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

Home Browse Search

SCOPE OF SERVICES CITY OFSANTAANA „ SANTA ANA BOULEVARD GRADE SEPARATION s HARK THOHAS Consultant shall prepare and submit a geotechnical Number of approximate review and exploration plan for the City to review. Design Element Borings Depth (feet) Consultant shall obtain right-of-entry permits prior to exploration. Geotechnical borings within the Rail Bridge and 2 125 railroad ROW or adjacent with the potential to foul Pedestrian Bridge 2 175 the tracks will require SCRRA review with right of entry permit, training, and flagging. To reduce the Retaining Walls 3 30 - �o delay in permitting and flagging time, borings will Roadway 3 5 - 10 be placed outside of the railroad ROW. Improvements Consultant shall conduct subsurface investigation Shoofly Track 2 10 per AASHTO requirement and evaluate the results Design in accordance with specified testing criteria. AASHTO requires a soil boring at each bridge support location where substructure width is less A qualified geotechnical engineer shall prepare a than 100 feet; minimum of two borings are required Geotechnical Report for foundation design of the per location where substructure width is greater bridges, retaining walls, pump station, and than 100 feet. Since the bridge substructure width, roadway pavement and embankment. Sufficient measured from one edge of the pedestrian bridge borings and material samples shall be taken to to the other edge of the railroad bridge, is less than determine the road structural section and slope 100 feet, one set of borings is sufficient for both stability. Consultant shall propose a Traffic Index bridges. (TI) for the all lanes and obtain City concurrence. It For retaining walls, a soil boring is required every shall be the responsibility of the Consultant to notify Underground Service Alert and provide 100 to 200 feet. For pavement, a boring shall be traffic control. Consultant shall tie position of performed every 500 to 750 feet. Based on this boring locations, with elevation. information, consultant's geotechnical field investigations plan is presented in the table below. The Foundation Report shall also include: The proposed approximate boring depths will be 0 Nature of materials found on the site. raised if refusal is encountered. The boreholes will • Liquefaction potential. be excavated using a truck-mounted or track- Any geological hazards that may exist and mounted drilling rig. Asphalt concrete cold-patch will be used to replace asphalt that is removed by recommend mitigation measures. Seismic design data in accordance with excavations. Consultant shall analyze the results and present them in the geotechnical report. The Caltrans 1 AREMA seismic design criteria. geotechnical report shall be prepared to include It shall be assured that the design parameters and recommendations for design and construction of potential construction difficulties are identified and bridge foundations, earth retaining structures, cut addressed, together with the proper mitigation and fill slopes, pavement, and drainage facilities measures in the Geotechnical Report. For the Results obtained from the field and laboratory bridge structure, alternative types of foundations testing shall be used to establish an idealized soil shall be evaluated to insure the selection of the profile and strength parameters for bridge and most suitable type of foundation. A log of Test retaining wall foundation design, and slope stability Borings sheet shall be prepared and included as and settlement calculations for the approaches. Part of the report and as part of the structure plans. Consultant shall provide information on This Log of Test Borings sheet shall be prepared in remediation measures if the site soils are corrosive accordance with Caltrans Standard Procedures. to concrete or steel structures. R-value shall be Laboratory Testing - Bulk and disturbed 1 used to determine composite pavement structural undisturbed samples shall be selected for sections using Traffic Indices. laboratory testing. All tests shall be