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f ' . <br /> oF'DFc <br /> � ��9� <br /> � <br /> ��� <br /> �:�:�� <br /> '/[LINO�`'� <br /> July 24,2000 <br /> PUBLIC WORKS MEMORANDUM <br /> NO. 2000-55 <br /> MEMORANDUM TO: Honorable Mayor and City Council <br /> FROM: Steve Garm�_ ity Manager � <br /> Bruce McNabl�, P.E., Director of Public Works <br /> Stephen Swanson, P.E., City Enginee�� <br /> SUBJECT: Annual Sewer Television Inspection Program <br /> The City Sanitary Sewer Collection System consists of an estimated 362 miles of pipe <br /> ranging in diameter from 8 inches to 84 inches. The condition of much of the City's sewer <br /> sanitary system is unknown as only an estimated 60 miles of sewer has been inspected. This <br /> limited amount of inspection has been done by the use of video equipment and/or by inspectors <br /> entering the sewers to view and record the condition of the sewers. Information obtained from <br /> these inspections is used to develop sewer repair and rehabilitation programs to correct problems. <br /> Problems typically found include sewers that need to be cleaned or derooted; collapsed <br /> sections of pipe; separated pipe joints; cracked pipe; settled or heaved sections of pipe; <br /> deteriorated sections of pipe; etc. Problems can result from age; design; poor construction; lack <br /> of maintenance; disturbance by other nearby work; roots from trees planted over or near sewers; <br /> other utilities that have bored into or through the City's sewers; and/or chemical reaction to flows <br /> and gases in the pipe. <br /> The need for accurate information about the condition of the City's sanitary sewer system <br /> was identified by the Department of Public Works. This information is needed to determine the <br /> extent of the system's repair and rehabilitation needs and the corresponding funding needs as <br /> opposed to staff s "best guess estimate" based on limited information. The standard method of <br /> obtaining this information is through the use of a video camera and videotaping equipment. This <br /> method enables a considerable amount of information to be recorded about the interior <br /> conditions of a sewer, especially smaller diameter sewers that cannot be walked or crawled <br /> through by an inspector. The information obtained is used by staff to develop sewer <br /> maintenance, repair and rehabilitation programs. <br />