1. An Introduction to Contracts and Design Guides Presented by: David Lake, P.E. Roadway Designer Nevada Department of Transportation

2. 3 Questions to think about: 1.) As an engineer you draft a contract. What controls and limits your design?

3. 3 Questions to think about: 2.) Why do we have design guides and manuals?

4. 3 Questions to think about: 3.) How many iterations would a typical set of plans have? How many do you think contract 3554 US95 2A had?

5. Iterations of US95 2A

6. Today’s Goals What you can expect: To get some hands on experience with how to navigate through some of NDOT’s design manuals/guides. To learn how to draw a cross section from a set of plans. To verify quantity calculations on plans. What not to expect: The details of each design guide and all the implications of them. To understand all the items of work on this contract.

7. Agenda - Introduction - Contracts/ plans 1. What is a contract/ set of plans? 2. Basic components and reading a plan set. 3. Contractor’s Flexibility: - Wiggle room/Strict guidelines

8. Agenda 1. Review some of NDOT’s Design guides 1. What are they used for? 2. What are some of the Design Guides NDOT uses? 3. How do Contractors and Engineers use them? 2. Using the plans and design guides to solve a real life issue I encountered on the project.

9. What is a Contract/ Plan Set -Contains the following: Critical survey data Proposed design plan view (x-y) cross sections (y-z) Profiles (x-z) Quantities Property -Doesn’t contain  Calculations  Detailed traffic data  3-D images  Digital files  Unit prices  Design Criteria

10. Basic Components… (Review PDF plan set for reading a set of plans)

11. What areas in the plans does the contractor typically have? Wiggle Room Placement of material Traffic control Ancillaries Dust control Clearing and grubbing Incidentals Contingencies Strict Guidelines Survey data Quantities Alignments Right of Way Specifications

12. What are Design Guides used for… Standardization Dimensions Methods Strategies Guidelines Accountability Instructions

13. 1.) Design Guides used at NDOT AASHTO Roadside Design guide Roadside Slope design Protection strategies for obstructions Guardrail length of need calculations

14. 2.) Design Guides used at NDOT AASHTO Green book Horizontal and vertical design criteria Ramp and traffic movement design lengths Super elevation design Intersection design Roundabout design Interchange design

15. 2.) Design Guides used at NDOT MUTCD Traffic Control Signage Cone Spacing Temporary Barrier Placement Lane Shifting/Merging/termination

16. 3.) Design Guides used at NDOT NDOT Drainage Manual Water Ponding (Spread Tolerances) Design Storms Culvert Selection

17. 4.) Design Guides used at NDOT NDOT Storm Water Quality Manuals Best Management Practices Contamination Control Soil Stabilization

18. 5.) Design Guides used at NDOT NDOT Standard Plans for Bridge and Roadway Construction Details and Dimensions of NDOT items used on projects Quantity Calculations Material Types and Specifications

19. 6.) Design Guides used at NDOT NDOT Specification for Road and Bridge design (Silver book) Work involvement per bid item Disposal of material Tolerances of material/construction

20. 7.) Design Guides used at NDOT NDOT Road Design Guide Drafting standards Plan set content/ descriptions Important one for all CADD work and sheet creation

21. How do the following use the design guides? Engineers Guidelines for roadway layout Pass design criteria Design exceptions Contractors For the details not shown on plans Payment & Completion of tasks Flexibility in a change orders

22. Example RE calls: On sheet 33, in the change order, you display a reconstruct area on the “FRWa” ramp. There is no removal of barrier rail item there, can I remove it?

23. Conclusion: Contracts and Plans Communicates all 3D perspectives of design Quantity verification Future As-Builts Design Guides: Simplifies plans. Information in design guides don’t need to be reiterated on plans. Provide flexible options for constraining situations. Instructions for construction.

24. Questions?