EA 49'-6" LF OF 11'-9" SPAN X 7'-2" RISE, 0.150" METAL THKALSP PIPE ARCH WITH HEADWALL STUB PIPES 6'-9" CENTERLINE LENGTH TO BE 0.200" METAL THICKNESS WITH TYPE II RIBS ON 9" CENTERS. FULLY WELDED ON A 30 DEGREE SKEW ANGLE TO 38’-3” WIDE X 14’-0” HIGH, 0.250 METAL THICKNESS, ALUMINUM STRUCTURAL PLATE HEADWALL ON INLET AND OUTLET ENDS, TWO(2) EA -1’ HIGH ALUMINUM SILLS REINFORCED AND FULLY WELDED INSIDE PIPE ARCH PER ATTACHED DRAWINGS. LRFD HL 93 LOADING MINIMUM COVER=2.5’ MAXIMUM COVER=13 OPEN HYDRAULIC AREA OF PIPE ARCH=67.5 SQ. FT. PROPOSED ELEVATIONS RD= 2096.36 INLET TOP OF WALL• 2092.90 EP= 2095.99 PIPE INV• 2079.90 BOTTOM WALL• 2078.80 OUTLET TOP OF WALL• 2092.55 EP= 2096.23 PIPE INV• 2079.55 BOTTOM WALL= 2076.55
