Trace Elements in water Benchmarks Used in the Appendix Graphs

in the NAWQA Summary Reports, 2004

NAME                DRW*   Report_Units  DRWSRC*  
----------------  ------   ------------  ----------  
Antimony               6   UG/L AS SB    HAL        
Arsenic               10   UG/L AS AS    MCL       
Beryllium              4   UG/L AS BE    MCL      
Lead                  15   UG/L AS PB    ACT     
Molybdenum            40   UG/L AS MO    HAL    
Radon-222            300   PCI/L         MCL   
Selenium              50   UG/L AS SE    MCL  
Silver               100   UG/L AS AG    HAL 
Thallium               2   UG/L AS TL    MCL    
Uranium               30   UG/L  AS U    MCL   



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#
#    *  DRW:  Drinking Water Criteria:
#
#    *  DRWSRC Source Codes:   Source of data in the  DRW column:
#
#       MCL = EPA maximum contaminant level in drinking water
#
#       ACT = EPA action level in drinking water
#
#       HAL = EPA lifetime health advisory, assumes consumption of 2 L of
#       water per day over a 70 year lifetime by a 70-kg adult, and that
#       20% of exposure comes from drinking water
#
#
#
#
#       References for human-health benchmarks:
#
#       MCL, ACT, and HAL values are from USEPA (2002c) unless
#       noted otherwise.  
#
#
#       USEPA, 2002c, 2002Edition of the drinking water standards and
#       health advisories, Office of Water, EPA-822-R-02-038
#       (http://www.epa.gov/waterscience/drinking/standards/)

# #############################################################################