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Water Improvement Design and Coordination. Our utility design team along with our subconsultant, Hazen and
<br />Sawyer have successfully completed water Infrastructure projects for various agencies in Southern California. Those
<br />projects .eonsistof water mein replacement, realignment, upsizing and capacity increase, master planning, existing
<br />system evaluation and maintenance and operational support, Although each project is unique, the majority of chhallenging
<br />utility projects we face areln developed areas where existing utilityyfaoilities are located within the proposed project area
<br />and any improvement will generally effector be affected by ttna location of tho existing utility facility. KlmleyHorn believes
<br />In drawing all utility fines and features true to size in ourplans.to aid in Identifying conflicts early in the design phase. We
<br />will also pothole potential conflict locations when budgets allow, which gives a better understanding of the locations of
<br />the existing tines, and provide extensive coordination with the various utility Companies, We also use 3 D modeling of
<br />utilities to, Identify potential conflicts in.early stages of, design,,Thia rnothod has helped us to avoid discrepancies between
<br />construction documentsand actual field conditions that resulted In cost effective and timely manner execution of projects,
<br />Sanitary Sewer Design, Sewers will be designed based on Orange County Sanitation District and City of Santa Ana's
<br />requirements. All design criteria will his reviewed versus the previous requirements including sewer pipe suing, modeling
<br />and analysts, sewer line alignment and depth, minimum slopes, plpe.matorials, bedding and tronch,design, and raquired
<br />manholes, Klmley-Ham will provide modeling based on assembled Information based an the existing system and
<br />Incorporating proposed oondltloris if requested by the Clay, Results of the mod sling and recommendations by Kloiley-Horn
<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 "static" wafter level downward, The second is a decline In water levels In the
<br />local aquifer caused by continuous pumping, The third Is a decline In specific capacity caused bye plugged filter pack
<br />or well screen. The regional decline In water levels is not controllable and groundwaterlevels will recover through
<br />natural recharge. The reduction in specific capacity requires corrective action in the form of root 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 permeability near the well screen. This type of
<br />permeability reduction is often the result of biological fouling, cementation, or the Intrusion of fine-grained aquifer sand
<br />into rho gravel pack surrounding the well casing. Well videos could confirm this; Migration of fine-grained aquifer sand
<br />could be a roof cause of the rapid decline in specific capacity. The result of this is that water velocity during pumping 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 remove 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 sieve analysis performed to size the filter pack and the daily construction (if available), As part of
<br />developing a mltlgatlon approach, spinner logs may be recommended to verify production zones.
<br />Environmental Studies. Our environmental services team provides complete natural resource regulatory compliance
<br />services for public works 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 drain,
<br />and water resources, They are wall versed in all aspects of the development process from Phase I Environmental
<br />Site Assessments to California Environmental OuaiityAct (CEOA) and National Environmental PolfoyAct (NEPA)
<br />Kimley)))Horn
<br />7ROC77020,171 City of Santa Ann
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