 HISTORY
  CL240/74--3/4/74, USCG AUX: 6 INCH THICK CONCRETE SLAB EXTENDING 2 FEET OR 2 INCHES (ILLEGIBLE NOTES IN CHART LETTER) ABOVE WATER IN THE POSITION LAT 33-45-53.00N, LONG 118-13-15.00W (NAD 27).  POSITION SHOWN ON ENCLOSED GRAPHIC WAS USED IN L