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The Shores Ponds A-E


Frederick, CO

This was an extensive Design-Build water storage project encompassing five separate gravel pits within the site: Ponds A, B, C, D, and E.

Ponds B through D have individual slurry walls constructed around each pit, while Pond A has a combination of a clay liner with a cutoff wall that ties into it. After waiting for Pond E to be mined out, Hall Irwin constructed a clay liner around it as well, utilizing the bottom shale. The ponds are linked through a series of interconnects, inlet structures, and a pump station--nearly all of which was installed by Hall Irwin. These elements work together to allow for the largest amount of water conveyance both in and out of the reservoirs.

The sum length of the slurry walls installed at this site is 23,150 LF. Backfill was keyed into bedrock at a maximum depth of 32 feet, creating approximately 4,500 acre-feet of water storage for this owner. All five walls passed the State of Colorado Certified Leak Test. ​

During the 2013 floods, the Pond D slurry wall was breached. Hall Irwin was asked to repair the damage, which required the rebuilding of two sections, each approximately 200 feet long. To accomplish a sound repair, we tied into the competent slurry wall at four locations. We also reconstructed 1,985 LF of adjacent gravel roadway, repaired 2,775 LF of the nearby Godding Ditch, and removed 70,000 CY of silt that had flowed into the cell.

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