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Bowie Resources, LLC <br /> Page 4 of 4 <br /> Review of 2018 AHR for the Bowie No. 2 Mine <br /> A dissolved Manganese value of 1.23 mg/L at AW-14 exceeds the Agricultural Standard of 0.2 <br /> mg/L. However,this standard is only applicable when irrigation water is applied to soils with pH <br /> values lower than 6.0, and it has been determined that soils adjacent to the North Fork of the <br /> Gunnison River typically have higher pH values, often over 7.0. This was based on an <br /> assessment of the Natural Resources Conservation Service (NRCS)Web Soil Survey. <br /> References <br /> • Banta, 1988, "A Description of the Material Damage Assessment Process Pertaining to Alluvial <br /> Valley Floors, Surface Water, Ground Water and Subsidence at Coal Mines." <br /> • CDPHE, Regulation No. 35 - Classifications and Numeric Standards for Gunnison and Lower <br /> Dolores River Basins. <br /> • CDPHE, Regulation No. 41 -The Basic Standards for Groundwater. <br /> Thank you, <br /> I <br /> Robert D.Zuber,P.E. <br /> Environmental Protection Specialist II <br /> Cc via email: Tamme Bishop,J.E. Stover&Associates, Inc. <br />