(ATCScript "Constants4DO"
  (Set PerConstituent "PODOXM") 
  (Set ImpConstituent "SODOXM")               (Set PerImpConv "1.0") (Set PerImpUnits "lbs/acre") ('time step specified by HSPF run)
  (Set RchConstituent "DOXOUTTOT")            (Set RchConv    "1.0") (Set RchUnits         "lbs") ('time step specified by HSPF run)
  (Set PtConstituent  (Array "DO2L" "OXF11")) (Set PtConv     "1.0") (Set PtUnits    "lbs/month") (Set PtScenario    "PT-OBS")
                                                                     (Set AreaUnits      "acres")
                                                                     (Set TotalUnits       "lbs")
  (Set HspfAggregation "Sum")
)