MARK THOMAS & COMPANY, INC. (6) - Laserfiche WebLink

Home Browse Search

SCOPE OF SERVICES designer and checker will be reconciled for plan updates in the following submittal. 8.3 Pedestrian Bridge 8.3.1 Type Selection Mark Thomas will prepare a Structure Type Selection Report to assist the City in determining the best suited structure type for the project. The Type Selection Report will discuss geotechnical, hydraulic, seismic, constructability, aesthetic, utility, and drainage issues related to the structure A final proposed alternative will be recommended in the report, which will include a General Plan, Foundation Plan, and General Plan Estimate for the recommended alternative. 8.3.2 Plan Preparation Mark Thomas will prepare structural calculations and plans for the recommended bridge alternative. For the purposes of this scope of work, it is assumed that a two -span, cast -in -place, post - tensioned box girder is the preferred structure alternative. The structure design will be in accordance with AASHTO LRFD Guide Specification for the Design of Pedestrian Bridges, 2nd Edition with the California Amendments and Caltrans Seismic Design Criteria, Version 2.1. The 2025 Caltrans Standards and current versions of the Caltrans Structure Technical Policies and Bridge Design Manuals will be used. It is assumed that the following plan sheets will be prepared: • General Plan (1) • Index to Plans (1) • Deck Contours (1) • Foundation Plan (1) • Abutment Layout (2) • Abutment Details (3) • Bent Layout (1) • Bent Details (3) • Typical Section (1) • Girder Layout (1) • Girder Details (2) • Railing Details (1) • Joint Details (1) • Miscellaneous Details (1) • Log of Test Borings (3) • Total Sheets: 23 CITY OF SANTA ANA „ SANTA ANA BOULEVARD GRADE SEPARATION HARKTHOHAS 8.3.3 Independent Check Mark Thomas will perform an independent design check of the pedestrian bridge in conformance with Caltrans bridge design procedures. The independent check will be completed by an engineer who was not involved in the original design of the structure. Calculations will be performed to check the bridge layouts and structural integrity. Upon completion of the independent check, discrepancies between the designer and checker will be reconciled and plans updated. 8.4 Retaining Walls 8.4.1 Plan Preparation Mark Thomas will prepare structural calculations and plans for the retaining walls, including staircase details between retaining walls adjacent to northwest corner of the Pedestrian Overcrossing, with the proposed wall type for each location. For the purposes of this scope of work, it is assumed that combination of soldier pile walls andfor secant pile walls (top down construction method) and a Cast -In -Place (CIP) gravity cantilever concrete retaining walls (bottom up construction method) will be utilized for the 6 wall locations. The structure design will be in accordance with AASHTO LRFD Bridge Design Specifications, 8th Edition with the California Amendments and SCRRA standards and design manuals. The 2025 Caltrans Standards and current versions of the Caltrans Structure Technical Policies and Bridge Design Manuals will be used. It is assumed that the following plan sheets will be prepared: Retaining Walls Sheet Description • General Plan (1) • Index to Plans (1) • General Notes (1) • Construction Details (1) • Structure Plan (9) • Wall Details (8) • Drainage Layout (2) • Drainage Details (2) • Railing Details (2) • Aesthetic Details (1) • Miscellaneous Details (2)