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Energy & Utility

NYCDEP - CSO Facilities for Gowanus Canal Bulkhead OH-007

Brooklyn, New York

Project Overview

MFS Consulting Engineers & Surveyor, DPC (MFS) was contracted by Posillico Environmental, Inc. to provide professional geotechnical engineering services for the New York City Department of Environmental Protection (NYCDEP) Combined Sewer Overflow (CSO) Facilities for Gowanus Canal Bulkhead OH-007 project. A proposed bulkhead system comprised of interlocking concrete filled pipe piles at the east and west extents of the bulkhead alignment and sheet piles with micropile supported concrete deadmen at the middle of the bulkhead alignment are to be constructed along the existing shoreline/bulkhead of the Gowanus Canal. In addition, a large CSO tank structure is proposed to be constructed at the project site.

Brooklyn, New York

Project Details

MFS coordinated with our trusted drilling agency to complete a total of five (5) SPT borings and two (2) SCPT borings at the project site. The SPT borings were completed to depths ranging from 127 to 215 feet below grade. Where possible, 10 to 15 linear feet of rock core samples was obtained within the SPT borings

In addition, MFS coordinated with our trusted subcontractor to conduct two (2) SCPT borings at the project site. Each of the SCPT borings were advanced to depths of approximately 75 feet below existing site grade and each boring was conducted with shear wave velocity testing at five (5) foot intervals throughout the boring depth.

During SPT borings, MFS observed the subsurface conditions and generated test boring logs to include soil classifications in accordance with the Unified Soil Classification System and the New York City Building Code, groundwater observations, action of equipment, and other noteworthy observations. The boring logs showed borehole and sample diameters and depths at which drilling, or sampling methods or equipment change. Logs showed total depth of penetration, blow counts, groundwater level, and types of sampling. The drilling equipment make and model, drilling method, date and time drilled, casing, any heaving conditions, loss of circulation, voids, or any other conditions observed during drilling were also noted on the logs. In addition, rock coring logs were prepared to show the jointing and fractures of each rock core sample with percent recovery and percent rock quality designation (RQD).

During SCPT operations, MFS observed the cone tip resistance, friction resistance, friction ratio, soil classification and stratigraphy, seismic shear velocities, and pore water pressure at nearly continuous depth intervals until SCPT termination. The SCPT Data Report prepared by our subcontractor included the above-mentioned parameters, as well as cone diameter, rate of penetration, depth interval of recordings, CPT equipment make and model, and date and time of push operations.

Upon completion of the field subsurface investigation and laboratory testing, MFS prepared a geotechnical data report. The geotechnical data report briefly described the field methods used during the subsurface investigation and included an as-drilled boring location plan, typed boring logs, SCPT data report, and results of the laboratory testing conducted.

Stats

  • Owner:
    NYCDEP

Services Provided

  • MFS provides professional geotechnical engineering services including geotechnical investigation and subsurface exploration, soil engineering services, and permeability testing.