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8.A. - Page 48 <br /> Distribution System. The Enterprise currently contains approximately 260.45 miles of <br /> pipeline, in the following sizes: <br /> Table 7 <br /> Pipeline Sizes <br /> Size(inches) Miles <br /> 3/4 0.12 <br /> 1 0.07 <br /> 1 1/2 0.06 <br /> 2 8.91 <br /> 3 0.02 <br /> 4 14.00 <br /> 6 76.29 <br /> 8 102.15 <br /> 10 7.69 <br /> 12 32.94 <br /> 14 0.21 <br /> 16 12.18 <br /> 18 1.46 <br /> 24 4.34 <br /> Total 260.44 <br /> Source:City of Redwood City-Public Works Services Department. <br /> Water Quality and Environmental Issues and Regulatory Requirements <br /> Monitoring of the imported Hetch Hetchy supply is conducted by the SFPUC. The <br /> SFPUC treats the Hetch Hetchy supply by lime addition at Rock River for corrosion control and <br /> ultraviolet light at Tesla Portal and chloramination at Sunol Valley for disinfection, as well as, <br /> fluoridation at Sunol Valley. Water that is delivered to Bay Area reservoirs receives filtration <br /> and disinfection treatment at either the Sunol or the Harry Tracy filtration plants. Filtered water <br /> from these treatment plants may be co-mingled with unfiltered Hetch Hetchy water in Bay Area <br /> transmission pipelines. Water is continuously monitored and tested by the SFPUC to ensure <br /> that water delivered to customers meets or exceeds federal and state drinking water and public <br /> health requirements. The SFPUC and its wholesale customer agencies were granted filtration <br /> avoidance for the Hetch Hetchy supply under Federal and State regulations. Under revisions to <br /> the Surface Water Treatment regulations (California Code of Regulations), which became <br /> effective in July 1998, public water systems serving water from the Hetch Hetchy supply must <br /> demonstrate to the California Department of Public Health (CDPH) that the supply meets the <br /> State criteria for filtration avoidance. The City confirms, in its certification to the CDPH, that the <br /> Hetch Hetchy water supply it distributes will be in compliance with the State criteria for <br /> filtration avoidance. <br /> Monitoring of the water quality within the City distribution system is the responsibility <br /> of the City. The City routinely monitors its system for bacteriological quality, chlorine residual, <br /> general physical parameters and disinfection byproducts. The City also conducts lead and <br /> copper tap sampling, water quality parameter monitoring, and public education as required by <br /> the EPA's Lead and Copper Rule. The City's potable water quality consistently meets primary <br /> and secondary drinking water standards. The City also has a proactive program to flush the <br /> distribution pipelines to remove deposits, encrustations, sediments, and other materials. This <br /> flushing prevents water quality problems related to taste, odor, and turbidity, among others. <br /> The City maintains a database recording the schedule and length of time for each flushing. <br /> During times of water shortage, the City may suspend flushing activities to conserve water <br /> -24- <br />