Dioptra was hired to completed all construction staking and volume calculations for the Ashton Dam Remediation Project. A bypass tunnel was constructed to direct water around the dam and power house while remediation activities were performed. Dioptra provided alignment control for the tunnel construction. this was a unique process as all tunnel survey control was set on the roof of the tunnel. Dioptra also provided HDS and quality control for the bypass tunnel at the Ashton Dam. The scanning data was used to create an accurate 3-dimensional model of the entire tunnel. The model was then compared to the design “template” of the tunnel to determine if any areas were deficient in size/capacity. To accomplish this task, the point cloud model was sampled at two foot intervals to create cross-sections of the as-built tunnel facility.