Hallen Construction is an expert in small hole technology, a process that is employed with vacuum excavation. With small hole technology, we utilize coring machines that cut an 18-inch circumference from the pavement and extract the core. The crew then excavates a small opening and completes the repair or test pit. Once the repair is completed, the excavation is backfilled and the core is reinstated – which means no repaving is required. This process reduces environmental and surface replacement costs and is less disruptive to the communities that we serve.