  H10224/86--OPR-C121-WH-86; AN OBSTRUCTION, A LARGE CONCRETE BLOCK, ì
7FT LONG, 7FT WIDE AND 4 FT TALL; SURROUNDING AREA FOUND TO ì
CONSIST OF SMALL ROCKS, 6-12 INCHES, ON A SAND AND SILT BOTTOM; ì
A PNEUMATIC DEPTH GAUGE LEAST DEPTH OF 59 FT, WAS LO