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Selecting Numerical Limits - <br /> _ 6 _ 20 August 2002 <br /> ■ OEHHA Public Health Goal <br /> ■ Cal/EPA cancer potency factor at the one-in-a-million risk level 14 <br /> ■ California Drinking Water Action Level based on toxicity <br /> ■ USEPA IRIS criteria;select the lowest of <br /> • one-in-a-million cancer risk estimate <br /> • reference dose for non-cancer toxicity <br /> ■ USEPA Health Advisory; select the lowest of <br /> • one-in-a-million cancer risk estimate <br /> • lifetime non-cancer limit <br /> ■ USEPA MCL Goals (non-zero values only") <br /> ■ Other health-risk based limits (check dates and basis before using these) <br /> • National Academy of Sciences criteria; select the lowest of <br /> ♦ one-in-a-million cancer risk estimate <br /> ♦ drinking water health advisory <br /> • Proposition 65 levels (f no other health risk-based limits are available) <br /> ➢ Human health-risk based limits that include fish consumption exposure <br /> (applies only if there are no CTR or NTR criteria for human health protection) <br /> ■ USEPA Recommended Ambient Water Quality Criteria (RAWQC) for human <br /> health protection (Use criteria for drinking water sources, consumption of water <br /> plus aquatic organisms, unless the MUN beneficial use has specifically been de- <br /> listed for the water body. If based on cancer risk, check that current cancer risk <br /> factors are used) <br /> ➢ Aquatic life protective limits, normally in the following hierarchy <br /> (applies only if there are no CTR or NTR criteria for aquatic life protection) <br /> ■ California Department of Fish and Game hazard evaluation or water quality <br /> criteria[If available, both the Criteria Continuous Concentration (CCC, normally <br /> 4-day average) and Criteria Maximum Concentration (CMC, normally 1-hour <br /> average) criteria apply. Sampling frequency should allow determination that <br /> both types of criteria are satisfied] <br /> ■ USEPA Recommended Ambient Water Quality Criteria(RAWQC)for aquatic life <br /> protection[If available, both the Criteria Continuous Concentration (CCC, 4-day <br /> average or 24-hour average) and Criteria Maximum Concentration (CMC, <br /> 1-hour average or instantaneous maximum) criteria apply. Sampling frequency <br /> should allow determination that both types of criteria are satisfied.] <br /> 14 See footnote 11, above. <br /> 15 See footnote 12,above. <br />