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Bowie Resources, LLC <br /> Page 3of4 <br /> Review of 2018 AHR for the Bowie No. 2 Mine <br /> Table 3.2018 AHR Data from HUB-low Sampling Site in Hubbard Creek <br /> Concentration Concentration <br /> in 2018 AHR in 2018 AHR CDPHE <br /> Parameter Units (4/17/2018) (10/25/2018) Standard Comments <br /> Standard includes low limit <br /> pH su 8.1 8.2 6.5 - 9.0 and high limit. <br /> Standard for non-winter <br /> Temperature deg C 4.3 6.4 28.6 months. <br /> Iron,TREC mg/L 0.29 0.23 1.0 Standard is chronic. <br /> The TDS value for the HUB-low sample from April 17, 2018 was 90 mg/L, and the value from October <br /> 25 was 151. Both are well below the guideline of 750 mg/L. <br /> Analysis of Other Surface Water Data <br /> In addition to the analysis for Deer Trail Ditch and Hubbard Creek, the key parameters of pH, <br /> Temperature, TREC Iron, and TDS were compared to data at all other surface water sites, including <br /> springs. For all parameters except TREC Iron,no exceedances of standards or guidelines (for TDS) were <br /> identified. High TREC Iron concentrations were detected at sites D32-4, FMC-low, and FMC-up. In the <br /> Fire Mountain Canal,high TREC Iron concentrations were detected,but this is not likely caused by the <br /> mine,because the concentrations are almost identical at both the upstream site (FMC-up) and the <br /> downstream site (FMC-low). High TREC Iron concentration at site D32-4 in Terror Creek, 2.3 mg/L on <br /> October 25, are not problematic because this site is up-gradient of the affected area of the mine. <br /> Analysis of Springs Data <br /> High concentrations for conductivity and TDS in springs is not considered problematic because <br /> the flow rates are low, indicating very little pollutant loading, and because these parameters were <br /> not found to be an issue in the key receiving waters, Deer Trail Ditch and Hubbard Creek. <br /> Analysis of Groundwater Data <br /> The Division review of alluvial groundwater data focused on three down-gradient sites: AW-1, AW-11, <br /> and AW-14. The data were compared to water quality standards in Regulation#41 of the CDPHE Water <br /> Quality Standards. <br /> A very high pH value of 12.9 was detected at AW-1 on February 26. This is likely an instrument or <br /> recording error,but this should be confirmed by BRL. <br />