Laserfiche WebLink
f <br />ON -CALL ENGINEERING SERVICES <br />Key Destgn Issues <br />The following are some of the key design Issues we envision that will be required to be <br />G <br />performed during the oxecut.lon of the sample project. We believe TotraTech has sin excellent <br />grasp of these issues based on our overall design experience as well as the knowledge we <br />01 <br />have golne.0 from our similar well design:projeots, Including Well No. 32 Rehabilitation for the <br />C) <br />City. Our approach to resolving project Issues Is Summarized below* <br />SUMMARY OF KEY ISSUES <br />Issues Tetra Tech Approach <br />-company <br />Well)?ehabilitation Recommend City contract with a well rehablWon to. <br />conduct initial Inve6tWatorY operations on well (olmllario, Well U). <br />-work. <br />Propa.roexhlbits for existing well rehabilitation <br />Assume that o full casing liner will noel to be Installed, <br />0 <br />May hoad how pump. and m clor due to IlNer, <br />4ift Moidit'lo-atto he Determine anticipated flow and specific Capacity after rehab, <br />01 <br />Evaluate pump and motor based on wall rehabilitation. <br />�valwato pump and motor based on pumping to distribution <br />system Instead of existing onpite roservoir; <br />0 <br />Determine if ondito sodium h�pochlorlta generation facilities are <br />required to pump diroofly Into distribution System.' <br />CJ <br />Evaluate pump to discharge due to pvrpping directly Into <br />0 <br />distribution system. <br />Evaluate Impacts to site layout, mechanical, piping, oloctrical <br />required to:c4gAne operation of well, <br />0 <br />Pipeline Design Recommend seop of work for pipe ne: pot 0 ng; geotechnicat; <br />traffic control, CEQA; SWPPP-, permitring; old. <br />City street requirements (working hours, lans closures, p(c). <br />Utility coordination, traffic control, and constructlon phasing, <br />Perform alignment selection, <br />- lze <br />Coordination moOlfioaflona (u motor). <br />. Coordination with City on any site and building mo.. filications. <br />* Assist City In public outreach program. <br />Trait lo managempn(plaq, 4nd.00rrepponding traffic control plans. <br />Pennitfing - Renderings of any building exterlW�6& I'ditions for revt, w and <br />approval by Planning and Building Division. <br />. Street, building and electrical permits willtake multi -reviews and <br />uJ <br />Will be time consuming. Allow for In schedule and budget for Costs <br />..... . ........ . . <br />The following Is a more detailed summary of our approach for some of the above key issues. <br />Well Rehabilitation <br />-Y <br />Wall 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 lose$ Its ability to <br />.J <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 16 to <br />25% 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 />CifyofftnIoAns a. TETRA TECH <br />25E-1 73 <br />