Remediation Construction

Proven Experience

WESTON can solve your toughest challenges with more than 40 years of experience in construction remediation.

U.S. Patent and Trademark Office (USPTO), Alexandria, Virginia. WESTON excavated, transported, and disposed of 730,000 tons of soils contaminated with PCBs, hydrocarbons, and heavy-metals to support LCOR Alexandria, LLC’s $885 million USPTO headquarters development project at an impaired property in downtown Alexandria. WESTON expedited the $25.5 million remediation by developing a 3-dimensional map divided into 387 cells of distinct contamination concentrations, enabling us to plan and execute an efficient removal and disposal program.

At peak production, WESTON managed four excavation crews to ship 350 to 500 truckloads (roughly 7,000 to 11,000 tons) of soil per day to seven disposal facilities. To manage the volume of material shipped, WESTON paired our automated manifest and load tracking system, TruckFast^SM, with a modular board-road traffic control system. These allowed us to re-route site traffic to address daily work conditions and streamline the loading and manifest process. WESTON also used our MonitorFast^SM technology to ensure site activities did not adversely impact nearby residents and businesses. These combined efficiencies enabled the developer to begin site construction 5 months ahead of schedule.

Chase Brass Removal Action, Waterbury, Connecticut. Under our EPA Region I START contract, WESTON designed and constructed an innovative bioengineered habitat to restore a 1,000-foot stretch of the Naugatuck River which had been impacted by years of industrial activity. WESTON worked closely with the Connecticut Department of Environmental Protection and local activist groups at this high visibility site to develop a remedial solution in harmony with the ecosystem and the character of the community.

WESTON utilized natural and vegetative material to stabilize the steep slopes and enhance the riparian and river habitat. WESTON created detailed engineering plans to successfully address significant engineering issues such as drainage channels leading to the site, development of the river bank, and the need to minimize off-site borrow and disposal. Instead of using riprap and rocks, giving the site an industrial look, WESTON placed native plants to stabilize the stream sides and created a pool area and eddies to foster aquatic ecosystems.

Charles George Landfill Groundwater Pre-Treatment System, Tyngsboro, Massachusetts. WESTON designed, constructed, and operated an innovative 100-gpm pretreatment facility, saving an estimated $5.6 million and earning WESTON’s second federal “Hammer Award” (shared with USACE New England District and EPA Region I). WESTON built the pretreatment plant to address VOCs leaching from a70-acre municipal landfill containing hazardous industrial waste into drinking water wells. WESTON applied a value-engineered approach, constructing a 1.5-mile sewer line extension to discharge pretreated water directly to the municipal sewer, bypassing the need to construct an expensive, full-scale on-site treatment facility to treat elevated concentrations of VOCs, heavy metals, ammonia, THF, and other compounds. This system has discharged over 10 million gallons to the sewer line for final treatment by a Publicly Owned Treatment Works. WESTON assisted with permitting, conservation commission reviews, and utilities coordination to facilitate integrating the new pretreatment process with existing infrastructure to minimize costs and maximize benefit.

At Old O-Field Permeable Infiltration Unit Installation, Aberdeen Proving Ground (APG), MD. WESTON was contracted by USACE Baltimore District to construct a Permeable Infiltration Unit (PIU) at the 4.5-acre Old O-Field High-Hazard landfill at APG. The site holds 35 documented trenches containing Chemical Warfare Munitions (CWM) agents, UXO items, and hazardous waste. WESTON constructed innovative multi-layered PIU cap using state-of-the-art teleoperated heavy equipment. PIU construction, coupled with an existing extraction and treatment system to treat contaminated groundwater, reduced potential white phosphorus ignition by maintaining water saturation levels and provided early warning for potential CWM vapors release. WESTON saved $500,000 and reduced the task schedule by 15%.

Eastland Woolen Mill Superfund Site Remediation, Corinna, ME. WESTON performed CERCLA Removal Action to excavate contaminated soil and sediment from the Eastland Woolen Mill Superfund site. Historic mill manufacturing activities significantly impacted the soil, sediment, and groundwater, requiring large-scale remediation. WESTON demolished five residential and commercial buildings; relocated a historic building; and dammed, diverted, and relocated the East Branch of the Sebasticook River to facilitate the excavation of nearly 105,000 tons of soil and sediments contaminated with chlorinated solvents. WESTON performed a pilot study and full-scale thermal treatment of excavated soils to support EPA objectives at the site and removed the original mill pond’s dam, restoring the river’s free-flowing habitat. WESTON also redirected Corinna’s main road around the excavation and constructed a new wooden bridge across the new river channel, reflecting the town’s renewed character.

Mixed Waste Landfill Consolidation Removal and Capping, Westover ARB, Chicopee, MA. WESTON installed a permanent impermeable landfill cap with a passive venting system on a 13-acre municipal landfill at Westover ARB in Chicopee, MA. This $3.2 million landfill closure project included wetland remediation and required WESTON to remove compressed gas cylinders, asbestos, and 100,000 cy of soil. To construct the landfill cap, WESTON regraded the landfill contours, placed 20,000 cy of material to meet the specified sub-grade, installed the welded liner and 15,000 cy of sand, and placed 30,000 cy of cover materials. Upon cap completion, WESTON planted native plants to stabilize the site. Within the first few days of construction, WESTON encountered a 250-lb training bomb. WESTON mobilized our in-house UXO specialists to the site within 24 hours of the discovery to address the bomb and survey the site for other high-hazard materials. Despite this event, WESTON completed the project on schedule and $200,000 under budget, prompting the USACE New England District to issue WESTON an “Outstanding” performance rating.

Campbell Shipyard, San Diego, California. WESTON worked with Campbell Industries Marine Construction and Design Company to address a Cleanup and Abatement order issued by San Diego Regional Water Quality Control Board. Located between San Diego Convention Center and San Diego Bay, the 11-acre former Campbell Shipyard site had been impacted by over 100 years of industrial activities, including a Petroleum Product Tank Farm and Off-Site Gas Manufacturing Plant.
Contamination (metals, gasoline and diesel fuels, and PAH compounds), threatened the shallow, tidally-influenced groundwater table. WESTON worked with San Diego Unified Port District to excavate 33,000 cy of contaminated soil above and below groundwater level, stabilize and solidify material on-site to meet specified criteria (<1,000 TPH for leachate), and backfill the site for future development. WESTON restored this formerly impaired property’s economic and development potential, helping the client achieve environmental regulatory compliance and reduce liability.