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<br />' 2.3 Field Quality Control <br />2.3.1 Field Duplicates: Field duplicates (splits) will be collected to <br />evaluate the precision of the analytical technique. One field <br />duplicate will be collected for every ten samples collected. <br />' Field duplicates shall be obtained by either compositing the entire <br />sample, then filling the appropriate bottles, or by using a flow <br />splitter on the pump discharge so duplicate samples can be obtained <br />simultaneously. <br />The duplicate sample will be submitted to a second independent <br />' laboratory that is U.S. EPA-certified for Safe Drinking Water Act <br />protocols, and will be analyzed for the same parameters as the <br />' original sample. Identification of the duplicate sample will be <br />recorded in the Field Data Collection Sheet for reference when <br />analyses are completed. <br />2.3.2 Field Blanks: One field blank, consisting of filling laboratory <br />containers with laboratory-provided de-ionized, distilled water in <br />the field, will be collected for every twenty water quality samples <br />obtained, or a minimum of one for every sampling series. The <br />analytical laboratory performing the analysis will supply the de- <br />ionized, distilled water which is to be used for field blanks. The <br />de-ionized, distilled water will be supplied by lot, and identified <br />by lot number. The laboratory supplying the de-ionized, distilled <br />water will perform an analysis on each lot to demonstrate that the <br />water is analyte free. <br />1 <br />2.3.3 Rinse Blanks: Prior to any sampling, and at every fifth sample, <br />' a rinse blank will be collected. Rinse blanks will be collected <br />from each component of the sampling equipment, e.g. bailer, barrel <br />filter and filling bucket. <br />' -19- <br /> <br />