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Huitt-Zollars prepared plans, specifications, estimates, and the environmental revalidation for the Alton Avenue Widening and Overcrossing at SR -55. The project is constrained in a tight urban environment where right-of-way Impacts had to be evaluated on a case-by- case basis. Major Southern California Edison lines paralleled the project area and were included in the utility investigations. The project impacted an existing open trapezoidal flood control channel, which was proposed to be relocated and put in a box culvert outside of freeway right-of-way. The Army Corps of Engineers was consulted regarding jurisdiction over this facility, Existing ramps were redesigned to join the widened freeway, The project Included; » Development of local street Improvements along 1.3 miles of Alton Avenue from Main Street in Santa Ana to Gillette Avenue in Irvine » Freeway widening along 1.5 miles of SR -55 from MacArthur Blvd, to Warner Ave » Ramp modifications at MacArthur Boulevard and Dyer Road » A new overcrossing and structure widening » Design of NOV drop ramps and redesign of the NOV lanes on SR -55 RELEVANT DESIGN COMPONENETS PS&E Ro6dwaya and Bridge + dvercrossing • G�adfngendQaving • Enviommental Landscape Detailed geometric studies, topographic surveys, and final construction documents were prepared by Huitt-Zollars for this $5 million project to add one through lane in each direction on Oso Parkway, right -turn -only lanes in each direction on Marguerite Parkway, and create double lett-tum lanes in all four directions of the existing arterial highway intersection. Raised medians on all four legs of the intersection were completely reconfigured. Design constraints Included access to existing developments, an adjacent hillside slope buttress, major water pressure reducing station, and other utility vaults and facilities. This project affected 4,600 linear feet of highway, three signalized intersections, and included 1,700 linear feet of retaining walls. Construction plans, specifications, and estimates were prepared for this $5 million project. The work of subconsultants for environmental documentation, traffic engineering, landscape architecture, and cost estimating was coordinated by Huitt-Zollars. This project involved relocation of numerous electrical, telephone, cable and gas utility facilities, and reinforcement of the underground vault for the pressure reducing station. L� a RELEVANT RESIGN COMPONENETS: + Road Widening • Traffic Signals • Signage & striping • Retaining Walls • Pavement Rehabilitation & Overlay • Trak Contml/Construction Phasing • Right -of -Way • Storm Drain • Design, Geometries & PS&E • Private ProperlyAccess Modifications City of Santa Ana Civil Engineering Services: RFP 17-083 12