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0 MCCORD <br /> ENVIRONMENTAL <br /> To: Jowin Jung, San Francisco Public Stephen McCord, Ph.D., P.E. <br /> Utilities Commission 759 Bianco Court <br /> Davis, CA 95616 ��e�°�essrD�yA. We <br /> Cc: Bruce Abelli-Amen, Baseline (530) 220-3165 <br /> sam@mccenv.com 5816Environmental Consulting 5 <br /> t Gx� z <br /> Evan Jensen, SF Water s�9jE��c�L��`�`r <br /> Reviewed by: <br /> Date: June 10, 2020 Bruce Abelli-Amen <br /> Baseline Environmental <br /> Subject: Tesla Facility mercury controls Consulting <br /> bruce@baseline-env.com <br /> Overview <br /> In June 2018, the City of San Francisco Public Utilities Commission (SFPUC) received a Notice <br /> of Violation from the Central Valley Regional Water Quality Control Board(Regional Board) <br /> that stipulated specific requirements to address the discharge of drinking water with trace levels <br /> of mercury from the Tesla Water Treatment Facility (Tesla Facility). The Tesla Facility is at <br /> 9000 West Vernalis Road, Tracy California, about 7.5 miles south of the City of Tracy, in <br /> unincorporated southwestern San Joaquin County. Ultraviolet(UV) lamps containing mercury <br /> (Hg) occasionally (i.e., seven times in years 2018-2019) break within SFPUC's water <br /> transmission pipelines. When this occurs, water from the reactor section of pipe bursts out of the <br /> UV reactor cover onto the building floor(which then flows into a trench drain) for several <br /> minutes until the UV reactor's isolation valves can be fully shut. Mercury levels in various <br /> compartments are monitored and managed by SFPUC staff through various procedures. <br /> This memorandum supports SFPUC in addressing the potential environmental contamination <br /> concerns associated with the discharge, as well as the regulatory concerns—from both the San <br /> Joaquin County Environmental Health Department and the Regional Board. <br /> Personnel <br /> The individual responsible for the work described herein is Stephen McCord, President at <br /> McCord Environmental, Inc. Dr. McCord is a Registered Professional Engineer in California <br /> who serves clients throughout California and internationally in water quality management issues. <br /> A particular area of focus over the past 20 years has been mercury—developing conceptual <br /> models, mass balance models, and strategic plans; monitoring and assessing monitoring results; <br /> facilitating large stakeholder groups; evaluating regulatory control and trading programs; and <br />