REFERENCES
 

              Metcalf & Eddy, Inc., Wastewater Engineering: Treatment, Disposal, Reuse, McGraw
              Hill, 1991
 
              APHA, AWWA, WPCF, Standard Methods for the Examination of Water and
              Wastewater, APHA, 1989 or later.
 
              Sawyer, McCarty & Parkin, Chemistry for Environmental Engineering, McGraw Hill,
              1994.
 
              AWWA, Water Quality and Treatment, Amer. Wat. Wrks. Assn., 1990