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US TOEROEK <br /> ASSOCIATES,INC. <br /> SOP Revision History <br /> The Toeroek Quality Manager is responsible for maintaining previous versions of the <br /> document. <br /> History Effective Date <br /> Current Version: <br /> SOP No. 021, Soil Gas Sampling Methods July 1, 2022 <br /> Revision 1, 13 pages <br /> NOTES: <br /> Reviewed—no changes October 2, 2013 <br /> Reviewed—no changes July 24, 2014 <br /> Reviewed—no changes (minor edits) May 1, 2016 <br /> Reviewed—updated logo and pagination July 1, 2022 <br /> Previous Version: <br /> Previous Versions are electronic files that are archived <br /> SOP No. 021, Soil Gas Sampling Methods November 28, 2012 <br /> Revision 0, 13 pages <br />