03-19-1983 WS - Laserfiche WebLink

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Maintenance Program The water system has 4 main components; 1) wells, 2) treatment plants, 3) storage tanks and 4) distribution system. The design life of the various components range from 10 to 15 years for a pump or motor to 30 to 40 years for watermains and storage tanks. Studies by the American Society of Civil Engineers, the Water Pollution ControlFederation, the Water Research Center and the Transport and Road Research Laboratory of the United Kingdom have shown that early identification, correction and salvage of existing structures results in long term cost savings. It has been shown deterioration of a utility system escalates rapidly if left unchecked by regular inspection and maintenance. Studies have shown that planned maintenance will sifnificantly reduce annual maintenance costs when compared to emergency repair, cost when a major component fails. Using as an example the 1982 service and repair costs for well No. 5, the following conclusions can be drawn: a) If the pump and motor had been serviced 5 to 7 years after initialconstruction, the repair costs could have been as low as $5,100. b) Actual costs for repairs affected after 11 years of use were $8,339. c) Possible net savings $3,239. d) If a 21 to 22 year life cycle is assumed, then per item (a) above, the total repair costs would be $15,300 (service every 7 years or 3 l times in 21 years). e) If a 21 to 22 year life cycle is assumed, then per item (b) above, thetotalrepaircostwouldbe $16,680 (service every 11 years or 2 times in 22 years). f) Net life cycle cost savings of $1,380. The recommended maintenance schedule for the water system components is as follows see figure 4): 1) Wells - service and inspect one well per year or each well once every 7 years. (This anticipates that a new well will be constructed in the northeast part of Mounds View.) 2) Treatment Plants - inspect and clean filters every 3 years or one plant per year. Filter tanks should be cleaned and painted once every 12 to 14 years. 3) Storage Tanks - inspect and clean tanks every 3 years or 1 tank per year. Storage tanks should be painted and/or repaired once every 12.to 14 years. I 4) Distribution System - forty hydrants should be serviced per year. This would allow all hydrants to be serviced once every 10 years. Ten valves should be serviced or replaced per year. Six hundred lineal feet per year of watermain should be repaired and/or cleaned using chemical treat- ments or inserting mechanical devices in watermain. 9