Calpine Corporation's new 1,100 MW Gas Turbine Power Plant required water supply and wastewater infrastructure. GUERNSEY designed approximately:
- 3.5 miles of 36" diameter PCCP raw water line
- Two (2) 16-MGD pumping stations
- 0.5 miles of 30" PCCP process water line
- 50 million gallon water storage reservoir to provide cooling water
- 1,200 LF of 6" diameter potable water
- 9.5 miles of sanitary waste effluent force main
- Dechlorinator system for effluent
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The 36" diameter raw water line, the reservoir and both pumping stations were designed to ODEQ standards and criteria. Calpine Corporation provided these improvements with the ultimate owner being Wagoner County Rural Water District No. 4.
Water supply for the energy facility was proposed to come from an oxbow of the Verdigris River, and be stored and receive primary settling from an off-line reservoir before being treated at the Rural Water District #4 treatment facility. Wastewater from the energy facility was proposed to be discharged to a tributary of Coal Creek and ultimately to the Verdigris River. Additional analysis by GUERNSEY and INCOG indicated that discharge to Coal Creek was not viable because of flow, dissolved oxygen, and temperature restrictions and that the discharge would have to go to the Arkansas River.
Environmental and engineering support included:
- Water quality sampling
- 404 permitting
- Right-of-way acquisition
- PDES permitting
- NEPA Environmental Assessment to obtain Corps of Engineers' clearance for an easement on the banks of the Verdigris River Oxbow
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Issues included the water supply intake structure and water resources impacts, cultural resources related to the pipeline alignments and the wastewater discharge to the Arkansas River (OPDES permit). The NEPA EA resulted in a Finding of No Significant Impact.
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