Copper Site Specific Objective 3-year Rolling Averages
As part of the copper site-specific objective, NPDES dischargers are required to calculate annually the three-year rolling average of dissolved copper concentrations in water in each segment of the Bay, based on RMP data.a This table presents the segment average and corresponding trigger levels in the Basin Plan. The average includes data from randomized as well as historical sites in the segments, although it excludes data from the historical reference site outside the Golden Gate.
Bay Segment | Trigger (μg/L) | 2015-2019 Rolling Average (μg/L) | Number of Samples Included in Average | Notes |
---|---|---|---|---|
Lower South Bay | 4.2 | 2.68 | 15 | |
South Bay | 3.6 | 1.96 | 12 | Historical Station BA30 included |
Central Bay | 2.2 | 1.25 | 11 | Historical Station BC10 included |
San Pablo Bay | 3.0 | 1.7 | 9 | |
Suisun Bay | 2.8 | 1.85 | 9 |
Sample Locations
- 2009 Copper Sample Locations Map
- 2010 Copper Sample Locations Map
- 2011 Copper Sample Locations Map
- 2013 Copper Sample Locations Map
- 2015 Copper Sample Locations Map
- 2017 Copper Sample Locations Map
- 2019 Copper Sample Locations Map
a In 2011, the RMP reduced the frequency of water and sediment sampling to biennial. Water samples are now collected during odd-numbered years. Therefore, the current copper 3-year rolling averages include 2015, 2017, and 2019 data.
Key Materials
2019 Update to Copper Rolling Average - Presentation
Past Results:
Bay Segment | Trigger (μg/L) | 2013-2017 Rolling Average (μg/L) | Number of Samples Included in Average | Notes |
---|---|---|---|---|
Lower South Bay | 4.2 | 3.04 | 15 | |
South Bay | 3.6 | 2.37 | 12 | Historical Station BA30 included |
Central Bay | 2.2 | 1.46 | 12 | Historical Station BC10 included |
San Pablo Bay | 3 | 1.81 | 9 | |
Suisun Bay | 2.8 | 2.10 | 9 |