By default, the grid report is created every time a new grid is created.  To turn on or off the creation of the gridding report, use the ShowReport property of the GridData method. The snippet below shows how to turn off the grid report.

SurferApp.GridData(DataFile:=savedDATfile, xCol:=2, yCol:=3, zCol:=DATACOL, _
Algorithm:=1, ShowReport:=False, OutGrid:=SaveDirectory+OutputFileName+".grd"