YU & Associates (YU) was retained by HNTB Corporation to provide comprehensive environmental and geotechnical services for the RK-93 project as an enabling project for the Manhattan Toll Plaza reconstruction. The scope included demolition of the existing Queens-Randall's (QR) ramp and construction of new ramps to Randall's Island, along with new pedestrian ramps to Bronx and Manhattan.
YU provided geotechnical inspection services for 42 geotechnical borings and 19 percolation test borings, including preparation of boring logs in gINT, percolation test logs, well logs, rock core photologs and a comprehensive Geotechnical Data Report (GDR). The team coordinated and managed laboratory testing assignments, sample delivery logistics, and subcontractor oversight to ensure timely and accurate data collection throughout the investigation phase.
YU performed a Limited Phase II Environmental Site Investigation to determine soil and groundwater contamination levels for proper removal and disposal methods during construction. YU prepared a soil sampling plan and a waste management plan to be used as the guidance for soil characterization of the soil materials and solid waste generated from the proposed construction activities. YU also reviewed the construction submittals and responded to RFIs from the Contractor.
YU also conducted hazardous materials investigation on bridge structures slated for demolition, including the Bronx Pedestrian Ramp, Manhattan North and South Pedestrian Ramps, and Queens-Randall's Ramp. The investigation identified potential Asbestos Containing Materials (ACM), Lead-Based Paint (LBP), Polychlorinated Biphenyls (PCBs), and other regulated materials through comprehensive sampling and laboratory analysis. Suspect hazardous material samples were collected throughout proposed work areas using man-lifts and appropriate lane closures for safety.
Both ACM and LBP were confirmed through laboratory analysis. YU delivered comprehensive ACM abatement recommendations and cost estimates for ACM, Hazardous Waste, and Universal Waste remediation. The environmental engineering design, contaminant analysis, and hazardous materials assessment enabled timely completion of the project's investigative phase while ensuring compliance with all applicable federal, state, and local regulations.
