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Q <br /> 4 ' <br /> White Slough Water Pollutionntrol Pl<<nt 21 March 2000 <br /> Inspection Report <br /> ti <br /> 'r <br /> Flash Waxer unit near dose sample collection Residual chlorine sample collection point located <br /> location. just after chlorine contact chamber. <br /> Description of Chlorine Excursion <br /> As indicated by both Mr. Kerlin and Mr. Moroz, the drain tube on the dose analyzer became plugged <br /> sometime on the evening of 3 January 2000. Once the tube plugged, the sample bypassed the detection <br /> cell of the.analyzer, sending an erroneous signal to the chlorinator. In essence, the analyzer was <br /> reading a stale sample and sent a signal to the chlorinator that indicated that there was insufficient <br /> chlorine present. As would be expected, the residual chlorine analyzer detected higher and higher <br /> chlorine residual, which in turn, sent a signal to the sulfonator to increase the sulfur dioxide dosing. <br /> Mr. Moroz indicated that the addition of sulfur dioxide was able to dechlorinate the effluent for a <br /> period of time until chlorine breakthrough occurred. <br /> { <br /> Picture of the drain tube of the chlorine "dose" <br /> analyzer. This is the tube that became plugged. <br /> Review of the dose chlorination analyzer chart (Attachment 1)from 3 January 2000 indicates that <br /> deviation from standard dosage response began as early as 2100 hours and that by about 2200 hours the <br /> meter was indicating a constant reading of about 3.5 mg/1. This condition continued until shortly after <br /> 0700 hours the next morning when the problem was noted and the chart was changed by the morning <br /> staff. Discussions with Mr. Moroz indicated that the total volume of chlorinated wastewater discharged <br /> is believed to be roughly 600,000 gallons. <br />