A surveyor has completed a loop traverse from a control station

which has state plane coordinates. In computing state plane coordinates

since the traverse was small in size and the area was flat he used

one scale factor and one elevation factor. He obtained a magnetic

bearing for the beginning traverse line and used the magnetic

declination to compute a geodetic direction, which he used for

his basis of bearings. You are required to survey an adjacent parcel

and tie both to his work and other existing control. What is the

surveyor's biggest mistake, and how would you help him correct it$.$