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� , <br /> �Of• fc�a <br /> C <br /> V 7� <br /> '/[LINO�Y <br /> September 29, 1998 <br /> PUBLIC WORKS MEMORANDUM <br /> NO. 98-61 <br /> MEMORANDUM TO: Honorable Mayor and City Council <br /> FROM: James L. Williams Jr. Ci Mana er <br /> > > tY g n _ <br /> Bruce A. McNabb,P.E.,Director of Pu61ic Works��*`� <br /> Stephen P. Swanson,P.E., City Engineecc� <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 a substantial percentage of the <br /> City's sewer system is unknown as only an estimated 20 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 problem <br /> areas. 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. The problems may be the result of age, design, poor <br /> construction, disturbance by other nearby work, trees being planted or taking root over or near <br /> sewers, and/or chemical reaction to flows and gases in the pipe. <br /> The need to have good 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 staffs "best guess estimate" based on very limited information. The typical method of <br /> obtaining this information is by the use of video camera and videotaping equipment. This method <br /> enables a considerable amount of information to be recorded about the interior condition of <br /> sewers, especially small diameter sewers that cannot be walked or crawled through by an <br /> inspector. The information obtained is used by staff to develop sewer maintenance, repair and <br /> rehabilitation programs. <br />