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j Huddleston -Berry <br />Engineering & resting, LLC <br />Snowcap Coal Company <br />2352 N. 7th Street, Unit B <br />Grand Junction, Colorado 81501 <br />Attention: Ms. Tonya Hammond <br />Subject: Supplemental Geophysical Investigation <br />Roadside Mine <br />Cameo, Colorado <br />640 White Avenue, Unit B <br />Grand Junction, Colorado 81501 <br />Phone: 970-255-8005 <br />Fax: 970-255-6818 <br />I nfoO_huddlestonberry.com <br />August 25, 2016 <br />Project#00489-0004 <br />Reference: Project No. 04.79160011 Phase 2 Geophysical Surveys to Idents Potential <br />Groundwater Pathways at a Site Overlying the Snowcap Coal Mine, Palisade, <br />Colorado by Fugro Consultants, Inc. for Huddleston -Berry Engineering & <br />Testing, LLC, August 23, 2016. <br />Geophysical Investigation, Roadside Mine, Cameo, Colorado by Huddleston - <br />Berry Engineering & Testing, LLC for Snowcap Coal Company, May 9, 2016. <br />Dear Ms. Hammond, <br />At your request, Huddleston -Berry Engineering & Testing, LLC (HBET) prepared this letter <br />regarding the Roadside Mine near Cameo, Colorado. As discussed in the referenced <br />Geophysical Investigation report, HBET concluded that an old air shaft at the site was the <br />conduit for surface water down into the mine workings. However, the original geophysical <br />investigation was unable to identify the pathway from the surface sinkhole openings to the air <br />shaft. As a result, HBET contracted with Fugro Consultants to conduct a supplemental <br />geophysical investigation at the site. <br />Geophysical Survey <br />The supplemental geophysical investigation was conducted by Fugro in July, 2016 and consisted <br />of additional Electromagnetic Resistivity Tomography (ERT) profile lines. However, the <br />electrode spacing was reduced to increase the resolution in the near subsurface. The referenced <br />report completed by Fugro is attached. <br />Conclusion <br />As indicated in the attached report, the geophysical survey identified a linear, horizontal anomaly <br />that extends from the surface sinkhole openings in the trench to the vertical anomaly previously <br />identified. Based upon all of the available data, HBET believes that the horizontal anomaly <br />represents the pathway from the sinkhole openings to the old air shaft. <br />TR -69 A14-15-1 09116 <br />