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F <br />ON -CALL ENGINEEANG SE%viors r <br />Water Resqurcea^ Opllan A E <br />Key Design Issues <br />The following are some of the key design Issues we envision that will be required to be <br />performed during the execution of the sample project, We believe Tetra Tech has an excellent <br />grasp of these issues based on our overall design experience as well as the knowledge we <br />have gained from our similar well design projects, including Well No. 32 Rehabilitation for the <br />City. Our approach to resolving project Issues is summarized below: <br />SUMMARY OF <br />—Issuei— :1 <br />Tetra Tech lApproach <br />' <br />Wall Pehabilitetion Recommend City oontract with a well rehabilitation company to <br />conduct initial Investigatory operations on well (similar to Well 32). <br />Prepare exhibits for existing well rehabilitation work.' <br />Assume that a full casing liner will need to be Installed. <br />° <br />+ May need new pump and motor :due to liner. <br />+ Evaluatq options of well water d soharge during testing (NPDES). <br />.'tr <br />Weft Pomodlflcations • Determine anticipated flow and specific Capacity after rehab. <br />�. <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 />� <br />� � <br />• Determine If onsite sodium hypochlorlte generation facilities are <br />required to pump directly into distribution system. <br />D <br />• Evaluate pump to discharge clue to pumping directly into <br />distribution system. <br />Evaluate impacts to site layout, mechanical, piping, electrical <br />modifications to chan of <br />Pipeline Design + wor mitteng;nitcwel6 <br />cd R000mmend see 0 of work for r elh,®; otholing; geotechnical; <br />ame control; CEQA;fpe <br />• City street requirements (working hours, lane closures, etc). <br />i. <br />• Utility coordination, traffic control, and construction phasing. <br />• Perform alignment selection. <br />Doordlnation • SCE coordination for any electrical modifications (upsize motor). <br />• Coordination with City on any site and building modifications. <br />+ Assist City in public outreach program. <br />+ _Traffic managementplan and corresponding traffic control plans,_ <br />Pannitting Renderings of any building exterior modifications for review and <br />approval by Planning and Building Division. <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 />.accordingly. Start carly_and document everything,_, <br />The following Is a more detailed summary of our approach for sorne of the above key issues. <br />Well rehabilitation <br />Well 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 />pump at its former rate, or at the 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 15 to <br />25% of its original value from the date of well construction; the purnping water level in the well <br />has declined either rather quickly or over a longer period, during which the pumping rate and the <br />_ <br />City of Santa Ana -.8 - TETRA TECH <br />