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PS-1R is a two story structure with exterior, load bearing brick walls and a full basement. The interior of the building includes isolated columns and timber joist construction. The floors of the 1st and 2nd stories of the building have deflected down toward the northern and southern exterior walls of the building.

YU & Associates, Inc. (YU) was retained by New York School Construction Authority (NYCSCA) to conduct a forensic geotechnical evaluation and supplemental engineering analyses. This included a subsurface investigation with soil boring and test pit excavation as well as site reconnaissance to observe and document key conditions possibly related to geotechnical concerns. YU visually examined and classified soil samples, recorded relevant information and engineering data on boring and test pit logs, and measured drilling fluid and/or groundwater depths as appropriate.

Additionally, YU performed a laboratory program which included Physical/Index Tests and Consolidation Tests. The Physical/Index Tests were performed on selected samples and examined features such as moisture content, grain size, Atterberg Limits and/or unit weight. Where relatively soft and fine grained soils were encountered, a relatively undisturbed sample was obtained in the field and subjected to Consolidation Testing in the lab.
Recommendations for the mitigation of the interior floors were included as part of YU’s geotechnical report.


Staten Island,
New York


  • Geologic Information and Concept Plan Review
  • Site Reconnaissance
  • Soil Probe/Boring and Test Pit Inspection
  • Physical/Index and Consolidation Testing
  • Geotechnical Evaluation and Report
  • Forensic Geotechnical Evaluation
New York City School Construction Authority
New York City School Construction Authority