Example of Mass Balance to Determine Effluent Concentration of Instream Ammonia  
  Season Above Theresa Street WWTP Theresa Street Mixed Conditions below Theresa (IS3) Decay between IS3 and ISD Upstream of Northeast Plant Northeast WWTP Mixed Conditions below Northeast (ISG)    
    (Given) (Given) (meas.) (meas) (calc.) (decay) (decay) (decay) (Given) (Given) (meas.) (meas) (calc)  
    Background
NH3 Conc. (mg/L)
Background
Flow (cfs)
FLOW
(cfs)
NH3 Conc
(mg/L)
Ammonia
(mg/L)
Velocity (fps) Time (days) Decay Constant (K) Background
NH3 Conc. (mg/L)
Background
Flow (cfs)
FLOW (cfs) NH3 Conc
(mg/L)
Ammonia
(mg/L)
 
  Summer 0.09 9.45 31.00 6.50 5.00 0.83 0.42 0.36 1.81 47.36 9.30 21.20 4.99  
  Winter 0.41 18.43 31.00 7.70 4.98 0.91 0.38 0.88 4.37 54.00 9.30 8.60 4.99  
 
     
 
 
 
  K-value 1.5      
 
  winter temp 4.5  
  summer temp 25  
 
  winter k 0.34  
  summer k 2.42