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Change Directive <br /> MSE/Gravity Retaining Wall <br /> Wildcat Road Construction <br /> May Day and Idaho Complex <br /> La Plata County,Colorado <br /> June 3, 2014 <br /> Description of Change <br /> In order to meet the proposed finished road grades shown on Sheet C4.11 of the Construction <br /> Plans,Mayday Idaho Mine Complex,Wildcat Road, La Plata County, State of Colorado, the <br /> following changes to the retaining wall construction are necessary: <br /> 1. The MSE/Gravity Retaining Wall will require the addition of approximately 200 to 230 <br /> square feet of MSE/gravity wall block(35 to 40 blocks). <br /> 2. The wall section above the gravity wall between Stations 19+12 and 19+00 will transition <br /> to a MSE wall starting at the fifth course of block. Geogrid lengths will be as described <br /> on the attached memorandum. <br /> 3. The MSE wall between Stations 19+00 and 18+49 will increase as necessary to meet the <br /> proposed finish road grade. The MSE wall in this section will be constructed in <br /> accordance with Section 1 on Sheet S4 and the instructions included on the attached <br /> memorandum. <br /> 4. The transition between gravity wall and MSE wall currently shown on Sheets S 1 and S2 <br /> at Station 18+49 will move to Station 18+41to accommodate the estimated increased <br /> retaining wall height from 6 blocks (9 feet)to 8 blocks (12 feet) between these stations. <br /> The MSE wall in this section will be constructed in accordance with Section 1 on Sheet <br /> S4. <br /> 5. The gravity wall section between Stations 18+41 and 17+88 will be increased in height as <br /> necessary to meet the proposed finish road grades. <br /> David S. McLay,PE,DSM Engineering,LLC <br /> Colorado License No. 38699 <br /> Agree to Complete the Change Directive: <br /> For Opal Group, Inc. <br />