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Ci of Noi~h Olmsw~ed <br /> <br />Ralph H. Bohlmann, Director <br />Department of Public Service <br />Paul W. Deichmann, P.E. <br />City Engineer <br />January 10, 1997 <br />Orris Albertson <br />Enviro Enterprises, Inc. <br />P. O. Box 65312 <br />3605 South West Temple <br />Salt Lake City, Utah 84165-0312 <br />Subject: Request for Proposal for Professional- Services Regarding Aeration <br />Process Evaluation of the North Olmsted Wastewater Treatment <br />Plant <br />Dear Mr. Albertson: <br />Ed Boyle, Mayor <br />Phone: (216) 777-8000 <br />The purpose of this letter is to request three copies of a draft work plan and a technical <br />and cost proposal for: <br />1. An evaluation of the existing single stage activated sludge aeration unit process <br />currently in operation at the City's wastewater treatmept plant; and <br />2. A report documenting the aeration unit process evaluation and containing any <br />recommendations for future capital and non-capital improvements which may reduce <br />the periodic excessive growth of Nocazdia, Type 021N and Microthrix parvicella <br />bacteria in aeration unit process. <br />An aeration unit process evaluation is being requested at this time since the WWTP has <br />been in operation for one and one half years following a $2.8 million improvement. The goal of <br />the 1995 improvements were to bring the plant into compliance as quickly as possible and to <br />eliminate the excessive operation and maintenance problems of the aeration unit process. This <br />goal was met by the following design objectives: <br />1. Eliminating the continuous low Dissolved Oxygen (DO) conditions in the aeration <br />unit process; <br />2. Providing reliable and controllable aeration blower operation and control; <br />3. Providing 50 percent more final clarification capacity; and <br />4. Eliminating poor final clarification solids/liquid flow splitting. <br />I1~ <br />~•r <br />5200 Dover Center Road <br />North Olmsted, Ohio 44070 <br />.~,~,r <br />.,,.~~., <br />