The Delco Centre is a 46-acre retail development. The development consists of 397,125 SF of retail and restaurant space and includes such tenants as Lowe’s, Giant supermarket, TJ Maxx, Bob Evans and Chili’s. To revitalize the site, Langan provided geotechnical, site/civil and infrastructure engineering on the substantially vacant older retail center that was partially undeveloped and adjacent to a limestone rock quarry. Existing topography had a change in grade of over 60 feet through the site. As a result, extensive geotechnical investigations were performed including a proof drilling and grouting program design along with rock excavations. In addition, the site design included 20 foot two-tiered retaining walls.