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After an initial determination that the treatment process is effective using EPA test method 200.7 <br /> and measurement of pH , AASC's lab will perform chromium analyses using atomic absorption <br /> spectroscopy and we'll measure the pH using the HACH pH probe and meter after each <br /> treatment cycle and only discharge to the city sewer if analyses meet POTW permit conditions. <br /> SAMPLING METHODS <br /> Samples will be collected from each of the two alodizing rinse waters and the water scrubber <br /> unit. These locations are from each source which make up the aqueous solutions requiring <br /> treatment. A coliwasa tube will be used to obtain representative samples from each of the 3 <br /> locations. After treatment, samples will be taken from the chromium treatment system discharge <br /> tank. A coliwasa tube will also be used to collect these samples. <br /> FREQUENCY OF ANALYSIS <br /> Analysis at the point of discharge will be initially conducted to determine the proper tier <br /> category under the tiered permitting system and periodically, unless there is a change to the <br /> process, at which time analysis of the affected source will be conducted. After treatment, <br /> analysis of the treated water will be initially collected from the chromium treatment system <br /> discharge tank and pH and chromium analysis will be performed by a certified lab. After the <br /> initial analysis by a certified lab, all future samples will be analyzed for chromium by AASC's <br /> lab using Atomic Absoprtion Spectroscopy and pH using the lab's pH meter prior to discharge to <br /> the city sewer. After treatment, all chromium results will be documented and maintained with <br /> the daily inspection log sheets. <br />