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ARE DEFICIENT IN THE TOPSOIL SHALL BE ADDED AFTER ONE YEAR'S GROWTH OF VEGETATION AT A TIME OF YEAR APPROVED BY THE DIVISION. 12. THE PERMITTEE SHALL MAINTAIN RAPTOR BUFFER ZONES ESTABLISHED FOR THE HUNGER CANYON MINE BY THE U.S.F. W.S. FOLLOWING COMPLETION OF THE INITJAL RAPTOR SURVEY CONDUCTED IN JULY 1983. NO SURFACE DISTURBANCES SHALL OCCUR WITHIN ESTABLISHED BUFFER ZONES EXCEPT AS SPECIFICALLY AUTHORIZED BY CMLRD IN CONSULTATION WITH THE U.S.F. W.S. AND C.D.O. W. 14. THE DIVISION REQUIRES GRAND VALLEY COAL COMPANY TO COMPLETE APPROPRIATE WASTE SHEAR STRENGTH TESTS AND TO SUBMIT THE RESULTS OF THOSE TESTS TO THE DIVISION FOR REVIEW AND APPROVAL, IMMEDIATELY FOLLOWING THE AVAILABILITY OF REPRESENTATIVE COAL PROCESSING WASTE REFUSE MATERIALS. IF SIGNIFICANT MATERIAL STRENGTH VARIATION OCCURS BETWEEN THE ACTUAL TEST RESULTS AND THOSE VALUES ASSUMED IN COMPLETING THE STABILITY ANALYSIS INCLUDED WITHIN THE AMENDED PERMIT REVISION APPLICATION, THE DIVISION WILL REQUIRE GRAND VALLEY TO COMPLETE, AMENDEU STABILITY ANALYSIS AND DESIGN REVISION TO THE WASTE PILE PLAN. 15. THE DIVISION DIRECTS GRAND VALLEY COAL COMPANY TO INSTALL SIGNS AT THE PERMIT BOUNDARY AND AT STATION 67+00~ ADJOINING THE HAUL ROAD. THESE SIGNS, LEGIBLE FROM THE HAUL ROAD WHILE PROCEEDING TOWARD THE PORTAL, BENCH SHALL READ: "ROAD SLOPES SUBJECT TO ROCKFALL AND SLOPE FAILURE-PROCEED WITH CARE." 16. PRIOR TO CONSTRUCTION OF THE HAUL ROAD, THE APPLICANT MUST PROPOSE THE INSTALLATION OF ADDITIONAL ROAD SURFACE DRAINAGE CULVERTS TO MEET THE SPACING REQUIREMENTS OF RULE 4.03.1(4)(E)(VI)(A). ALTERNATIVE SPECIFICATIONS MAY BE UTILIZED UNDER THE PROVISIONS IN RULE 4.03.1(4)(E)(VI) IF THE APPLICANT DEMONSTRATES THAT THESE SPECIFICATIONS WILL NOT RESULT IN AN INCREASE IN EROSION. 17. A PERFORMANCE BOND IN THE AMOUNT OF $691,804.00, PAYABLE TO THE STATE OF COLORADO AND THE OFFICF_ OF SURFACE MINING, MUST BE FILED WITH THE DIVISION NO LATER THAT 60 DAYS PRIOR TO INITIATING ANY DISTURBANCE ASSOCIATED WITH THE PERMIT REVISION NO. 1 (CENTRAL FACILITIES) APPROVAL. NO DISTURBANCE SHALL OCCUR UNTIL THE PERFORMANCE BOND HAS BEEN APPROVED AND ACCEPTED BY THE DIVISION.