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Table 3. Average values of total Kjeldahl nitrogen (TKN) in septic tank effluent obtained
          from the current study and the previous studies (Studies 1985, 1979, and 1970) for
          sites examined

 Site number                       Previous studies            Current study
                  Total Kjeldahl nitrogen (TKN) concentration (gag/mL)
 S-i (Moundt)                           45t164.48
 S-3 (Dosingt)                          115*                       83.91
 S-6 (Conv'lt)                          105T                   Not applicable*
 S-8 (Conv'l)                            51                    Not applicable*
 S-9 (Dosing)                            55t                       66.88
 S-10 (Mound)                           1121                       65.43
 S-12 (Dosing)                           76t                       65.13
 S-13 (Conv'l)                           72t                       100.74
 S-14 (Mound)                            72t                       105.58
 S-15 (Mound)                            52t                       110.21
 3-78 (Mound)                          104.681                     134.20
 WHHSt (Dosing)                         30.981                      52.57

 t WHHS = the Wisconsin Heights High School; Conv'l = conventional system, Dosing =
     conventional system with a pump chamber and dosing system, and Mound = mound-type
     system.
 Values obtained from Study 1985.
 §   Value obtained from Study 1979.
     Value obtained from Study 1970.
 *   Septic tanks no longer accessible.


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