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SFPUC June 10, 2020 Page 4 Applic- Source Value ability San Francisco Bay Regional Water Board's Environmental Screening Levels(Tier 1) 13 [5] [www.waterboards.ca.gov/sanfranciscobay/water issues/programs/esl.htmll mg/kg USEPA's Regional Screening Level for industrial soils—MeHg 12 [7] [www.epa.gov/region9/superfund/prg/] mg/kg DTSC's Screening Level for Commercial/Industrial Soil [dtsc.ca.gov/wp- 4.4 [7] content/uploads/sites/31/2019/04/HHRA-Note-3-2019-04.pdf] mg/kg USEPA's Regional Screening Level for industrial soils—Hg0 4 [7] [www.epa.gov/region9/superfund/prg/] mg/kg APPLICABILITY: [1] Tor hazardous waste classification landfill disposal of solids or liquids,the California Soluble Threshold Limit Concentration (STLC)test is based on a citric acid Wet Extraction Test (WET)for leachability while the federal TCLP test uses acetic acid.Total concentrations cannot equal or exceed TTLC values. If total concentrations equal or exceed 10x STLC, a WET test is required. WET results cannot equal or exceed the STLC values. If either threshold is exceeded in grit pond sediment samples, excavated material could not be received by standard landfills. [2] Maximum contaminant levels (MCLs) regulate treated drinking water quality and are not intended to be applied to untreated source water in local rivers and creeks. In particular, sampling results for total metals—which are readily filterable—should not be compared to standards for dissolved(i.e.,filtered) metals.This enforceable level is based solely on possible health risks and exposure in drinking water, over a lifetime, with an adequate margin of safety.A simple comparison to individual data points does not consider the frequency or duration of exceedances. [3] For tap water. Only to be used for screening purposes. [4] Applicable only to Waters of the US or State. [5] The ESLs are developed and maintained by the San Francisco Bay Regional Board to help expedite the identification and evaluation of a range of potential environmental concerns.They are specifically not intended to serve as: (a) a stand-alone, decision-making tool; (b)guidance for the preparation of baseline environmental risk assessments; (c) a rule to determine if a waste is hazardous under State or federal regulations; or(d) a rule to determine when the release of hazardous chemicals must be reported to the overseeing regulatory agency. [6] For submerged sediments, unlike the ephemeral grit pond. [7] Obtained based on the Toxicity Criteria Rule. Only to be used for screening purposes. UV Lamp Break Events This section describes a typical UV lamp break event at the Tesla Facility and how the discharged water is managed consistent with the current Interception Plan. A schematic of the site features related to managing discharges from a UV lamp break is provided in Figure 1.