ABOUT NEWS CAREERS CONTACT FTP EMPLOYEE PORTAL GENERAL CONSTRUCTION ENVIRONMENTAL SERVICES CIVIL CONSTRUCTION HOMELAND SECURITY ENVIRONMENTAL SERVICES 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. More 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). More 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. 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. More 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. More 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. More 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. More © 2018 Arrowhead Contracting, Inc. New Hire Portal and Employee Portal.