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1+; DMJM HARRIS AECOM Bridge Structural Design Services The following exploration program has been developed for this project: Design Approximate D. 1 Retaining Walls 3 60 Bridge "Abutments" 2 90 Area Bridge Piers (inside 2 75 the river) The above exploration program will be summarized on a Boring Location Map and this map will be used to process for encroachment permits. Permits will be secured from the City of Santa Ana, Orange County Flood Control, Orange County Health Services (OCHS) and Corps. Atruck-mounted hollow -stem auger drilling rig will be used to perform the field exploration. Traffic control will be required for soil borings on First Street. After logging and sampling are completed, the spoils from the boreholes will be stored inside 55 -gallon drums, tested and removal from the site by a certified hauler. The OCHS will require that boreholes be trended with cement grout which add time (and cost) to the drilling operation. Bulk samples of near -surface soils will be collected for R -value and maximum density tests. Generally, a split -spoon sampler will be used at an interval of 5 feet, alternating between a California Drive sampler and a Standard Penetration Test (SPT) sampler, to collect relatively undisturbed and disturbed samples for additional soil laboratory testing. • Results obtained from the field investigation and laboratory testing program will be used to establish idealized soil profiles and design strength parameters for bridge and wall foundation design. Flexible composite or rigid pavement structural sections will be designed based on R -values obtained from the laboratory tests and Traffic Indices provided by you, using either the Caltrans or Orange County Highway Design Manual method. • One report will be prepared for the entire project. This report will present results of field investigation and laboratory testing, engineering analyses and recommendations for pavement design, and bridge and wall foundations. 2.3 Design Development - DMJM Harris will develop the preliminary alignments which will evaluate potential functional improvements or cost savings. These documents will be submitted for the City's approval to move into the final design phase: These efforts include: 2.3.1 Geometric Approval Drawings: Horizontal alignments will be established for First Street, and will evaluate the walls, slopes, and access road alignments. Any right-of-way requirements will be reflected on these drawings. 2.3.2 Landscaping Development: A landscape re- establishment strategy will be prepared to address the affected landscaping along the river trail as well as the graded slopes along First Street. This strategy will reflect the restoration of the existing landscape as well as provide a conceptual strategy for the restoration of the irrigation system. 2.3.3 Construction Staging: Alternatives will be generated for the maintenance of vehicular traffic, ingress/egress to all adjacent parcels, and to minimize impact to the adjacent residents. 2.3.4 Hydraulics: The hydraulic model from the Corps of Engineers (to be provided by the County) will be revised to match the proposed bridge configuration to determine the impact to the water surface profile. Scour analysis will not be required as the Santa Ana River is concrete lined at this location. 2.3.5 Bridge Type Selection: DMJM Harris intends to take a proactive approach to the Type Selection process as it sets the direction of the project and define the final design. Structure type and foundation alternatives will be considered to come up with a cost effective bridge type selection. A preliminary seismic analysis of the portion of the existing structure which will remain to evaluate its seismic performance in conjunction with the new structure will be also completed. DMJM Harris will attend a meeting with City staff to present its recommendations regarding structure type and seismic evaluation of the existing structure portion which is to remain in place. This meeting should just be a pro forma exercise since DMJM Harris team will keep the City's Project Manager informed and will solicit comments throughout the preliminary design process. Draft "General Plan and Foundation Plan" drawings and other supporting information for the preferred alternative will be submitted with a Draft Type Selection Report five (5) working days prior to the meeting for review. DMJM Harris will resolve any comments arising from the Type Selection Meeting and revise the Type Selection report accordingly. Our planned deliverable at this stage will be five (5) copies of the Type Selection Report with General Plan and Estimate. 2.3.6 Preliminary Cost Estimates: A rough order of magnitude construction cost estimate will be prepared for the refined alternative. Task 3 — PS&E Preparation The project plans will be developed in Microstation, with all supporting documentation prepared in the Microsoft Office Suite of products. The standard City border will be utilized on the plan set. As the project plan set will be significant in size, DMJM Harris will prepare the project plans in a manner that is legible and can be reviewed at half -scale on 11x17 material. The requisite reduced and full-size sets as identified in the RFP will be made at the 60%, 90%, 100% and final submittal milestones. 3.1 General Sheets — The title sheet will depict the project title, location and vicinity maps, signature blocks, and benchmark. With the volume of information in the plan set, 04601 324.5157 13