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Calculated Corrosion Indices <br />• Indices are used to provide insight on <br />calcium carbonate stability of a <br />particular water <br />• Calcium carbonate precipitate can be <br />useful for preventing general corrosion <br />• Indices do not relate specifically to <br />copper corrosion rates <br />• Results indicate that the water is <br />considered slightly corrosive towards <br />iron and calcium carbonate by industry <br />standards <br />• However, calcium carbonate <br />precipitation is not considered an <br />effective form of lead and copper <br />corrosion control <br />12/12/24 Item 5.B. <br />OTETRA TECH <br />Notes. <br />'Calculated usingthe RTW Model. <br />2Varies for each individual water treatment system. <br />,Calculated using water quality from IRCDUS 2020 Triennials Report. <br />f <br />Preventing Copper Corrosion <br />• Copper is a widely used plumbing material for drinking water lines <br />Copper passivation 4 pipe and water react directly to form corrosion byproduct which forms a <br />layer <br />This layer acts as a protective film <br />• Scaling is another method to achieve a protective film in piping <br />Chemical precipitation causes deposition of material onto surface <br />Scales can be made of varying compounds 4 most commonly, calcium carbonate <br />• Corrosion typically occurs when these layers are disrupted, and piping is <br />t <br />3 <br />