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F7 401N Subject: Mercury Lamp Break, Tesla Treatment Facility UVR 2030, December 2016 02/23/2017 Lid j 2017 Background ENIVIR0,,1j,:-�,j- HEALTH On Wednesday, 12/07/16, at 1:06 PM, one lamp within UV Reactor 2030 (UVR 2030) ruptured during routine calibration activities, resulting in a discharge of water from the reactor to the floor and trench drain. The incident report is included as Attachment A. The location of UVR 2030 is shown on the site plan included as Attachment B. Each lamp contains 2.3 grams (g) of mercury and is contained within a quartz sleeve, which is vaporized during operation. During the incident on 12/07/16, both the lamp and quartz sleeve were damaged; however discharge to the surrounding floor and trench was limited as the reactor covers did not disengage. A small amount of water was spilled on to the floor through a weep hole at the bottom of the access panel on the west side of the reactor. The discharged water was presumed to contain mercury. Site personnel did not come into direct contact with the water released from the reactor. Spill Response, Cleanup, and Waste Disposal Spill response activities were conducted by SFPUC personnel in accordance with the Mercury Release Response Plan (SFPUC, 2013) and Section 1— Safety of the Sentinel TM UV Disinfection System Operations and Maintenance (O&M) Manual (Calgon Corporation, 2012). Mercury lamp breakage response actions at the Tesla Treatment Facility (TTF) are categorized based on (1) Lamp Breakage Outside of the UV reactor; (2) Lamp Breakage Inside of the Reactor, but Contained within the Quartz Sleeve; and (3) Lamp Breakage Inside of the Reactor, but NOT Contained within the Quartz. Sleeve. Based on an evaluation of potential mercury releases as a result of lamp breakage (Stantec, 2010), breakage of three or more mercury lamps during a single incident also requires implementation of the blow off procedure at the downstream mercury trap to protect the drinking water supply and keep mercury levels at the nearest downstream consumer (Lawrence Livermore National Laboratory [LLNL] Site 300) below the maximum contaminant level (MCL) of 2 µg/L. Response activities for UVR 2030 followed the procedure for Lamp Breakage Inside of the Reactor, but NOT Contained within the Quartz Sleeve (Section 5.3 of the Mercury Release Response Plan). In accordance with the Mercury Release Response Plan (SFPUC, 2013), the area was immediately evacuated to prevent potential exposure of site personnel to mercury vapor. The inlet valve and flow control valve to UVR 2030 were closed and lack-out/tag-out procedures were followed. The area was secured pending the results of air monitoring in the work zones, and other site personnel were notified. At 2:45 PM personnel trained in hazardous materials handling and the Mercury Release Response Plan procedures donned personal protective equipment (PPE) and conducted mercury vapor monitoring using a Jerome 431X mercury vapor analyzer. Mercury vapor levels were measured in the reactor building near UVR 2030; mercury levels surrounding the reactor were not detected. In addition, the spill area was visually assessed for the presence of mercury using a flashlight held at a 45 -degree angle to detect small mercury droplets. No mercury was detected. Site personnel then drained the reactor through the drain valve into the trench drain below the reactor. The reactor has a total capacity of approximately 4,000 gallons of water. Discharged water then drains