
 SURVEY REQUIREMENT COMMENTS
  IF NOT VISIBLE, CONDUCT A BOTTOM DRAG FOR 50 METERS WIDTH IN ì
NE-SW DIRECTION ALONG CENTERLINE OF PILES IN A ROW.

 HISTORY
  CL1178/58--COE, 7 PILES THAT MARK EDGE OF DREDGED CHANNEL ì
POSITION SCALED FROM CHART 113