Dover Municipal Landfill: Construction Assistance/ Preparation of Bid Packages

The Dover Municipal Landfill was open from the 1960s to 1980 and was the disposal site for local municipal and industrial wastes. Impacted ground water migrates from the Landfill toward downgradient receptors, including residential properties and a nearby river. Early response actions included extending potable water to the residents, and initiating a study to delineate the extent of ground water impacts. GeoInsight is the oversight contractor for a Potentially Responsible Party (PRP) Group associated with completing Remedial Design/Remedial Action (RD/RA) activities at the Dover Municipal Landfill Superfund Site in Dover, New Hampshire. GeoInsight has assisted the PRPs through the Superfund process since the mid 1990s. In 2010, the Source Control Remedial Design was finalized and approved by the USEPA that included removal of impacted sediment from a drainage ditch that surrounds the Landfill and construction of a ground water extraction (GWE) system to limit migration of impacted ground water from the Landfill area.

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GeoInsight’s engineering team prepared the design documents and the technical bid specification package that was iteratively developed through 2010 and approved by USEPA, at the 30%, 75%, and 100% completion milestones. During design, GeoInsight evaluated site-specific conditions and technologies to effectively extract ground water. The long-term operation and maintenance requirements to cost effectively keep a remedial system functional was an important part of the design. During this process, the design team evaluated choices for materials and equipment, incorporated flexibility into the design so that future changes or additions to the system could be completed, considered site layout and access, and evaluated the appropriate sequence of construction activities. The technical specification and drawing package provides the information needed by the PRPS to effectively estimate the cost and duration of the construction project. The technical bid package provides the framework for the project contract. Design changes and modifications are typically identified during construction, evaluated by the engineering team, and become incorporated into the final as-built construction plans.

 

The design elements that will facilitate lower cost long term O&M include:

  1. Accessible system components that are located along an access road corridor that allows service trucks and support vehicles direct access to components;
  2. A system layout and infrastructure that allows for the addition of extraction wells, if needed in the future;
  3. A surface mounted pumping approach that will extend the life of extraction wells by minimizing clogging;
  4. Electronic monitoring devices that record water levels and flow rates, reducing manual labor requirements; and
  5. Remote monitoring capabilities that allow the operator to log-on to the system from anywhere to check status and adjust system operation.

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Relevant Tags

  • Remediation
  • Construction
  • Preparation of Bid Packages
  • Landfill
  • O&M