Stormwater BMP Monitoring Protocol

Stormwater BMP Monitoring ProtocolCoastal Stormwater Supplement Training

OutlineOverviewThe Need for Coastal BMP MonitoringMonitoring Protocol OutlineMonitoring Program CoordinationLocal Example

OverviewPurposeAssist local governments and the development community in defining the effectiveness of stormwater management practices used in the coastal plain physiographic region

Stormwater BMP PerformanceThe National Pollutant Removal Performance Database, Version 2 (Winer, 2000) included 139 individual BMP performance studies published through 2000A number of BMP performance studies have been published since 200027 studies were reviewed and added to the NPRPD* in Sept. 2007Data not selected for coastal regionStormwater BMP Performance

Stormwater BMP PerformanceMuch 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 regionStormwater BMP Performance

The Need for Coastal Monitoring ProtocolSmall 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 helpFill data gapsBetter define the performance of coastal BMPsImprove the way that coastal BMPs are designed and maintained

Monitoring ProtocolProtocol walks through the process of developing and conducting a monitoring program

9Monitoring Protocol Process/Outline

Monitoring Protocol OutlineSection 1.0: Introduction

Section 2.0: Monitoring Program DevelopmentDetermining Data NeedsSelecting Monitoring SitesSelecting Monitoring ParametersSelecting Equipment

Section 3.0: Monitoring ProceduresCharacterize Site ConditionsSelect Monitoring PointsCollect SamplesPerform Laboratory AnalysisData Evaluation and Management

Section 4.0: Budgeting

11Monitoring Program CoordinationNPDES Phase I & II MS4 PermitsPost Construction Runoff Control Inspection & MaintenanceE&S Control InspectionsNPDES Industrial General Permit303 (d) listed waterway samplingQuarterly water quality monitoringTMDL Implementation PlansSWMP Implementation Effectiveness (Phase I, TMDL, etc.)

Bluffton, SC ExampleRequired by the Town Stormwater Management OrdinanceConstructionMay require continuous Turbidity monitoringTown visual inspections of sites minimum of twice per monthEngineer monthly reporting of weekly inspection/correctionsPost Construction36 months of sampling of pollutant loadsReport findings to TownFailure to meet pre-development loadings will require corrective actionMaintenance/operation planTown has right to inspect/monitorBluffton, SC ExampleRequired by the Town Stormwater Management OrdinanceExisting developmentsTown has the right to sample dischargesMay be required to monitor if high levels of pollutants are identified in dischargeCorrective actions can be required