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Water Improvement Design and Coordination, Our utility design team along with bur suboonsultant,.Hazen and Sawyer nave.suDoessfully cdmpieted water infrastructure. projects for various agencies In Southern California, These projects consist of water main replacement, reallgnmant, upsizing and capoolty increase, master planning, existing system evaluation and malntenanciewd; operetionai support,Alihough each project Is unique, the majority of challenging utility projects we face are in developed areas where axlsting utility facilities are located within the proposed project area and any Improvement will generally offset or be affected by the location of th azlsflng ufiiiSy facility, tSimteyHorn believes In drawing all utility lines and features true to size In our plans to all in Identifying conflipts early in the .design phase. We will also pothole potential conflict locations when budgets allow, which gives a better understanding of the locations of the existing lines, and provide extensive coordination' With the various utility Companies, We also use 3=D modeling of utilities to: Identify potential conflicts In early stages of,design, This method has helped us to avoid discrepancies between construction documents.and actual field conditions that resulted in cost effective and timely manner oxecution of projects. Sanitary Sewer Design. Sewers will be designed based on .Orange County Sanitation District and City of Santa Ana's requirements, All design criteria will be reviewed versus the previous requirements including sewer pipe sjztng, Modeling and onslysis, sewer Iine.alignment and depth, minimum slopes, pipe materials, bedding and trenoh design, and.requlred manholes, kimjey-Homwill provide modeling based on assembled Information based on the existing system and incorporating proposed.00nifillons If requested by the City. Results of the modeling and recommendations by KlinleyHorn for project solutions will then be submitted to the City for reviewand approval. Well Rehabilitation Design, A combination of three factors can cause water production decline, The first is a regional decline in water elevations that shift the "static" water level downward. The second is a deoline in water levels In the local aquifer caused by continuous pumping, The third Is a decline In speotflo capacitg:caused by plugged filter pack or well screen. The reglonal decline to water levels is not controllable and groundwater levels will recover through natural recharge. The reduction in specific, capacity requires corrective action in the form of root cause evaluation, well redevelopment, and possibly modification to pump location and flow rate. The decline In specific capacity could be a rest It of a reduction of permeability near the well screen. This type of permeability reduction is often the result of biological fouling, cementation, or the Intrusion of fine-grained aquifer sand Into the gravel pack surrounding the well casing. Weil videos could confirm thla-Migration of fine-grained aquifersand could be a root cause of the rapid decline in specific capacity. The result of this is that water velocity during pumping Is much higher in those sections of screen that produce the most water, During pumping, small sand particles mobilize. and migrate through the well filter pack and wedge Into the pore space, reducing permeability in the finer pack. Mitigation of this Issue would include careful well development to remove the sand and resettle the flitter pack and modification of pumping operations to reduce sharp changes in water velocity that mobilize fine-grained aquifer sand. Prior to redevelopment it ls.recommanded to review of the factors that can cause this reduction In specific capacity.. The review would include assessment of biological and cementation plugging and review the original, well construction documents including the sieve analysis performed to size the filter pack and the daily construction (if available), As part of developing a mitigation approach, spinner logs may be recommended to verify production zones. Environmental Studies, Our environmental services team provides complete natural resource regulatory compliance services for public works projects. Our environmental professionals have provided services for a wide variety of projects, Including roadway, transit, transportation planning, green streets, complete streets, land development, storm drain, and water resources. They are welt versed In all aspects of the development process from phase I Environmental Site Assessments to California Environmental Quality Act (CEQA) and National Environmental Policy Act (NEPA) Klmley>Morn 7ri0C7702B. f71 City of annin Ann