DLZ provided a staff of engineers, field technicians, laboratory technicians and surveyors to perform surveying services, construction monitoring and field and laboratory quality assurance testing for the relining of the reservoir floor. During Pre-Construction, DLZ performed numerous surveys, participated in the Board of Consultant meetings with the Federal Energy Regulatory Commission (FERC) and confirmed the asphalt concrete mix designs in the laboratory. All work was governed by FERC’s Chapter 14 Engineering Guidelines.
This multi-million dollar construction project included milling 3-4 inches of the existing surface, placement of 3-4 inches of hydraulic asphalt concrete over the entire 86.8 acres of the reservoir floor, 12.6 acres received 3 layers of geosynthetic materials (1 layer of geomembrane and 2 layers of geotextiles), 8-12 inches of compacted asphalt millings and 4 inches of open graded asphalt concrete beneath the hydraulic asphalt concrete.
Each bituminous mixture was tested in the laboratory for numerous material properties and in the field for density, temperature and thickness. Laboratory testing on the bituminous mixtures included marshal compaction, rice, AC burn-off, flow and stability, sieve-analysis, density, penetration, softening point and permeability. The millings and other imported backfill materials were tested in the laboratory for proctors and moistures and in the field for compaction.