GBI can prepare and deliver Quality Level D and Quality Level C mapping of existing underground utilities to assist project managers, engineers and designers during design phase and manage risk due to unexpected buried utilities during construction phase.
Quality Level D (QL-D) is the most basic level of information for utility locations and is derived from record information, site conditions and verbal recollections from those familiar with a certain area. The data is compiled and mapped on a drawing with the QL-D designation. QL-D utility information is primarily used during the planning phase of projects and consists of the least accurate utility information.
Quality Level C (QL-C) involves the surveying of visible utility appurtenances (fire hydrants, valves, manholes, etc.). QL-C SUE produces a more accurate product because it takes surveyed data and correlates it with the QL-D record information.