SR 0422-M01, -M02, -M03 Pottstown Expressway

Montgomery and Chester Counties, PennDOT District 6-0

This project involves the reconstruction of 6.1 miles of roadway and 15 bridges or overpass structures, several of which had been rated Critical/Structurally Deficient. Project components include the Pleasant View Road and Park Road overpasses; stream crossings over Sanatoga Creek/Sanatoga Road, Sprogels Run, and the Schuylkill River; two Norfolk Southern rail crossings; replacement of the two Schuylkill River Bridges (providing additional bridge width for construction of the Schuylkill River Trail); and improvements to the Armand Hammer Boulevard Interchange and five other interchanges. Our geotechnical services include performing the boring, sampling, and testing program; providing geotechnical recommendations and pavement design; and preparing the Roadway and Structure Reconnaissance Reports, Roadway Geotechnical Engineering Reports, and Structure Foundation Geotechnical reports. In addition, AEG is responsible for performing Phase 1, 2, and 3 Environmental Site Assessments (ESAs), hazardous waste investigations; wetland identification and delineation; three separate Level 2 CEEs for NEPA clearance, noise analysis; and public involvement. At one of the river crossings, AEG evaluated the use of wick drains (as opposed to overexcavation and replacement) to minimize settlement impacts. For the Phase 2 ESA, AEG conducted non-intrusive geophysical investigations using a Geonics EM-31 Terrain Resistivity/Conductivity Meter to delineate the lateral extent of historic wastewater lagoons located within the project limits of disturbance on both of these sites. Identifying the location of the lagoons with confidence was necessary to ensure that borings would be positioned within these lagoons. The Phase 3 ESA involved a joint geotechnical and environmental drilling program and was conducted to characterize impacted soils. Data collected from borings was used to determine material structural characteristics and potential contaminant levels, ensure worker safety, and provide information to assist in determination of material handling and disposal alternatives, requirements, and costs.