PSC designed the Fred Hervey Water Reclamation Plant which was placed online in 1985. This facility uses a unique treatment process designed to treat up to 10 MGD of wastewater to drinking water quality and then inject it into the ground for future use. Besides recharging the Hueco Bolson, some of the reclaimed water is used to power generation and for irrigation.

Fred Hervey Sludge Bed Liner Replacement with Keith Rutherford from Parkhill, Smith & Cooper on Vimeo.

One of the final steps in the 11-step treatment process is letting the sludge dry out on lined sludge beds for a minimum of 90 days after going through the clarifiers. The sludge beds original to the plant were constructed with a clay liner covered by a soil cushion and stayed in service for 33 years.

When the original clay-lined beds had begun to deteriorate, PSC was selected to evaluate different liner options and ultimately decided to replace them with a shrinkage-compensating concrete lining. Along with the new liner material, PSC proposed a new layout of the sludge beds to El Paso Water to maximize the surface area of the beds. This use of shrinkage-compensating concrete lining minimizes joints and allows larger slabs to be poured for the new beds. The material also provides abrasion resistance when the sludge is scraped out of the beds for disposal. Each individual slab pour takes about 210 cubic yards of concrete, and there will be 24 different pours to make up the eight beds. The walls between each bed will replace the earthen berms providing a larger bed area and more drying capacity.