EATING AN ELEPHANT: SSO ELIMINATION PROJECT TAKES MANY BITES

摘要

The Western Westmoreland Municipal Authority (WWMA), located 20 miles east of Pittsburgh, PA, is implementing system improvements to eliminate Sanitary Sewer Overflows (SSOs) along Brush Creek as required by a Consent Order and Agreement (CO&A). The project was executed in multiple steps including a permanent flow monitoring program, development of a hydraulic and hydrologic model, and evaluation of alternatives. The culmination of this effort is the design and construction of a three-phase project. Phase 1 includes upgrades to an active wastewater treatment plant (WWTP) and a new 7-MG equalization (EQ) storage tank and 45-MGD pump station. Phases 2 and 3 will feature 7 miles of interceptor improvements. This presentation highlights the challenges faced during planning, design and construction of the three-phase project. These challenges include, but are not limited to, site constraints, coordination of six member-municipalities, construction in and around a stream, and addressing raw sewage pump air locking and pump vibration issues.