Dona Ana Water Tank Rehabilitation
We have recently finished the planning and design for the rehabilitation of the four water tanks in Dona Ana. Due to the age of the tanks (20 to 35 years), our engineers have recommended that all four water storage tanks be sandblasted and recoated with an epoxy-based coating for the interior and a polymer-based coating for the exterior surfaces. These tanks provide the water storage for over 4,000 homes in our service area. It was also recommended that an investigation of the current corrosion levels should be completed for each of the tanks during construction in order to determine the necessary replacement, if any, of steel components prior to recoating. The funds have been secured for the construction portion of this project. This project is expected to begin constuction April 2022.
Contractor: D & R Tank
Engineer: Bohannan Huston, Inc.
Contract Amount: $2,444,329
Funding Agency: Water Trust Board
Dona Ana Village Liftstation and Forcemain
The funding for the project is through the New Mexico Finanice Authority Colonias Infrastructure Board. The Dona Ana Village Liftstation and Forcemain project is curerntly in the planning and design phase. This project is for the rehabilitation of the existing lift station, force main, and related infrastructure. This wastewater system is the backbone of our wastewater infrastructure. The system was originally built in 1997 by Dona Ana County, then in July 2017 the system was transferred to Dona Ana MDWCA. Wastewater from the Village of Dona Ana collection system reaches the Dona Ana Lift Station via a series of gravity sewer lines. The wastewater collects in an 8-ft diameter by 24-ft deep wet well. When the well fills to certain depths, the lift station activates and pumps the accumulated wastewater through the force main alignment approximately 3.3 miles southeast.
The lift station has extensive levels of corrosion and deterioration as well as problems with overall functionality. The existing polyvinyl chloride “T-Lock” style liner has separated at several seams leaving the concrete wall of the 8-ft diameter wet well exposed to a corrosive environment. Additionally, the concrete ceiling of the wet well does not currently have any protective covering. Electric conduits routed though the wet well show signs of extensive corrosion. The existing electrical junction box located between the wet well and valve pit is weathered and unsafe. Pump number #1, while functional, rests tilted in position at the bottom of the wet well.
The existing 8-inch ductile iron force main has failed in a number of locations requiring the replacement of several sections of pipe. The profile of the force main is such that there is a high point located at the southern most end of Cristo Rey Street as the line exits the Village. There is an air & vacuum release valve installed at this point. Following the end of a pumping cycle, the section of force main between the lift station and high point should remain full. The remaining 11,600 feet of force main slowly or partially drains into the discharge manhole located at the north side of Los Venados Subdivision. The resulting partially full line has likely been attacked by the formation of sulfuric acid which has been deteriorated the existing ductile iron force main.
Engineer: Bohannan Huston, Inc.
Funding Agency: New Mexico Finanice Authority Colonias Infrastructure Board
Should you have any questions or concerns with regards to any of these project please contact Jennifer Horton at (575) 526-3491.