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San Francisco Water Supply&Treatment Divfslon <br /> �/►� 1000 El Camino Real <br /> Water �����'B S e Y d e r Millbrae, CA 94030 <br /> T (650)872-5900 <br /> Operator of the Hetch Hetchy Regional Water System F (650)872-5984 <br /> July 9, 2018 <br /> Mr. Brendan Kenny, Engineering Geologist <br /> Central Valley Regional Water Quality Control Board <br /> 11020 Sun Center Drive #200 <br /> Rancho Cordova, CA 95670 <br /> NOTICE OF VIOLATION FOR TESLA TREATMENT FACILITY, SAN FRANCISCO <br /> PUBLIC UTILITIES COMMISSION, SAN JOAQUIN COUNTY <br /> Dear Mr. Kenny: <br /> Thank you for discussing with me on July 6, 2018, the Central Valley Regional Water <br /> Quality Control Board's (Water Board) Notice of Violation and Section 13260 Order <br /> dated June 27, 2018, regarding the discharge of waste associated with ultraviolet (UV) <br /> light treatment of drinking water at San Francisco Public Utilities Commission's (SFPUC) <br /> Tesla Treatment Facility. I appreciate your comments and cooperation, and assure you <br /> that SFPUC is dedicating substantial efforts to develop solutions for this important <br /> facility. <br /> The Tesla Treatment Facility provides primary and secondary disinfection of Hetch <br /> Hetchy Reservoir water before it enters the Bay Area and is delivered to water <br /> customers. To serve potable water to 23 million Bay Area customers, SFPUC must <br /> maintain compliance with Safe Drinking Water Act requirements for secondary <br /> disinfection of the water by continuously operating the UV treatment process. <br /> Discharges from the facility can occur as the result of UV treatment equipment. The <br /> Tesla Treatment Facility UV treatment process equipment includes 12 reactors like the Mark Farrell <br /> one shown by the attached Figure 1, in which can be seen the round, black endcap of a <br /> ]he Kwon <br /> reactor with white lettering, reading, "Sentinel." In this figure, below the reactor can be ires<<I nt <br /> seen grating, which is the cover of a trench drain. Figure 2 is a close-up photograph of Vince Courtney <br /> the reactor with the endcap removed so that 9 round UV bulb receptacles are visible. vi`C.Pw�ident <br /> Each receptacle allows insertion of a quartz sleeve, which houses a single UV lamp, Ann Moller Caen <br /> Commissioner <br /> preventing water contact with the bulb. <br /> Francesco Viato; <br /> Cmmmisioner <br /> Figure 3 depicts the alignment of the trench drain, which extends the full distance of the Anson Moran <br /> reactor building and conducts any water released by lamp failures by gravity out of the commissioner <br /> Harlan L.Kelly,Jr. <br /> General Ma»arger <br /> Services of the San Francisco Public Utilities Commission <br /> OUR MISSION:To provide our customers with high-quality,efficient and reliable water,power and sewer <br /> services in a manner that values environmental and community interests and sustains the resources entrusted <br /> to our care. `''� <br />