PC Construction Company CASE STUDY: ABINGDON WATER TREATMENT PL ANT Location Abingdon, Maryland Contract Value $62.8 million Completion Date May 2012 Delivery Method Design-Bid-Build Owner Harford Country Department of Public Works Designer Hazen and Sawyer Challenge During the expansion of the Abingdon Water Treatment Plant, significant excavation was required to construct new facilities. A major challenge was protecting critical utility infrastructure located within mass excavation areas. These existing structures included 4160-volt electrical duct banks and a 36-inch water main with unrestrained mechanical joints and an internal pressure of 90 pounds per square inch (psi). New piping for the expanded facilities required installation below the water main at eight locations and un

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