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,r , <br /> DEPARTMENT OF WATER MANAGEMENT I <br /> Memorandum No. 2004 - 12 I <br /> Jul 14 2004 �' <br /> Y , <br /> TO: Honorable Mayor Osborne and City Council <br /> FROM: Steve Garman, City Manager <br /> John A. Smith, Assistant City Manager for Public Services <br /> Keith D. Alexander, Directar of Water Managemen� <br /> SUBJECT: South Water Treatment Plant Chlorine Feed System Improvements <br /> SUMMARY RECOMMENDATION: <br /> Council adopt the attached resolution approving Task Order No. 4, with Attachments A and B, <br /> for a Continuing Agreement for Engineering Services with Black & Veatch Corporation to <br /> provide design and bid phase services for South Water Treatment Plant chlorine feed system <br /> improvements at a lump sum fee of$127,700. <br /> BACKGROUND: <br /> Council adopted a resolution on September 2, 2003, for Black & Veatch to examine chlorine <br /> gas safety improvements at the South Water Treatment Plant to further reduce the potential for <br /> accidental chlorine releases. In addition, the federally mandated Risk Management Program <br /> (for hazardous chemical safety) and the International Fire Code 2003 (currently adopted by the <br /> City) require mitigation for these potential releases. Chlorine can be highly toxic if released <br /> into the air. Based on the results of Black & Veatch's study, City staff recommend that a <br /> vacuum operated chlorine feed system be installed at the South Water Treatment Plant due to <br /> the following advantages: <br /> ■ Chlorine leaks cannot occur from the piping since the system operates under negative <br /> pressure (a vacuum). Vacuum systems allow outside air to be drawn into the piping rather <br /> than chlorine being released into the air. <br /> ■ Eliminates all pressurized chlorine in the feed system and associated safety concerns. <br /> ■ Eliminates two existing liquid chlorine evaporators and their associated maintenance and <br /> safety concerns. <br /> ■ Dramatically reduces the risk to City staff and the general public from a large accidental <br /> chlorine release. � <br /> ■ In the unlikely event that a chlorine release does occur in the future, this project also <br /> includes the installation of a chlorine gas scrubber,which chemically converts chlorine gas <br /> into a non toxic compound. <br /> , <br />