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Investigation & Remediation

Terranext has extensive in-house technical expertise with respect to soil and groundwater investigation and remediation of hazardous waste and petroleum contaminated sites. Our assessment and investigation methods cover the entire range of soil and groundwater studies including soil borings, monitoring well installation and sampling, aquifer pump tests, soil gas surveys, direct push technology and others.

Our remediation services include alternative approaches to active site remediation including natural attenuation, site specific cleanup standards based on proximity of groundwater and surface water receptors, and other risk based corrective action approaches.

Our traditional services conform to regulatory driven approaches such as CERCLA removal actions, RCRA Interim Measures, RCRA closures and Brownfields support. We have the proven ability to develop creative and cost effective solutions utilizing either a simple solution approach or the very latest technology for our clients.

RECENT PROJECTS

 

Brownfield Targeted Assessments

Kansas Dept of Health &

Environment and

Missouri Dept of Natural Resources

Brownfield Targeted Assessments (BTAs) involve research and evaluation of existing and historical land use at brownfield properties and adjoining properties so uncertainties associated with environmental impacts can be minimized and/or identified prior to redevelopment and reuse of brownfield properties. In addition, if warranted, BTAs can include field screening and/or collection of soil, sediment, ground water, and/or surface water samples to further evaluate potential adverse impacts to brownfield properties.

Terranext has successfully completed over 45 BTAs at properties ranging from former mills, abandoned railroad corridors, shooting ranges, oil and gas exploration fields, bulk storage facilities and grain elevator complexes to train depots, former locomotive roundhouses, museums, industrial parks, agrichemical plants, service stations, waste lagoons, livestock facilities, and wood processing plants. Experience on brownfield projects has resulted in the redevelopment of brownfield properties by developers and municipalities for public and private use, including riverfront recreational walking trails and parks, museums, city parks for recreation, a theatre complex, a sports arena, a business park, and a wildlife refuge.

                                 
Kansas Dept of Health & Environment

Topeka, Kansas

Terranext has been selected on four Time and Materials contracts with KDHE, and has worked closely with KDHE staff during the investigation, feasibility and design phase of environmental projects to ensure KDHE's concerns are addressed while developing cost effective solutions to meet specific project goals and strategies. Terranext has evaluated the feasibility of ground water extraction and treatment systems, deep well injection applicability and efficacy of soil and ground water treatment systems, and designed and installed municipal water line extensions to provide businesses and residents with drinking water. Selected project work for KDHE includes the following:

  • Contamination Assessment and Corrective Action, Yoder, Kansas Identify the source and extent of PCE, TCE and CCL4 impacts to ground water and private water wells.
  • Water Line Extension and Connection, Colby, Kansas Design and install municipal water line extension for connection of private and industrial water supply wells impacted by hexavalent chromium.
  • Phase I & Phase 2 Brownfield Targeted Assessments (BTAs), Various Sites throughout Kansas Initial screening evaluations to determine current and historical environmental conditions at the BTA properties followed by subsurface investigations to identify potential chemicals of concern and potential migration pathways.

Project Value is $2,000,000 annually.

Early Response Action
Arizona Department of

Environmental Quality
Phoenix, Arizona



Terranext was retained by ADEQ to perform an Early Response Action (ERA) at the East Washington Fluff WQARF Registry site. The objec
tive of the ERA was to design and construct an engineered barrier to eliminate the direct exposure pathway between the contaminated media and human population. The constructed barrier consists of a ten-inch thick compacted soil cap. The following was performed by Terranext prior to cap construction:

  • Human health risk assessment by Terranext. Perimeter dust monitoring was performed to confirm that unacceptable levels of off-site dust were not generated.
  • Prior to cap construction, 5,900 tons of automobile shredder fluff piles required removal and off-site disposal. The fluff at the site was profiled as a RCRA/TSCA waste based upon PCB and TCLP metals concentrations.
  • Over 800 tons of surficial solid waste was removed from the site.
  • Three USTs were removed from the site.

Sampling of shallow perimeter soils by Terranext identified off-site areas where residential soil remediation levels (SRLs) were exceeded for lead and/or PCBs; almost 600 tons of contaminated soils were disposed. Terranext completed a remedial investigation in the summer of 2002 to identify the areal and vertical extent of contaminated media remaining at the site.  Project value was $2,000,000.

 
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