BP68332/1965; TWO SUBM PILES USED AS ACOUSTIC RANGE HYDROPHONE MOUNTS (4000 YD STATION) FOR TORPEDO RANGE.  PIPES ARE LOCATED AT (NAD83) 47/39/59.29N, 122/36/02.76W.  HYDROPHONE DEPTHS RECORDED AS 73 FT & 75 FT. (LAH 3/17/2010)