  H10728/97--OPR-G309-WH-96; OBSTRUCTION FOUND WITH A LEAST DEPTH OF 29 FT IN POSITION 33 52 59.65 N, 078 06 23.11 W (NAD 83). DIVER INVESTIGATION REVEALED CONCRETE PILINGS. HYDROGRAPHER AND EVALUATOR RECOMMENDED "DO NOT CHART; CHART MOST SIGNIFICANT FEA