Near real-time data generated in the onsite laboratory from a separate concurrent shallow soil investigation effort in TNT MfV were used to determine potential deep soil hotspots. Tetra Tech used direct push to collect soil and groundwater samples from 20 ft to depths of over 105 ft. ArcView® and Rockworks® visualization tools were used to generate 2-D and 3-D diagrams. Data generated were e-mailed to stakeholders to review prior to weekly conference calls where stakeholders contributed to field-based decisions on a near real-time basis.
The onsite laboratory included 12 gas chromatographs and an inductively coupled plasma mass spectrometer (ICP/MS) for analysis of soil and/or water samples for explosives, TAL metals, and PCBs. Over the duration of the 8-month concurrent investigations, the onsite laboratory analyzed over 10,000 samples providing rapid results throughout the duration.
The Triad approach eliminated multiple mobilizations of equipment and personnel typically required in standard site investigations, which resulted in an estimated fuel savings of over 2000 gallons. In addition, since soil contamination areas were delineated to clean, excavations for soil less than 20 feet could be completed without the need for confirmation samples, which eliminated the need for multiple mobilizations of heavy equipment for resampling and additional excavation to the excavations saving an estimated 4,000 gallons of fuel.
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