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, <br />INTRODUCTION <br />Bowker & Associates, Inc. is pleased to present this proposal to conduct a technical evaluation of <br />the existing odor control systems at the North Olmsted WWTP, and to develop detailed <br />recommendations to modify and upgrade these systems to be consistent with state-of-the-art wet <br />scrubbertechnology. <br />We have reviewed the Request for Proposals and, based on the scope of work delineated in that <br />? document, have prepared the following technical approach, estimated cost and schedule to <br />complete the work in a timely and professional manner. - <br />? <br />PROJECT UNDERSTANDING <br />Bowker & Associates, Inc. has reviewed the information compiled by the City of North Olmsted <br />on the odor control systems in operation at the wastewater treatment plant. Based on review of <br />this information and discussions with Mr. Dennis Long, it is apparent that the systems have <br />undergone significant modifications, and in some cases are no longer handling the same odor <br />sources that they were designed to treat. <br />The wet scrubbers were installed in 1985 and the design reflected state-of-the-art conditions that <br />? existed over 15 years ago. Although several modifications have been made, the current method <br />of controlling chemical feed rates is somewhat unreliable, and "odor excursions" occasionally <br />? occur that result in off-site odor impacts. These excursions resuit from the scrubber's inabilitY to <br />? respond to changes in loading caused by process operational changes or upsets. <br />Because of the relatively high air flowrates through the systems and the potential for high inlet <br />concentrations of difficult-to-treat reduced sulfur compounds, any reduction in performance <br />efficiency can lead to possible odor complaints from neighboring residents. Therefore, it is <br />important to upgrade these systems to be consistent with 2002 technology.