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F + <br /> f � , <br /> Section 'No 11 <br /> Revision No 0 . <br /> Date September 5, 1991 <br /> Page 5 of S+ <br /> ambient air may be utilized if, the quality 'of 'this+ air is found to be <br /> consistent and thus able to be or accounted for in, the field blank <br /> evaluation Field blank sample collection may involye the direct transfer, <br /> I , i tl <br /> through the sample pump, - of"blank" air to the appropriate sample container <br /> - For - soil gas probes, field blank preparation will1involve the passage of <br /> 'blank or ambient air "through, a typical! probe ''prior ,to collection and <br /> analysis, with sample collection' performed using °the same equipment , and <br /> techniques as -used-for actual fibld_samples `_ <br /> 11 1 3 Field Duplicates' „ r <br /> Field duplic{ates'xare collected to 'evaluate the reproducibility of <br /> •laboratory data or physical measurements " Fi`eld duplicates are prepared by <br /> 4 vI < 11 , I <br /> _ - the immediate-'sequential- filling- of-- sample,- containers at the- same.. sample <br /> location,?- or by the- collection and mixing-Of a ,sample-in one container and - _- <br /> subsequent transfer into two'other containers Field duplicates are samples <br /> sent to the same laboratory, and which are labeled in such a manner as to <br /> suggest they are samples from, different locations <br /> 11 1 3.1 Soil Gas Samples - Duplicate soil gas samples are collected <br /> Y from each sampling location Duplicate analyses are performed on at least -10 y yi ` <br /> percent of' the samples collected, or if the initial analysis is outside QA <br /> specifications <br /> 11 1 3 2 Water Samples - Field duplicatewatersamples should be u <br /> collected for approximately 1 out of every 10 water samples collected " Field ; <br /> duplicates are prepared by the sequential filling of sample containers If �. <br /> 11-5 <br />