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-23- <br />Distribution System. The Enterprise currently contains approximately 259.66 miles of <br />pipeline, in the following sizes: <br /> <br />Table 7 <br />Pipeline Sizes <br /> <br />Size (inches) Miles <br />¾ 0.12 <br />1 0.12 <br />1 ½ 0.06 <br />2 8.50 <br />3 0.05 <br />4 13.73 <br />6 74.90 <br />8 102.25 <br />10 7.72 <br />12 33.02 <br />14 0.23 <br />16 12.59 <br />18 1.46 <br />20 0.50 <br />24 4.39 <br />Total 259.66 <br /> <br />Source: City of Redwood City Public Works Services Department. <br /> <br />Water Quality and Environmental Issues and Regulatory Requirements <br /> <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 /> <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 />8.C. - Page 48