VIASANT LLC
HOFFMAN ESTATES, IL

VIASANT completed a major TSCA source removal project under the authority of a USEPA Region 2 Risk Based Authorization at the former Hatco Chemicals Corporation Site located in Fords, New Jersey. The site was an active chemical manufacturing facility requiring significant coordination between existing facility staff, and the Responsible Parties (RPs) engineer. Given the source removal work occurred adjacent to pipe racks, production buildings and other live plant assets, there was limited room to stockpile waste. VIASANT alleviated the need for excessive stockpiling by conducting a comprehensive in-situ waste classification program ahead of mobilization. The majority of the excavation area required the design and installation of an earth retention system (ERS) which has is being self-installed by VIASANT. The ERS consisted of both temporary and permanent steel sheet piles, with an average length of 25 lf. A total of 500 linear feet of temporary sheet pile was used as temporary structural support on the east and south sides of the former Waste Pond Area which was adjacent to the main production facility of the plant. A portion of the sheet pile wall remained in place as an LNAPL Barrier Wall measuring 295lf x 25’ deep consisting of EZ88 steel sheet pile with factory-applied Wadit® in the interlocks to ensure it is water/product tight. Soil excavation activities for this project were performed in three separate remedial excavation areas (REA’s) on a concurrent basis. The first phase of excavation activities was within pre-designated shallow scrape areas, followed by the Waste Pond Area and then an area of LNAPL migration known as the Pond’s Southeast leg. Excavation was performed to a maximum depth of 12’ below ground surface, with the average excavation at 7’ bgs. VIASANT excavated in excess of 21,000 cubic yards of overburden and impacted soil and sludge, with daily sorting/segregation of TSCA and Non-TSCA waste materials for direct load out and temporary (day piles) stockpiling. Approximately 5,800 tons of TSCA Hazardous waste was shipped to a Subtitle C landfill under the Mega Rule, and 5,700 tons of Non-TSCA soils to a Subtitle D landfill. Concurrent with excavation VIASANT dewatered the excavations and treated LNAPL impacted groundwater with both separation and dissolved phase filtration technologies. All treated water was tested and discharged in accordance with an NJDEP Surface Water Discharge Permit . The treatment system was designed to operate at 150 gpm and all collected LNAPL was stored and then shipped offsite for incineration. Once excavation activities were completed a combination of imported backfill and re-use soils were placed and compacted to design elevations. Major Utility Company - Former MGP Remedial Action Project VIASANT completed site remediation at this former MGP site. Work entailed the removal of MGP and Lead Hazardous impacted soils from three separate remedial excavation areas of the site. In addition to source removal activities VIASANT uncovered, decontaminated, and removed/abandoned various antiquated utilities that are no longer in service. Remedial excavation work in several of the areas required work in close proximity to live gas lines, fiber optic lines, and electrical conduits requiring strategic excavation techniques and some temporary bracing of live assets. To accomplish source removal adjacent to live gas lines VIASANT utilized both air knife and hydro-excavation soft dig technologies to ensure this remedial objective could be safely achieved. In total VIASANT excavated and offsite shipped approximately 9,500 tons of MGP soils (LTTD) and 120 tons of Lead Hazardous soils (RCRA TSDF). All MGP source removal work was conducted with real time air monitoring and the use of odor neutralizing technology to eliminate odor issues. Restoration activities included importing, backfilling and compacting approximately 10,000 tons of fill and stone, as well as performing final grading and E&S stabilization activities. VIASANT successfully installed a groundwater remediation system at this site to treat two separate VOC-impacted plumes spanning multiple property parcels. The Air Sparge and Soil Vapor Extraction System required excavation of approximately 4,600 linear feet of lateral and header trenches, as well as installation of over 11,500 feet of SDR-11 high density polyethylene pipe (HDPE) ranging in size from 2 to 6-inches overlain with reuse backfill. The expansive piping design tied into a mixture of schedule 80 PVC wells via custom galvanized steel and pre-fabricated PVC well heads equipped with orifice plate assemblies, valves and sample ports. A total of 65 deep sparge wells (32.5-52.5 feet bgs) and 42 shallow extraction wells (7-10 feet bgs) were installed using B-57 drill rig and track geoprobe units. Additional scope items included clearing, grubbing and chipping; erosion and sedimentation control installation and maintenance; securing of local permits; installation of 3 phase/480 volt power approximately 1200lf to the site; decommissioning of existing monitoring wells; installation of 6-foot chain link fence, a single 3ft man-gate, two 16ft double swing gates, and one 22ft slide gate; installation of 450lf of 6ft concrete protective barriers; construction of permanent access roads; load-out, transportation and disposal of solid and liquid waste; seeding and mulching; and planting of mature native trees. VIASANT was contracted to perform turn-key onsite waste treatment services at this former landfill site consistent with the NYSDEC Record of Decision. VIASANT retrieved representative samples from the three primary Remedial Areas of Concern (AOC’s) via test pitting. An extensive bench scale treatability test was performed on the sample to determine the lowest effective reagent dose (LERD) for chemical fixation/stabilization (CFS) of soils and sludge. A primary consideration of the study was the selection of a reagent for use in In-Situ treatment technologies per NYSDEC guidelines. The bench scale treatability study determined the correct dosage of our selected reagent that would render the waste RCRA non-hazardous for cadmium (Cd) and lead (Pb).