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Huitt-Zollars prepared plans, 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 fines paralleled the project area and were <br />Included In the utility investigations. The project 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 />» Freeway widening along 1.5 miles of SR -55 from MacArthur Blvd. to Warner Ave <br />» Ramp modifications at MacArthur Boulevard and Dyer Road <br />» A new overcrossing and structure widening <br />» Design of NOV drop ramps and redesign of the NOV lanes on <br />SR -55 <br />z 1 5 i Detailed geometric studies, topographic surveys, and final construction documents were prepared <br />r,1 by Huitt-Zollars 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 Marguarite Parkway, and create double left -turn lanes <br />In all four directions of the existing arterial highway intersectior. 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 plans, specifications, <br />and estimates were prepared forthis $5 million project, The work of subconsultants for environmental <br />documentation, traffic engineering, landscape architecture, and cost estimating was coordinated by Ruitt-Zoltars. 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 />HUITEZOLCARS <br />RELEVANT <br />DESIGN: <br />GOMPONENETS: <br />• Road'Widemng . <br />• r Right of Way <br />• �ralTc sI!.004 <br />'' Stoiig'rain <br />• SrgWo &,,Striping <br />• '&sign, Ceomatrics & PUE <br />• Reta�pjn�Walls <br />• ;Pr'rvatePropertyAccess <br />• fiavd ji&hi-ReF dbllliatron & Overlay <br />Modfircations <br />• draycControl/Construction, Phasing <br />City of Santa Ana Civil Engineering Services: RFP 17-083 12 <br />25E-236 <br />