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N0rthWest Colorado Consultants Inc. <br /> Geotechnical 1 Environmental Engineering•Materials Testing <br /> October 27,2016 <br /> Seneca Properties <br /> Jerry Nettleton <br /> 29515 RCR#27 <br /> Oak Creek,CO 80467 R�C+ <br /> Job Number: 16-10412Subject: Slope Stability Evaluation,Pond <br /> ,UN 5 211 <br /> \amat�on, <br /> 6/Access Road A Slope Failures,Seneca IIW 1O�rg&Saf e`y <br /> Mine,Routt County,Colorado. M <br /> Dear Jerry, <br /> At Seneca Properties (Seneca) request, NWCC, Inc. (NWCC) has prepared this Slope Stability Evaluation <br /> report for the slope failures situated between Pond 6 and Access Road A (Road A), located at the Seneca <br /> HW Mine in Routt County,Colorado. The project site location is shown in Figure#1. <br /> This report has been prepared to summarize the results of the geotechnical investigation (field and <br /> laboratory)recently completed at the site,as well as provide drainage and site grading recommendations for <br /> the stabilization/reconstruction of the subject slope failures. NWCC has prepared this report in general <br /> accordance with the Scope of Work outlined in the proposal/contract prepared by NWCC and dated July 19, <br /> 2016. <br /> Site Conditions: The conditions at the project site are variable due to previous site grading and coal mining <br /> operations. NWCC understands that Road A was originally constructed and used to haul coal from the mine <br /> to County Road 53 and then to railroad loadout facility situated south of Hayden, Colorado. NWCC also <br /> understands that Pond 6 was originally constructed as a sedimentation pond and the water in the pond was <br /> used during the surface mining operations that occurred to the east and southeast of the project site. <br /> It appears that a considerable amount of site grading occurred along Road A during its original construction. <br /> It appears that cut slopes on the order of 10 to 30 feet in height may have been constructed along the <br /> south/upboard side of Road A and embankment fills ranging from 20 to 40 feet in height were constructed <br /> along the north/downboard side of Road A. It also appears that portions of the Road A alignment may have <br /> had additional fill materials placed along both sides of the roadway during the reclamation operations for the <br /> mine. <br /> (970) 879-7888 • Fax (970) 879-7899 <br /> 2580 Copper Ridge Drive• Steamboat Springs, CO 80487 <br />