  H9255WD/71,72--OPR-467-RH-71,72; ITEM 33; 1:20,000 SCALE SURVEY; RAYDIST      
CONTROL (HYPERBOLIC, R/R) AND VISUAL. TRACTOR TREAD EXTENDING 1FT OFF BOTTOM.
HUNG AT 15FT; CLEARED BY 12FT. DEPTHS IN AREA FROM H9910/80 ARE 17-18FT;     
RECOMMENDED CH