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<br /> <br />' Replicate measurements will be made a minimum of one time per <br />sample period in the following manner: <br />(1) collect a sample of water into measurement vessel; <br />' (2) measure field parameters; <br />(3) rinse instrument probes in de-ionized water; and <br />(4) re-measure field parameters.in same sample. <br />' 2.2.10 Sample Filtration: Samples requiring on-site filtration will be <br />filtered using a filter apparatus, which filters through a 0.45- <br />' micron membrane. <br />Samples will be preserved directly following filtration. <br />Filter apparatus, unless disposable, will be cleaned by having the <br />solutions "pulled" through the apparatus prior to, and after, each <br />use in the following manner: <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <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 1o 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 de-ionized, distilled water throughout the <br />entire filtering apparatus. Analysis of this rinse blank will be <br />used to validate cleaning procedures. <br />-18- <br /> <br />