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PUBLIC WORKS MEMORANDUM <br /> NO.2018-13 <br /> DATE: April 6,2018 <br /> TO: Honorable Mayor Julie Moore Wolfe and City Council Members <br /> FROM: Tim Gleason, City Manager <br /> Matt Newell,P.E.,Public Works Director <br /> SUBJECT: Resolution Approving an Agreement with Strand Associates,Inc. for <br /> Professional Engineering Services for the 2018 Water System Hydraulic Model <br /> Update and Extended Period Simulation (EPS) <br /> City Project 2018-04 <br /> SUMMARY RECOMMENDATION: <br /> It is recommended that the City Council approve the attached Resolution authorizing the Mayor to <br /> sign, and the City Clerk to attest, a professional engineering services agreement between the City of <br /> Decatur and Strand Associates, Inc,to provide professional services for an update and analysis of the <br /> Water System Hydraulic Model, for a fee not to exceed $170,897. <br /> PRIOR COUNCIL ACTION: <br /> This work is budgeted in the 2018 Capital Improvement Plan. <br /> BACKGROUND: <br /> The Illinois Environmental Protection Agency requires culinary water systems in the State to <br /> maintain 0.2 mg/1 of free chlorine residual within their distribution systems. The City routinely <br /> samples the water distribution system to assure that this minimum residual is maintained. As water <br /> ages,the free chlorine residual naturally dissipates or reduces. To assure that the water distribution <br /> system is operating to prevent areas of old water within the system, it is proposed that an Extended <br /> Period Simulation(EPS)be run on the system. An EPS simulation identifies any areas prone to <br /> reduced chlorine or aging water and can advise on how best to address them. <br /> Strand Associates, Inc. (Strand) has been providing the City with water system modeling and <br /> master planning services since 2000 and currently maintains the City's water distribution model. <br /> Strand's experience with City's water system allows them to provide the City with high quality and <br /> efficient professional services. <br /> Engineering Services Agreement <br /> The 2018 Water System Hydraulic Model Update will provide the City with an extended period <br /> simulation(EPS)that will model the water age and chlorine residual within the water distribution <br /> system. The model will be calibrated during August which is a time of low water turnover within the <br /> system,when water aging may be at its worst. <br /> ^ 1 ^ <br />