Human and Ecological Risk Assessment - Earthjustice

Section 3.0AnalysisConstituentHuman Health Benchmarks Used in the CCW Risk Assessment (continued)Type ofBenchmark a Value Units Source bBoron RfD 2.0E-01 mg/kg-d IRISCadmium RfD (water) c 5.0E-04 mg/kg-d IRISRfD (food) d 1.0E-03 mg/kg-d IRISChromium III RfD 1.5E-00 mg/kg-d IRISChromium VI RfD 3.0E-03 mg/kg-d IRISCobalt RfD 3.0E-04 mg/kg-d PPRTVCopper RfD 1.0E-02 mg/kg-d ATSDRCyanide RfD 2.0E-02 mg/kg-d IRISFluoride RfD 6.0E-02 mg/kg-d IRISLead MCL 1.5E-02 mg/L DWALManganese RfD (food) 1.4E-01 mg/kg-d IRISMercury (divalent)RfD (water, soil) 4.7E-02 mg/kg-d IRISRfD (food, water,soil)3.0E-04 mg/kg-d HEASTRfD (fish) 1.0E-04 mg/kg-d IRISMolybdenum RfD 5.0E-03 mg/kg-d IRISNickel RfD 2.0E-02 mg/kg-d IRISNitrate MCL 1.0E+01 mg/L DWALRfD 1.6E+00 mg/kg-d IRISNitrite RfD 1.0E-01 mg/kg-d IRISSelenium RfD 5.0E-03 mg/kg-d IRISSilver RfD 5.0E-03 mg/kg-d IRISStrontium RfD 6.0E-01 mg/kg-d IRISThallium RfD 8.0E-05 mg/kg-d IRISVanadium RfD 7.0E-03 mg/kg-d HEASTZinc RfD 3.0E-01 mg/kg-d IRISa MCL = maximum concentration limitb References:ATSDR: Minimal Risk Levels, ATSDR (2009)DWAL: Drinking Water Action Level, U.S. EPA (2002d)HEAST: U.S. EPA (1997f)IRIS: U.S. EPA (2009a)PPRTV: Provisional peer-reviewed toxicity value (U.S. EPA, 2006a, 2006b, 2008a)c Used for drinking water ingestion.d Used for fish ingestion.Cadmium has two RfDs, one for exposures via water and one for exposures via food. TheRfD for water was used for drinking water ingestion and the RfD for food was used for fishconsumption.April 2010–Draft EPA document. 3-5