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Friday, 25 September, 2015

Rocky Pen Run Reservoir


Summary

The Rocky Pen Run Reservoir dam excavation and foundation preparation project was one phase of a multi-phase construction project that created additional drinking water reserves for Stafford County, VA. The Rocky Pen Run Reservoir is located approximately one mile upstream of the convergence of Rocky Pen Run with the Rappahannock River. 

After completion in late 2013, the new earthen dam created a reservoir capable of storing 5.3 billion gallons of drinking water. A river intake, pumping station, and transmission pipeline were constructed in a prior phase. In this dam excavation and foundation preparation phase, contractors diverted the stream and created the dam foundations. 

The scope of work for this phase included: clearing 28 acres of land; the construction of a reinforced concrete pipe (RCP) diversion to temporarily reroute Rocky Pen Run around the future dam location; providing a suitable foundation for the new earthen dam; excavation to rock; and foundation cleaning.

The general contractor commenced construction operations in spring 2010. The foundation drilling and grouting work was substantially complete in summer 2011. 

O’C&L was retained to provide litigation support services related to a dispute that arose between the general contractor and its specialty subsurface drilling and grouting sub-contractor. Specifically, O’C&L preformed various cost, schedule, and lost productivity analyses (measured mile and earned value). O'C&L issued several expert reports, as well as a rebuttal report, during various stages of the legal proceedings. In addition, O’C&L presented its expert analyses and findings to various parties involved in the matter at a mediation hearing.



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