • Data Evaluation and Management • Section 4.0: Budgeting

12. Monitoring Program Coordination • NPDES Phase I & II MS4 Permits • Post Construction Runoff Control Inspection & Maintenance • E&S Control Inspections • NPDES Industrial General Permit • 303 (d) listed waterway sampling • Quarterly water quality monitoring • TMDL Implementation Plans • SWMP Implementation Effectiveness (Phase I, TMDL, etc.)

13. Bluffton, SC Example Required by the Town Stormwater Management Ordinance • Construction • May require continuous Turbidity monitoring • Town visual inspections of sites minimum of twice per month • Engineer monthly reporting of weekly inspection/corrections • Post Construction • 36 months of sampling of pollutant loads • Report findings to Town • Failure to meet pre-development loadings will require corrective action • Maintenance/operation plan • Town has right to inspect/monitor

14. Bluffton, SC Example Required by the Town Stormwater Management Ordinance • Existing developments • Town has the right to sample discharges • May be required to monitor if high levels of pollutants are identified in discharge • Corrective actions can be required