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Table 1.Proposed Qu rterly Sampling Suite Included in Included in Current Water Quality Standard,Segment 17b, Units Current Surface Water Ralston Creek(CDPHE 2018) Groundwater Sample Suite? Sample Suite(s)? Analyte Acute Chronic Recommendation Boron m L Yes,Table 2 No --- 0.75 Remove. Analyte is ND in 100%of surface water samples analytes in EPP Whetstone,2016). Chromium III= Remove. Analyte is ND in 100%of surface water samples analytes in EPP(Whetstone,2016)and analyte is reported monthly for surface Chromium mg/L Yes,Table 2 Chromium VI=16 110.58 No Chromium VI=11 water under the NOV/CDO(CDPHE,2011)Sample Suite. Copper µg/L Yes,Table 2 Yes,Table 1 21.3 13.6 Remove.Analyte is reported monthly for surface water under the NOV/CDO(CDPHE,2011)Sample Suite. Cyanide(weak acid dissociable) µg/L No. Yes,Table 1 5 --- Remove. Analyte is ND in 100%of surface water samples analytes in EPP(Whetstone,2016)and analyte is reported monthly for surface water under the NOV/CDO(CDPHE,2011)Sample Suite. Iron µg/L Yes,Table 2 Yes,Table 1 --- 300 Retain for quarterly analysis. Lead m L Yes,Table 2 No 109.46 4.27 Remove. Analyte is ND in 100%of surface water samples analytes in EPP Whetstone,2016). Manganese µ L Yes,Table 2 Yes,Table 1 3,513.36 1,941.14 Retain for quarterly analysis. Mercury m L Yes,Table 2 No - 0.01 Retain for quarterly analysis. Molybdenum L No No - Add parameter to sample suite for comparison between total and dissolved metals. Silver µg/L Yes,Table 2 Yes,Table 1 4.7 0.17 Remove. Analyte is ND in 100%of surface water samples analytes in EPP(Whetstone,2016)and analyte is reported monthly for surface water under the NOV/CDO(CDPHE,2011)Sample Suite. Thallium µg/L Yes,Table 2 Yes,Table 1 none none Remove. Analyte is ND in 100%of surface water samples analytes in EPP(Whetstone,2016)and analyte is reported monthly for surface water under the NOV/CDO(CDPHE,2011)Sample Suite. Uranium µg/L No Table 1,Code 1,Code 3 4,115.95 2,570.93 Retain for quarterly analysis. USEPA MCL=30 USEPA MCL=30 Zinc µ L Yes,Table 2 Yes,Table 1 249.51 188.98 Remove.Analyte is reported monthly for surface water under the NOV CDO CDPHE,2011 Sample Suite. Radionuclides Gross Alpha Ci/L Yes,Table 2 Yes,Table 1 none none Retain for quarterly analysis. Gross Beta Ci/L Yes,Table 2 Yes,Table 1 none none Retain for quarterly analysis. Radium-226,Total pCi/L Yes,Table 2 Yes,Code 3 none none Retain for quarterly analysis. Radium-226,Dissolved pCi/L No Yes,Table3 and Code none none Retain for quarterly analysis. Combined Radium(Radium Remove from analysis. Radium-226 reporting is captured with total and dissolved 226 analysis,radium-228 would be reported with gross 226+228) pCi/L No Yes,Table 1 none none alpha analysis. Additionally,analyte is reported for monthly surface water under the NOV CDO CDPHE,2011). References: 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 38-1:Stream Classifications and Water Quality Standards Tables. Water Quality Control Division. June. CDPHE. 2011.Notice of Violation(NOV)/Cease and Desist Order(CDO),Number 10-100601-1.Water Quality Control Division. September. 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. Notes: Grey-shaded cells highlight analytes that are retained for quarterly analysis. µg/L=micrograms per liter EPP=Environmental Protection Plan,Technical Revision 11 (Wheatstone Associates,2016) mg/L=milligrams per liter ND =Non-detect NOV/CDO=Notice of Violation/Cease and Desist Order(CDPHE,2011) ORP=Oxidization Reduction Potential pCi/L=picocuries per liter USEPA MCL=United States Environmental Protection Agency Maximum Contaminant Level PAGE 6 OF 22