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Y <br /> Ms.Amy Eschberger Project No. 18107649 <br /> Colorado Division of Reclamation,Mining,and Safety September 5,2018 <br /> during drinking water or waste water disinfection (USEPA, 1980). There is not a source of chlorphenol at the <br /> site. <br /> ■ Phenol: Phenol is commonly found in household products, domestic, agricultural, and municipal waste, and <br /> in industries outside of mining, particularly in production of phenolic resins, slimicides, and disinfectants <br /> (USEPA, 2002). Phenol is not associated with CKD, and there is not a source of phenol at the site. <br /> ■ Color: Color is typically a constituent of concern in domestic and industrial waste waters,which are not <br /> present at the site. In groundwater samples, color could be a function of sample turbidity or suspended solids <br /> related to the aquifer solids or high levels of dissolved constituents, a likely occurrence given that the total <br /> dissolved solids concentrations of some wells at the site exceed 10,000 milligrams/Liter. <br /> ■ Odor: Odor is typically a constituent of concern in domestic and industrial waste waters,which are not <br /> present at the site.Additionally, present methods of measuring odor are subjective and the task of identifying <br /> an unacceptable level for each chemical in different waters requires more study. Further, it is typically very <br /> expensive and often impossible to identify the exact odor-producing substance (USEPA 1992). <br /> ■ Corrosivity: Corrosivity is a condition generally associated with low pH (i.e. acidic)waters. Groundwater <br /> samples collected at the site are circumneutral to alkaline. <br /> ■ Foaming Agents: Foaming agents or surfactants are usually associated with detergents and similar <br /> substances in waters. Foaming agents are not associated with CKD, and there is not a source of foaming <br /> agents at the site. <br /> ■ Cyanide: Cyanide is used in the production of paper, textiles, and plastics, as well as in metallurgy and as a <br /> pesticide in certain applications. The USEPA cites the major source of cyanide as discharge from industrial <br /> chemical factories. Cyanide is also naturally occurring in some plants and the pits and seeds of fruits, <br /> including apples and peaches. Cyanide is not associated with CKD, and there are no industrial uses of <br /> cyanide or naturally occurring sources of cyanide at the site. <br /> ■ As noted in Golder 2013, gross alpha and gross beta results from groundwater samples at the Boettcher <br /> Quarry were consistently reported at low or negative concentrations with large uncertainty(e.g., -33±18 <br /> picocuries per liter(pCi/L))and vary widely within each well and between wells. Therefore, the gross alpha <br /> and gross beta results have been ineffective parameters with regard to assessing groundwater quality. <br /> It is assumed that the revised parameter list will be used for the next three sampling events, through the end of <br /> 2019. <br /> t,,wo GOLDER 2 <br />