An initiative to reconstruct more than 6 miles of SR 0422, including 15 structures
- Owner: PennDOT District 6-0
- Location: Montgomery and Chester Counties, PA
About this Project
This project involves reconstructing 6.1 miles of roadway and 15 bridges or overpass structures, several rated Critical/Structurally Deficient.
AEG performs Phase I/II/III Environmental Site Assessments (ESAs); hazardous waste investigations; wetland identification and delineation; Level 2 CEEs for NEPA clearance; and public involvement. The Phase III ESA involved a joint geotechnical and environmental drilling program to show characterized impacted soils. Data collected from borings was used to determine material structural characteristics and potential contaminant levels, ensure worker safety, and provide information to assess material handling and disposal alternatives, requirements, and costs. AEG developed a GIS database showing three-dimensional graphics of contaminant zones and geotechnically unsuitable material in cross-section and profile views.
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. At one of the river crossings, AEG evaluated using wick drains (as opposed to over-excavation and replacement) to minimize settlement impacts while reducing project costs by $200,000.00. We also significantly reduced project costs by performing multiple slope stability analyses of the existing steep slopes along the alignment to eliminate the need for constructing approximately 1,000 linear feet of retaining wall.
AEG’s Right-of-Way and survey services included locating available property corners in areas of planned Right-of-Way take and performing supplemental field surveys to locate unmapped features using survey-quality GPS receivers and modern total-station instruments equipped with electronic data collectors. AEG was also responsible for utility location, obtaining existing bridge horizontal and vertical clearances, and surveying underwater areas of stream crossings.