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City of San Leandro <br />Meeting Date: May 15, 2017 <br />Staff Report <br />Agenda Section:File Number:17-263 CONSENT CALENDAR <br />Agenda Number:8.H. <br />TO:City Council <br />FROM:Chris Zapata <br />City Manager <br />BY:Debbie Pollart <br />Public Works Director <br />FINANCE REVIEW:David Baum <br />Finance Director <br />TITLE:Staff Report to Approve a Sole Source Purchase by the Water Pollution <br />Control Plant (WPCP) of One Thousand Aeration Basin Fine-Bubble <br />Membrane Diffusers from Evoqua Water Technologies for an Amount Not to <br />Exceed $86,000 <br />SUMMARY AND RECOMMENDATIONS <br />The WPCP needs to replace 1,000 existing diffusers in the aeration basins due to <br />degradation of the existing diffusers that is creating a loss of aeration efficiency. <br />Staff recommends City Council adopt a Resolution making a finding under California Public <br />Contract Code section 3400(c)(3) that a sole-source Purchase Order not to exceed $86,000 is <br />appropriate to provide 1,000 replacement bubble diffusers. <br />Staff recommends a sole source Purchase Order because there is only one U.S. vendor that <br />sells this particular style diffuser. <br />BACKGROUND <br />The WPCP had fine-bubble membrane diffusers installed in one aeration basin in 1990 and in <br />the second aeration basin in 2002. Typically, membrane diffusers have a nominal 10-year life <br />span. <br />During the last few years, the WPCP has been seeing spikes in influent loading which has led <br />to two aeration blowers being on simultaneously to maintain adequate oxygen levels. During <br />warm months, this can be an almost daily occurrence. This frequent increase in airflow has <br />led to the rapid degradation of the existing membrane diffusers, which have also existed well <br />beyond their typical life span. <br />Analysis <br />Page 1 City of San Leandro Printed on 5/8/2017 <br />191