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9.A. - Page 2 <br /> contaminant levels that exceed the PHG, as long as they are below the corresponding <br /> Maximum Contaminant Level or Action Level. <br /> The Code further specifies that a public hearing is to be held for the purpose of <br /> accepting and responding to public comment on the Report, and that the hearing can be <br /> part of any regularly scheduled meeting. <br /> ANALYSIS <br /> Preparation of the Report and this public hearing enables the City of Redwood City to <br /> meet the requirements of California Health and Safety Code section 116470 for <br /> accepting and responding to public comment on the Report. Furthermore it offers an <br /> opportunity to educate and inform the public of their risk to known health hazards. The <br /> 2016 Public Health Goal Report prepared by the Public Works Service Department <br /> meets the requirements of the Health and Safety Code, and includes the water quality <br /> parameters; lead and hexavalent chromium. <br /> Lead: <br /> In adherence with the Lead & Copper Rule established by the US EPA in 1991, <br /> Redwood City began monitoring for lead by collecting samples from customer taps once <br /> every three years. During the last monitoring in 2015 lead was detected in some of the <br /> samples at levels above the PHG of 0.2 parts per billion (ppb). However, all samples <br /> collected were below the EPA Action Level of 15 ppb. <br /> Lead contamination in drinking water does not generally occur from water supply <br /> sources or the water distribution system, and is most likely to come from corrosion of <br /> household pipes or plumbing fixtures. Most fixtures purchased prior to 1997 were <br /> constructed of brass or chrome-plated brass containing up to 8 percent lead. Water <br /> sitting overnight (or for several hours) in a brass fixture tends to leach lead from the <br /> interior of the fixture where the water is in contact with the brass, and may produce <br /> relatively high lead levels in the first draw of drinking water. In many cases risk of lead <br /> exposure can be reduced by flushing the fixture for a short period (1 or 2 minutes) <br /> before using the water for drinking or cooking, or replacing old fixtures with new lead <br /> free fixtures. <br /> To reduce health risk the EPA requires water systems to implement the best available <br /> technology that will reduce lead levels below the Action Level if it is exceeded. The best <br /> available technology for lead is to control the corrosiveness of the water and the effects <br /> of leaching. Even though lead levels are below the Action Level, Redwood City has <br /> implemented corrosion control practices in coordination with the San Francisco Public <br /> Utilities Commission to minimize the potential for lead contamination in drinking water <br /> through leaching of lead from plumbing fixtures containing lead. <br /> Hexavalent Chromium: <br />