Wednesday 9:30 AM
[Presentation PDF]

Room: Governor

Managing Risk in a Multi-Phased Project - MWRDGC's Stickney WRP Westside Imhoff Tank Replacement Project

MWRDGC's Stickney WRP has currently been designed for process improvements in their Westside Treatment Plant. This decade-long mega project has been divided into three construction phases to avoid significant delays and risks in construction and to maintain continuous preliminary treatment and operation of the plant during construction. The first contract involves the demolition of Imhoff Tanks Battery A and Skimming Tanks No. 1 - 8. This site preparation contract will provide necessary information on the geo-technical characteristics of the site for future construction of 18 new Primary Clarifiers and Aerated Grit Facility under subsequent contracts. We were able to understand the difficulties involved in sludge pumping which is the most critical activity for this phase. Executing the demolition contract prior to new facility construction has allowed the project team to collect valuable information to reduce the overall risk and potential for significant change orders including time delays in subsequent construction phases.

Moderator:  Dan Collins


Prabhushankar Chandrasekeran - Greeley and Hansen LLC

Mr. Prabhu has over 6 years of engineering experience in water and wastewater design and construction. He is currently a project manager at Greeley and Hansen, a leading environmental consulting engineering firm dedicated to the water and wastewater industry.

Mr. Prabhu has served as project manager for a wide variety of water and wastewater engineering planning and design projects for public utilities and agencies. In addition to these activities, he is also involved in planning and design of facilities at wastewater treatment plants and engineering services during construction.

He has been a member of the Water Environment Federation since 2006 and has been actively involved in numerous WEF and Young Professional activities.

Mr. Prabhu received a Master's Degree in Environmental Engineering from Illinois Institute of Technology and a Bachelor’s degree in Civil Engineering from Anna University, Chennai, India. He is a registered professional engineer is the state of Michigan.

Paul O'Brien - Metropolitan Water Reclamation District of Greater Chicago

Mr. O’Brien is the Principal Civil Engineer with the Metropolitan Water Reclamation District of Greater Chicago.  Working in the Plant Design Management section of the Engineering Department, he is involved with the design of new sludge thickening facilities and the replacement of Imhoff tanks with primary clarifiers at the Stickney WRP, a 1200 MGD facility located in suburban Chicago.  Prior to these projects, he was in the Construction Division, working as a Resident Engineer at the District’s three largest plants.  He has been with MWRDGC for fifteen years and is a 1993 graduate of Purdue University.

Joe Gorgan - Greeley and Hansen LLC

Mr. Gorgan has thirty years of experience in the design and construction of new and rehabilitated wastewater treatment facilities.  He leads the firm’s Technical Services Center (TSC), which leads the firm’s initiatives in seeking out and identifying new technologies and identifying and managing project risk for clients.  He has served as project manager providing facilities planning, preliminary and final design, preparation of projected cost opinions, O&M manual preparation and office construction services.

Mr. Gorgan is also the Project Director for the replacement of existing preliminary treatment facilities at the Metropolitan Water Reclamation District of Greater Chicago’s 720 mgd Westside Plant which is part of the 1,440 mgd Stickney Water Reclamation Plant, Stickney, Illinois.

Mr. Gorgan received his M.S. in Environmental Engineering and B.S. in Civil Engineering from Illinois Institute of Technology, Chicago.