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PROPOSAL <br />On -Call Water Resources Engineering Services <br />RFP NO.: 19-100 <br />this. Migration of fine-grained aquifer sand could be a root cause of the rapid decline in specific <br />capacity. The result of this is that water velocity during pumping is much higher in those sections <br />of screen that produce the most water. During pumping, small sand particles mobilize and migrate <br />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 <br />the filter pack and modification of pumping operations to reduce sharp changes in water velocity <br />that mobilize fine-grained aquifer sand. Prior to redevelopment it is recommended to review of the <br />factors that can cause this reduction in specific capacity. The review would include assessment of <br />biological and cementation plugging and review the original, well construction documents including <br />the sieve analysis performed to size the filter pack and the daily construction (if available). As part <br />of developing a mitigation approach, spinner logs may be recommended to verify production zones. <br />Water Quality and NPDES. Our approach to designing the public works project's components is to <br />preserve or improve water quality by utilizing latest technology available for Low Impact Development <br />(LID) projects. The project team is very familiar with the Los Angeles County Public Works process <br />for storm drain review, and water quality requirements set by regional water board. In addition, our <br />comprehensive green street knowledge and experience will influence our stormwater design. Our <br />proven green street and LID installations will inspire our design and help us deliver a practical and <br />sustainable stormwater management system to the City. <br />Erosion Control and SWPPP. Kimley-Horn's professionals have extensive experience in the design of <br />erosion control and water pollution control projects in Southern California and across the country. Our <br />key staff have been responsible for planning and designing erosion control features, scour mitigation <br />measures, flood control channels, and flood proofing of existing structures. Supported by strong <br />technical investigations, the Kimley-Horn team provides design of erosion control features using a wide <br />range of systems and approaches for levees, channels, embankments, and bridge abutments. As part <br />of the engineering plan review or individual environmental documents review, Kimley-Horn's certified <br />Qualified SWPPP Developer (QSD) engineers will provide the support to review the project's <br />environmental documents including the Water Quality Management Plan (WQMP), Storm Water <br />Pollution Prevention (SWPPP) and Water Pollution Control Plan (WPCP). <br />Storm Drain Design and Drainage Analysis. Kimley-Horn's drainage engineering services include the <br />design of canals; detention basins; culvert crossings; <br />water control structures; diversion structures; pump <br />stations; and more. Representative project areas <br />range in size from one to more than 130,000 acres. <br />Our engineers have been called upon by numerous <br />public agencies and major agricultural, industrial, <br />and residential developers. Our staff has the <br />expertise to conduct preliminary studies and drainage <br />consultation, prepare stormwater management plans, <br />perform watershed and floodplain analysis, prepare <br />storm drain master plans, and coordinate permit <br />applications on behalf of our clients. <br />Sewer Design and Wastewater Services. Kimley-Horn has experience in all phases of project <br />planning, design, and construction management of sewer and wastewater projects. We have a growing <br />list of collection system condition assessment projects including flow monitoring, infiltration and inflow <br />assessments, smoke and dye testing, hydraulic modeling, rehabilitation/replacement recommendation, <br />capital improvement planning, master planning, rate studies, pipe lining, pipe bursting, bypass pumping, <br />trenchless construction, lift station improvements, and odor and corrosion inspection and control. <br />City of Santa Ana . IWOC77011.19 Kimley»>Horn.7 <br />