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Environmental Protection Plan-Amendment <br /> ■ Within the May Day—Idaho fault zone,the identified saturated zone appears to be <br /> located at approximately 8,700 feet(AMSL) ; <br /> • Additionally,the faulting appears to have separated the Entrada Formation from the <br /> aquifers within the La Plata alluvium,the Morrison Formation and the Mancos Shale; <br /> and <br /> • The Entrada Sandstone is not considered a significant aquifer in Colorado. <br /> The conceptual model will be refined and updated as data becomes available.However, <br /> based on currently available information,the following activities will be undertaken for the <br /> protection of groundwater: <br /> ■ The groundwater quality point of compliance for the Idaho mine permit area will <br /> be the Idaho Seep; <br /> ■ The groundwater quality point of compliance for the May Day Permit area will be <br /> the monitoring well located adjacent to the May Day No. 2 mine portal. (See <br /> Exhibit G Figure G-6); <br /> ■ DRMS compliance samples will be collected twice a year or as required by <br /> CPDES permit; and <br /> ■ Routine surface and groundwater will also be sampled,analyzed and reported to <br /> DRMS. The analyte list is summarized in Exhibit G. <br /> Reference: <br /> Colorado Division of Water Resources(2010)Colorado's Well View Web <br /> http://www.dwr.state.co.us/WellViewWeb/. <br /> (b)Groundwater Quality Data <br /> Four groundwater monitoring wells are located within the mine permit area.Exhibit G- <br /> Water Information provides a detailed groundwater discussion pertaining to well <br /> completion, sampling events,well sampling Standard Operating Procedures(SOPS),field <br /> sampling notes, and water quality characteristics <br /> (c)Detection Limits <br /> Analytical detection limits and groundwater parameters are consistent with Colorado <br /> standard protocols and are discussed in Exhibit G—Water Information. <br /> Exhibit U-EPP Amendment <br /> 112d-M-1981-185 <br /> May Day Idaho Mine Complex <br /> March 10,2017 <br /> Page 19 <br />