We installed a temporary cofferdam for the construction of a new headworks/pump building that is part of the Waste Water Treatment Plant upgrades in Warren, PA. The cofferdam consisted of 98 pairs of PZ-35 sheet piles, driven to a depth of approximately 45 feet. The sheets were driven through 10 feet of loose sand and approximately 35-feet of dense to very dense sands and gravels, before the sheets ultimately ended on bedrock. In some locations the borings indicated blow counts in excess of 60 present throughout the driving zone. The sheets were installed using an HPSI 500 vibratory hammer with an 80-ton crawler crane. A 3 foot square reinforced concrete ring was installed inside the cofferdam to resist overturning. The General Contractor was able to excavate the required 28 feet depth to install the new headworks and pump buildings.
Job Name: Warren Waste Water Treatment Facility
Job Location: Warren Waste Water Treatment Facility
Job Type: Driven Sheet Piling
Start Date: March 2014
Completion Date: January 2015