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Pine Valley Tank Rehabilitation

Matrix assessed Colorado Springs Utilities’ (CSU's) 10-million-gallon McCullough Reservoir located on United States Air Force Academy (USAFA) property for this project. CSU had very few record drawings for the reservoir and knew that only minor cleaning and routine maintenance had been performed inside the underground concrete reservoir since its construction in the 1960s.

This and an adjacent reservoir provide almost 80% of all Colorado Springs’ water and could only be taken out of service for a limited time in November. To perform the assessment, Matrix coordinated with CSU Operations and USAFA security personnel to ensure access to the reservoir during the limited assessment window.

The inspection showed that a butterfly valve separating the two chambers of the tank was rusted open. Existing steel ladders were significantly corroded, and the reservoir lacked other safety features near the effluent pipe that created fall hazards. The existing concrete also exhibited some spalling and cracking that necessitated repairs.

Matrix supported the contractor with daily construction observation, responding to RFIs and submittals, attending weekly construction and progress meetings, and preparing record drawings at the completion of construction.