legacy/src/main/java/ucar/nc2/dt/StationImpl.java
public void addObs( StationObsDatatype sobs) {
    if (null == obsList) obsList = new ArrayList<StationObsDatatype>();
    obsList.add( sobs);
  }
public void addObs( StationObsDatatype sobs) {
    if (null == obsList) obsList = new ArrayList<StationObsDatatype>();
    obsList.add( sobs);
  }
got to use this or subclass readObservations()