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Ruitt-Zollars prepared platys, specifications, estimates, and the environmental revalidation <br />for the Alton Avenue Widening and Overcrossing at SR -55. The project is constrained In a <br />tight urban environment where right-of-way impacts had to be evaluated on a case-by- <br />case basis. Major Southern California Edison lines paralleled the project area and were <br />included in the utility investigations, The pmject impacted an existing open trapezoidal <br />flood control channel, which was proposed to be relocated and put in a box culvert outside <br />of freeway right-of-way. The Army Corps of Engineers was consulted regarding jurisdiction <br />over this facility. Existing ramps were redesigned to join the widened freeway. The project <br />included: <br />» Development of local street improvements along 1.3 miles of Alton Avenue from Main <br />Street in Santa Ana to Gillette Avenue in Irvine <br />a Freeway widening along t.5 miles of SR -55 from MacArthur Blvd. to Warner Ave <br />» Ramp modifications at MacArthur Boulevard and Dyer [load <br />u A new overcrossing and structure widening <br />n Design of HDV drop ramps and redesign of the ROV lanes an <br />SR -55 <br />Retailed geometric studies, topographic surveys, and final construction documents were prepared <br />by Huitt-Zoilars for this $5 million project to add one through lane in each direction on Oso Parkway, <br />right -turn -only lanes in each direction on Marguerite Parkway, and create double left -turn lanes <br />In all four directions of the existing arterial highway Intersection, Raised medians on all four legs <br />of the intersection were completely reconfigured. Design constraints Included access to existing <br />developments, an adjacent hillside slope buttress, major water pressure reducing station, and <br />other utility vaults and facilities. This project affected 4,600 linear feet of highway, three signalized <br />intersections, and included 1,700 linear feet of retaining walls. Construction pians, specifications, <br />and estimates were prepared for this $5 million project. The work of subconsultants for environmental <br />documentation, traffic engineering, landscape architecture, and cost estimating was coordinated by Huitt-Zoilars. This project involved <br />relocation of numerous electrical, telephone, cable and gas utility facilities, and reinforcement of the underground vault for the pressure <br />reducing station. <br />1 Ill t t La,,IUARS <br />City of Santa Ana Civil Engineering Services: RFP 17-083 12 <br />25E-282 <br />