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Table 1.Proposed Quarterly Sampling Suite
<br /> Surface Water Quality
<br /> Domestic Water
<br /> Standard,Segment 17b, Included in Supply
<br /> Included in Current Ralston Creek(CDPHE 2018) 2018 Average Current Drinking Water 2018 Average
<br /> Surface Water Surface Water Groundwater Standards Groundwater
<br /> Analyte_ Units Sample Suite(s)? Acute Chronic Concentration Sample Suite? (CDPHE 2016) Concentration Recommendation AIINURIESIi
<br /> j groundwater criteria. Total lead is a more conservative measurement than dissolved lead,
<br /> therefor this analyte should be removed.
<br /> Manganese µg/L Yes,Table 1 3,513.36 1,941.14 20.43 Yes,Table 2 50 39.21 Remove. Analyte is below water quality standards.
<br /> Mercury mg/L No -- 0.01 Not in Sample Yes,Table 2 2 Non-Detect Remove. Analyte was ND for all 2018 surface water and groundwater samples.
<br /> Suite
<br /> Yes,Table 5 Remove. Analyte is ND in 100%of surface water samples analytes in EPP(Whetstone,
<br /> (Mine Pool 2016)and analyte is reported monthly for surface water under the NOV/CDO(CDPHE,
<br /> Silver µg/L Yes,Table 1 4.7 0.17 0.06 Only,Sample 50 Non-Detect 2011)Sample Suite. Total silver concentrations are several orders of magnitude below
<br /> ID=RAW surface water and groundwater criteria. Total silver is a more conservative measurement
<br /> FEED) than dissolved silver,therefor this analyte should be removed.
<br /> Remove. Analyte is ND in 100%of surface water samples analytes in EPP(Whetstone,
<br /> Thallium µg/L Yes,Table 1 none none 0.1 Yes,Table 2 2 0.14 2016)and analyte is reported monthly for surface water under the NOV/CDO(CDPHE,
<br /> 2011)Sample Suite.
<br /> Table 1,Code 1,Code 4,115.95 2,570.93
<br /> Uranium iig/L 3 USEPA MCL= USEPA MCL= 9.20 No 30 Not Sampled Retain for quarterly analysis.
<br /> __ _ 30 30
<br /> Zinc µg/L Yes,Table 1 249.51 188.98 10 Yes,Table 2 5,000 28 Remove.Analyte is reported monthly for surface water under the NOV/CDO(CDPHE,
<br /> 2011)Sample Suite.
<br /> Radionuclides _ __ _
<br /> Gross Alpha pCi/L Yes,Table 1 none none 14.52 Yes,Table 2 15 429 Retain for quarterly analysis.
<br /> Gross Beta pCi/L Yes,Table 1 none none 6.51 Yes,Table 2 -- 168 Retain for quarterly analysis.
<br /> Radium 226,Total pCi/L Yes,Code 3 none none 0.41 Yes,Table 2 0.84 Retain for quarterly surface water analysis. Groundwater samples will only be collected
<br /> for dissolved analytes.
<br /> Radium-226,Dissolved pCi/L Yes,Table3 and Code none none 0.36 No -- 3.16 Retain for quarterly analysis.
<br /> Remove from analysis. Radium-226 reporting is captured with total and dissolved 226
<br /> Combined Radium(Radium pCi/L Yes,Table 1 none none 0.56 No 5 Not Sampled analysis,radium-228 would be reported with gross alpha analysis.
<br /> 226+228) Additionally,analyte is reported for monthly surface water under the NOV/CDO(CDPHE,
<br /> 2011).
<br /> References:
<br /> Colorado department of Public Health and Environment(CDPHE). 2018. 5 CCR 1002-38, Regulation Number 38,Classification and Numeric Standards for South Platte Basin, Laramie River Basin,Republican River Basin,Smoky Hill River Basin,Appendix
<br /> 38-1:Stream Classifications and Water Quality Standards Tables. Water Quality Control Division. June.
<br /> CDPHE.2006. 5 CCR 1002-41,Regulation No.41.-The Basic Standards for Ground Water. Water Quality Control Division. December.
<br /> CDPHE. 2011. Notice of Violation(NOV) /Cease and Desist Order(CDO),Number I0-100601-1.Water Quality Control Division. September.
<br /> Wheatstone Associates (Whetstone).2016. Schwartzwalder Mine,Environmental Protection Plan,Revision 1.0. Table 11-6 Comparison of Water Quality in Ralston Creek to Aquatic Toxicity Standards. September.
<br /> Notes:
<br /> Grey-shaded cells highlight analytes that are retained for quarterly analysis.
<br /> The CDPHE does not maintain Domestic Water Supply standards for aluminum and boron,therefor Agricultural Standard is shown.
<br /> ftg/L=micrograms per liter
<br /> EPP= Environmental Protection Plan,Technical Revision 11 (Wheatstone Associates,2016)
<br /> mg/L= milligrams per liter
<br /> ND =Non-detect
<br /> NOV/CDO= Notice of Violation/Cease and Desist Order(CDPHE,2011)
<br /> ORP= Oxidization Reduction Potential
<br /> pCi/L= picocuries per liter
<br /> USEPA MCL=United States Environmental Protection Agency Maximum Contaminant Level
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