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• Section No 11 <br /> Revision No 0 <br /> Date September 5, 1991 <br /> Page 4 of 8 <br /> measure of the atmospheric concentrations Additional field blanks are <br /> collected prior to any reuse of recleaned sampling equipment <br /> 11.1 2 2 Water Samples - For water sampling programs, one field blank <br /> should be prepared and analyzed for every 10 samples collected Procedures <br /> for the preparation of field blanks will vary depending on the equipment and <br /> procedures used for water sampling When sampling wells with dedicated <br /> equipment, field blanks shall be collected by simply filling a typical <br /> sampling container with "blank" water in the field, in the same manner that <br /> field samples are collected Alternatively, for water samples collected from <br /> temporary probes, field blanks shall be collected by placing the probe in a <br /> • container of "blank" water and pumping water through the probe into the <br /> sample container, simulating, to the closest extent possible, the collection <br /> of a field water sample using this method <br /> 11 1 2 3 Soil Samples - Due to problems associated with the <br /> verification of "blank" soil, no soil field blanks are recommended as part of <br /> the quality control program. <br /> 11 1 2 4 Air Samples - For air sampling programs, one field blank <br /> should be prepared and analyzed for every 10 field samples collected As <br /> with field blanks for water sampling programs, field blanks for air sampling <br /> programs will vary depending on the equipment and procedures used for the air <br /> sampling Air certified to contain non-detectable levels of the constituents <br /> of interest should be used for the preparation of field blanks For <br /> situations where immediate on-site analysis is being performed, background or <br /> 11-4 <br />