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1 <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, by running <br />laboratory-provided deionized, 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 Oualitv Control <br />1 <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 ref@rence when <br />' analyses are completed. <br />' 3.3.2 Field Blanks: One field blank, consisting of filling laboratory <br />containers with laboratory-provided deionized, distilled water in <br />' the field, will be collected for every twenty water quality samples <br />obtained, or a minimum of one every sampling series. The <br />analytical laboratory performing the analysis will supply the <br />deionized, distilled water which is to be used for field blanks. <br />The laboratory supplying the deionized, distilled water will <br />' perform an analysis on each lot to demonstrate that tlhe water is <br />analyte free. <br />' -24 <br />1 <br />