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<br />1 <br /> <br /> <br /> <br />1 <br /> <br /> <br />Prior to sampling, a representative sample from the surface water <br />stream monitoring point will be poured into a separate clean vessel <br />to measure the field parameters of pH, specific cCnductance, <br />temperature and dissolved oxygen. All instrument probes that come <br />into contact with the sample water and the measurement vessel will <br />be cleaned between uses using laboratory-provided deion~ized water. <br />A minimum of two sets of measurements will be made at @ach sample <br />location to evaluate if the measured parameters are repr@sentative. <br />Replicate measurements will be made a minimum of onp time per <br />sample period in the following manner: <br />(1) collect a sample of water into the measurement vessel; <br />(2) measure field parameters; <br /> <br /> <br /> <br />LJ <br /> <br />1 <br />1 <br />1 <br /> <br /> <br />(3) rinse instrument probes in deionized water; and <br />(4) re-measure field parameters in the same sample. <br />3.2.6 Sample Filtration: Surface water samples requirifig on-site <br />filtration will be filtered using a barrel filter apparatus, which <br />filters through a 0.45-micron membrane. Alternatively, disposable <br />0.45-micron filter cartridges may be attached directly to the pump <br />discharge. <br />Samples will be preserved directly following filtration. <br />Filter apparatus will be cleaned by having the solutions "pulled" <br />through the apparatus prior to and after each use in th@ following <br />manner: <br />(1) mild non-phosphatic detergent wash; <br />(2) tap water rinse. ~" ,) <br />~(~" _- <br /> <br />