BUNKER HILL CERCLA SITE PROJECT - KELLOGG, ID


TerraGraphics has provided technical oversight assistance for the Bunker Hill Superfund Site (BHSS) Remedial Design/Remedial Action (RD/RA) and the Coeur d'Alene Basin Remedial Investigation/Feasibility Study (RI/FS). The majority of work was conducted with USEPA funding under Cooperative Agreement with the State of Idaho. The BHSS encompasses approximately 21 square miles in the Silver Valley of northern Idaho and includes a 365-acre abandoned lead/zinc mining and smelting industrial complex and numerous confined and unconfined waste deposits. Significant RD/RA included remediation of approximately 1200 residential/commercial properties by the site PRPs, demolition of the smelter complex, excavation of two million tons of contaminated unconfined tailings, development of more than 100 acres of on-site repositories, restoration of 200 acres of river floodplain and 1200 acres of barren hillsides.

Remedial design, remedial action and oversight task orders completed during TerraGraphics’ 1996-2001 BHSS tenure included Project Planning and Support, Community Involvement, Field Investigation/Data Acquisition, Sampling and Sample Analysis, Analytical Support and Data Validation, Data Evaluation, Characterization and Disposal of Field Generated Waste, Treatability Study/Pilot Testing, Risk Assessment, EE/CA Review and Development, Removal Oversight, Remedial and Long-term Response Action Oversight, O&M Plan Development and Oversight, Technical Meeting Support, Preliminary Design and Intermediate Design, Reuse Planning, Post Remedial Design Support, Five-year Review Report, Document Review, ARAR Review, Site Visit/Interviews, Site Inspection/Technology Review.

Engineering/Oversight Services: In cooperation with USEPA Region X, TerraGraphics developed the investigative and 30% engineering design reports for State?lead projects, and then worked with EPA's RAC contractor to complete the construction package for the USACE. Principal State lead projects were the $35M Smelterville Flats reconstruction and $12M Central Impoundment Area (CIA) closure. We conducted State technical review for EPA-lead cleanup activities including the $31M Industrial Complex demolition/closure and $7M Government Gulch cleanup. We represented the State in developing the BHSS cost tracking program to assess project funding, construction efficiency, and State match obligations and provided engineering and technical support during construction.

Scientific and Technical Services: TerraGraphics developed the sampling protocols, health and safety plans, and QA/QC procedures and collected the majority of samples used in the BHSS RI/FS and Five Year Review for the Populated Areas of the BHSS. In addition to routine monitoring and verification sampling, we conducted extensive sampling programs on residential soils, hillsides, ROWs, and house dust. We conducted pilot field experiments testing the success of various soil amendments on heavy metal sequestration and the subsequent limitation of biological availability, and bench-scale testing and design of passive water treatment facilities. We provided technical and strategic planning services for O&M, Land Transfer and Waste Management activities at the BHSS, including extensive GIS mapping of city and county infrastructure and Site remedial areas and components requiring O&M. We developed a site-wide standard format for O&M manuals identifying maintenance and inspection tasks, level of effort, manpower and equipment requirements and inspection intervals. Land transfer activities included maps of property ownership, land use, and local planning and zoning to facilitate transfer of remediated properties and O&M responsibilities from EPA to the State. Waste Management activities included review of historical disposal practices and regulatory guidelines, field survey to determine in-place disposal volumes, estimation of future waste types, volumes, and identification of potential disposal locations.