25D - 55 AND ALTON AVE OVERCROSSING

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Task 4.2 Design Surveys Huitt-Zollars will perform ground design topographic surveys including, edge of traveled way surveys, topographic surveys, topographic surveys of areas obscured to aerial photography, existing edge and join condition locations and existing drainage invert surveys. Huitt-Zollars will coordinate with Caltrans to acquire required encroachment permits for survey work on SR-55. The topographic survey work on SR-55 will be done utilizing "reflectorless" total station survey equipment that will eliminate the need for a lane closure, thereby not interfering with the traveling public. Task 4.3 Survey Cross-Sections Huitt-Zollars will complete survey cross-sections, at 50-foot intervals, across Alton Avenue and Alton Parkway and from the edge of travel way to the right-of-way limit on SR-55 within the project limits. Work will include critical features between section stations and sufficient edge conditions for design purposes. Task 4.4 Geotechnical Studies Our geotechnical scope of work is aimed at providing geotechnical information for the design of the proposed roadway and bridge improvements and will consist of field exploration, laboratory testing, geotechnical engineering analyses, and report preparation. Our scope of work does not include subsurface hazardous materials investigations, reports or chemical testing of soil and groundwater. Scope, fee, and schedule can be developed for these tasks if found to be necessary as the project progresses. Task 4.4.1 Field Investigation Our field program will consist of one day of rotary wash drilling (one deep boring up to 80 feet deep for the bridge and shallow borings for pavements) and one day of CPTs (2 CPTs to 80 feet or refusal for the bridge and 4 CPTs up to 40 feet each for walls). Standard Penetration Test, California Ring, and bulk samples of representative soil layers will be obtained at appropriate depth intervals in the borings (typically 5 feet). The Huitt-Zollars Team will prepare a proposed boring location plan for review by the City I Caltrans. The Huitt-Zollars Team is experienced in working with Caltrans and City Public Works Departments in obtaining the necessary permits for the field exploration program. The field program will be carefully planned and coordinated agencies to minimize any impact on the flow of traffic, and to maintain proper safety precautions. Task 4.4.2 Laboratory Testing The Huitt-Zollars Team's laboratory-testing program will be aimed at evaluating the physical, geotechnical, and chemical (corrosion) properties of the site soils. The exact scope of the laboratory program will depend on the soil conditions encountered during our field exploration. However, for planning purposes, we have considered the following types of tests: • In Situ Moisture Content and Density • Grain Size Distribution 1 Percent passing No. 200 sieve • Direct Shear • Consolidation • Atterberg Limits • Soluble Sulfate Content, Chlorides, pH, resistivity • R-Value All reports will be prepared in accordance with the latest Caltrans guidelines. Exploration /Traffic Control Plan /Permit Applications (3): o (1) Caltrans o (1) Santa Ana o (1) Irvine Preliminary Foundation Reports (2): o (1) for bridge structure 25D-55