Arrowhead’s environmental and remedial construction capabilities are well proven throughout the continental U.S. Arrowhead has served all DOD commands and their associated construction activities’s (NAVFAC, AFCEE, USACE,) at numerous environmentally impaired sites. Under EPA programs, Arrowhead has also implemented dozens of design-build remedies at several of the Nation’s most challenging Superfund Sites.

Representative experience includes removal actions; in-situ soil treatment; groundwater treatment plant design and construction; biological treatment applications; facility demolition; landfill construction, repair and closure; radiological waste removal, decontamination and transportation; residential removal actions; and various on-site/off-site disposal services.

USS Lead Superfund Site - East Chicago, Indiana

Arrowhead was awarded a firm fixed price contract to implement a residential removal action at the USS Lead Superfund site located in East Chicago, Indiana. The site includes part of the former USS Lead industrial facility along with nearby commercial, municipal and residential areas. Listed on the National Priorities List in 2009, the site’s primary contaminants of concern are lead and arsenic, and the remediation of site contamination is one of EPA Region 5’s highest priorities. Through a competitive procurement, Arrowhead was selected by the EPA Remedial Action Contractor, CH2M, to perform the project.

The site is divided into three zones: a residential neighborhood located between the Elgin, Joliet & Eastern Railway Line on the west, Parrish Avenue on the east, East 149th Place to the south and East Chicago Avenue to the north is designated as Zone 3. EPA Region 5 had committed to the community a cleanup of 120 properties in Zone 3.

Approximately 12,000 cubic yards of soil required removal and off-site disposal from the various properties. Each of the properties will also be restored to better than original condition following remediation.

Arrowhead worked closely with local property owners and coordinated a daily workforce of over 45 employees and specialty subcontractors.

Former Atlas "E" Site 11 Groundwater Remediation - Nunn, Weld County, Colorado

Under a multi-year ID/IQ Environmental Services Contract, Arrowhead was awarded a competitive Task Order by USACE Omaha District for completion of remedial services which will result in a Remedy Complete status at a former nuclear missile silo located in Northeastern Colorado. The property was operated by the US Air Force as an Atlas Missile site between 1960 and 1965, during this time operational use of TCE resulted in contamination of a shallow aquifer. The property consists of approximately 27 acres, is privately owned and is currently operated as a light industrial manufacturing facility. The remedy proposed by Arrowhead was a multi-phased approach comprising in-situ chemical oxidation (ISCO) treatment (sodium permanganate as the selected oxidant) in the areas of highest TCE contamination and groundwater extraction, liquid phase granular carbon treatment, and re-injection in areas containing low levels of TCE. This approach provided two distinct advantages, the highest concentrations of TCE were directly treated by ISCO treatment while groundwater extraction produced increased hydraulic gradients decreasing the travel time necessary for oxidant to migrate through the saturated interval. Arrowhead was responsible for a wide range of tasks as part of this contract including: development of site-specific project plans (QAPP, SAP, HASP, Work Plans), completion of aquifer testing, data gap sampling, bench and pilot scale studies, community meetings, development of the Proposed Plan, preparation of the Decision Document, quarterly groundwater sampling, and construction of a full scale ISCO injection and groundwater extraction system. Arrowhead completed data collection and pilot testing to determine hydrologic parameters such as hydraulic conductivity, porosity and transmissivity (as collected in aquifer pump tests), and geochemical characteristics of the aquifer including the natural oxidant demand (NOD).

Crossley Farms Superfund Site, Groundwater Treatment Plant – Barto, Pennsylvania

Arrowhead was selected for the design-build construction of a new groundwater treatment plant located approximately 45 miles Northeast of Philadelphia. Contract value was approximately $7M and was awarded at 30% design level. Construction of the plant was funded by the U.S. EPA Region III to treat heavily-contaminated groundwater at the Crossley Farms National Priorities List Superfund Site. The project location was a former unregulated chemical dumping site located in a rurally populated area.

Several elements of construction such as building foundations and pipeline trenching were commenced prior to final design documents to expedite the schedule. The most prominent features of the project included the installation of five groundwater extraction wells, trenching and installation over 15K linear feet of multiple diameter HDPE piping runs, and construction of the groundwater treatment plant which was housed in a 140ft x 75ft pre-engineered metal building. The geography of the project site was extremely hilly, with many severe elevation changes. Site preparation activities for this facility required a combination of importing and moving 10,000 CY of material, in order to bring the location to the proper grade. The site also required installing the full complement new utilities.

The plant received contaminated groundwater from five, 150 feet deep extraction wells, located approximately one mile from the plant. Following rigorous treatment in the plant using a variety of technologies (air strippers, granular activated carbon, bag filters), the water was then discharged via pipeline through two water outfalls. Discharge Area 1 consists of a subsurface infiltration gallery and a surface discharge to a small creek tributary. Discharge Area 2 utilized a 3-acre wetland and a detention pond that over flows into an adjacent creek. Because injection wells may be installed in the future, accommodations were made at the discharge/infiltration areas to accommodate additional injection wells.

Ripon Manufactured Gas Plant Site, Ripon, Wisconsin

Arrowhead was awarded a competitively bid $1.6M prime contract to conduct a coal tar-contaminated sediment removal action at a former MGP Plant site (now a city park) owned by a large Midwestern Utility Company. Key elements of the work scope included utilizing a water based drill rig to characterize contaminated sediments, mechanically dredging over 2,000 cubic yards of heavily contaminated sediments, stabilizing the sediments prior to disposal, and installation of a State approved subaqueous cap.

Site support activities included: establishing site security measures/fencing; providing temporary offices, utilities, and restroom facilities; and establishing staging areas, air monitoring stations, and site ingress & egress provisions. Subsequent dredging operations began based on the information gathered during the preliminary investigation. Arrowhead crews utilized a spud barge with a long-stick excavator to conduct sediment dredging. An initial 2-feet of sediments were removed from prescribed areas of the pond. An additional 2-feet of sediments were surgically removed from the center area of the pond. All dredging was directed by GPS controlled equipment. Dredged sediments were loaded on to waiting haul-barges for transport to shore. Skid loaders transferred the contaminated sediments to a staging area for calciment stabilization/mixing and transfer to tri-axle dump trucks destined for transport to the landfill. The subaqueous cap was installed above the excavated areas of the pond. As per the specifications and Wisconsin DNR, the subaqueous cap was designed to be comprised of a vent layer overlain by a geosynthetic liner. The entire cap system was designed and installed to passively vent any vapors to the shore side for atmospheric dissipation.

Substantial completion of the project was achieved in January of 2014 with demobilization conducted later, due to subzero temperatures. Final site restoration was completed in April 2014. The work was conducted with little or no impact to the park, the shoreline, or the surrounding community.

Lawrence Aviation Industries Superfund Site Port Jefferson Station, New York

Arrowhead was selected to implement a $5.9M remedial action at the Lawrence Aviation Industries (LAI) Superfund Site, located in Port Jefferson Station, New York. The site encompasses 126 acres and consists of the LAI facility and the LAI Outlaying Parcels. Historic disposal practices at the LAI facility resulted in in a variety of contaminant releases including TCS, PCE, PCB’s acid wastes, oils, sludge, metals, and plant wastes. Arrowhead served as the design-build construction subcontractor for the design, construction and operation & maintenance of a groundwater treatment system (GWTS) and an in-situ chemical oxidation system. The primary objectives of the remedial action were: 1) to maintain hydraulic plume control of the source area by extracting and treating contaminated groundwater; 2) remediating the source area with the highest TCE concentrations through source removal excavation in concert with in-situ chemical oxidation into the groundwater plume to reduce contaminant mass.

Field activities associated with the GWTS included construction of access roads and security fencing, drilling and installation of the two extraction and five effluent injection wells, installation of 2,600 LF of influent and effluent yard piping, erection of a 1500 SF pre-engineered metals building, installation and hookup of process equipment, instrumentation, and controls, and field startup. Process equipment included a low-profile air stripper (1,300 scfm, 200 gpm), bag filter complex, and vapor-phase granular activated carbon (GAC). The treatment system is operated by a SCADA system that permits remote operations monitoring and adjustments.

Arkema Chemical Superfund Site, Portland, Oregon

Arrowhead was selected to implement a $5.9M design-build groundwater remedial action at the Arkema Chemical Superfund Site located in Portland, OR. The project included remedial system final design, construction, and operation & maintenance of a remediation system for groundwater source control that prevents offsite migration of site related contaminants. The site contains a wide variety of contaminants related to the former chemical manufacturing process, including perchlorate, pesticides (DDE, DDD, and DDT), metals, volatile organic compounds (VOCs), and semi-volatile organic compounds (SVOCs). Primary components of the remediation system include a containment barrier wall that physically separates the affected upland portions and in-water portions of the site; a network of extraction wells to provide hydraulic control that prevents groundwater containing unacceptable concentrations of the site related contaminants from moving around, over, or under the containment barrier wall; and, management of treated groundwater from the ex situ treatment system, with treated effluent discharged to the Willamette River under a National Pollutant Discharge Elimination System (NPDES) Permit.

The groundwater extraction system is comprised of a network of 22 extraction wells designed to remove groundwater containing the site-related contaminants from three different zones of the aquifer. The extraction wells and wellhead are each fitted with a VFD controlled submersible pump, level transducer, and magnetic flow meter. A network of 36 piezometers fitted with level transducers was also installed to monitor and facilitate control of the hydraulic conditions.