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Section No 11 <br /> Revision No 0 <br /> Date September 5, 1991 <br /> Page 8 of 8 <br /> the spike solutions The laboratory should also prepare duplicates of the <br /> spike solutions and store the duplicates (at 40C) for a period of not less <br /> than 60 days for possible confirmatory analysis at the discretion of the <br /> Project Manager <br /> 11 1 5 1 Soil Gas Samples - During each standard calibration procedure <br /> for soil gas analysis, the matrix (the activated carbon in the sample <br /> collection cartridges only) is directly spiked and thermally desorbed <br /> 11 1 5 2 Water Samples - A blind spike sample should be prepared and <br /> submitted for every 20 field sample collected Final selection of the spike <br /> frequency, laboratory to prepare the spike, and constituents and <br /> concentrations to be spiked shall be made by the Project Manager or as <br /> specified in the sampling and analysis plan <br /> 11 1 5 3 Soil Samples - Due to problems associated with evenly <br /> distributing a spike to a soil sample, no blind soil spikes are recommended <br /> 11 1 5 4 Air Samples - A blind spike sample should be prepared and <br /> submitted for every 20 samples collected Final selection of the spike <br /> frequency laboratory to prepare the spike, and constituents and <br /> concentrations of the spike shall be made by the Pr03ect Manager or as <br /> specified in the sampling and analysis plan <br /> • <br /> 11-8 <br />