DATE: June 12, 2018
SUBJECT:
Title
PRESENTATION ON THE 2017 COPPER LOAD REDUCTION EFFORTS RELATED TO THE SHELTER ISLAND YACHT BASIN TOTAL MAXIMUM DAILY LOAD
Body
EXECUTIVE SUMMARY:
In 2005, the San Diego Regional Water Quality Control Board (Regional Board) set a Dissolved Copper Total Maximum Daily Load (TMDL) for the Shelter Island Yacht Basin (SIYB). The TMDL required a 76 percent reduction of copper loading by 2022, with interim loading targets of 10 percent and 40 percent (compliance phases) by 2012 and 2017, respectively. The TMDL named the District, the City of San Diego, the SIYB marinas and yacht clubs, hull cleaners, and the recreational boaters themselves, as parties responsible for reducing their copper pollution loads. On March 11, 2011, the Regional Board issued Investigative Order No. R9-2011-0036 to the District. The Investigative Order required that the District annually assess TMDL implementation progress and provide written compliance reports (herein referred to as Progress Reports) to document the actions taken to comply with the TMDL.
The 2017 Progress Report marks the final year of the second interim compliance phase, which required a reduction in copper loading by 40%. Not only was the 2017 interim loading target achieved, but it had surpassed the interim requirement. Vessel tracking indicated that there had been an estimated 45.4 percent (approximately 952.7 kg/yr) reduction in copper loading when compared with the TMDL baseline of 2100 kg/yr. Meeting both the first and second interim compliance phases reflects the continued success of efforts related to identifying load reductions from hull paint conversions, Best Management Practices (BMPs), and other activities implemented through the Copper Reduction Program.
Water quality testing showed the basin average to be 7.9 ?g/L, an approximately 5 percent decrease from the baseline average of 8.3 ?g/L. Among other things, it also concluded that the basin water quality has been relat...
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