Transcript Slide 1
WSDOT Design-Build Contracting Jeff Carpenter Paula Hammond State Construction Engineer Secretary of Transportation J.C. Lenzi Assistant Secretary Engineering and Regional Operations 2011 AASHTO Subcommittee on Construction Virginia Beach City, VI August 2, 2011 WSDOT Design Build Experience • Began as ‘One-off’ Mega projects delivery tool • Selection process has been primarily two step/short list with stipend • Best Value determined as proposal price adjusted by technical score • WSDOT moving to Strong Owner role, no longer Engineer of Record • Adapting our design practices to Contract Standards WSDOT – Design-Build “advantages” • Cost Certainty • Scope Control • Can drive immediate innovation during procurement • Lower owner personnel commitment • Design-Build model works well on complex and larger projects Roles and Responsibilities - Design Design Builder Prepares and stamps the design – Engineer of Record Owns risk of design errors – no change order for plan omissions or survey errors Maintains files and design documentation Accepts quantity/cost risk Performs Construction QC/QA Owner Prepares preliminary design approval document used to determine deviations if Design Builder makes changes “ACCEPTS” the design – at the end of the project Verifies that the Design Builder is meeting WSDOT standards with over-theshoulder reviews and audits Responsible for environmental permitting 4 Roles and Responsibilities - Construction Design Builder Performs Quality Control Performs Quality Assurance Responsible for finding solutions to problems encountered Responsible for environmental compliance Accepts Constructability Risk of their own design Accepts Schedule Risk Certifies Materials Quality/compliance with Federal funding requirements Initial Differing Site Condition Risk is assigned to DB via a project ‘deductible’ Owner Provides Quality Verification Over the shoulder review and comment of engineering solutions Administration and payment of contract Assumes responsibility for catastrophic risk * 5 Ongoing/Future Efforts • Outreach/contact with industry – AGC/ACEC/WSDOT Design Build Team – WAPA • Outreach/support/education to projects • Incorporate Design Build in a Design Bid Build agency – Expanded use of DB on mid-sized projects • Establishing a consistent selection process for DB projects • Standardizing the contract template documents • Introducing scalability – for use on small projects • Increased use of DB to meet agency resource limitations