Bay Shore Remediation

Location:
Bay Shore, NY

Client:
National Grid

Contract Value:
$5 Million

Project Dates:
2011 to 2012

Summary
  • Asphalt Paving
  • Low Vibration Applications
  • Steel Sheet Piling
  • Remediation
  • Transportation and Disposal of Contaminated Soils

PROJECT OVERVIEW

The major scope of work includes the installation of support of excavation, excavation, load out and disposal of MGP impacted soil and site restoration. The Support excavation needed to be designed to support excavation adjacent to an existing historic building and to excavate inside of a slide rail shoring system for the remainder of the site. Project required the erection and use of a negative pressure enclosure, drainage installation, and installation and restoration of an existing Long Island Rail Road parking lot.

WHAT MADE THIS JOB COMPLEX

Posillico excavated adjacent to an existing historic building and the Long Island Railroad tracks and active underground utilities, all of which were done while excavating in ground water. This required strict tolerances for maximum vibration levels during the installation of the support of excavation. Close proximity of residential houses and active businesses made odor control while excavating the contaminated soil a priority.

HOW POSILLICO SOLVED IT

Posillico utilized a zero vibration sheet pile hammer for the installation of the sheet piles while implementing a unique SOE design to minimize settlement during excavation. Odors were controlled by spraying an odor controlling foam and stockpiling all soil within the negative pressure enclosure. Excavation in the ground water, without being able to dewater, was accomplished by excavating in discrete cells within the slide rail boxes and SOE.

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