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addition, an automatic continuous chromate analyzer will be installed after <br /> the secondary anion exchanger as indicated in Figure 4 to measure the <br /> chromate (hexavalent chromium) concentration. This analyzer acts as a <br /> backup during normal operation to totalizer readings. If maximum acceptable <br /> effluent hexavalent chromium levels are approached, the chromate analyzer <br /> will override the totalizer control, shut the system down, and alert the <br /> operator of abnormal shutdown. If the system shuts down due to either <br /> normal or abnormal conditions, no more flow can be discharged to the <br /> Diverting Canal. <br /> The operator will also continuously monitor other devices provided to <br /> give information on the effectiveness of system performance. These devices <br /> will measure pressure at various places in the system, pH (the degree of <br /> acidity or alkalinity) of the influent and effluent, and conductivity of <br /> the water (a measure of the dissolved materials) . <br /> SAFETY FEATURES <br /> Several safety features have been included in the treatment plant <br /> design to maximize protection of public health and the environment. These <br /> features include the following: <br /> o Perimeter Curb. A curb will be installed around the perimeter of <br /> the North Yard. Storm water falling on the site will be blocked <br /> from running off of the yard. <br /> o Secondary Containment. All tanks which hold potentially hazardous <br /> chemicals will be contained within concrete or synthetic membrane— <br /> lined areas. The containment areas will hold the liquids in the <br /> event of a spill or leak. <br /> o Automatic Controls. The ion exchange equipment is controlled <br /> from a control panel. All necessary control switches, indicating <br /> lights, conductivity and chromate monitors, recorders, and indicators <br /> needed for operation of the water treatment plant are mounted on <br /> the control panel front. A programmable controller is furnished <br /> to receive status intelligence from system monitors and sensors, <br /> perform control logic functions, issue control commands, and <br /> provide alarm and status information for the system. <br /> S6 6 <br /> HII <br />