Skip to main content

Design Build after the Sell: The Mechanics

Buy Article:

$17.50 plus tax (Refund Policy)

Or sign up for a free trial


The biosolids management program being developed by DC Water is distinguished by the use of innovative technology (thermal hydrolysis for enhanced digestion kinetics), dedication to sustainability (energy recovery and Class A residual solids), implementation on a massive scale (407M investment), and employment of multiple delivery formats for component projects (traditional design-bid-build for site preparation and final dewatering, alternative design build for the main process train, and alternative design-build-operate for combined heat and power). The biosolids program management team assembled by DC Water faced significant challenges to adapt the traditional project delivery mechanisms that have been used in the past for procurement, negotiation, design, and construction using two different alternative project delivery approaches on major elements of the biosolids program.

Contract documents including drawings and specifications for traditional design-bid-build projects recognize that the design engineer and construction contractor have separate contractual relationships with DC Water but no direct relationship with each other. In alternative delivery type projects, the design engineer and construction contractor are integral components of the design-build team and individually may have no direct relationship with DC Water. The subtle differences in roles and relationships of various participants in the delivery process have a significant impact upon the development of drawings and specifications used in procurement for alternative project delivery.

The development of the procurement package faced two conflicting needs, i.e. the need for ample review time versus the need for rapid program development. In an effort to address both needs, the biosolids program team established a series of discipline oriented workshops to allow technical input from DC Water engineering, operations and maintenance personnel without adverse impact on project schedule. Although equipment were not pre-selected or pre-qualified due to schedule constraints (exception being the Thermal Hydrolysis Process and Distributed Control System vendor), the request for proposal procurement documents do include prescriptive requirements for design aspects, process choices, sizing, controls, and equipment reflecting lessons learned in the construction, operation, and maintenance of existing facilities at Blue Plains. This paper presents the development after alternative project delivery selection of procedures and documents to achieve a balance between maintaining established DC Water quality standards and allowing innovative design-build proposals.

Keywords: Alternative Project Delivery; Biosolids; Combined Heat and Power; DC Water; Design-Build; Design-Build-Operate; Thermal Hydrolysis

Document Type: Research Article


Publication date: 2011-01-01

More about this publication?
  • Proceedings of the Water Environment Federation is an archive of papers published in the proceedings of the annual Water Environment Federation® Technical Exhibition and Conference (WEFTEC® ) and specialty conferences held since the year 2000. These proceedings are not peer reviewed.

    A subscription to the Proceedings of the Water Environment Federation includes access to most papers presented at the annual WEF Technical Exhibition and Conference (WEFTEC) and other conferences held since 2000. Subscription access begins 12 months after the event and is valid for 12 months from month of purchase. A subscription to the Proceedings of the Water Environment Federation is included in Water Environment Federation (WEF) membership.

    WEF Members: Sign in (right panel) with your IngentaConnect user name and password to receive complimentary access. Access begins 12 months after the conference or event
  • Subscribe to this Title
  • Membership Information
  • About WEF Proceedings
  • WEFTEC Conference Information
  • Learn about the many other WEF member benefits and join today
  • Ingenta Connect is not responsible for the content or availability of external websites
  • Access Key
  • Free content
  • Partial Free content
  • New content
  • Open access content
  • Partial Open access content
  • Subscribed content
  • Partial Subscribed content
  • Free trial content
Cookie Policy
Cookie Policy
Ingenta Connect website makes use of cookies so as to keep track of data that you have filled in. I am Happy with this Find out more