1. Copper Source Loading Estimates (Process Profiles) Physical & Chemical Characterization of Wear Debris (Clemson University) Water Quality Monitoring (ACCWP) Steering Committee, Scientific Advisory Team, and Stakeholder Involvement Process (Sustainable Conservation) Air Deposition Modeling (AER) Watershed Modeling (U.S. EPA) Bay Modeling (URS) Final Report Data Assessment Conclusions Air Deposition Monitoring (SFEI) Representative Sample of Brake Pad Wear Debris (BMC/Link Test Labs) BPP Technical Studies

2. Input Data to Air Deposition Model Copper Source Loading Estimates (Process Profiles) Physical & Chemical Characterization of Wear Debris (Clemson University) Air Deposition Modeling Emissions Transport Deposition (wet + dry) Coarse resolution modeling Bay Area monthly resolution background Fine resolution modeling Castro Valley Creek Subwatershed daily resolution (Mar 2004-Feb 2005) local variability Affects wet and dry deposition fluxes Brake and non- brake sources Meteorology data (source: NCDC) Drives simulation of transport and deposition

3. Castro Valley Creek Subwatershed (Fine resolution simulation)

4. Comparison of Simulation Results with Deposition Measurements (SFEI)

5. Interaction with Watershed and Bay Models Provide wet and dry deposition fluxes of copper from brake pad and other air emissions Air Deposition Modeling (AER) Watershed Modeling (U.S. EPA) Long-term Direct deposition fluxes to the bay (regional) Bay Modeling (URS) Daily resolution Impervious vs. pervious surfaces –Much of the Castro Valley Creek Subwatershed is paved –Unpaved area is located higher in altitude and farther from major roads