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Mitigation of this issue would include careful well development to remove the sand and resettle the Ili ter 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.recommonded 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 filler pack and the dally construction (if 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 complete natural resource regulatory compliance
<br />services for public works protects. Our environmental professionals have provided services for a wide variety of protects,
<br />including roadway, transit, transportation planning, green streets, complete streets, land development, storm drain,
<br />and water resources. They are well versed In all aspects of the development process from Phase I Environmental
<br />Site Assessments to California Environmental Quality Act (CEQA) and National Environmental Policy Act (NEPA)
<br />Kimley »> Horn a THO077025,171 City or Sante Ana
<br />25E-98
<br />f'
<br />Water Improvement Design and Coordination. Our utility design team along with our•subcomsultant, Hazen and
<br />�{t'
<br />Sawyer have successfully, ddmpleted water Infrastructur& protects for varlous egoifoles in. Southern California. These
<br />projects consist of water main replacement, realignment, upelzing and copsoityincrease, master planning, existing
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<br />system evaluation and malntemagoe,and; operaflonateupport.Although each protect Is unique, the majority of challenging
<br />utility projects. we face are In developed areas where exiisting utility facilities are located within the proposed protect Area
<br />k
<br />and any Improvemont will generally effort or he atfaeted.by the 1poafion of lite ax(Ist ngutpfty facility, KirriaMorn pelioves
<br />In rtrowing all utlllty lines and features true to size in our plans to aid In identifying conflicts early in tho 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 lines, and provide extensive coordination' With the various utility Companies. We also use -3=D modsling bf
<br />utilities to Identlfy potential conflicts in early stages ofdaslgn, This method has helped us to avoid discrepancies between
<br />construction documents.aod Actuatfield condlffons that'resulted to cost effective and timely manner oxecuticn of projects.
<br />Sanitary Sawar Rosigh, Bowers will be designed based on :Orange County Sanitation District and City of Santa Ana's
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<br />regulrements. All design crlfarfa will be reviewed versus the:provlous requirements including sewer pipe alzing, modeling
<br />and analysis,aewer lino aggnment and depth, minlmum slopes, plpa-materlals, bodding and french design, ondraqulred
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<br />manholes, Kimtay�Hornwill provide modeling based on assembled information based on the existing system and
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<br />incorporating proposed conditions It requested by the City. Results of the modeling and recommendation$ by Ktmley-Hom
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<br />for protect solutions will then be submitted to the City for review and approval,
<br />Well Rehabilitation Design, Acombination of three factors can cause water production decline. The first is a regional
<br />decline In Water elevations that shift the °statfa°` water level downward. The second Is a decline In avatar levels In the
<br />local aquifer caused by continuous pumping, The third Is a decline In specific oapaoftycaused by a plugged filter pack
<br />or well screen. The roglonai.doeilne in water levels is not controllable and groundwater levels Will recover through
<br />natural recharge, The reduction In speciFlc capacity requires corrective action In the form of root cause evaluation, well
<br />redevelopment, and possibly modification to pump location and flow rate,
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<br />The decline in spooiflo capacity could be assault of a reduction of pormaabiifty near the well screen. This type of
<br />permeability reduction is often the result of blologloal fouling, cernontstion; or the Intrusion of fine-grained aquifer sand
<br />r
<br />Into Iha.gravol nook surrounding the Bali casing. Well videos could confirm this, Migration of fine-grained aqulfersand
<br />could be a root cause of the rapid decline in specific capacity. The result of this is that water voloohy during pumping is
<br />much %horin those sections of screen that produce the most water, During pumping, small send particles mobilize. and
<br />a
<br />migrate through thewell fiilerpaek and wedge intothe pore apace, reducing permeability in the flier pack.
<br />Mitigation of this issue would include careful well development to remove the sand and resettle the Ili ter 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.recommonded 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 filler pack and the dally construction (if 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 complete natural resource regulatory compliance
<br />services for public works protects. Our environmental professionals have provided services for a wide variety of protects,
<br />including roadway, transit, transportation planning, green streets, complete streets, land development, storm drain,
<br />and water resources. They are well versed In all aspects of the development process from Phase I Environmental
<br />Site Assessments to California Environmental Quality Act (CEQA) and National Environmental Policy Act (NEPA)
<br />Kimley »> Horn a THO077025,171 City or Sante Ana
<br />25E-98
<br />
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