WATER QUALITY VERTICAL PROFILE
                   QUALITY ASSURANCE CODES


      Occasionally, an individual probe failed to operate
      properly while the vertical profile was being taken.  If
      this happened, the measurements that would have been
      taken for that probe at that station were not recorded.  
      In the data file, these measurements are represented by a
      missing value and a QA code as follows:

            P-A  = Profile acceptable
            PH-X = pH not measured due to instrument failure
            PL-X = neither pH nor light measured due to 
                     instrument failure
            PS-X = neither pH nor salinity measured due to
                     instrument failure
            LT-X = light not measured due to instrument failure