A Second Life
Approximately 23,000 gallons a day, 30 to 40 percent of influent flow, of treated wastewater effluent is reused for wheel washing, facility cleaning and toilets—daily displacing 6,000 gallons of municipal potable water and 17,000 gallons of groundwater from the onsite well field. An additional 35,600 gallons a day of stormwater is treated and reclaimed, primarily for scrubber makeup water that is subsequently treated by the wastewater treatment process. The system not only protects the environment, but provides beneficial water reuse and reduces dependence on municipal supplies. Even dewatered sludge is recycled onsite for reclamation of metals, further reducing environmental impact.
On the Fast Track
Design-build was selected to accelerate the facility’s delivery, allowing it to be online within 10 months. This goal was accomplished even with significant scope changes—changes resulting from our identification of necessary technical elements not included in the original project scope—that were successfully incorporated into the design to meet the expedited schedule. Speeding implementation further was a carefully coordinated construction schedule that had all major equipment installed directly after building slab completion and framing erection and prior to wall panel installation. Additionally, schedule coordination allowed the various building trades to complete their work in a small footprint while avoiding conflicts.
To accommodate the site’s complex hydrology, the facility’s foundation and 105,000-gallon wastewater EQ tank can withstand potentially extreme settlements from a seasonally high groundwater table, extensive clay deposits and perched groundwater. Additionally, the impoundment’s underdrain system prevents liner floating by reclaiming seasonal high groundwater for treatment and reuse. According to Lafond, “CDM Smith’s intelligent design and well-orchestrated delivery approach addressed several project challenges, including a very aggressive schedule, difficult landscape, variable treatment and a strict budget.” CDM Smith provided startup services, operator training, and an operations and maintenance manual, and is providing the facility’s supervising operator.