New York State Department Of Environmental Conservation, Liberty Industrial Finishing Site

Posted on June 11, 2015

Client: New York State Department Of Environmental Conservation
Location: Liberty Industrial Finishing Site
D&B Project Manager: Maria D. Wright

Major Components

  • Remedial Investigation
  • Feasibility Study
  • Remedial Design
  • Remedial Construction Oversight

Project Description


The Liberty Industrial Finishing Site was a metal finishing facility engaged in plating and non-destructive testing of parts and components used primarily in the aircraft industry. The facility operated from approximately 1978 through 1997. It is a 3.9-acre Class II Inactive Hazardous Waste Disposal Site located in the Hamlet of Brentwood, Town of Islip, Suffolk County, New York.

D&B Engineers and Architects, P.C. was retained by the New York State Department of Environmental Conservation (NYSDEC) to undertake a remedial investigation/feasibility study (RI/FS), pre-design investigation (PDI), a comprehensive remedial design including the preparation of contract documents consisting of remedial plans and technical specifications, as well as provide pre-award services and remedial construction oversight at the Liberty Industrial Finishing Site.

Site Background


  • The Liberty Industrial Finishing Site operated from approximately 1978 through 1997. During the operation of the facility, there were several documented discharges of plating waste to storm drains, leaching pools, and on-site surface and subsurface soil. The facility was listed on the NYSDEC Registry and Inactive Hazardous Waste Disposal Sites as a Class IIa site in 1987, and was later reclassified as a Class II site in 1994 as a result of documentation of disposal of hazardous waste at the site.
  • Based on a sampling inspection conducted by the Department in September 1994, the sanitary system and storm water dry well were found to be contaminated with lead, cadmium and chromium.
  • A Phase II Investigation was conducted in 1987 and the results of ground water sampling found two on-site wells with concentrations of chromium above its applicable groundwater standard.
  • An RI was conducted by D&B between September 1997 and November 1998. The results of the RI indicated the following:
    • The sediment in four storm dry wells and one sanitary leaching pool contained semivolatile organic compounds (SVOCs) and metals exceeding New York State standards, criteria, and guidance values (SCGs);
    • Surface and subsurface soil in the vicinity of the six plating waste underground storage tanks (USTs) were contaminated with metals; and
    • Shallow groundwater approximately 500 feet downgradient of the site was contaminated with metals.
  • Interim Remedial Measures (IRMs) were also implemented at the site and included:
    • An emergency removal action by the USEPA at the site to remove waste materials inside the factory building and close the six on-site USTs in place; and
    • The excavation and disposal of contaminated surface soil by the Town of Islip found at the Town of Islip Athletic Field and the Brentwood Water District property.
  • In March 1999, the NYSDEC issued a Record of Decision (ROD) for the Site. The ROD included provision for:
    • Removal of the upper two feet of contaminated soil from the area of the underground plating waste storage tanks and pipe gallery;
    • Removal of soil to a minimum of eight feet below ground surface at the west end of the underground storage tank (UST) pipe gallery;
    • Installation of a nonporous asphalt cap over the UST and pipe gallery area;
    • Excavation and off-site disposal of contaminated sediments/sludge from storm water dry wells and leaching pool;
    • Installation of groundwater monitoring wells and implementation of long-term groundwater monitoring;
    • Remediation of the groundwater contamination plume by natural attenuation; and
    • Implementation of institutional controls and recording of deed restrictions.

Remedial Investigation


As mentioned above, D&B conducted on RI between September 1997 and November 1998. The field investigation work conducted as a part of the RI included: historical information and aerial photography review; public and private water supply well survey; geophysical survey; collection of sediment/sludge samples from storm water wells, sanitary leaching pools and an industrial leaching pool; collection of surface and subsurface soil samples; excavation of test trenches; collection of Geoprobe and monitoring well groundwater samples; installation of new groundwater monitoring wells; monitoring of vapors and gases to determine impacts on ambient air; performance of a wildlife habitat survey; and performance of an exposure assessment to determine impacts on human health.

Feasibility Study

Based on the results from the RI, D&B was tasked with completing an FS. The purpose of the FS was to evaluate the need for corrective action based on the significance of the contamination at the site and to identify, evaluate and ultimately recommend a remedial measure.

Based on the results of the RI, D&B concluded that there was a potential for possible human exposure to contaminants of concern by way of ingestion, inhalation, and/or dermal contact and absorption. None of the contaminated media posed an immediate, acute health hazard; however, due to potential exposure to surface soil with significant exceedance to SCGs, remediation of the soil was recommended to prevent possible chronic exposure.


Three remedial alternatives were evaluated with respect to their present worth, capital cost, annual O&M cost and time to implement. The potential remedies evaluated and recommended for implementation, included the following: no further action; source removal and mitigation and assessment of on-site and off-site groundwater quality; and source removal and mitigation and treatment of contaminated groundwater.

Pre-Design Investigation

Subsurface Soil Delineation

To further delineate the vertical extent of subsurface soil contamination found in a soil boring collected from the west end of the former pipe gallery during the RI, D&B advanced an additional two soil borings within the vicinity of the initial boring. The samples were collected at 4-foot intervals from ground surface to the water table (approximately 40 feet below ground surface).

Subsurface Soil Confirmatory Sampling

Confirmatory SamplinSurface soil samples were collected from 12 locations throughout the Town of Islip Athletic Field to establish baseline conditions prior to remedial construction. Upon completion of the remedial construction, an additional 12 samples were collected and compared to the baseline samples to determine whether there had been any impact to the Athletic Fields as a result of the remedial construction. The sample locations were predetermined to ensure that the samples collected throughout this area sufficiently define the pre- and post-surface soil conditions.

Installation of Groundwater Monitoring Wells


Two groundwater monitoring well clusters were installed, one downgradient of the site and the other on the Brentwood Water District property, to better define the downgradient groundwater contamination and monitor the post remediation natural attenuation of the groundwater. The clusters consisted of one shallow well to approximately 150 feet, near the transition between the Upper Glacial aquifer and the Magothy aquifer, and one deep well to approximately 250 feet within the Magothy aquifer. Both monitoring wells were installed utilizing the mud rotary drilling technique.

Remedial Design

D&B was responsible for the preparation of remedial design contract documents for the excavation and off-site disposal of SVOCs and metals contaminated soil and sediment, in accordance with the ROD issued by the NYSDEC in March 1999. The design used the findings of prior investigation activities to define the extents of the areas to be remediated as part of the proposed remedy.

The design documents were prepared by D&B to specify the following: limits and depths of sediment, soil, concrete and asphalt removal; remediation criteria; endpoint sampling requirements; fill material specifications; asphalt cap specifications; requirements for providing structural reinforcement of the existing building during excavation; specifications for site preparation and restoration and control of noise and odor; as well as submittal requirements, including preparation of a site-specific Health and Safety Plan, Quality Assurance/Quality Control Plan and Sampling and Analysis Plan.

In addition to preparation of the design specification, D&B was also responsible for preparation of the bid schedule and a detailed construction cost estimate. The estimate was prepared on a bid item basis as provided in the bid schedule in the contract documents in order to provide an estimate for each bid item.

Pre-Award Serviceslibertyind5

D&B was responsible for assisting the NYSDEC with pre-award services in conjunction with the competitive bidding of the remedial construction. In this capacity, D&B was responsible for the following:

  • Technical assistance in support of the on-site pre-bid meeting and site walkover. This included presenting a description of the proposed remedial program, responding to questions from bidders, and the preparation of addenda to respond to questions raised at the pre-bid meeting.
  • Assisted the NYSDEC with the bid review process by tabulating the bids and by reviewing the pre-award submittals required from the Contractor by the Contract Documents.
  • Review the apparent low bidder’s 5-day and 14-day submittals for compliance with the requirements of the Contract Documents and provided the NYSDEC with written comments to each submittal provided. Submittals reviewed included: off-site disposal facility permit and approval; Work Plan; Health and Safety Plan; Sampling and Analysis Plan; Contractor’s qualifications package; Preliminary Schedule; and Bid Breakdown.

Construction Oversight

Following the selection of the successful remedial contractor, D&B was responsible for full-time construction oversight for the duration of the project. In this capacity, D&B was responsible for the following:

  • Coordination of a pre-construction meeting to initiate the construction phase of the project. This meeting focused on the Contractor’s schedule, format for shop drawing submissions, payment requisitions, reports and project correspondence, and review of the status of submittals and procedures for communications.
  • Review of shop drawings and submittals for compliance with the requirements of the Contract Documents throughout the duration of the project.
  • Full-time oversight of all work performed at the site and coordination of an attendance at bi-weekly project progress meetings with the Contractor, applicable Subcontractors and the NYSDEC.
  • Review of the construction work for substantial completion, review of as-built drawings and project close-out records, and preparation of a detailed list of items to finish with an estimate of the value of the unfinished items.
  • Preparation of a final remediation report to summarize the work performed, describe all variations from the Contract Documents, and provide “as-built” drawings.

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