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�. COLORADO LEGACY LAND $CHWARTZWALDER MINE
<br /> For reference,Table E-2 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 /> TABLE E-1.SURFACE WATER SAMPLE LOCATIONS
<br /> Location ID/ Northing' Easting Elevation z
<br /> Sample ID (feet) (feet) (feet ams]) Location Description
<br /> Upstream sample location. Above waste
<br /> SW-AWD 3,059,695.20 1,734,877.69 6,639.9 dump(AWD).Onsite.
<br /> North waste rock pile (NWRP). Onsite.In
<br /> SW-NWRP 3,060,173.49 1,734,321.88 unlisted between north and south waste rock
<br /> piles,upstream of the cut-off wall.
<br /> Above former discharge.Onsite.Directly
<br /> SW-A001 3,060,998.25 1,733,658.14 6,590.57 below the west waste rock pile.
<br /> Below former discharge(BDIS).Onsite.
<br /> SW-BDIS 3,061,324.70 1,733,354.68 6,577.34 Below former concrete containment
<br /> structure.
<br /> SW-PL 3,061,512.01 1,733,151.24 6,563.94 Former parking lot(PL).Onsite.
<br /> SW-OS 3,061,876.50 1,732,942.97 6,552.91 Former ore sorter(OS).Onsite.
<br /> SW-BOS 3,062,101.72 1,732,741.06 6,543.60 Below former ore sorter(BOS). Onsite.
<br /> SW-GS 3,062,364.54 1,732,484.87 6,533.43 Former guard shack(GS).Onsite.
<br /> Below property line (BPL).Offsite.
<br /> SW-BPL
<br /> 3,062,913.97 1,732,112.92 6,508.97 Downstream sample location,just below
<br /> entrance gate.
<br /> First bridge (FBRG)after leaving site.
<br /> SW-FBRG 3,063,726.64 1,731,653.13 6,460.0 Offsite.
<br /> 3,064,025.21 1,729,697.69 6,358.0 Above red hill(ARH). Offsite. Near the
<br /> SW-ARH large red boulders in the creek bed.
<br /> Long lake head gate (LLHG). Offsite.
<br /> SW-LLHG 3,065,585.20 1,726,947.69 6,358.0 Sample collected upstream of concreate
<br /> head gate.
<br /> V-notch weir.Offsite. Sample collected
<br /> SW-WEIR 3,066,960.31 1,724,127.45 unlisted upstream of Denver Water's flow control
<br /> structure.
<br /> JULY 2020 13 AMENDMENTS
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