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. Section No 11 <br /> Revision No 0 <br /> Date September 5, 1991 <br /> Page 6 of 8 <br /> field split samples are also being collected, the frequency of field <br /> duplicate samples should be reduced so that either a field duplicate or field <br /> split is collected for approximately one out of every 10 water samples <br /> collected <br /> 11 1 3 3 Soil Samples - Field duplicate soil samples are not <br /> recommended due to difficulties in obtaining true "duplicate" samples in the <br /> field <br /> 11 1 3 4 Air Sample - Field duplicate air samples should be collected <br /> for approximately 1 out of every 10 air samples collected Field duplicates <br /> • are prepared by the sequential filling of sample containers If field split <br /> samples are also being collected, the frequency of field duplicate samples <br /> should be reduced so that either a field duplicate or field split is <br /> collected for approximately one out of every 10 air samples <br /> 11 1 4 Field Splits <br /> Field splits are collected to evaluate the reproducibility and <br /> comparability of laboratory data or physical measurements Field splits are <br /> prepared by the immediate sequential filling of sample containers at the same <br /> sample location, or by the collection and mixing of a sample in one container <br /> and subsequent transfer into two other containers Field splits are samples <br /> sent to different laboratories, and which are labeled as if they are routine <br /> field samples <br /> • <br /> 11-6 <br />