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St. Jude Requirements <br />The fire flow parameters determined by the designers for the St. Jude facility (2,000 gpm <br />@ 20 psi) were beyond the capability of the existing water system in the area. <br />Specifically the network of small watermains coupled with the distance from the water <br />tower and the elevation of the new site, could not supply enough water to provide <br />adequate fire protection for the building. <br />Analysis of Options <br />Short of lowering the ground elevations in the southwest corner of the City there are <br />several ways to increase the water pressures and available flows. These include a trunk <br />watermain loop, a water tower, and booster stations. The booster station option was <br />eliminated as it would require that a section of the current City water system be isolated <br />from the overall system creating dead end mains in the City and it would have the <br />highest maintenance and operation costs. Therefore, two options were extensively <br />reviewed for providing adequate water and pressure to the St. Jude facility. The first <br />was to construct a 12" watermain loop through the area from the existing 12" watermain <br />on the west side of the Canadian Pacific Railroad to the east. The second was to <br />provide a single 12" stub to the area and to construct a new water tower near Rice Street <br />just south of the Capital View School. <br />The 12" watermain loop is the least expensive of the options for providing the necessary <br />water to St. Jude and with some additional water system connections provides benefit to <br />the entire area at an estimated cost of approximately $600,000 to $700,000. The tower <br />option would allow only one half of the 12" watermain loop to be installed but due to the <br />tower construction would have an overall increase to a total cost of approximately <br />$1,200,000 to $1,300,000. A comparison of the existing system, 12" loop, and new <br />water tower systems is shown below. The expected static system pressures and the <br />available fire flows at maximum day use for several areas is provided below based on <br />two water levels in the tower. The water elevation of 1045 would be near the low level of <br />the tower and the 1055 represents a level close to the middle of the operating range of <br />the tower. <br />Location <br />Tower Water Elevation 1045 <br />j Tower Water Elevation 1055 <br />Existing <br />Loop <br />Tower <br />Existing <br />Loop <br />Tower <br />Static <br />(Psi) <br />Fire <br />Flow <br />(9pm) <br />Static <br />(psi) <br />Fire <br />Flow <br />(gpm) <br />Static <br />(psi) <br />Fire <br />Flow <br />(gpm) <br />Static <br />(psi) <br />Fire <br />Flow <br />(gpm) <br />Static <br />(psi) <br />Fire <br />Flow <br />(gpm) <br />Static <br />(psi) <br />Fire <br />Flow <br />(gpm) <br />New St. <br />Jude <br />n/a <br />n/a <br />42 <br />2000 <br />44 <br />2000 <br />n/a <br />n/a <br />47 <br />2000 <br />48 <br />2000 <br />Rice /82 <br />30 <br />900 <br />31 <br />1500 <br />33 <br />2000 <br />35 <br />1200 <br />35 <br />1900 <br />27 <br />2000 <br />North of <br />Aldi <br />Foods <br />28 <br />800 <br />29 <br />1800 <br />31 <br />2000 <br />33 <br />1100 <br />33 <br />2000 <br />36 <br />2000 <br />Rice / <br />Minnesota <br />34 <br />900 <br />35 <br />1900 <br />37 <br />2000 <br />38 <br />1200 <br />39 <br />2000 <br />41 <br />2000 <br />Stephanie <br />Court <br />33 <br />400 <br />34 <br />1700 <br />36 <br />2000 <br />37 <br />500 <br />38 <br />2000 <br />40 <br />2000 <br />End of <br />Stephanie <br />Circle <br />37 <br />500 <br />37 <br />900 <br />39 <br />1000 <br />41 <br />600 <br />42 <br />1000 <br />44 <br />1100 <br />10062 Flanders Court NE — Blaine, MN 55449 — Ph: (763) 780 -0450 Fax (763) 780 -0452 <br />Memo - 100407 -CC (City Water System Improvements) <br />2 <br />