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aob #000002.00 BISSELL & KARN. INC. <br />January 28, 1988 <br />Page 2 <br /> <br /> We spent much more time than we anticipated in evaluating the <br /> impacts on existing services and developing criteria for allowable <br /> pressure reductions. As a result, we have expended all of our <br /> budget, and an additional $2,300, and have yet to design the <br /> necessary improvements to the individual booster pumps. we would <br /> like to request an extension of our contract in the amount of <br /> $2,300 to cover the extra work done to date. <br /> <br />Work remaining to be done to complete the implementation of the Foothill <br />Pressure Zone is as follows: <br /> <br /> 1. Installation of the check valves. This can be done by City crews <br /> or contracted out. If you require assistance in that work, we <br /> would be glad to provide it on a T&M basis. We cannot estimate an <br /> upper limit for that without discussing what assistance would be <br /> required. <br /> <br /> 2. Additional testing to determine impacts on sprinkler systeM. We <br /> have recoem~ended that the customers that will be impacted (all <br /> those in the area to be shifted from the Foothill Zone to the Lower <br /> Zone) be contacted by the City and that the situation be presented <br /> to them. Then each sprinkler system that might be impacted would <br /> be tested and a determination made as to what improvements or <br /> adjustments would be required. As necessary, these would then be <br /> designed. <br /> <br /> Our existing contract includes the design of residential booster <br /> pumps, but not the testing or design of other improvements. That <br /> work could be done by City staff. If necessary, we could assist on <br /> a T&M basis. <br /> <br /> Based on doing about 8 sites, we estimate that testing assistance <br /> would require 1 to 2 hours per site and that design of booster <br /> pumps or other improvements would require 4 to 8 hours per site. <br /> On that basis, we recommend a budget for engineering fees of <br /> $4,000. <br /> <br /> 3. Design for relocation of Foothill #1 Booster Station. The Foothill <br /> Road main sullying water to this station will be converted to a <br /> Lower Zone pipe, lowering the suction pressure for the pumps. Our <br /> calculations indicate that, while it will be borderline, the pumps <br /> may still operate. We have recommended that a test be conducted to <br /> determine if in fact the pumps will still work with the reduced <br /> suction pressure. If it fails the test, the station would have to <br /> be relocate]. <br /> <br /> Dave Van Houten and Bill Wilkens have indicated that the current <br /> station does not have adequate capacity and should be upgraded <br /> regardless of the need for relocation. <br /> <br />JMD.3.6 <br /> <br /> <br />