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associated with the MCL is 5 excess cases of cancer in 100,000 people exposed over a <br />70-year lifetime. <br />5.0 Identification of Risk Categories <br />Section 116470(b)(3) of the Health and Safety Code requires identification of the <br />category of risk to public health associated with exposure to the contaminant in drinking <br />water, including a brief, plainly worded description of those terms. The risk categories <br />and definitions for the contaminants identified above are shown on the accompanying <br />chart. <br />6.0 Description of Best Available Technology <br />Section 116470(b)(4) of the Health and Safety Code requires a description of the BAT, if <br />any is available on a commercial basis, to remove or reduce the concentrations of the <br />contaminants identified above. The BATs are shown on the accompanying chart. <br />7.0 Costs of Using Best Available Technologies and Intended Actions <br />Section 116470(b)(5) of the Health and Safety Code requires an estimate of the <br />aggregate cost and cost per customer of utilizing the BATs identified to reduce the <br />concentration of a contaminant to a level at or below the PHG or MCLG. In addition, <br />Section 116470(b)(6) requires a brief description of any actions the water purveyor <br />intends to take to reduce the concentration of the contaminant and the basis for that <br />decision. <br />Arsenic — The BATs for removal of arsenic in water for large water systems are: <br />activated alumina, coagulation/filtration, electrodialysis, ion exchange, lime softening, <br />oxidation/filtration, and reverse osmosis. Arsenic was detected above the PHG in the <br />local groundwater (Well 37). The City is in compliance with the MCL for arsenic. The <br />estimated cost to reduce arsenic levels in local groundwater to below the PHG of 0.004 <br />City fity ouncil 23 — 8 port <br />