Next question pertaining to the surveyors if both surveyors are stuck at the western most point and no tiles are put further west of them when a feature is completed do meeples get removed behind the surveyors? If both surveyors are on a column and one moves west do meeples get removed behind the eastern most surveyor?
The answer would be "Yes" to both those questions.
Page 3 of the rules, last paragraph, last line:
A player may place a settler on a just-placed tile in columns "east" of the explorer...as such a settler (not trapper) will be removed immediately after the next scoring!