The New Jersey Turnpike Authority (NJTA) has embarked on a program to widen the Garden State Parkway (GSP), south from Toms River, mile post (MP) 63.0 to MP 80.8. YU & Associates, Inc. (YU) performed the geotechnical subsurface investigation, and managed the laboratory testing program for four separate contracts. Additionally, YU produced the Geotechnical Engineering Study for the Bay Avenue Bridges. This report furnished the design recommendations for the bridge foundation and support systems and included foundation designs for new toll plaza buildings and tunnel passageways.
The recommended geotechnical parameters were based on the interpretation of data obtained from the geotechnical subsurface investigation and testing program. This program consisted of drilling 12,700 linear feet for over 250 soil borings, the installation piezometers for groundwater monitoring, and management for testing for over 550 laboratory samples. YU implemented database management systems using gINT software, and prepared NJTA customized boring logs and detailed soil profiles for the Bay Avenue Bridge Report. Evaluation and recommendations were made for foundation systems, slabs on-grade, seismic design parameters, retaining walls and utilities. Other geotechnical concerns were addressed including earthwork and subgrade preparation, reuse of on-site excavated material, and excavation support.