Retaining Walls and Miscellaneous Structures. The Engineer shall develop each retaining wall design and determine the location of each soil boring needed for the foundation design of each retaining wall in accordance with the Geotechnical Manual. Prior to preparation of retaining wall layouts, the Engineer shall prepare a comparative cost analysis of different types of retaining walls versus roadway embankment, pavement, soil stabilization, retaining walls type, and available ROW to determine optimum selection based on economics, construction time duration, ROW encroachments (need for construction easements) and construction feasibility. The Engineer shall submit early in the plan preparation the retaining wall layouts to obtain approval from the State. The Engineer shall incorporate all necessary information from above referenced manuals and respective checklists into the retaining wall layouts. For stage construction, the Engineer shall indicate limits of existing retaining walls for removal and reconstruction, and determine limits of temporary retaining walls to be shown on the TCP. For projects designed using Bentley’s OpenRoads 3D modelling Technology, the retaining walls shall be represented in the 3D model. The approximate limits of each retaining wall shall be based on Station or length. The Engineer shall notify the State the type of retaining walls that will be used for and Cut and Fill location. Retaining wall types must include: o Spread Footing Walls (High Footing Pressure Design and Low Footing Pressure Design). The Engineer shall select a spread footing wall for fill situation when considerable room behind the walls is available for forming, constructing, and backfilling the footings and stem. The Engineer shall notify the State when the quantity is less than 1000 square feet to have as option in the plans to cast in place a spread footing wall design. This selection has to be approved to State.

Retaining Walls and Miscellaneous Structures. The ENGINEER will prepare plan and profile layout drawings and structural details for four (4) NB ML Mechanically Stabilized Earth (MSE) retaining wall widenings extensions in GeoPak MicroStation format. Retaining wall plan layouts, elevation, profile drawings, typical wall sections, construction detail drawings and structural general notes and specifications will be in accordance with TxDOT and Green Ribbon Aesthetic design criteria documents. Each Retaining Wall will be analyzed by the Geotechnical ENGINEER for localized “Internal and External Stability” and Global Stability for dry long-term conditions with AASHTO Factors of Safety for sliding and overturning, analyze base bearing pressure resultant bearing pressure to be within mid 1/3 base width and maximum bearing pressure design check. Geotechnical ENGINEER will evaluate global stability for walls with heights greater than 5 feet. ENGINEER will prepare a QA/QC “Retaining Wall Design Criteria and Layout Checklist”. ENGINEER will coordinate closely with Geotechnical Engineers, Surveyors and SUE to develop final retaining wall plans and grading contour plans. Retaining wall details, total quantities and estimate of probable construction cost will be provided by the ENGINEER for the 30%, 60%, 90% and 100% submittals.

Retaining Walls and Miscellaneous Structures. The Engineer shall develop each retaining wall design and determine the location of each soil boring needed for the foundation design of each retaining wall in accordance with the Geotechnical Manual. For projects that have retaining walls, the Engineer shall develop the retaining walls in the 3D corridor model. The approximate limits of each retaining wall shall be based on Station or length. The Engineer shall notify the State the type of retaining walls that will be used for and Cut and Fill location. Retaining wall types must include:  Mechanically Stabilized Earth (MSE) Walls. The Engineer shall prepare the retaining wall layouts showing plan and profile or retaining walls for design by a State approved vendor. The Engineer is responsible for design of geometry and wall stability. The Engineer shall incorporate a slope of 4:1 or flatter from the existing and finished ground line elevation to the face of the retaining wall. The Engineer shall provide layouts (scale 1”=100’), elevations, quantity estimate, summary of quantities, typical cross sections and structural details of all retaining walls within the project. Approximate lengths of the retaining walls as shown on the schematic are listed as below. The Engineer shall determine if any additional walls are required and verify the need for and length of the retaining walls as shown on the schematic. If applicable, the State will provide architectural standard drawings. The Engineer shall incorporate architectural standard drawings into design details. The specific requirements for each item are as follows:

Retaining Walls and Miscellaneous Structures. (OMITTED)

Retaining Walls and Miscellaneous Structures. 160.F.1.a a. Provide Retaining Wall layouts: revise for 2 embankment types 0 160.F.1.b b. Provide Noise Wall layouts: Supplement to add noise wall 2 and revise noise wall 1 Remove NoiseWall 2 Layout as included in SWA1 0 160.F.

Retaining Walls and Miscellaneous Structures. 160.F.1.a a. Provide Retaining Wall layouts: revise for 2 embankment types 1 2 8 16 27 $3,083.06 160.F.1.

Retaining Walls and Miscellaneous Structures. Develop retaining wall locations and preliminary layouts in accordance with the latest versions of the TxDOT Geotechnical Manual, TxDOT Landscape and Aesthetics Design Manual, TxDOT Project Development Process Manual and the TxDOT Bridge Project Development Manual.

Retaining Walls and Miscellaneous Structures. The Engineer shall develop each retaining wall design and determine the location of each soil boring needed for the foundation design of each retaining wall in accordance with the Geotechnical Manual. DocuSign Envelope ID: 82ABE615-A8AB-4523-B50C-6FA5DBECD719

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