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Bowie Resources, LLC <br /> Page 2of4 <br /> Review of 2018 AHR for the Bowie No. 2 Mine <br /> It is not clear to the Division why some parameters in the surface water list in the Hydrologic <br /> Monitoring Plan of the PAP are not included in the 2018 AHR data. Please explain. Examples <br /> include Dissolved Oxygen at Deer-low and Dissolved Iron at HUB-low. <br /> Key receiving waters at the Bowie No. 2 Mine are Deer Trail Ditch and Hubbard Creek. An analysis of <br /> data for the downstream sampling locations for these receiving waters were a primary focus of this AHR <br /> review. <br /> Analysis of Surface Water Data—Deer Trail Ditch <br /> For the downstream sampling site, Deer-low,the following table includes data for parameters that: <br /> a. Had data above the detection limit in 2018 <br /> b. Correspond to standards in Regulation#35 (Segment 6a.) of the CDPHE Water Quality <br /> Standards. <br /> For the parameters in the table,the concentrations for sampling point Deer-low indicate no problems <br /> related to standards from Regulation 35 (Segment 6a.). <br /> Table 2.2018 AHR Data from Deer-low Sam l ng Site in Deer Trail Ditch <br /> Concentration <br /> in 2018 AHR CDPHE <br /> Parameter Units (4/19/2018) Standard Comments <br /> Standard includes low limit and high <br /> pH su 8.2 6.5 - 9.0 limit. <br /> Temperature deg C 5.5 28.6 Standard for non-winter months. <br /> Iron,TREC mg/L 0.293 1.0 Standard is chronic. <br /> The Total Dissolved Solids JDS)value for the Deer-low sample from April 19,2018 was 127 mg/L. <br /> This is well below the commonly-used guideline of 750 mg/L (Banta, 1988). <br /> Analysis of Surface Water Data—Hubbard Creek <br /> For the downstream sampling site,HUB-low,the following table includes data for parameters that: <br /> a. Had data above the detection limit in 2018 <br /> b. Correspond to standards in Regulation#35 (Segment 6a.) of the CDPHE Water Quality <br /> Standards. <br /> For the parameters in the table,the concentrations for sampling point HUB-low indicate no problems <br /> related to standards from Regulation 35 (Segment 6a.). <br />