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Active Wood Treating Site
North Little Rock, Arkansas
Proposed and negotiated a reduction in the number and frequency (quarterly to semi-annually) of wells monitored. The optimization of related collection and analytical costs resulted in annual savings of approximately $100,000 throughout the life of the client’s monitoring obligation.
Regulatory Agency

Arkansas Department of Environmental Quality
US EPA Region VI/Federal RCR


Creosote (DNAPL), PAHs, Pentachlorophenol and BTEX

Project Description

The site is an active wood treatment facility located in North Little Rock, Arkansas which has been in operation since 1907. The site covers approximately 155 acres of generally flat plain that slopes south to the Arkansas River. The plant operations consist primarily of pressure treatment of railroad ties and switch ties; however, the facility can also be used for treating lumber, utility poles and some bridge piling material. Three types of wood-preserving compounds have historically been used at the facility: organic-based creosote, pentachlorophenol, and inorganic salts such as chromated copper.

The implemented groundwater interim measure is an enhanced DNAPL recovery system. Groundwater is re-injected via reinjection wells local to each recovery well. The site is being addressed pursuant to a 3008(h) enforcement order.

Current Activities Performed
  • Weekly measurement and recording of recovery well operational data, inspect DNAPL storage tanks, satellite drum accumulation storage area, and injection wells;
  • Bi-weekly inspections of the closed surface impoundment and gauging of 8 monitoring wells;
  • Monthly cleaning and calibration of the groundwater recovery flow meters;
  • Acid treatment and redevelopment of DNAPL recovery and groundwater reinjection wells as needed basis;
  • Routine maintenance of all groundwater recovery system components;
  • Semi-annual monitoring of 19 wells via Low Flow purging and sampling methods, parameters analyzed include BTEX, SVOCs, total and dissolved metals and monitored natural attenuation parameters;
  • Semi-annual gauging and inspection of 50 monitoring wells;
  • Inspect and maintain closed surface impoundment and site capped areas;
  • Permit compliance activities including onsite review of Manifest’s and LDR’s, SAP, HASP, training records, financial assurance documentation, annual review and updates to the OM&M manual and PPC Plan;
  • Waste management activities including hazardous storage area inspections, preparation of monthly waste inventory report, handling and labeling of waste, schedule and coordinate shipping of waste to disposal facility and recertification of waste profiles.


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