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<br />(1) mild non-phosphatic detergent wash; <br />(2) tap water rinse; <br />' (3) final rinse with de-ionized water. <br />' Following a filtration series of no more than 10 samples, a rinse <br />blank will be collected from the cleaned apparatus or, if <br />' applicable, through an un-used filter cartridge, ~y running <br />laboratory-provided de-ionized, distilled water throughout the <br />' entire filtering apparatus. Analysis of this rinse blank will be <br />used to validate cleaning procedures. <br />3.3 Field Quality Control <br />3.3.1 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 will be obtained by compositing the entire sample, <br />then filling the appropriate bottles. <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 />3.3.2 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 every sampling serifs. 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 />' -25 <br />