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COLORADO LEGACY LAND <br /> SCHWARTZWALDER MINE <br /> • Technical Revision 29 updated the groundwater monitoring network identified in Technical Revision <br /> 27. Four shallow alluvial monitoring wells MW-1, MW-2, MW-3A, and MW-9 were removed in <br /> December 2019 as part of the alluvial valley exaction work to removed radiologically contaminated <br /> soils from the soils adjacent to Ralston Creek. <br /> Water quality samples are collected quarterly from thirteen surface water sample locations and fifteen <br /> groundwater sample locations. Table E-2 summarizes the surface water monitoring stations,which are shown <br /> in Figure E-3. Table E-3 summarizes the groundwater monitoring wells,which are shown in Figure E-4. Table <br /> E-4 summarizes the required quarterly surface water and groundwater sample analytes and field parameters. <br /> For reference,Table E-3 summarizes all the CDPHE acute and chronic surface water quality criteria for Ralston <br /> Creek and the CDPHE domestic water supply standard for groundwater. <br /> The CDPHE water Quality Control Commission has published in-stream water quality standards for this reach <br /> (Clear Creek Basin, Reach 17b - Mainstem of Ralston Creek to the outlet of the Arvada Reservoir, including <br /> Ralston Reservoir and Upper Long Lake") of Ralston Creek. Colorado Regulation Number 38 (5CCR 1002-38) <br /> lists the specific numeric standards for Stream Segment 17b,and Colorado Regulation Number 31(5CCR 1002- <br /> 31)gives the basic stream standards and methodologies applicable to all Colorado state waters. <br /> JANUARY 2021 18 AMENDMENT 5 <br />