MICHAEL BAKER INTERNATIONAL, INC-A-2020-075-02

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1 REQUEST FOR PROPOSAL � On -Call Water Resources Engineering Services _ `� Wn (RFP NO.19-100) +M -'r�_ 4* Understanding of Need The Michael Baker Team is ready to provide the City of Santa Ana the planning, engineering, and coordination necessary for the successful completion of its capital improvement projects. Understanding of Santa Ana The City of Santa Ana started as a ranching community with some farming. To serve this growing agricultural and domestic community, a municipal water system was formed in 1886. The original source of water supply for the City was from shallow irrigation wells. As the city continued to grow and change from agriculture to an urban community, the need for additional sources of water was recognized if economic development were to continue. The City is in the heart of Orange County and rated ninth largest in California. The City's Water Utility provides water service within a 27-square mile service area. The City receives its water from two main sources, local well water from the Lower Santa Ana River Groundwater Basin, also known as the Orange County Groundwater Basin (OC Basin), which is managed by Orange County Water District (OCWD), and imported water from Metropolitan Water District (MWD). City of Santa Ana's water system includes 444 miles of transmission and distribution mains, nine reservoirs with a storage capacity of 49.3 million gallons, seven pumping stations, 20 wells, and seven import water connections. Thirteen of the City wells pump into surface reservoirs with booster stations pumping the water into the distribution system. The remaining wells pump directly into the City's distribution system. Water pumped from these wells has been naturally filtered as it passes through underlying aquifers of sand, gravel, and soil. This well water only requires disinfectant treatment for system distribution. The City maintains seven imported water connections to receive water through Metropolitan's Orange County and East Orange County Feeder pipelines. Seven metered connections with a total capacity of 60,580 gallons per minute (gpm) transfer water into the City's distribution system. The City's Sewer System consists of the City of Santa Ana and portions of City of Garden Grove and City of Orange that discharge wastewater into the City of Santa Ana's sewer system. As of 2015, the City had an estimated population of 335,264 and a projected year 2040 population of 343,766, per CDR, 2015. The City is now largely built out, with only a few areas of potential new redevelopment, primarily along the Harbor Boulevard corridor, areas west of Tustin Avenue, south of 6th Street to the 1-5 Freeway, and areas bounded by First Street, Flower Street, Civic Center Drive, and Grand Avenue. The City's sewer collection system consists of approximately 450 miles of sewer mains, including approximately 60 miles of OCSD trunk sewers within the City. The City's sewer system operates largely by gravity and discharges at several locations into gravity trunk sewers owned and maintained by the Orange County Sanitation District (OCSD). Some of these OCSD trunk sewers serve only areas within the City, but others serve areas outside the City. All the OCSD sewers in the City collect and convey wastewater to the OCSD Treatment Plant Number 1 located just southwest of the City in Fountain Valley. The majority of the City's sewers were built in the 1950s and 1960s and are now over 60 years old. Portions of the City's sewer system date back to the 1920s, with sewers over 90 years old. The material of construction of the City's sewers has generally been vitrified clay until about 1992. Since that time, PVC plastic pipe has been used for sewers up to 12 inches in diameter. Vitrified clay pipes (VCP) makes up for over 83 percent of the major sewers pipes within the system. The remaining 17 percent consists of other material types or unknown materials. Proposal I Page 11 On -Call Water Resources RFP No. 19-100 I N T E R N A T 10 N AL