Section 4: PS&E DevelopmentAnchor: #i1006724
This group of activities represents the final design stage of the project development process. The landscape architect(s) assigned to the project at this stage are responsible for guiding the development of the landscape and aesthetic related portions of the project as well as coordinating preparation of PS&E for related environmental mitigation called for in permits and agreements.
Many of the elements that impact on landscape and aesthetic design overlap into all parts of the final design process. Typically these areas include:
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- bridge design Anchor: #OBYPUFNN
- lighting design Anchor: #NACAEFAC
- roadway design Anchor: #FGWSPKBB
- hydraulics Anchor: #AHYUQIBR
- environmental mitigation
Each of these design areas will have responsibility for roadway components that must be coordinated to meet landscape and aesthetic design goals of the project. The TxDOT landscape architects together with any consultants have the responsibility for coordination between the various areas of responsibility.
This section groups tasks into the following areas:
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- design conference and detailed design plan Anchor: #RTCYNMMQ
- final alignment profiles Anchor: #FMBHKBGC
- roadway design Anchor: #QMQACTKW
- operational design Anchor: #RBHBDLNW
- bridge design Anchor: #THGTYACX
- drainage design Anchor: #GDTNOOYI
- retaining/noise walls and miscellaneous structures Anchor: #CJXVGYQO
- PS&E assembly and design review
A final note in this section discusses the nature and timing of the process, which may vary slightly based on specific situations in each project.Anchor: #i1006837
Design Conference and Detailed Design Plan
The primary instruments for ensuring that landscape and aesthetic goals will be met are the Landscape and Aesthetics Assessment and the Landscape and Aesthetics Master Plan. (LAMP) The following subsections describe how the landscape architect may participate in the project development steps to obtain additional or updated data and conduct design conference.
After the design conference, the landscape architect will participate in detailed design and follow through to final design plans, specifications, and estimates. Subsections in this section describe how landscape architects contribute to the process for the following design areas:
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- plan sequence of construction Anchor: #VGCFAOLJ
- design environmental mitigation details Anchor: #FHAFSLVN
- review data collection needs
Obtain Additional or Updated Data (5010)
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- Visit the site and prepare brief summary of existing conditions; note any conditions that will require additional field information. Anchor: #EKGMHOTM
- Advise the project manager of any additional data requirements necessary to complete landscape and aesthetic based plan work.
For specific information on this project development task, refer to the PDPM under the task number referenced in the subsection heading.Anchor: #i1006897
Conduct Design Conference (5020)
The project landscape architect should attend all design concept meetings to be aware of all the concerns impacting on the final design.
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- Provide the project manager with information related to landscape and aesthetic issues that will impact the preparation of the work plan and schedule; be alert to seasonal timing related to revegetation and reforestation of all types. Anchor: #UKMLGDME
- Advise the project manager in writing of any needs for special consultants or recommendations for in-house staff assignments. Anchor: #AHTNURRM
- Prepare scope of services for landscape and aesthetics related consultants.
For specific information on this project development task, refer to the PDPM under the task number referenced in the subsection heading.Anchor: #i1006928
Plan Sequence of Construction (5040)
The construction sequence often involves a variety of water quality measures and temporary erosion control issues where the landscape architects expertise can be utilized.
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- Project landscape architect advises the project manager of suggested order of revegetation, erosion control, and reforestation; consideration should be given to phased planting early in the construction process to minimize cost of temporary erosion control.
For specific information on this project development task, refer to the PDPM under the task number referenced in the subsection heading.Anchor: #i1006949
Design Environmental Mitigation Details (5100)
Different groups depending on the project, the district, and the nature of the work prepare Environmental mitigation plans. In most cases the landscape architect is the professional with knowledge of design involving biologic processes and the skills needed to coordinate the preparation of technical PS&E. The goal of this part of the process is to meet the environmental commitment with the most cost effective and sustainable solution.
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- Provide services necessary to coordinate the preparation of final PS&E for biological mitigation plans.
Review Data Collection Needs (5120)
Review data requirements for developing final PS&E for landscape and aesthetic elements and for any environmental mitigation work that is being included in the contract.
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- Advise the project manager of any additional data needs for preparation of PS&E.
Final Alignment Profiles
The project landscape architect should review the development of final alignments and advise the project manager of issues related to revegetation and reforestation and erosion control.Anchor: #i1007001
Design Final Vertical and Horizontal Alignments (5200)
As the alignments are finalized the project landscape architect should finalize the work schedule for completion of PS&E for landscape and aesthetic design.
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- Review final alignments; advise the project manager in writing of any special requirements for erosion control, revegetation, or reforestation related to alignment decisions.
During this step, the landscape architect will assist with tasks to:
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- design landscape/aesthetics plans Anchor: #LNCVICDW
- develop plan and profile sheets Anchor: #FALWKMUU
- design bicyclist and pedestrian facilities Anchor: #KFIDEMYH
- design miscellaneous details
Design Landscape/Aesthetics Plans (5280)
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- Distribute the corridor LAMP elements to all design sections involved in the project; indicate those portions of the plan that may have a significant impact on final design. Anchor: #HXOKYMFL
- Provide coordination services with all design units related to landscape and aesthetic concerns. Anchor: #KCAPDOFF
- Hold a landscape and aesthetics conference to review specific landscape and aesthetic goals and to discuss issues that need to be addressed in preparation of the final plans. Anchor: #WSYFYIPG
- Distribute copies of the LAMP for the project corridor. Anchor: #UIISMQCY
- Advise each section in writing of special provisions that may impact the final design. Anchor: #LMWCQRVO
- Coordinate the preparation of final plans that relate to landscape and aesthetic issues.
Develop Plan and Profile Sheets (5290)
On projects where reshaping of the land is desirable for reasons of aesthetics or to assist in the revegetation and erosion control process the landscape architect should work with appropriate design sections to achieve the design goals.
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- Advise roadway design of any areas involving special earthwork; this would relate back to work in development of the final alignments.
Design Bicyclist and Pedestrian Facilities (5300)
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- Prepare plans for pedestrian and bicycle accommodation; coordinate with roadway design or other appropriate design sections on alignments and special pavement treatments.
Design Miscellaneous Details (5330)
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- Prepare miscellaneous details for landscape and aesthetics related treatments; this includes details for walls, pedestrian accommodation and amenities, special surface treatments, etc. Anchor: #BGNSPSHG
- Develop special details related to pedestrian, bicycle, or landscape treatment and forward to roadway design.
This step encompasses a plan for illumination design.Anchor: #i1007169
Design Illumination (5380)
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- Forward recommendations for special hardware, poles etc. to bridge and roadway design to coordinate the aesthetic character of the corridor.
In the bridge design step, the landscape architect may be called upon to assist with detailed bridge design plans.Anchor: #i1007195
Prepare Bridge Details (5500)
Landscape and aesthetic details of the project should be coordinated with bridge details. It is important that bridge details are consistent with and complementary to the elements of the LAMP.
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- Coordinate aesthetic design details with bridge design; work with bridge section to integrate all landscape and aesthetic details.
In drainage design, the landscape architect contributes to tasks that:
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- prepare culvert and storm drain details Anchor: #XDIDIIDT
- design storm water pollution prevention plan
Prepare Culvert and Storm Drain Details (5570)
There are a number of structures involved in the final design of the drainage system. As appropriate, details of drainage structures should be developed to fit into the landscape and aesthetics scheme of the corridor. This includes elements such as head- and end-walls, guardrails, and pumping facilities. The primary goal is to ensure that the style, finishes, and materials are consistent with the LAMP.
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- Advise the hydraulics section of any design inconsistencies with the LAMP.
Design Storm Water Pollution Prevention Plan (SW3P) (5600)
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- Recommend seeding and planting for temporary and permanent erosion control; advise on the application and PS&E for use of bio-technical stabilization techniques. Anchor: #VRLUEREU
- Forward details for permit purposes.
Retaining/Noise Walls and Miscellaneous Structures
This step includes efforts to prepare retaining and/or noise wall layouts, plans, and detailed design.Anchor: #i1007292
Prepare Retaining and/or Noise Wall Layouts (5640) and Prepare Retaining and/or Noise Wall Plans and Details (5680)
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- Work with appropriate design section(s) on landscape and aesthetic issues related to wall locations. Anchor: #RNGOPNIM
- Review retaining wall layouts and details; make recommendations for finishes and treatments the fit the LAMP.
For specific information on these project development tasks, refer to the PDPM under the task numbers referenced in the subsection heading.Anchor: #i1007313
PS&E Assembly and Design Review
During PS&E assembly and design review, the landscape architect will be involved with work to conduct environmental re-evaluation and determine resulting plan changes. The landscape architect may also help the prepare PS&E package and be involved as the district performs final review of PS&E.Anchor: #i1007327
Conduct Environmental Re-Evaluation and Determine Resulting Plan Changes (5810)
This is the step in the process that brings together activities in the Preliminary Design Process with the Environmental Process during Plans Specification and Estimate (PS&E) development.
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- Project landscape architect provides project manager written comments documenting changes in approved preliminary schematics as a result of the environmental process.
Prepare PS&E Package (5830)
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- Provide project manager with all PS&E documents prepared by landscape section.
District Performs Final Review of PS&E (5900)
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- District landscape architect or consultant participates in the review of PS&E Package.
Nature and Timing of the Process
The process as outlined here, and in other manuals, appears linear. This is not the case. The process is iterative and seldom follows an orderly pattern. Each project will be different and involve varying degrees of input at each point in the process. What is important is that the landscape architects or appropriate consultants be active in the process, and provide input on landscape and aesthetic issues to ensure that the highway corridor meets department and client expectations.