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• Section No 11 <br /> Revision No 0 <br /> Date September 5, 1991 <br /> Page 2 of 8 <br /> known to contain non-detectable levels of constituents of interest These <br /> samples are then transported with the filed samples and analyzed for evidence <br /> of systematic contamination from the sample container, sample storage and <br /> transport, or sample analysis Because travel blanks are used to detect <br /> systematic contamination from sample containers, travel blanks shall be <br /> prepared from the same "batch" of sample containers as used for the field <br /> samples <br /> 11 1 1 1 Soil Gas Samples - An unused sample cartridge is transported <br /> into the field with the sampling equipment The trip blank cartridge is <br /> handled in the same manner as a sample, but a sample is not collected through <br /> this cartridge The trip blank is returned to the lab with the other samples <br /> and analyzed If VOCs are detected, sample handling and transport procedures <br /> are subsequently reviewed <br /> 11 1 1 2 Water Samples - Travel blanks for water sampling program <br /> generally refer to the preparation of samples using "organic free" water for <br /> subsequent analysis for volatile organics One volatile organic travel blank <br /> should be analyzed per day per transport container Travel blanks are also <br /> prepared for subsequent analysis for non-volatile organics and metals, when <br /> these parameters are also of potential concern Travel blanks for these <br /> parameters should be analyzed at a frequency of approximately one for every <br /> 20 samples collected <br /> 11-2 <br />