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Subject: RE: Tesla Treatment Facility update December 2018 Hi Brendan, Garrett, Below is a summary on the trench clean up and interception plan. On 12/20 a lamp break occurred. The sleeve was intact and the reactor was offline. There was no discharge of mercury into the water system. The crew onsite followed the mercury response SOP and removed and replaced the lamp and sleeve. The broken lamp was bagged and tagged and placed in our hazardous waste storage area. On 12/27 another lamp break occurred. Water and mercury were discharged into the trench. Due to reactor panels being removed for repair related to last week's break, the water pressure from the break on reactor 2120 damaged some internal components on 2110. Operations staff did not call OES, because there was no discharge to the environment. Voice messages were left with Regional Board and San Joaquin County OEH representatives that we have been working with on this problem. An incident report will be filed with Cal OES and San Joaquin County CUPA. The majority of the water was pumped to the baker tanks on 12/27 via the emergency system put in place last month. SFPUC and DPW used the same contractor that we used to clean out the trench the first time, CES, to clean out the trench again on 1/10/2019. All wash water was pumped to the baker tanks, and will be hauled out in a vacuum truck by CES on Monday, 1/14/2019. A representative from AEW, Randall Young, verified the trench was clean using an in-situ mercury vapor analyzer. The scheduled shutdown of the plant for routine maintenance of the 144 inch pipes occurred on 1/8/2019, and all flows have ceased at Tesla Portal.The site has undergone LOTO for valves and the UV reactors. The emergency system remains in place should another lamp break occur, but as all the reactors are currently offline, this shouldn't be a problem. Calgon inspected the lamps after the breaks, and encountered a third break that apparently failed during the cool down prior to inspection.The sleeve did not break so no mercury was released (similar to the break on 12/20). In total 12 out of 108 lamps were found with deformations and bulging most likely caused by acoustic resonance. Five (5) reactors had no issues with the lamps. The broken lamps were shipped to Calgon, and given the nature of the deformities they are focusing on acoustic resonance as the root cause. Investigations into the root cause are ongoing. Attached are the waste manifest and lab analysis from the work last month. Thanks, Evan Evan Jensen, Water Resources Engineer Water Supply and Treatment Division - Water Enterprise San Francisco Public Utilities Commission 1000 EI Camino Real Millbrae, CA 94030 Office: (650) 871-1010 Mobile: (520) 304-4814 eiensen(@sfwater.org