25E - AGMT WATER ENGINEERING CONSULTING

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BOB OHLUND, PE — CONTINUED Features of the new ponds include three 2,000 gpm floating pump stations, approximately 2,500 If of 16 - inch to 36 -inch inlet and discharge piping, and 36 -inch diameter steel pipelines and isolation valves to interconnect the new ponds to each other and to the existing adjacent Trumble Road Recycled Water Pond. Access roads to the bottom of the ponds with landing platforms for cranes will also be provided. The project also includes improvements to two existing recycled water ponds, the 117 MG Case Road Pond and the 50 MG Watson Road Pond. These improvements include new 2,000 gpm floating pump stations and associated inlet and discharge piping, electrical and SCADA system upgrades, and deepening of Case Road Pond to optimize the storage capacity at that site. Recycled Water Use & Seasonal Storage, Diamond Valley Lake Area, Eastern Municipal Water District, California. Project manager to prepare an initial feasibility analysis to identify and evaluate potential alternatives for the use and seasonal storage of recycled water in recreational areas adjacent to the east and west dams of Diamond Valley Lake, in Riverside County, CA. Specific issues researched for the study included; • Opportunities and barriers to recycled water use for landscape and recreational purposes, • Opportunities for winter storage of recycled water for meeting -summer demand, • Potential for groundwater percolation and re -pumping for summer supply and associated impacts, • Pond design issues including liner alternatives, • Water quality issues and constraints, landscape irrigation and storage of recycled water, • Regulatory, environmental and institutional requirements and constraints, • East Valley Management Plan issues and constraints. Syphon RW Seasonal Storage Reservoir & Multi -Zone Pump Station, Irvine Ranch Water District, California. Mr. Ohlund provided evaluation of integrating this new, seasonal recycled water storage reservoir into the IRWD recycle water system. Modification to current system operation was analyzed as this reservoir will become a significant source of supply in the high demand months, in addition to operational modifications and system improvements associated with conveying large supply to fill the reservoir in low demand months. Dudek further prepared the preliminary design of a multi -zone recycled water pump station (32,000 gpm total pumping capacity). System operation, reservoir, pump stations, disinfection and pipe sizing was considered to maximize storing the excess recycled water supply potential from two reclamation plants in the winter months, yet balancing the sizing of facilities with future demands. A new multi -zone pumping station, including the ability to pump to three different pressure zones to take advantage of system head to provide an energy efficient design, strainer facilities to filter algae and other biomatter, and both disinfection and dechlorination facilities were defined and preliminary design provided. Dudek additionally prepared environmental documentation for the facilities discussed above as well as the overall dam raising project. Canyon Lake Treatment Plant Intake Facility Replacement, Elsinore Valley Municipal Water District — Principal -in -charge for the design of a new intake facility which draws water from Canyon Lake and pumps to the treatment plant. Facilities included the relocation of a floating pump platform, 500 -feet of new 30 -inch transmission main, and injectors for the injection of chlorine, acid, polymer and alum. DUDEK Page 2 of 25E-49