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HomeMy WebLinkAboutCOUNCIL - AGENDA ITEM - 10/01/2002 - SECOND READING OF ORDINANCE NO. 139, 2002, APPROPR AGENDA ITEM SUMMARY ITEM NUMBER: ll DATE: October 1, 2002 FORT COLLINS CITY COUNCIL FROM: Michael B. Smith Brian Janonis SUBJECT : Second Reading of Ordinance No. 139, 2002, Appropriating Prior Year Reserves in the Water Fund to Construct Backwash Water Reuse Facilities. RECOMMENDATION: Staff recommends adoption of the Ordinance on Second Reading. EXECUTIVE SUMMARY: The appropriation from prior year reserves is required to start construction. The Utilities and Purchasing are now exploring the possibility of obtaining a five-year lease purchase to finance the backflow water reuse facility. City Council would have to approve the lease purchase agreement which would be obtained either later this year or after the project is complete. If the lease is obtained, it would spread out the financial impact of the backwash water reuse facility, however, the project could be completed without the lease purchase if necessary. This Ordinance, which was unanimously adopted on First Reading on September 17, 2002, authorizes a $1,544,000 appropriation of prior year reserves in the Water Fund for a capital project to construct backwash water reuse facilities at the Water Treatment Plant. AGENDA ITEM SUMMARY ITEM NUMBER: 23 DATE: September 17, 2002 FORT COLLINS CITY COUNCIL Michael B. Smith 10 STAFF: Brian Janonis SUBJECT: First Reading of Ordinance No. 139, 2002, Appropriating Prior Year Reserves in the Water Fund to Construct Backwash Water Reuse Facilities. RECOMMENDATION: Staff recommends adoption o e Ordi ce o PtReading FINANCIAL IMPACT: The projected cost to recycle backwash water is $1,544,000. These funds would come from water fund reserves. By recycling the water, the City could increase the City's annual water supply by about 1,500 acre-fee co hi u i 000 an acre-foot. Colorado- Big Thompson ("CBT") wat is sel i for $1 0 e unit, with a high quota of one acre-foot per unit or $10,00 n acre- ot. h year' quota set between 0.30 and 0.50 acre-feet per unit, CBT water 11 20,00 $33,333 per acre-foot. EXECUTIVE SUMMARY: This Ordinance authorizes a $1,544,000 appropriation of prior year reserves in the Water Fund for a capital project to construct backwash water reuse facilities at the Water Treatment Plant. Once constructed, the recycli COOPY tely 1,500 acre-feet of water annually. BACKGROUND: As part of the water treatment process, filters must be cleaned periodically (typically once per day). The filters are cleaned by reversing flow through the filters, and the "backwash" water is discharged to the ponds immediately north of the Fort Collins Water Treatment Facility. The EPA and State of Colorado allow either recycle or discharge of the spent backwash water. The Fort Collins Water Treatment Facility discharges filter backwash water to either the Pleasant Valley Lake and Canal or Claymore Lake. The decision to take this approach was made primarily due to the concerns regarding adverse effects on the treatment efficiency of the original Treatment Trains 1 and 2 and concentration of pathogens. The Ordinance would allow the Utility to proceed to modify this system to recycle rather than discharge the backwash water, in view of the following new considerations: DATE: September 11, 2002 1 2 ITEM NUMBER: 23 • With the completion of the Master Plan facilities, Treatment Trains 1 and 2 have been abandoned, and replaced with more efficient and reliable treatment processes that can appropriately treat the recycle flow stream • New treatment systems can now be used to treat backwash water and effectively kill the pathogens. • On-going drought conditions necessitate that Fort Collins Utilities examine every option to increase its water supply. As directed by City Council, staff is looking at demand management options. Backwash water recycling could significantly reduce treatment process consumption of raw water in a timely fashion, with minimal impact to customers. Approximately 90 percentCthe Ovate c rec ed. During the last two years, approximately 1,800 acre-feh er ' as nually d harged. Based on the expected increase in demand and production, this volume could increase to more than 2,100 acre-feet per year by 2040. Because of its simplicity, low cost, and outstanding capability for pathogen disinfection, UV disinfection is recommended for treatment of the washwater. There are a number of manufacturers of UV units on the market. Based on performance on other projects, as well as cost, and physical size, a medium pressure UV chamber should be considered for this application. The project work needed to add such a chamber to the system would consist of new piping to divert the washwater ed th ' i as ter lagoons, a variable speed pump station, pipeline, and ium r sure V er, o meter, and power supply. The system should be sized to re le and at 11 s 4 m . This would allow capture of at least 90 percent of the waste t ' u ntly disc ed to the Pleasant Valley Lake and Canal system. Staff estimates the new recycling system will be operational by next summer.