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EPA methods require analysis of VOA samples within seven days if unpreserved and 14 days if preserved — typically with hydrochloric acid. ESS (San Leandro, California) conducted an internal trip blank study in 2018. Seventy-two EPA vials were filled to zero headspace with medium cap tightness.
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2.2 For soil samples, additional sample volume is collected in a VOA vial for dry weight determination and for high concentration determination if the sample concentration requires it. 2.3 In the laboratory, the vials are rotated to allow for diffusion of the internal standards,