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This project for Holder Construction included turnkey site development for the improvements to Infinite Energy Center. Services involved the installation of a precast underground detention system (668 precast pieces that equal 571,535 CF of storage), excavation of 100,000 CY of dirt, temporary Beam and lagging shoring wall, and a temporary dewatering system with permanent underdrain system. The purpose of this vault is to handle the future stormwater runoff so the owner can develop the existing site into a large multi-use development. This underground detention system is one of the largest ever installed in the Southeast.
Other aspects of the site development services include an overhaul of the existing asphalt surfaces as well as the creation of new roads and parking areas. The asphalt services included 24,275 SY of new asphalt surface, 14,964 SY of asphalt remediation, 10,300 SY of permaflex services to amend poor existing conditions, and 7,725 of curb and gutter.
Utility services to support future improvements included new water mains, storm sewers, and sanitary sewers. The waterline consisted of 1100 LF of new 12” ductile iron water to provide new fire and domestic services to the site. To facilitate this new line, a 120 LF bore had to be done across a busy four-lane road.
Infinite Energy Center/Holder Construction
There were several challenges associated with this project. The groundwater elevation was approximately 12’ above the bottom of the excavation which meant all of the soil was saturated prior to beginning excavation. With extremely tight site conditions, our team was faced with how to shore the excavation as well as gain access to the bottom for construction purposes.
The high water table also created poor soil conditions. The soil was extremely wet and had to be constantly dewatered to be excavatable. The design also changed during the construction process which resulted in numerous schedule delays.
To combat the issue of groundwater, our team worked with dewatering experts to create a system that drew the water table down below our subgrade. These solutions consisted of a WellPoint system surrounding the excavation as well as a sump system to handle all surface water accumulation. The WellPoint system had to have redundancy pumps to ensure it never shut off, as losing the dewatering pumps overnight could have resulted in days of lost schedule time.
To address the soil conditions, our team worked with Geotechnical experts to provide many different soil remediation solutions. We were able to find the most cost-effective solution, which was treating the existing unsuitable dirt with lime creating a suitable backfill material. This created substantial savings for the owner over having to export the unsuitable dirt and import suitable. In addition to the cost savings to this approach, it also saved time which made up for some of the schedule delays due to design changes.