Nutrient Benchmarks Used in the Appendix Graphs

in the NAWQA Summary Reports, 2004

NAME                                DRW*  EUTROPH**  Report_Units  DRWSRC*  
--------------------------------  ------  -------    ------------  ----------  
Ammonia                               30             MG/L AS N                                     
Dissolved nitrite plus nitrate        10             MG/L AS N     MCL                             
Total phosphorus, as P                        0.1                                                


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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
#
#
#
#       References for human-health benchmarks:
#
#       MCL, ACT, HAL, and RSD5 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/)
#
# ###################################################################
#
#    **  EUTROPH:  Criterion for the prevention of eutrophication
#                  of streams not flowing directly into lakes or
#                  impoundments.
#
# #############################################################################