Project Update – 10/27/2020
Core drilling activities at the proposed Wild Horse Reservoir site
It’s been a while since we’ve had an update on the proposed Wild Horse Reservoir in Park County. Earlier this year, Aurora Water retained Tetra Tech as our consultant to perform Geological and Geotechnical Investigations. Understanding the site’s geology is critical, especially when you’re talking about a reservoir that could be up to 96,000 acre feet in size.
Since the weather window in Park County is short, Tetra Tech’s crews and subcontractors went to work as soon as they were authorized. Between July 27 and October 2, they completed 16 borings to depths between 150 and 300 feet, taking core samples to tell the story of how the area was formed over millions of years. 26 observation wells are in place to help model groundwater activity, and injection and pumps tests were performed so we could understand the potential for water loss through the reservoir bottom. Gravity measurements were also taken at 885 stations to provide a better understanding of the subsurface geology.
While the results of these investigations are still preliminary, they did confirm that the proposed site, located immediately southwest of Aurora Water’s Spinney Mountain Reservoir, was heavily influenced by volcanic activity over many millenniums. Several known faults were identified and explored for activity rate.
In the end, what does this all mean? We’ll know more in early spring after the data from the investigation have been analyzed, but we’re fairly confident that this site will support what will be Aurora Waters’ largest reservoir. We should also have an updated preliminary footprint for the reservoir, which can help us plan for the design and permitting phases and help us define a timeline for construction.
Click here to read the full article https://www.auroragov.org/residents/water/wild_horse_reservoir