TN&A has constructed soil vapor, groundwater extraction, and dewatering systems as well as landfill caps and leachate collection systems. Our experience also includes above ground and underground storage tank removal and closure, and demolition and debris removal. We have performed excavation and removal operations for PCB, radioactive, lead, and petroleum-contaminated materials, including analytical testing, documentation, and disposal. TN&A has staff certified in the USACE three-phase construction QC process. TN&A has provided design/build services for SVE and groundwater treatment systems to remove dissolved and free-phase jet fuel from groundwater.
TN&A performed an extensive Remedial Action at the Nascolite Superfund site in Millville, New Jersey. The project included excavation, characterization, transportation, and disposal of 67,000 tons of lead- and VOC-contaminated soil and 865,000 gallons of liquid waste. TN&A developed a complete sampling plan and procedures and used 24-hour rapid turnaround laboratory analysis to determine soil contaminant concentrations, to direct excavation operations, and to avoid material handling delays. We instituted strict safety controls and delivered over 35,000 safe man-hours and “zero” lost time accidents through construction completion. USACE Philadelphia District nominated TN&A for an Excellent Safety Performance Award.
TN&A completed an expedited removal action that included the excavation of approximately 1,100 cubic yards of metal-contaminated soil and subsequent wetland restoration for an electrokinetic remediation (EKR) pilot test / demonstration system at the former plating waste pits at Point Mugu, California. The project area was in and adjacent to a tidal salt marsh and designated wetlands. In response to ecological concerns, TN&A developed and complied with activity restrictions to protect the light-footed clapper rail, a federal- and state-listed endangered bird species known to nest in the area. TN&A was able to overcome the obstacles to excavation and dewatering without impact to the wetland or disruption of any endangered species through careful planning and by providing clear operational procedures to field crews. During the removal action, more than $60,000 of cost savings were realized by the Navy through TN&A’s use of statistically-based waste characterization program that was used to classify the soil at IR site 5 for disposal purposes.
