8A Inflow and Infiltration Update

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I&I 6/5/2008 Page 2 Lift station monitors: Pump station monitors were insialled at Lift Stations 11 and 13 on Apri121, 2408 to further break down t�e metershed to MCES meter 059 (on Wesi Round Lake Road). At the May 12`�' Cify Cauncil Meeting Chuck Janski showed an example of the data tl�at these monitars are collecting. On May 30, 2008 the pump siaiion monitor that was installed on lift siaiion 13 was moved to Iift station 4. Weekly data from these manitors is being reviewed by Bonestroo. Ternpora.ry flow metersT Two flow meters were installed Wednesday, May 14. We anticipate the meters will be in place for four to six weeks, depending an the weather. The �net�rs need to zxionitor "nortnal flaw" and "high flow". High flow occurs when we receive signiiicant rain events. However, if we have a drier than normal period, the length of time the meters are in place may need to be extended. To date there has noi beEn a significant rain event to review iar "high flow". Smoke testin�: Smoke testzng is recommen�ed to occur in the sumniEr, after the streeis are swept and catc� basins are cleared of leaves and debris. This allows the smoke to be mare visible to those ca�npleting the tesiing. Staff �s working with Bonestroo to coordinate this work. In discussing priorities for 2008, stafi and Bonestroo believe rnanhole rehabilitation is a higher priarity than smoke tesiing. This item may be moved to the work plan for 2009. At this tiane, the consultant recommends the following areas be included in sanoke testing: the area flowing to the Glenarden neighborhood (proposed 2009 PMP), and the area flowing to Lift Station #11 {northwest corner of the City.) Staff will keep the Cauncil updated on the schedule far smoke testing. Sanita Sewer televisin : Staffls goal is to clean a�d televise approximately 30,040 feet (5.7 miles) in 2008. Areas to be televised: In 2008, staff is focusing on televising sewer lines in low ar�d/or wet areas, especially near ditch systems and lakes. 23,500 feet (4.5 miles) o#'televising is planned around Round Lake, Lake Johanna, along Highway 10, and in the Vaientine Avenue neighborhood (between Lake Valentine Road and 694.) Once these areas have been televised, staff will continue to work on other areas of the City left to be televised To date we have cleaned approximately 17,540 feet and televised approximately 9,200 feet. Manhole ins �ction: We have identif ed three areas in the City for manhole inspections in 200$; 165 manholes are iocated in these areas. This wark is anticipated to be complete by mid J�une, To date we have comple�ed 11 S oithe 165 manholes for 2008. When the 2008 inspections are cornplete, approximateiy three quarters of the Citiy's manholes wili have been inspected. As we gather additional information from other analysis such as flaw mefers, staff will i�entify the priority areas where manhole inspections should be compleied next.