The 60 ft. reference came from Sheriff Beary shortly after her body was found.
This fact makes it all the more unlikely that the meter reader actually visually spotted the bag while relieving himself. Seems highly unlikely that he would fight his way through thick plants anywhere near enough to spot a bag on the ground that was also partially covered by brush.
Or the body was alot closer to the road. Or he was just doing what he was tipped to do. My money is on the latter.