Parsons Selected as Design-Builder for the Plant’s $60.6 Million Phase V Expansion
West Basin Municipal Water District (District) awarded Parsons the largest water reuse contract ever undertaken by the District to be completed on a design-build basis. Parsons was selected as design-builder for the plant’s $60.6 million Phase V expansion, water purification facilities (microfiltration, RO, and ultraviolet advanced oxidation process facilities) expansion.
- Designs (conceptual, preliminary, detailed)
- General Contractor
- Project Controls/Scheduling
- Fast Track Design
- Quality Assurance/ Quality Control
- Permitting and Regulatory Compliance
Only Facility in the World that Produces Five Types of Recycled Wastewater
Located in El Segundo, CA, the Edward C. Little Water Recycling Facility (ECLWRF) is known as the only facility in the world that produces five types of recycled wastewater. It receives secondary effluent from the city of Los Angeles’ Hyperion Treatment Plant for use in irrigation, industrial processes, and seawater barrier. Since its original construction in 1995, this is the fifth expansion which brought it from 30-mgd to 46-mgd capacity.
Under the plant’s $60.6 million Phase V expansion, water purification facilities (microfiltration, RO, and ultraviolet advanced oxidation process facilities) were expanded to produce an additional 5 mgd of water to be supplied to the seawater barrier to prevent seawater intrusion and recharge groundwater supplies. A single-pass RO membrane water purification system at the Chevron facility also brings an additional 500,000 gpd to NRG’s El Segundo Power Plant.
Ozone Generator System Added
Other Phase V work included an ozone pretreatment facility consisting of an on-site ozone generation system, in-pipe ozone injection system, and a 200,000-gallon degas-defoam basin; irrigation water facilities including the Title 22 high-rate clarification unit, and various solids handling facilities including gravity belt thickeners, thickened sludge pumps and holding tanks, and sludge conditioning tanks that were added to the ELWRF to improve water quality and efficiencies at the plant.
Design Completed on Schedule
The design was completed on schedule in seven months. The design was divided into multiple packages coordinated with requirements of the construction schedule. Each design package was reviewed by multiple consultants and experts hired by the District for compliance with design requirements at three stages of design completion and the input from those reviews was incorporated into the design. During the design phase, the District ranked Parsons’ performance as Exceeding Expectations in all applicable categories.
State of the Art Software Used to Develop CPM Schedule and Manage Construction
Parsons used Primavera (P6) to develop a fully resource loaded Critical Path Method (CPM) schedule. This identified any critical schedule issues, plant operation constraints, and regulatory requirements early in the project to avoid delays. Face-to-face schedule reviews with the District ensured that variances and potential impacts were brought forward for discussion and early resolution. The schedule reflected the following equipment procurement tasks as individual schedule activities: Equipment Submittal, Submittal Review, and Approval, Release for Fabrication, Factory Testing, Delivery, Installation, Manufacture’s Startup and Certification. This allowed all activities be tracked and reviewed to maintain schedule and ensure timely delivery, installation, and startup.
Parsons used Primavera/Oracle Construction Manager (CM) for document control and to track RFIs. Parsons also used Timberline to provide cost estimates for change orders at the field office. All field engineers used AutoCAD for quality control and pipe layout design, which increased productivity when small design modifications were needed. Parsons set up a fileserver on site to allow for quick exchange of drawings and files among field personal. A Project Collaboration Portal (PCP) based on MS Sharepoint was set up to allow information exchange with vendors and other external stakeholders.
Parsons Committed to Success Factors
Key features of the proposed Parsons approach included commitment to conducting extensive local outreach to hire from within West Basin’s service area, focusing on small and minority owned businesses and union labor; commitment to accelerated schedule; and bringing recycled water sooner to meet customer needs.