O.N. Stevens Water Treatment Plant

Ardurra delivered site evaluation, hydraulic modeling, and design services for High Service Pump Station No. 3 (HS 3) at the O.N. Stevens Water Treatment Plant, replacing aging infrastructure while significantly increasing municipal water distribution capacity. The 97 MGD pump station features 72-inch suction piping to clear wells and 60-inch discharge piping to distribution transmission mains, enhancing total ONSWTP high-service pumping capacity to 177.6 MGD.

The expanded capacity satisfies the TCEQ-approved Alternative Capacity Requirement (ACR) Exception requirements while providing future upgrade capabilities to support long-term municipal growth. Improvements include upgrades to High Service Pump Station No. 2, a 2 MW alternate power expansion, and an advanced SCADA system integration to support reliable operations.

Key Design Components:

• Designed 97 MGD High Service Pump Station No. 3, replacing HS 1 while increasing total ONSWTP capacity to 177.6 MGD

• Engineered 72-inch suction and 60-inch discharge piping connecting clear wells to distribution transmission mains

• Satisfied TCEQ Alternative Capacity Requirement Exception through strategic capacity expansion supporting regulatory compliance

• Implemented comprehensive pump station upgrades, including HS 2 pump and valve rehabilitation with motor management relay systems

• Designed a 2 MW alternate power expansion, ensuring reliable backup power for enhanced system reliability

• Integrated advanced SCADA systems with pump station automation, supporting efficient operations and monitoring

• Provided multi-disciplinary engineering, including hydraulic modeling, electrical, I&C, structural, civil, and geotechnical services

• Delivered complete project lifecycle support from cost estimating through start-up and commissioning

The pump station replacement provides Corpus Christi with enhanced water distribution capacity while meeting regulatory requirements and supporting future growth. Strategic design elements enable system expansion as demands increase while ensuring reliable operations through automation and backup power systems.