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=e'�^ ^e Prontls - <br /> _ vro�me�iai Neeas <br /> JNM . ° - - <br /> January 20, 1993 <br /> 1W\ At <br /> City of Manteca j pN 2 1993 <br /> 1001 West Center Street yTECA <br /> Manteca, CA 95336 Q Tpp i <br /> Attention: Jim Podesta aITPT <br /> -,r nFP T <br /> File: 912.0460 <br /> Subject: Olin Corporation - MQUAD Wastewater Treatment System Inspection <br /> The wastewater treatment system for Olin Corporation's MQUAD line was inspected on <br /> January 19, 1993. The inspection was attended Jim Podesta and Warren Shannon of the <br /> City of Manteca, Bill Price of Olin, and Keith Conarroe of James M. Montgomery. The <br /> purpose of the inspection was to verify installation of the treatment system proposed by <br /> Olin Corporation, and effluent monitoring and sampling provisions requested during the <br /> City of Manteca wastewater discharge permit review. <br /> The wastewater produced by Olin's MQUAD line will be treated in a three stage <br /> neutralization system prior to discharge to the City of Manteca. Wastewater from the <br /> MQUAD line is received in a wastewater sump located in the wastewater treatment plant. <br /> The wastewater is transferred from the sump to a 2,000 gallon holding tank. The <br /> wastewater is pumped from the holding tank at a rate of 20 gpm to the neutralization <br /> system. Sulfuric acid, and sodium hydroxide are used to neutralize the wastewater. Each <br /> stage of the neutralization system has pH monitor for control of sulfuric acid and sodium <br /> hydroxide feed. The final stage pH monitor is interlocked with a valve to recycle the <br /> wastewater back to the holding tank should the pH exceed alarm set points. Tentative pH <br /> alarm set points are 6.5 and 9.5, which are within the City of Manteca waste discharge <br /> limits. <br /> The wastewater treatment plant is located within a concrete containment basin. Rain <br /> water and other drainage in the concrete containment area collect in a drainage sump, and <br /> are discharged to the neutralization system for disposal. The sulfuric acid and sodium <br /> hydroxide storage tanks are double contained to prevent release into the concrete <br /> containment area. <br />