Source Identification

Stormwater Work GroupMarch 24, 2010

The Strategy Chapter 2.6.3 Source ID Monitoring is not only monitoring, but

the monitoring informs the management action process

Source ID is a diagnostic tool with a feedback loop to locate sources, remove, confirm

Key Components1. Evaluate existing data to determine stormwater problem

sources/impairments2. Prioritize Failed Endpoints/Impairments3. Identify the Stressor4. Set a Target for Source Reduction5. Locate the Source(s)6. Plan and Implement Source Removal Action(s)7. Establish Follow-up “Monitoring”8. Incorporate New Monitoring for Prioritization

EPA Stressor Identification

Implementation

Existing Information/Data Prioritize on the WRIA scale Develop a prioritization method via modeling or scoring

(Ecology Watershed Characterization Project is a possibility) based upon resources, beneficial uses.

Info for prioritizing: TMDLs, 303(d), IDDE results, Industrial DMRs, Shellfish Protection Classification, Superfund/MTCA, etc. There is a trigger to enter the Source ID Loop

Identify the Stressor This can be a simple process or require research/extensive

monitoring Use EPA Causal Sequence Biological-Weight of Evidence, Chemical-Work up the system

i.e. Shellfish bed downgrade in rural area, sample up the stream system. Identify farm with 100 stock animals and creek flowing through the pasture.

OR i.e. B-IBI lower than biological potential, drill down to identify the

cause. Aquatic Scientist analyzes peripheral data. Additional monitoring may be needed.

Nature of the Source Each source will have a different framework for

identification, monitoring, removal, and feedbackCopper-optimum control at regulatory level.Fecal coliform-optimum control at the local level.

Set the Goal

Requires a QAPP or Recovery Plan, or implement existing program

Example: Low B-IBI score, what is the biological potential in that system?

Locate the Source(s) Performed in the “plan” Further monitoring, mapping, modeling, etc. may

be required to refine the location of the source. Move “upstream” in the system to refine the

location.

Remove the Source(s) Implement Management Actions, plans, existing

programs. Share successful source removal/reduction

programs/activities Puget Sound-wide. More effective IDDE screening parameters,

programs that result in high illicit discharge detection.

Monitoring Requirements Establish adequate monitoring for feedback Establish “focused” monitoring to measure

progress or determine problem locations Monitoring will be unique for each stressor

identified

Incorporate New Monitoring S&T programs provide new information of failed

endpoints/impairments Effectiveness programs may provide new

information of failed endpoints/impairments

S&T Endpoint

Indicator Source ID Process

Failed Endpoint/Indicator

Hypothesis Identification, prioritization and removal of

stormwater sources result in improved targeted biological endpoints or impairments.

Receiving water S&T monitoring in targeted watersheds results in early source removal program implementation.

Timeline Prioritization-2012 Plans-2013 Begin/continue management actions-2013 S&T Monitoring Year 1 and 2 results/analysis 2016-Work on new problem areas identified by

S&T or local additional monitoring.

Roles and Responsibilities Permittees-WRIA Lead, participate in

prioritization, lead Source ID projects in their MS4 areas

Industrial and other NPDES Stormwater Permits-DMR data incorporated into prioritization

Ecology-SOPs, Review QAPPs, Plans,

Cost Dependent on the Source/Stressor. Many source removal programs are in place, but

the monitoring, goals, and feedback loop needs to be implemented and in concert with the identified source.

The End