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f, <br />! <br />ON-CALL ENGINEERING SERVICES <br />Wstar Hasourcae-4MfmA <br />�� <br />Key Design Issues <br />The following are some of thekey design issues we envision that will be required to be <br />performed duringthe execution of the sample project. We believe Tetra.Tech has sin excellent <br />grasp of these issues based on our overall design experience as well as the knowledge we <br />1 <br />have gained from our similar well design projeots, including Well leo. 32 Rehabilitation for the <br />C) <br />City. Our approach to resolving project issues Is summarized below: <br />�� rt <br />SUMMARY OF KEY ISSUES <br />Issues Tetra Tech Approach <br />teff )?ehab7/ltat/on ' , Recommend City contract with a well rehabliitation -company to. <br />conduct initial Investigatory operations on well (olmliarta Well 32). , <br />a Prepare.exhibitsfor existing _well rehabilitation wofk. <br />�r <br />• .Assume that a full casing liner will need to be installed, <br />0 <br />• .May hoed hew pump. and motor due to liner, <br />+ Evaluaiq options of well water dlsoh�s during testing„{NPD,ES). ,. _ <br />iff Moalfff t%ns Determine anticipated flow and specific Capacity after rehab, <br />01 <br />+ Evaluate pump and motor based on well rehabilitation. , <br />• .evaluate pump and motor based on pumping to distribution <br />system Instead of existing onsite reservoir: <br />0 <br />Determine if onsite sodium hypochlorite generation facilities are <br />required to pump directly Into distribution system. <br />C..) <br />Evaluate pump to discharge due to pumping directly into <br />0 <br />distribution system. <br />• Evaluate impacts to site layout, mechanical, piping, olsctrical <br />m_asffftaetions_ required to c4gAn eoperation of welt,....... <br />0 <br />Pipeline Design Recommend seopr3 of work for pipe8ns pot nbling; geotechnicat; <br />f <br />traffic control; CEQA; SWPPP; permitting; oto. <br />• City street requirements (working hours, lane closures, e(c). <br />4..) <br />• Utility coordination, traffic control, and construction phasing, <br />t <br />Perform alignment selection. <br />__ ... <br />CoordinationSCE coordination forfor any el®ctrloai modlfioaflona (upsize motor). <br />• Coordination with on any site and building modifications. <br />.City <br />Assist City in public outreach program. ; <br />;. <br />t' <br />Trait lo management_plan and oorres-ponding traffic_ control plans. - <br />Permitting • Renderings of any building extei for m6&I'dations for review and <br />approval by Planning and Building Division. <br />i <br />• Street, building and electrical permits will take multi reviews and <br />Will be time consuming. Allow for In schedule and budget for costs <br />n <br />coordingly..9tartoarlyand,dooument,pverything.....__---_._.__..._ <br />The following is a more detailed summary of our approach for some of the above key issues. <br />f <br />Well Rehabilitation <br />h <br />Wail rehabilitation Is frequently a necessary down -well process to Improve the efficiency and <br />pumping capacity, and to extend the longevity of existing water -supply wells, Generally, a well <br />may require rehabilitation for several observed conditions, including; the well loses Its ability to <br />.J <br />pump at Its former rate, or at this rate at which it was originally placed online, or it ceases to <br />pump at all; the specific capacity of the well declines considerably, generally greater than 16 to <br />36% of its original value from the date of well construction; the pumping water level in the well <br />J <br />has declined either rather quickly or over a longer period, during which the pumping rate and the <br />g <br />Clry of 3anro Ane a • TETRA TECH <br />25E-173 <br />`' <br />