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-_.; Agenda Section: 9.B <br /> � G�©� REQUEST FOR COUNCIL CONSIDERATION Report Number: 92-418C <br /> STAFF REPORT Report Date: 11-19-92 <br /> 1111, <br /> Council Action: <br /> November 23 , 1992 ❑ Special Order of Business <br /> CITY COUNCIL MEETING DATE 0 Public Hearings <br /> 0 Consent Agenda <br /> 0 Council Business <br /> Item Description: Water Treatment Plant Equipment Bids <br /> Administrator's Review/Recommendation: y� <br /> - No comments to supplement this report �"1( <br /> - Comments attached. <br /> Explanation/Summary (attach supplement sheets as necessary.) <br /> SUMMARY; <br /> After receiving the bids for equipment at treatment plant #2 and <br /> plant #3, staff visited Hudson, Wisconsin to review their system <br /> and modifications they had made to their equipment. They had <br /> modified their process to include chlorinating the raw water <br /> prior to filtering and their filters used anthracite rather than <br /> silica sand as a filtering media. They acheived very low levels <br /> of manganese and iron, significantly below the recommended guide- <br /> lines. <br /> After returning from Hudson, staff modified treatment plant 6 to <br /> provide chlorination prior to filtering. Test results indicate <br /> that the change has allowed our filters to meet the recommended <br /> level of manganese (0 . 05 parts per million) . Test results have <br /> been in the 0.042 to 0 .048 range. The filters are still using <br /> silica sand as a filtering media, and it is our belief that <br /> changing to anthracite will result in meeting the guidelines for <br /> manganese. The test results show that the filters are achieving <br /> very good levels of iron removal, significantly below the guide- <br /> lines (0. 3 parts per million) . <br /> Based on the test results after the minor modifications, staff is <br /> recommending that the existing plant equipment be retained and <br /> modifications to the plant be made to provide backwash reclama- <br /> tion and automation. A complete report with estimated costs will <br /> be provided at the Council meeting. If the Council concurs with <br /> staff, the bids for filtration equipment should be rejected. <br /> Ri r/ ' in for <br /> City Engineer/Director of Public Works <br /> REC MRPRIPAARTimends that the Council reject the bids for filtration <br /> equipment from Filtronics and Hungerford and Terry. <br />