R2006-74 AUTHORIZING THE EXECUTION OF TASK ORDER NO. 9

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. , DEPARTMENT OF WATER MANAGEMENT Memorandum No. 2006 - 06 May 8, 2006 TO: Honorable Mayor Osborne and City Council FROM: Steve Garman, City Manager John A. Smith, Assistant City Manager for Public Services _ Keith D. Alexander, Director of Water Management � SUBJECT: South Water Treatment Plant Chlorine Feed System Improvements SUMMARY RECOMMENDATION: Council adopt the attached resolution approving Task Order No. 9, with Attachments A and B, for a Continuing Agreement for Engineering Services with Black & Veatch Corporation to provide prebid and construction phase services for South Water Treatment Plant chlorine feed system improvements at a cost not to exceed $114,800. BACKGROUND: In 2004 Council authorized Black & Veatch to provide engineering services and bid specifications for chlorine gas safety improvements at the South Water Treatment Plant to reduce the potential for accidental chlorine releases and to replace aging equipment. These services were completed and the project was deferred for one year due to budgetary constraints. The federally mandated Risk Management Program (for hazardous chemical safety) and the International Fire Code 2003 (currently adopted by the City) require mitigation for these potential releases. Chlorine gas can be highly toxic if released into the air. The safety improvements of this project are: ■ Chlorine leaks cannot occur from the new piping since the system will operate under negative pressure (a vacuum). Vacuum systems allow outside air to be drawn into the piping rather than chlorine being released into the air. ■ Eliminates all pressurized chlorine in the feed system and associated safety concerns. ■ Eliminates two existing aging liquid chlorine evaporators and their associated maintenance and safety concerns. ■ Dramatically reduces the risk to City staff and the general public from a large accidental chlorine release. ■ In the unlikely event that a chlorine release does occur in the future, this project also includes the installation of a chlorine gas scrubber, which chemically converts chlorine gas into a non toxic compound. This resolution authorizes Black & Veatch to update the two year old bid specifications, update cost estimates, and provide construction management services during actual construction.