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Structures Technical Understanding The existing abutments at the First Street Bridge will move forward to accommodate a three -span structure. The new structure will have ten pre- cast /pre - stressed (PC /PS) Bulb Tee concrete girders, which will be 4' -8" tall, placed on seat type abutments. The new structure is 92 feet wide and 320 feet long with three spans of 100 feet, 120 feet, and 100 feet each. The new structure will have an eight foot sidewalk on both sides with a four foot raised median. Both abutments are constructed on a 2' -6" high, eight foot wide, and approximately 98 feet long spread footing resting on 20 inch pre -cast, pre - stressed concrete piles. These piles are ten straight and ten battered. Piers 2 and 3 are constructed on 2' -6" high, six feet wide and 94 feet long spread footings, which are constructed on 38 piles, each with six battered piles on each end. ;a Utilities around the foundation area include: • 84" RCP sewer (to be protected in place) • 16" water main on bridge (to remain in place during Stage 1 construction and relocated during Stage 2 construction) • Fiber optics (to be protected in place) • OH electric (to be relocated by others) • 6" sub drain to be removed and relocated • 72" GWRS line (to be'protected in place) • 18" RCP storm drain (to be protected In place) Retaining Wall and Sound Wall Detail The retaining wall at abutment 1 is a mechanically stabilized earth (MSE) wall approximately 288 feet long, resting on leveling pads. The retaining wall at abutment 4 consists of: • Type 5 SSW, which is constructed on a spread footing. This retaining wall is approximately 72 feet long and requires 2' -6" of over - excavation under the footing. • MSE wails are approximately 398 feet long and rest on a leveling pad. There will be a sound wall constructed on top of this TYP1cAL SECT1oN First Street Bridge Typical Section nrnvs- r��• *K. M loll i Retaining Wall Cross Section 1"Itt City of Santa Ana I Public Works Agency First Street Bridge Replacement I Construction Management 25E -41 Page 16