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Ms.Amy Eschberger Project No. 18107649 <br /> Colorado Division of Reclamation,Mining,and Safety October 10,2018 <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 /> It is assumed that the revised parameter list will be used for the next three sampling events, through the end of <br /> 2019. Pending the results of the analyses though 2019, a Technical Revision request may be made to reduce the <br /> analyte list after 2019. Per Technical Revision No. 7, TR-Sampling will continue to be conducted on a semi-annual <br /> basis for monitoring wells MW-1 through MW-7. This frequency was approved by the DRMS as adequate to <br /> assess groundwater conditions and to allow for well recharge between sampling events and true independent <br /> measurements based on groundwater equilibrium conditions. <br /> Following each sampling event, analytical results from MW-1, MW-2, MW-3, and MW-5 will be compared to the <br /> Regulation 41 "Interim Narrative Standard" provided in Table 1. Wells MW-4, MW-6, and MW-7 will not be <br /> compared to the Table 1 limits because per Section 41.5 (C) (6) of Regulation 41, the"Interim Narrative Standard" <br /> does not apply the waters with TDS greater than 10,000 mg/L. The DRMS will be notified via email of an <br /> exceedance of the limits specified on Table 1 within five working days after the completion of the comparison to <br /> limits, including any data quality review necessary to address questions concerning the validity of sampling or <br /> laboratory analyses. Additionally, these exceedances will be noted in the summary page of the monitoring report <br /> submitted to the DRMS following each sampling event. <br /> 4 GOLDER 2 <br />