CCP 06-10-1996 - Laserfiche WebLink

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. I . CITY OF ARDEN HILLS MEMORANDUM I -- DATE: June 5, 1996 TO: Brian Fritsinger, City Administrator I FROM: Dwayne 'Stafford, Public Works Superintendent ~ SUBJECT: Sanitary Sewer Evaluation I Background I According to the sewer and water plans the City has on file, a large portion of our sanitary sewer system was constructed approximately 35 years ago, Properl)' installed systems can last a I hundred years or more, however, 35 years ago work ethics in sewer construction stressed mostly quantity. One of the key ingredients to a good sewer line is compaction in the pipe zone just after the pipe is laid, If there are voids under the pipe and back filling occurs or a rock rolls I down on the pipe it may break, or it may settle later and break. Unlike newer plastic sewer lines, clay lines are as brittle as glass, At the time these pipe were laid, pressure testing sewer lines was unheard of, as the type of joint used in those days would barely keep dirt out of the line. I Todays joints which can be pressure tested, are virtually water tight. Televise eI The Public Works staff would like to start a program of systematically televising our entire sanitary sewer system, This could be setup on a three (3) year program, possibly looking at the oldest areas first. The main concerns would be ruptured pipe where the possibility of collapse I exists and infiltration which surely exists and costs the City thousands of dollars yearly treating clean water. Recommendation I The Public Works staffrecommends that the City obtain bids from television inspection I contractors who would provide a complete report on the condition of each segment similar to the enclosed report, These reports could then be analyzed by the Public Works staff and appropriate repairs scheduled. This program could be started in the Spring of 1.997, giving staff time to I budget monies for it. Any streets receiving reconstruction would automatically be televised as part of the engineering of the street. Costs I The City of Arden Hills has approximately 200,000 feet of sanitary. sewer pipe in place, Televising one third (1/3) of the City each year for three (3) years would cost the City I approximately $20,000 per year. The Public Works Staff would also recommend the City budget $25,000 per year for repair of identified problem areas until this project is completed. I .. I