STORMWATER BMP MONITORING PROTOCOLCoastal Stormwater Supplement Training

Outline

Overview The Need for Coastal BMP

Monitoring Monitoring Protocol

Outline Monitoring Program

Coordination Local Example

Overview Purpose…Assist local governments and

the development community in defining the effectiveness of stormwater management practices used in the coastal plain physiographic region

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

Data not selected for coastal region

Stormwater BMP Performance

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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.

Data specific to the coastal region

Stormwater BMP Performance

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

Monitoring Protocol

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

Monitoring Protocol

Process/Outline

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

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.)

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

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