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Water Improvement Design and *Coordination. Our utillti.dasign team along with our guboonsult4rit, Hazen and
<br />Sawyer have. successfully completed water Infrastructure projects for various agencies In Southern California. These
<br />pPolects consist Of water main replacement, realignment, upsizing and capacity Increase, master plarloing, existing
<br />system Mluatli)n and maintenance arid operational support, Akhough each project Is unique, the majority otchollonglog
<br />Utility PM]Qds we face Oro In developed areas where existing Utility facilities are located within tho proposed project area
<br />and any Improvemon(will generally effector be affected by the location of 1haoxisting 0011tyfliolfity, k1mley-Horil believes
<br />In drawing all utility lines and features true to size In our Mons to aid In Identifying conflicts early In the deal nphqse.We
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<br />will also pothole potential conflict locations when budgets allow, which gives a bettor understanding of the locations of
<br />the existing lines, and provide extensive o0ordinatloh.with the Vatlous Utility companies. We also use M modeling of
<br />ulffIlles to, Identify potential conflicts In,early stages oftlesign,Thlableithod too helped us to avoid discriopanclea between
<br />consitruotion documonts�and actual field conditions that resulted in cost effective and fimoly manner oncullon of projects,
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<br />Sanitary $ewer Dirsigh, Sowers will be designed based onDranggi COUNY 6601tetUff District and City of Santa Ana!s
<br />requirements, All design criteria will be reviewed versus the previous requirements Including sower pipe alking, modeling
<br />and arialyals, sewer line:411i;inniont and depth, minfrourn slopes, 01pa materials, bedding and tronchilesIgn, andraquIred
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<br />manholes. Kimley-Hom will provide modeling based on Assembled Inficrovation based on the existing system,and
<br />incorporating proposedoondillop If requested by the, Oily, Results of the modeling and recommendations by Kimiloy-Hoin
<br />for project solutions will then be submitted to the City for review and approval.
<br />Well Rehabilitation Design, A combination of three factors can cause water production decline. The first is a regional
<br />decline In water elevations that shift the %tatld' water level downward. The second Is a decline In water levels In the
<br />local aclulfor caused by continuous pumping. The third Is a decline In SpOicIfic capacity caused by a plugged filter pack
<br />or well screen. The re0ional.doollne In water levels Is not controllable and groundwater levels will recover through
<br />natural recharge, The reduction In specific capacity requires corrective motion In the form of toot cause evaluation, well
<br />redevelopment, and possibly modification to pump location and, flow rate.
<br />The decline In specific capacity could be a -result of a reduction of pormeablilty near the well screen. This type of
<br />permeability reduction Is often the result of biological fouling, cementation, or the intrusion of foe -grained aquifer sand
<br />intotho gravel pack surrounding the well casing. Well videos could confirm this.: Migration of fine-grained aquifer sand
<br />could be a root cause of the rapid decline, In specific capacity, The result Of this Is that water velocity during puraping Is
<br />much higher In those sections of screen that produce the most water. During pumping, small sand particles mobilize and
<br />migrate through the well filter pack and wedge Into the pore space, reducing permeability In the filter pack,
<br />Mitigation of this Issue would include careful well development to removia the sand and resettle the filter pack and
<br />modification of pumping operations to reduce sharp changes In water velocity that mobilize fine-grained aquifer sand.
<br />Prior to redevelopment It Is recommended to review of the factors that can cause this reduction In specific capacity.
<br />The review would include assessment of biological and cementation plugging and review the original, well construction
<br />documents Including the sleve analysis performed to size the filter pack and the daily construction tif available), As part of
<br />developing a mitigation approach, spinner logs may be recommended to verify production zones.
<br />Environmental Studies, Our environmental services team provides �omplata natural resource regulatory compliance
<br />services for pubileworks projects, Our environmental professionals have provided services for a wide variety of projects,
<br />including roadway, transit, transportation planning, green streets, complete streets, land development, storm draln,
<br />and water resources, They are well Mad In all aspects of the development process from Phase I Environmental
<br />SIteAssessmonts to California Environmental Quality Act (CEQA) and National Environmental PollcyAct (NEPA)
<br />Kimley>Worn a TROO77025,171 city of Santa Am
<br />25E-23
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