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Structures Technical Understanding <br />The existing abutments at the First Street Bridge will move forward to accommodate a three-span <br />structure. The new structure will have ten pre-cast/pre-stressed (PC/PS) Bulb Tee concrete girders, which <br />will be 4'-8" tall, placed on seat type abutments. The new structure is 92 feet wide and 320 feet long with <br />three spans of 100 feet, 120 feet, and 100 feet each. The new structure will have an eight foot sidewalk on <br />both sides with a four foot raised median. <br />Both abutments are constructed on a 2'-6" high, eight foot wide, and approximately 98 feet long spread <br />footing resting on 20 inch pre-cast, pre-stressed concrete piles. These piles are ten straight and ten <br />battered. <br />Piers 2 and 3 are constructed on 2'-6" high, six feet wide and 94 feet long spread footings, which are <br />constructed on 38 piles, each with six battered piles -j <br />on each end. a <br />I <br />Utilities around the foundation area include: <br />• 84" RCP sewer (to be protected in place) N>K a -) ,,? -?: <br />• 16" water main on bridge (to remain in place <br />during Stage 1 construction and relocated - u - - - <br />during Stage 2 construction) <br />• Fiber optics (to be protected in place) <br />• OH electric (to be relocated by others) <br />• 6" sub drain to be removed and relocated <br />• 72" GWRS line (to be'protected in place) <br />• 18" RCP storm drain <br />(to be protected In place) <br />TYP1cAL SECT1oN <br />First Street Bridge Typical Section <br />Retaining Wall and Sound Wall Detail <br />The retaining wall at abutment 1 is a mechanically <br />stabilized earth (MSE) wall approximately 288 feet <br />long, resting on leveling pads. <br />The retaining wall at abutment 4 consists of: <br />• Type 5 SSW, which is constructed on <br />a spread footing. This retaining wall is <br />approximately 72 feet long and requires 2'-6" <br />of over-excavation under the footing. <br />• MSE wails are approximately 398 feet long <br />and rest on a leveling pad. There will be <br />a sound wall constructed on top of this <br />l- t -' a T f? 1 <br />{t{ uau nano . _ <br />P??rEOE a ki4t41C9(? <br />Retaining Wall Cross Section <br />hILt City of Santa Ana I Public Works Agency <br />First Street Bridge Replacement I Construction Management <br />Page 16 <br />25E-41