Our client, a renowned developer for Airports, was tasked with constructing a new 31,500 square feet airplane hangar building along with a 2,500 square feet office building, associated aircraft apron, and automobile parking areas for a California Airport. Because the proposed Site is located within a methane zone, the permitting agency requested a methane investigation to be conducted in accordance with the City, Development Services Building and Safety Bureau, Methane Gas Mitigation Information Bulletin IB-055 and the Department of Toxic Substances Control’s (DTSC) Advisory for Active Soil Gas Investigations.
A-Tech developed the work plan for methane investigation, drilled 14 locations and installed soil vapor probes at 4 feet below ground surface (bgs), and collected soil gas samples and analyzed them for fixed gases including methane. All results were below the laboratory practical quantification limits (PQL), and A-Tech prepared a final report for submission to the permitting agency. The client was delighted with A-Tech’s responsiveness, as we completed this project on a rushed turnaround because the permitting process was delaying the construction plans. A-Tech arranged and delivered all the services within a month period.