|
Table 1.Proposed Quarterly Sampling Suite
<br /> Surface Water Quality
<br /> Standard,Segment 17b, Domestic Water
<br /> Included in Supply-
<br /> Included in Current 2018 Average Current Drinking Water 2018 Average
<br /> Ralston Creek CDPHE 2018)
<br /> Surface Water Surface Water Groundwater Standards Groundwater
<br /> Analyte Units Sample Suite(s)? Acute Chronic Concentration Sample Suite? (CDPHE 2016) Concentration Recommendation
<br /> Yes,Table 5 Remove. Analyte is ND in 100%of surface water samples analytes in EPP(Whetstone,
<br /> Chromium III= (Mine Pool 2016)and analyte is reported monthly for surface water under the NOV/CDO(CDPHE,
<br /> Chromium µg/L Yes,Table 1 50 - Non-Detect Only,Sample l()0 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 below CDPHE surface water and groundwater quality standards.
<br /> Copper µg/L Yes,Table 1 21.3 13.6 10.00 Yes,Table 2 1,000 95 Analyte is reported monthly for surface water under the NOV/CDO(CDPHE,2011)Sample
<br /> Suite.
<br /> Iron µg/L Yes,Table 1 -- 1,000 234.64 Yes,Table 2 300 6,454 Retain for quarterly analysis.
<br /> Lead µg/L Yes,Table 1 50 0.14 Yes,Table 2 50 5.03 Remove. Analyte is several orders of magnitude below surface water and groundwater
<br /> criteria.
<br /> Manganese µg/L Yes,Table 1 3,513.36 1,941.14 37.36 Yes,Table 2 50 85.11 Remove. Analyte is below water quality standards.
<br /> Mercury µg/L Yes,Table 1 -- 0.01 Non-Detect Yes,Table 2 Non-Detect 0.20 Remove. Analyte was ND for all 2018 surface water and groundwater samples.
<br /> Molybdenum µg/L Yes,Table 1 none 150 20 No 210 Not Sampled Remove. Analyte is below CDPHE water quality standards.
<br /> Remove. Analyte is ND in 100%of surface water samples analytes in EPP(Whetstone,
<br /> Silver µg/L Yes,Table 1 4.7 0.17 0.06 Yes,Table 2 50 0.18 2016)and analyte is reported monthly for surface water under the NOV/CDO(CDPHE,
<br /> 2011)Sample Suite.
<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 /> Yes,Code 1 and Code 4,115.95 2,570.93
<br /> Uranium µg/L 3 USEPA MCL= USEPA MCL= 13.46 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 46 Remove.Analyte is reported monthly for surface water under the NOV/CDO(CDPHE,
<br /> 2011)Sample Suite.
<br /> Dissolved Metals -
<br /> Aluminum µg/L Yes,Table 1 -- -- 32.57 Yes,Table 2 5,000 86.43 Remove.Analyte is not a water quality parameter for Ralston Creek,Segment 17b.
<br /> Antimony µg/L Yes,Table 1 none none 0.4 Yes,Table 2 6 0.47 Remove.Analyte is reported monthly for surface water under the NOV/CDO(CDPHE,
<br /> 2011)Sample Suite.
<br /> Yes,Table 5 Retain for quarterly analysis. Collect dissolved arsenic at all groundwater sample
<br /> (Mine Pool locations,not just the mine pool.
<br /> Arsenic tg/L Yes,Code 3 0.02 0.24 Only,Sample 100 50,531 Please note=50,531 ug/L is the concentration of the mine pool(Sample ID=RAW FEED).
<br /> ID=RAW Monitoring wells are not currently sampled for dissolved arsenic.
<br /> FEED)
<br /> Not in Sample Not in Sample Remove. Total boron concentrations are several orders of magnitude below groundwater
<br /> Boron mg/L No --- 0.75 Suite No 750 Suite criteria. Total boron is a more conservative measurement than dissolved boron,therefor
<br /> this analyte should be removed.
<br /> Chromium III= Remove. Analyte is ND in 100%of surface water samples analytes in EPP(Whetstone,
<br /> 110.58 2016)and analyte is reported monthly for surface water under the NOV/CDO(CDPHE,
<br /> Chromium VI= Not in Sample Not in Sample
<br /> Chromium mg/L No 16 No 100 Suite 2011)Sample Suite. Total silver concentrations are several orders of magnitude below
<br /> Chromium VI= Suite surface water and groundwater criteria. Total silver is a more conservative measurement
<br /> 11 than dissolved silver,therefor this analyte should be removed.
<br /> Copper µg/L Yes,Table 1 21.3 13.6 10 Yes,Table 2 1,000 15 Remove,analyte is below surface water and groundwater quality standards.Analyte is
<br /> reported monthly for surface water under the NOV/CDO(CDPHE,2011) Sample Suite.
<br /> Remove. Analyte is ND in 100%of surface water samples analytes in EPP(Whetstone,
<br /> Cyanide(weak acid dissociable) µg/L Yes,Table 1 5 --- 3 No 200 Not Sampled 2016)and analyte is reported monthly for surface water under the NOV/CDO(CDPHE,
<br /> 2011)Sample Suite.
<br /> Iron µg/L Yes,Table 1 --- 300 50 Yes,Table 2 300 865 Retain for quarterly analysis.
<br /> Not in Sample Not in Sample Remove. Analyte is ND in 100%of surface water samples analytes in EPP(Whetstone,
<br /> Lead mg/L No 109.46 4.27 Suite No 50 Suite 2016).Total lead concentrations are several orders of magnitude below surface water and
<br /> PAGE 6 OF 24
<br />
|