State & Local Government

Remediation Experience

WESTON is dedicated to developing and implementing solutions that safely and cost-effectively address complex remediation challenges, provide economic and environmental benefits, and address public concerns.

Testing and Environmental Remediation Services, Southeastern Pennsylvania Transportation Authority (SEPTA), Philadelphia, PA. WESTON has been awarded three consecutive 3-year contracts to provide environmental consulting and remediation services to SEPTA.

WESTON has performed numerous task orders—design, installation, and operations support of groundwater treatment/free product recovery systems; asbestos/lead paint surveys and inspections during mitigation activities; environmental decommissioning of a former SEPTA bus maintenance facility including UST removal and closure, and draining and cleanup of hydraulic oil systems, tanks, and maintenance pits.

Site Investigation and Remediation, Kettler Property Site, New Hampshire Department of Environmental Services, Sullivan, NH. WESTON was retained to assess potential environmental impacts resulting from the arson destruction of a commercial vehicle restoration business, and recommend and implement corrective action to restore the site for future use. In 1997, the owner of a military vehicle restoration business reportedly set fire to the on-site buildings, damaged an on-site transformer, and poured paint and oils into the on-site drinking water well. Sampling of the well confirmed there were concentrations of substances exceeding Ambient Groundwater Quality Standards (AGQS), prompting the New Hampshire Department of Environmental Services (NHDES) to authorize follow-up investigations by WESTON.

WESTON completed a site walkover, conducted interviews, records research and prepared a work scope, completed sampling to confirm the nature and extent of contamination, and prepared a report of findings with recommendations for the cleaning and abandonment of the site. WESTON also coordinated with NHDES, the Town, and the bank having ownership interest in the property to remove abandoned vehicles and metal debris prior to remediation, supervised the NHDES remediation contractor, and prepared a Site Remediation Report documenting removal of on-site sources.

Vanek’s EXXON, In-Situ Groundwater Remediation, Texas Commission on Environmental Quality (TCEQ), West McLennan County TX. WESTON was tasked with designing a groundwater cleanup that would allow the TCEQ’s State-Lead LPST program to stop operation of a dual-phase vapor extraction system at a site, thus lowering operating expenses. In 1996, petroleum hydrocarbon vapors and phase separated hydrocarbons (PSH) were detected in the sump room of a bank located to the north of Vanek’s Exxon, a petroleum products retailer and distribution facility. Since 1996, site investigation activities and remediation activities have been conducted at the site to eliminate the hazards posed by the vapors found in the bank, including installation of a recovery trench and operation of a dual phase vapor extraction system. The groundwater contamination was persistent, and the client was paying ongoing operation and maintenance costs for the dual phase vapor extraction system at the bank.

WESTON evaluated the historical data from the previous site investigation at the site, and conducted quarterly groundwater monitoring. Based on the data collected, WESTON recommended enhanced bioremediation of the plume. WESTON prepared a Corrective Action Plan (CAP) including the plans and specifications for the remediation action. WESTON implemented the TCEQ-approved CAP, including the installation of 36 borings, placement of an oxygen-releasing compound (ORC) into the affected groundwater zone and confirmation groundwater sampling using low-flow micro-purging equipment. WESTON also coordinated with the Texas Department of Transportation (TXDOT) for the right-of-way access and implementation of a traffic control plan for the injection of ORC. Scope included repaving of roadway, temporary storage of 33 drums, and additional groundwater monitoring to evaluate effectiveness.

Jensen Drive Scrap State Superfund Site, Texas Commission on Environmental Quality (TCEQ), Houston, TX. WESTON was retained to complete the feasibility study process and prepare the remedial design for this inactive metal salvage facility. Contaminants of concern at the Jensen site were PCBs, lead and arsenic. The purpose of this feasibility study was to apply the TNRCC’s presumptive remedies to the contaminated soil at the site, pursuant to the requirements of 30 TAC Section 335.348.

The PRD evaluated the historical use of the site and the surrounding areas to determine that future land use would be non-residential. WESTON evaluated existing analytical data and a baseline risk assessment to determine appropriate cleanup goals and limits of contaminated soils. Based on this evaluation it was determined that approximately 5,200 cubic yards of soil (in-place) exceeded the cleanup goals and required remediation WESTON evaluated four remdial options. Each of the options was scored using the criteria in the TNRCC’s Presumptive Remedies Guidance Document. Cost estimates were also prepared for each option for relative comparison. Based on this evaluation, containment with consolidation was selected as the remedy for the soils at the Jensen site.

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