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From:Jensen, Evan P To:"Kenny, Brendan@Waterboards"; Garrett Backus [EH] Cc:Nelson, Chris; Ritchie, Steve; McAuliffe, Dan F; Ritchie, Steve; MALINA, CATHERINE (CAT); RODDY, JOHN (CAT); ROBINSON, RICHARD (CAT); Cheung, Angela; Ramirez, Tim; Natesan, Ellen; Fedman, Anna; Li, Annie (PUC); Yu, Anthony; Yturralde, Nicole; Guerra, Joe; Cheung, Angela; Sibbring, Justin; Macaulay, Ian; Cordua, Matthew; Sebastiani, Enio; Forner, Ed; Carlevaris, Joseph; Jung, Jowin; Lydia Baker [EH] Subject:Tesla Treatment Facility update February 2018 Date:Tuesday, February 26, 2019 10:15:48 AM Attachments:image001.png Lab results 1_14_2019.pdf Lab Analysis 1.11.2019.pdf Hi Brendan, Garrett, Below is a summary on the on-going situation at the Tesla Treatment Facility (TTF). Continuing from the last update, the TTF has been shut down since 1/8/2019, and will not be operational again until March 11. Due to the lamp breaks in late December, there were two clean- ups in January (1/10 and 1/14). The second clean up became necessary after the lab results from the first clean up showed some residual contamination. CES mobilized on 1/10 and again on 1/14 (after the lab results came back) to perform a trench wash. Attached are the lab reports from January 11th and 14th, with results from the wash water collected in the trench, water pooled in the sump further downstream, and water entering the baker tanks (downstream end of the pump system). Results from the 14th showed the second trench clean-up to be effective in removing remaining mercury residual; the water collected during the scrub down of the trench had a mercury concentration of 0.16 µg/L, and the samples from the sump and the pipe discharge both resulted in non-detect (under 0.05 µg/L). Beginning this Friday, Stantek is installing power meters at a number of locations at the facility. They intend to measure the power quality at TTF to determine whether fluctuating voltage or other parameters being out of range could be a cause for lamp breaks. Data on this will begin coming in once the plant opens up on March 11th. The emergency bypass system is still in place, and will be ready when the system comes back online. Discussions about permitting for on-site water disposal, permanent mitigation design and root cause are ongoing. Thanks, Evan Jensen Evan Jensen, Hydrologist Water Supply and Treatment Division - Water Enterprise San Francisco Public Utilities Commission 1000 El Camino Real Millbrae, CA 94030 Office: (650) 871-1010 Mobile: (520) 304-4814 ejensen@sfwater.org