Laserfiche WebLink
<br />RMC <br /> <br />~~'t1tt'r ilnd EnlJirOlllrlt'nt <br /> <br />Escondido <br />Irvine <br />Sacramento <br />San Diego <br />San Francisco <br />San Jose <br />Santa Monica <br />Walnut Creek <br /> <br />222 Sutter Street <br />Suite 700 <br />San Francisco, CA 94108 <br />ph:415.321.3400 <br />fax: 415.321.3401 <br />wwW.rmcwater.com <br /> <br />Innovative Solutions for <br />Water and the Environment <br /> <br />EXHIBIT A <br /> <br />October 26, 2009 <br /> <br />Mr. Jimmy Tan <br />City of Redwood City, Senior Civil Engineer <br />1017 Middlefield Road <br />Redwood City, CA 94063 <br /> <br />Subject: Glenwood Pump Station Design <br />Budget Amendment Request for Additional Work Items <br /> <br />Dear Jimmy: <br /> <br />RMC Water and Environment's (RMC) preliminary design analyses and subsequent <br />discussions with the City have resulted in the determination that additions to the <br />Glenwood Pump Station project could improve water system reliability and efficiency. <br />These additional features and analyses were not originally scoped for the project, and <br />RMC is requesting a budget amendment in the amount of $26,100 for these eff0l1s. <br />The additional evaluations would provide the City with valuable insight into how the <br />system could be operated under emergency conditions, and the specific impacts of the <br />potential future reinstatement of the Vista-Oakview Pump Station and Reservoir. <br /> <br />Hydraulic Modeling <br />Total Additional Fee: $8,600 <br /> <br />The original project scope had a limited level of effort for the hydraulic evaluation of <br />the Glenwood Pump Station. The initial evaluation and discussions with City staff <br />detetmined that additional information was needed and that the scope of the hydraulic <br />evaluation should be expanded to a larger area with the benefit of improving the water <br />system reliability and efficiency. <br /> <br />RMC has performed the following additional, out of scope activities related to <br />hydraulic modeling: <br /> <br />1. Confirmed pump station hydraulics using new operational data provided by the <br />City; <br />2. Created a hydraulic model of the Glenwood Pump Station, main distribution <br />pipeline and Lakeview Reservoir; <br />3. Developed a calibration plan for the hydraulic model; <br />4. Calibrated the hydraulic model using the results of fire hydrant flow testing; <br />5. Performed hydraulic modeling under 12 existing and potential future operating <br />scenarios; <br />6. Summarized results and provided recommendations for the configuration of <br />the future system, including the addition of variable frequency drives to <br />maximize the City's flexibility in system operation. <br /> <br />The scope of work and associated fee for these hydraulic modeling tasks was <br />previously agreed to via an email from Phong Du on December 15,2008. <br />