Allegheny County Sanitary Authority (ALCOSAN) is implementing a federally mandated Wet Weather Plan (WWP) to eliminate sanitary sewer overflows (SSOs) and significantly reduce combined sewer overflows (CSOs) into the Allegheny, Monongahela, and Ohio Rivers. The approximately $2B program involves constructing approximately 17-miles of 18-foot diameter regional tunnels in sedimentary rock, overflow mitigation measures, green solutions, and a new 120-mgd Wet Weather Pumping Station.  Schnabel, as part of the Program Director, Program Management and Pumping Station Design Teams, provided technical and strategic resources to the owner.

As part of the Program Director Team, Schnabel was a technical resource for geotechnical and tunneling expertise and provided strategic advice to manage program risks. Specifically, overseeing program wide geotechnical standards, implementing the Phase I geotechnical investigation, and conducting investigations of prior, local tunnel construction experience. As part of the Tunnel Program Management Team, Schnabel continues to assist ALCOSAN by performing tasks that include guidance regarding site selection and feasibility studies, cost estimating and scheduling, risk identification and mitigation, construction contract document reviews, and a continued role providing oversight of geotechnical investigations. we also introduced the use of geographic information systems (GIS) analysis to augment the site selections and feasibility studies as well as to create a program-wide geologic map.