New York State Department of Environmental Conservation, Trimmer Road Landfill

Posted on June 15, 2015

Client: New York State Department of Environmental Conservation
Location: Trimmer Road Landfill Site

Major Components

  •  Work Elements Completed
  •  Remedial Investigation
  •  Feasibility Study
  •  Pre-Design Investigation
  •  Engineering Design Report
  •  Remedial Design and Construction Services

Project Description


The Trimmer Road Landfill is a 40 acre landfill located in the Town of Parma, Monroe County, New York. The landfill was a private disposal facility that accepted municipal and industrial waste between 1952 and 1974. The site is a Class 2 Inactive Hazardous Waste Site.

D&B Engineers and Architects, P.C. was retained by the New York State Department of Environmental Conservation (NYSDEC) to conduct a remedial investigation and feasibility study (RI/FS), remedial design (RD), pre-award services and construction oversight for the Trimmer Road Landfill site.

Site Background

A review of the history of the site is presented below:

  • The landfill received municipal waste from the surrounding towns primarily within Monroe County as well as industrial waste from local industries. There are reports that drums of waste material were disposed of at the site but these reports have not been confirmed.
  • The landfill was in violation of NYSDEC regulations for sanitary landfills for much of the time it operated. Violations were also cited by the Monroe County Health Department.
  • Groundwater samples collected as part of a Phase II Investigation performed at the site in 1986 indicated elevated levels of volatile organic compounds (VOCs).
  • In 1999, D&B was issued a work assignment to conduct a remedial investigation/feasibility study at the site.

Remedial Investigation


Remedial investigation activities were undertaken at the site between October 1999 and January 2001. The purpose of the remedial investigation was to define the nature and extent of contamination resulting from previous activities at the site. A summary of the sampling activities is presented below.

Field Work

As part of the field work for the remedial investigation a geophysical survey was conducted to identify any off-site leachate migration as well as the locations of possible buried drums. In addition, a landfill gas survey was completed to evaluate the potential for landfill gas generation and identify possible contaminant hot spots. Test pits were excavated on and adjacent to the landfill to determine the vertical and horizontal extent of waste, thickness of soil cover and the presence or absence of waste off-site and to identify the shallow stratigraphy of the site. Soil borings and monitoring wells were installed for analysis of soil and groundwater. Surface water, sediment and leachate samples were collected to determine levels of contamination in the pond. Private wells within the vicinity of the site were also sampled as part of the remedial investigation.

The remedial investigation also included the development of a base map and implementation of a Health and Safety Plan (HASP) and Quality Assurance/Quality Control (QA/QC) Program. The base map for the site was compiled from aerial photography and an on-site ground control survey. Site features included roads, an on-site pond and site fencing.

The site-specific HASP was prepared consistent with the requirements of OSHA with respect to the field work conducted. The HASP included site-specific health and safety information and provided for worker and community protection. The site-specific QA/QC Plan was designed to maximize the quality and validity of the data collected during the field investigation.

The results of the remedial investigation indicated elevated concentrations of volatile organic compounds (VOCs) and metals in shallow overburden groundwater. Low levels of VOCs were also detected in leachate samples. Several metals were detected at elevated levels in the leachate samples as well as sediment samples collected from the on-site pond.

Feasibility Study

Based on the results of the remedial investigation, a feasibility study was prepared in accordance with NYSDEC guidance. Applicable remedial alternatives were evaluated for protection of human health and the environment, compliance with standards, effectiveness of the remedy, implementability and cost. Based on the results of the feasibility study, NYSDEC prepared a Record of Decision presenting the following remedy for the site.

  • Construction of an evapotranspiration cap consisting of an enhanced soil cover planted with selected vegetation
  • Installation of a phytoremediation buffer to address shallow groundwater contamination
  • A long-term groundwater monitoring program

Pre-Design Investigation

Pre-design investigation activities were conducted by D&B to provide site specific information to evaluate the extent of site groundwater contamination and to collect information required for the design of the selected remedial alternative. The pre-design investigation included the following:

  • Eight test pits were excavated to determine the thickness of soil cover and to identify the shallow soil stratigraphy in the area of the proposed alternative;
  • Four new groundwater monitoring wells were installed; and
  • Ten groundwater samples were collected from existing and newly installed wells.

The results of the pre-design investigation did not indicate any specific limitations to the technologies identified in the Record of Decision for remediation of groundwater at the site.

Remedial Design

Design activities for the Trimmer Road Landfill initially anticipated design of an evapotranspiration cover pilot system that would cap a portion of the waste. However, due to the results of the groundwater monitoring program NYSDEC made a decision to reduce the scope of the design to only include the installation of the groundwater phytoremediation buffers. During the design process, D&B was responsible for the following:

  • Preparation of an Engineering Design Report which included engineering calculations and other related technical supporting documentation utilized to prepare the detailed plans and specifications suitable for public bidding of the construction contract;
  • Preparation of Contract Documents, inclusive of technical specifications and drawings for the remedial construction of evapotranspiration cover test plots and phytoremediation buffer; and
  • Preparation of a detailed construction cost estimate for implementation of the proposed remedy.

Pre-Award Services


As part of this project, D&B’s responsibilities included the following pre-award services in support of the competitive bidding of the remedial construction:

  • Attend a pre-bid conference and site walkover to review important aspects of the project with all prospective bidders;
  • Prepare written responses to questions raised at the pre-bid conference and any necessary addenda to Contract Documents for timely submittal to all prospective bidders;
  • Complete a technical evaluation of the bids received to determine apparent lowest responsible bidder for the construction contract; and
  • Review technical qualifications of the lowest responsible bidder and provide recommendations regarding award of the construction contract.

Construction Oversight

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

  • Coordination of a pre-construction meeting to initiate the construction phase of the project. The 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, including, but not limited to, the following: Work Plan, QA/QC Plan, Storm Water Management Plan, Shop Drawings for fencing, and certificates of materials compliance;
  • Full-time oversight of all work performed at the site and coordination of and attendance at the weekly project progress meetings with the Contractor, applicable Subcontractors and the NYSDEC;
  • Preparation of complete and detailed records and reports related to the fieldwork activities, which include the preparation of daily field activity reports and a photo log;
  • 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; and
  • Preparation of a final remediation report to summarize the work performed, describe all variations from the Contract Documents, and provide “as-built” drawings, construction observation records and confirmatory sampling results.

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