We avoid confined space entry and our guys carry gas analyzers/monitors. We keep environmental forms very profitable.
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In most cases, yes. Cisterns and water tanks can accumulate higher concentrations when closed up, releasing the gas when opened for inspection or maintenance. When I was working hazmat in Santa Barbara, 5 workers were killed when they were working in a water well. Two went down and three others when they went in to rescue w/o breathing apparatus (SCBA).
CA has high levels in water and oil.....first thing rule in training is never go into an enclosed space rescue w/o safety equipment.
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