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1.0 ROAD MODIFICATIONS AND ENTRY PORTALS
<br />1.1 GENERAL
<br />1.1.1 ROAD MODIFICATIONS AND ENTRY PORTALS SHALL. BE DEVELOPED IN ACCORD-
<br />ANCE WITH THE CONSTRUCTION DRAWINGS AND ALL NOTES CONTAINED
<br />THEREO
<br />1.2 ROAD MODIFICATIONS AND TEMPORARY RAMP CONSTRUCTION
<br />1.2.1 THE EXISTING MINE ACCESS ROAD SHALL BE RELOCATED AS SHOWN ON THE:
<br />CONSTRUCTION DRAWINGS.
<br />1.2.2 BENCHES SHALL. RE: CONSTRUCTED AT INTAKE: PORTAL.. AND RETURN PORTAL, AT
<br />THE ELEVATIONS SHOWN ON THE CONSTRUCTION DRAWINGS.
<br />1.2.3 A TEMPORARY ACCESS RAMP TO THE BFLTLINE PORTAL SHALL BE CONSTRUCTED
<br />USING A COMPACTED FILL PRIOR 10 COMMENCING EXCAVATION OF THIS
<br />ENTRY.
<br />1.2.4 THE FOUNDATION OF THE TEMPORARY ACCESS RAMP SHALL RE CLEARED OF ALI,
<br />VEGETATION, TRASH, WEAK ZONES, OR OTHER MATERIAL THAT COULD INFLU-
<br />ENCF THE STABILITY OF' THE: FILL.
<br />1.2.5 THE FOUNDATION OF THE TEMPORARY ACCESS RAMP SHALL BE, I,F.VELEI) PRIOR
<br />TO PLACEMFNT OF ANY FILL.
<br />1.2.6 FILL. FOR Till' 'TEMPORARY ACCESS RAMP CAN HI Dil'CAINEA) FROM ROAD EXCA-
<br />VATION. INITIAL DEVFL.OPM!4'C OF 'TIIF: INTAKE: AND HFTL'HN KNTRIES, O1(
<br />OTHFR SUTTAB!,L: APPROVED SOURCES.
<br />1.2.7 TEMPORARY ACCESS RAMP FL LI, SRAI I BF SPREAD IN APPROX I MATFLY HOR I -
<br />ZONTAi LAYERS NOT EXCFEDIN6 12 INCHES IN LOOSE' THICKNESS AND SHALL
<br />HE COMPACTED UNIFORMLY RA' ROUTING CO•:STRCCTION EQUIPMENT OVEP THE
<br />SURFACE: OF THE FILL. OR RY OTHER MEANS AS NECESSARY FOR ENSURIN), THE
<br />REQUIRED DEGREE. OF COMPACTION.
<br />1.2.8 AIA, COMPACTED SOIL FILL IN THE TEMPORARY .ACCESS RAMP SHALL, HAVE A
<br />DRY DENSITY OF AT LEAST 95 PERCENT OF THF MAXIMUM DRY DENSITY AS
<br />DETERMINED BY THE AMERICAN ASSOCIATION OF STATE' HIGHWAYS AND
<br />TRANSPORTATION OFFICIALS (AASHTO) SPECIFICATION T99 -74 ( "STANDARD
<br />PROCTOR ") .
<br />1.2.9 THE: OVI'SLOPF OF THE: TFMPORAHY :ACCESS RAMP SHALL NOT F:XCE'FO
<br />1.5(11):I(V).
<br />1.2.10 SUI'CABLE BARRICADES SHALL RE INS "CALLE.D ALONG THE CREST OF THE
<br />TEMPORARY ACCESS RAMP.
<br />1.2.11 THE TEMPORARY ACCESS RAMP SHALL BE REMOVED AND THE GROUND SURFACE
<br />REGRADED TO THE PERMANENT BELTLINE PORTAL BENCH CONFIGURATION AFTER
<br />THE FIRST SEGMENT OF HAULAGE, CONVEYOR HAS BE:F,N INSTALLED.
<br />.N
<br />2.0 DEVELOPMENT HOCK DISPOSAL,
<br />2.1
<br />GENERAL
<br />3.3
<br />2.3
<br />SITE P ON REPARATI
<br />3.1
<br />2.1.1
<br />ROCK PRODUCED DURING ENTRY DEVELOPMENT SHALL BE DISPOSED OF IN
<br />3.3.1
<br />2.3.1
<br />ACCORDANCE: WITH THE CONSTRUCTION DRAWINGS AND NOTES THEREON.
<br />3.1.1
<br />2.1.2
<br />COLLUVIAL SOILS PRODUCED DURING INITIAL ENTRY DEVELOPMENT MAY HE
<br />DISPOSED OF IN THE CENTRAL PORTION OF THE DISPOSAL FILLS, USED FOR
<br />3.3.2
<br />2.3.2
<br />ROCK SLOPE ENTRY PORTALS AND ROAD CONSTRUCTION, OR USED FOR OTHER
<br />3.1.2
<br />APPROVED PURPOSES SUCH AS COVERIN "; ROCK FILLS.
<br />COMPACTED BY ROUTING CONSTRUCTION EQUIPMENT OVER THE SURFACE OF T'HE'
<br />1.3
<br />3.1.3
<br />2.1.3
<br />TOTAL, IN- PLACE, VOLUME OF EXCAVATED MATERIAL FROM THE THREE: ENTRIES
<br />IS ESTIMATED TO HE 65,600 CUBIC YARDS. ASSUMING A SWELL FACTOR OF
<br />2.3.4
<br />30 PERCENT, APPROXIMATELY 86,000 CUBIC YARDS OF EXCAVATED DEVELOP-
<br />3.3.4
<br />THE EXISTING SURFACE DRAINAGE SYSTEM SHALI, RE DISRUPTED TO TILE:
<br />MENT ROCK AND SOIL WILL HAVE TO BE DISPOSED.
<br />SURFACE. DRAINAGE THE FILL SHALL RE MAINTAINED THROUGHOUT CON-
<br />3.5
<br />PRIOR TO PLACEMENI' OF ANY FILL.
<br />3.2
<br />2.2
<br />DISPOSAL LOCATIONS AND DISPOSAL. AREA VOLUMES
<br />3.2.1
<br />2.2.1
<br />DEVELOPMENT ROCK SHALL INITIALLY HE DISPOSED OF BY DUMPING DOWN THE:
<br />2.3.6
<br />INTAKE AND RETURN VENTILATION SHAFTS LOCATED ON THE EXISTING FAN
<br />3.2.2
<br />DRAINAGE MODIFICATIONS SPECIFIED ON THE CONSTRUCTION DRAWINGS SHALL
<br />LEVEL. THE BOTTOMS OF THESE. SHAFTS WERE PREVIOUSLY BACKFILLF.D; A
<br />NO FILL MATERIAL SHALL BE PLACED ON STANDING WATER, SNOW, OR ICE.;
<br />TOTAL OF 6,000 CUBIC YARDS OF USABLE DISPOSAL. VOLUME: IS ESTIMATED
<br />BE COMPLETED AS QUICKLY AS POSSIBLE. 1'0 RESTORE: DRAINAGE,.
<br />2.3.7
<br />TO REMAIN IN THE TWO SHAFTS.
<br />COMHUSTIRLF: MATERIAL IN ACCORDANCF WITH 30 CFR 75.1711 PRIOR TO
<br />3.2.3
<br />2.2.2
<br />TH!: DEVELOPMENT ROCK DISPOSAL AREA LOCATED ON THE PORTAL L,EVEI,
<br />3.4.1
<br />PORTAL DEVELOPMENTC
<br />BENCH HAS A CAPACITY OF APPROXIMATELY 67,000 CUBIC YARDS.
<br />IT IS ANTICIPATED THAT FILi, MATEHIAL.S WILL CONSIST PREDOMINANTLY OF
<br />1.4.1
<br />:3.2.4
<br />2.2.3
<br />THE DEVELOPMENT ROCK DISPOSAL :AREA LOC'ATFD ON THE F.4i)LOYEE PARKING
<br />LOT HAS A CAPACITY OF APPROXIMATFLY 1 -;,000 C131C YARDS.
<br />3.4.2
<br />3.3
<br />2.3
<br />SITE P ON REPARATI
<br />1.2.12
<br />THE OUTSLOPE OF THE PERMANENT BELTLINE PORTAL BENCH SHALL NOT EX-
<br />--
<br />- - - -TI
<br />3.3.1
<br />2.3.1
<br />Boni PORTAL, I,FVFL AND P:ARKiSi LOT DISPOSAI. :ARF'AS ARE L.00ATE'D ON
<br />CEED 2(H):1(V).
<br />2.4.1
<br />APPROXIMAT'-,LY HORIZIINT'AL HKNC!IF.S CO \STRUCIED PHf1( , IPAI,LY WITHIN
<br />SOUS!) BEDROCK. MINIMAL, FOUNDATION PREPARATION IS ANTICIPATED.
<br />3.3.2
<br />2.3.2
<br />ANY POWER P)LF:S OR STRUCTURFS THAT HFQUIRE HF'L,OCATION WITHIN THE
<br />FILL AREAS SH:AIJ, BF REMOVED PRfOH TO PLA E'MF:\!' OF ANY FILL,.
<br />COMPACTED BY ROUTING CONSTRUCTION EQUIPMENT OVER THE SURFACE OF T'HE'
<br />1.3
<br />3.3.3
<br />2.3.3
<br />'UHF SI.oPF: OF THI( FOUNDATION IN T'HF VICINITY OF THE TOF OF THE FILL
<br />SHALT. NOT EXCFF'D 2.800:1(V).
<br />2.3.4
<br />AN ACCESS AND CATCH BENCH SHALL.. RE.. C O\STRUCTF.D AT T'HF TOE OF THE
<br />3.3.4
<br />THE EXISTING SURFACE DRAINAGE SYSTEM SHALI, RE DISRUPTED TO TILE:
<br />PARKIN); LO'!' DISPOSAL AREA, AS SHOWN IN Till-: CONSTRUCTION DRAWINGS,
<br />SURFACE. DRAINAGE THE FILL SHALL RE MAINTAINED THROUGHOUT CON-
<br />3.5
<br />PRIOR TO PLACEMENI' OF ANY FILL.
<br />MINIMUM EXTENT POSSIBLE DURING CONSTRUCTION.
<br />MINIMUM
<br />2.3.5
<br />ANY ASPHALT PAVING IN THE TOE AREA OF THE FILLS SHALL RE REMOVED
<br />3.5.1
<br />1.3.2
<br />WHERE THE F ILA, DEPTH WILL BE L.F.SS THAN 4 FEFT.
<br />2.3.6
<br />INSTALLATION OF' PRESSURE REGULATING PIPE OR ANY OTHER STRUCTURES
<br />DRAINAGE MODIFICATIONS SPECIFIED ON THE CONSTRUCTION DRAWINGS SHALL
<br />THAT WOULD PASS THROUGH THE FILLS SHALL RE, COMPLETED PRIOR TO
<br />NO FILL MATERIAL SHALL BE PLACED ON STANDING WATER, SNOW, OR ICE.;
<br />COMMENCEMENT OF FILL PLACEMENT.
<br />BE COMPLETED AS QUICKLY AS POSSIBLE. 1'0 RESTORE: DRAINAGE,.
<br />2.3.7
<br />EXISTING PORTALS ON THE: PORTAL LFVEI. SHALT, BE BACKF'ILLED WITH NON -
<br />COMHUSTIRLF: MATERIAL IN ACCORDANCF WITH 30 CFR 75.1711 PRIOR TO
<br />3.4
<br />INTO THE FILL.
<br />COMMFNC'EMF:NI' OF' ROCK FILL P1 ACI :NEWT
<br />3.4.1
<br />3.4.2
<br />3.5.7
<br />3.5.8
<br />3.0 RECLAMATION
<br />GENERAL
<br />RECLAMATION OF THE ROCK SLOPE. ENTRY PORTALS AND DEVELOPMENT ROCK
<br />DISPOSAL AREAS SHALL BE PERFORMED IN ACCORDANCE WITH THE
<br />CONSTRUCTION DRAWINGS AND ALL NOTES CONTAINED THEREON.
<br />RECLAMATION SHALL 13E CONSISTENT WITH THE EXISTING RECLAMATION PLAN.
<br />ALI, .AREAS WHICH ARE NOT MODIFIED BY THE ROCK SLOPE ENTRY PORTALS
<br />AND DEVELOPMENT ROCK DISPOSAL AREAS SHALL BE RECLAIMED IN ACCORD -
<br />ANCE WITH THE EXISTING RECLAMATION PLAN.
<br />VENTILATION SHAFTS
<br />VENTILATION SHAFTS SHALL BE BACKFA LLF.D TO THE EXISTING FAN LEVEL
<br />ELEVATION WITH DEVELOPMENT HOCK.
<br />ADDITIONAL ROCK OR SOIL SHALL RE USED TO MAINTAIN THE LEVEL OF THE
<br />SHAFT FILL AT THE FAN LEVEL ELEVATION IF THIS IS NECESSARY DUE TO
<br />SETTLEMENT OF' FILL.
<br />INTERIM RECLAMATION ()F THE VENTILATION SHAFTS SHALL BE IN ACCORD-
<br />ANCE WITH THE' FXISCIN(i I?F.CI.AMA'CIUN PLAN.
<br />TIIF; FAN I,E.A'E'I, SHALL RF RECLAIMED UPON FINAL ABANDONMENT IN ACCORD-
<br />ANCE WITH rill EXISTING HE:CI.AMA'I'IOS PLAN.
<br />ROCK SIOPI• -ENTRY PORTALS
<br />:11.1. PIPES. I'T'll ITY LINES, ETC. SI ;ALL BF REMOVED WHF:RF RE14UIRE:1)
<br />BFFUHF BA( " :.FILI.IN( ;.
<br />ROCK S1.0Pi INTRY PORTALS SHALI, BF HAFKFILLF.D WITH NON- COMBUSTIBLF
<br />MA'rE,HIA1, FOH A MINIMUM DISTANCE OF 25 FI• :FT FHOM THE PORTAL OPENINGS
<br />PE!1 :3O CFR. 75.1711 -2.
<br />THE. ROCK SLOPE ENTRY PORTALS SHALL RE BACKF 11.I.F.D IN .ACCORDANCE: WITH
<br />THF: RECLAIMED SLOPE. CONF'IGURA'TIONS IN "I'HI• FXISCING RECLAMATION
<br />PLAN.
<br />L'PON FINAL A..ANDONNFST, THE PORTAL AREAS SHALL BE RECLAIMED IN
<br />A(01RDAVCE WITH THE EXISTING RECl,AMATION P!.:AN.
<br />PORTAL LEVEL ROCK DISPOSAL AREA
<br />THE CONFIGURATION OF CONSTRUCTED DISPOSAL FILL SHALL, BF. THE.- SAME AS
<br />THE RECLAIMED CONF'IGURAT'ION, EXCEPT AS NOTED IN 3.4.2.
<br />PRIOR TO FINAL RECLAMATION, THE TOP OF THE FILL SHALL BE REGRADED
<br />IF NECESSARY TO ENSURE THE PERMANENT OVERLAND FLOW OF RUNOFF TOWARD
<br />THE PERMANENT DRAINAGE. CHANNEL NORTH OF THE FILL.
<br />SUBSEQUENT TO CONSTRUCTION OF THE FILL, FILL OUTSLOPES SHALL BE
<br />REVEGETATED IN ACCORDANCE WITH THE VEGETATION PLAN. VEGETATION
<br />SHALI. BE MONITORED AND IF VF.(;F.TATION GROWTH IS UNSUCCESSFUL, ADDI-
<br />TIONAL, COVER OF THE BEST AVAILABLE. MATERIAL OR SOIL 'TREATMENTS
<br />SHALL BE APPLIED.
<br />PARKING 1.01' ROCK DISPOSAL AREA
<br />THE C'ONF'IGURATION OF THE SURFACE AND OUTSLOPE OF THE CONSTRUCTED
<br />FILL SHALL RE THE SAME AS THE RECLAIMED CONFIGURATION, EXCEPT WHERE'.
<br />THE FILL IS REGRADED UPON FINAL ABANDONMENT FOR CONSTRUCTION OF A
<br />PERMANENT DRAINAGE CHANNEL.
<br />A 10 -FOOT (MINIMUM) HEIGHT BUTTRESS FILL SHALL BE CONSTRUCTED AT
<br />THF,'TOF OF THF. HOCK CUT AT THE NORTH END OF THE FILL. THE FILL
<br />BUTTRESS SHAi,I. HAVE A 2(H):I(V) OUTSLOPE.
<br />THE FILL BUTTRESS SHALL BE CONSTRUCTED BY PLACING FILL IN
<br />HORIZONTAL LIFTS NOT EXCEEDING 24 INCHES IN LOOSE THICKNESS AND
<br />CO',1PACTI•:D UNIFORMLY BY ROUTIN(; CONSTRUCTION EQUIPMENT OVER THE FILL,
<br />SURFACF.
<br />COMPACTED SOIL IN THE BUTTRESS SHALL HAVE A DRY DENSITY OF AT LEAST
<br />90 PERCENT OF THE MAXIMUM DRY DENSI'T'Y AS DETERMINED BY THE AASHTO
<br />T99 -74 SPEC IFI CAT U)`: ( "ST'A'NDARD PROCTOR ").
<br />UPON FINAL AHANDONMFNT, 4 PERMANENT DRAINAGE. CHANNEL, SIZED IN
<br />ACCORDANCE WITH THE EXISTING RECLAMATION PL =.N, SHALL BE CONSTRUCTED
<br />ACROSS THE F'I1A. SURFACF,, AS SHOWN 0'V THE CONSTRUCTION DRAWINGS, AT
<br />A MINIMUM DISTANCE: OF 5 FEE:'! FROM THE TOE OF' THE FILL BUTTRESS.
<br />THE EAST END OF THE FILL SHALL BE GRADED AT 10 PERCENT TO THE EAST
<br />FOR FINAL RECLAMATION SO THAT THE PEIIM.ANENT DRAINAGE. CHANNEL DOES
<br />NOT' DISCHARGE. OVF'R THE FILL OUTSLOPE.
<br />THE: PERMANENT DRAINAGE: CHANNEL SHALI, RE HIPRAPPED IN ACCORDANCE,
<br />WITH I'HE E:XIS'CIN•; RF.CI,AMATION PLAN WHERE ITS GRADIENT EXCEEDS 10
<br />PI:I(CF.sT.
<br />SUBSEQUENT TO CONSTRUCTION OF THE FILL, THE FILL OUTSLOPE SHALL RE
<br />REVEC;ETATED IN ACCORDANCE WITH THE EXISTING VEGETATION PLAN.
<br />VEGETATION ON THE FILLS SHALL BE MONITORED AND IF VEGETATION GROWTH
<br />IS UNSUCCESSFUL, ADDITIONAL COVER OF THE HEST AVAILABLE. MATERIAL OR
<br />SOIL TREATMENTS SHALL HE APPLIED.
<br />4.0 INSPECTION
<br />4.1 ROCK ENTRY PORTALS AND ROAD DRAINAGE
<br />4.1.1 CONSTRUCTION IN THE PORTAL. AREAS AND INSTALLATION OF THE SURFACE -
<br />WATER DRAINAGE SYSTEMS SHALL BE INSPECTED AND CERTIFIED AFTER
<br />CONSTRUCTION BY A QUALIFIED REGISTERED PROFESSIONAL ENGINEER.
<br />4.1.2 AN EXPERIENCED GEOTECHNI(It. ENGINEER SHALL RE PRESENT DURING CON-
<br />STRUCTION OF PORTAL FACEUPS TO ENSURE THAT THE FACEUPS ARE COM-
<br />PLETED IN ACCORDANCE WITH THESE SPECIFICATIONS.
<br />4.1.3 THE PORTAL AREAS SHALL BE INSPECTED DAILY WHILE ENTRY DEVELOPMENT
<br />IS WITHIN SOILS AND UNTIL THE ENTRIES HAVE BEEN DEVELOPED TO AT
<br />LEAST 150 FEET FROM THE PORTALS IN ORDER TO IDENTIFY ANY IN-
<br />STABILITY THAT MAY DEVELOP IN THE SLOPES IN THE VICINITY OF THE
<br />PORTAL.
<br />4.2 DEVELOPMENT ROCK DISPOSAL
<br />4.2.1 DEVELOPMENT ROCK DISPOSAL FILLS SHALL. BE INSPECTED BY A QUALIFIED
<br />REGISTERED PROFESSIONAL. ENGINEER.
<br />4.2.2 DISPOSAL INSPECTIONS SHALI. OCCUR QUARTERLY, BEGINNING WITHIN 7 DAYS
<br />AFTER FOUNDATION PREPARATION.
<br />4.2.3 IN ADDITION TO QUARTERLY INSPEC'T'IONS, SITFS SHALT, RE INSPECTED
<br />DURING, THE 1'()LLOWING CONSTRUC'T'ION PERIODS:
<br />A) COMPLET'IE)N OF FOUNDATION PREPARATION AND INSTALLATION OF PIPES
<br />OR OTHER STRUCTURES THAT WOULD 13F LOCATE _D WITHIN THE FILL;
<br />R) PLACEMENT AND COMPACTION OF FILL MATERIALS; AND
<br />C) RECLAM:ATU)N.
<br />4.2.9 211E ITISPEC2IIIG ENGINEERS' CERTIFIED REPORTS SHALL BE PROVIDED TO
<br />'tllE COLORADO MINED LAI1D RECLAMATION DIVISION WITHIN 2 WEEKS AFTER
<br />EACII INSPECTION. THE REPORTS EIILL CERTIFY THAT THE FILL HAS BEE14
<br />(:GNSTRUCTED AS SPECIFIED II) TINE DESIGN. A COPY OF THE REPORTS
<br />SHALL BE RETAINED AT TINE MINE OFFICE.
<br />Vf®4 f®
<br />,UN
<br />MANED �'DO ASA�N
<br />PEG�MA�AON
<br />I , `
<br />DAAM'h B D L ;.> -E N- /A 6ATE 3/27/87
<br />CHECKED GM EKE- Da Ho 873 -207 1
<br />D «� " 7 OF 7
<br />Golder Associates °' ' IIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIII
<br />,104431
<br />3.4.3
<br />1.2.12
<br />THE OUTSLOPE OF THE PERMANENT BELTLINE PORTAL BENCH SHALL NOT EX-
<br />2.4
<br />CONSTRUCTION
<br />CEED 2(H):1(V).
<br />2.4.1
<br />TUNNEL DEVELOPMENT ROCK SHALL RE SPREAD IN APPROXIMATELY HORI7.ONTA1.
<br />LAYERS NOT EXCEEDING 24 INCHES IN LOOSE THICKNESS AND UNIFORMLY
<br />COMPACTED BY ROUTING CONSTRUCTION EQUIPMENT OVER THE SURFACE OF T'HE'
<br />1.3
<br />SURFACE DRAINAGE
<br />LIFT.
<br />1.3.1
<br />THE EXISTING SURFACE DRAINAGE SYSTEM SHALI, RE DISRUPTED TO TILE:
<br />2.4.2
<br />SURFACE. DRAINAGE THE FILL SHALL RE MAINTAINED THROUGHOUT CON-
<br />3.5
<br />MINIMUM EXTENT POSSIBLE DURING CONSTRUCTION.
<br />MINIMUM
<br />BY GRADING G THE SURFACE. TO A MINIMUM SLOPE OF 2 PERCENT
<br />3.5.1
<br />1.3.2
<br />WHERE: THE F,XIS'CING DRAINAGE SYSTEM WOULD BF DISRUPTED, SURFACE:
<br />AND ENSURING THAT NO SIGNIFICANT SURFACE DEPRESSIONS EXIST.
<br />DRAINAGE MODIFICATIONS SPECIFIED ON THE CONSTRUCTION DRAWINGS SHALL
<br />2.4.3
<br />NO FILL MATERIAL SHALL BE PLACED ON STANDING WATER, SNOW, OR ICE.;
<br />BE COMPLETED AS QUICKLY AS POSSIBLE. 1'0 RESTORE: DRAINAGE,.
<br />NOR SHALL SNOW, ICE, OR OTHER DELETERIOUS MATERIALS BE INCORPORATED
<br />INTO THE FILL.
<br />3.5.2
<br />1.4
<br />PORTAL DEVELOPMENTC
<br />2.4.4
<br />IT IS ANTICIPATED THAT FILi, MATEHIAL.S WILL CONSIST PREDOMINANTLY OF
<br />1.4.1
<br />TUNNEL FACEUPS FOR PORTAL DEVELOPMENT' SHALI. NOT COMMENCE UNTIL THE
<br />FRESH SANDSTONES WITH A LIMITED AMOUNT uF SHALE. ANY MATERIALS
<br />STRENGTH
<br />'TUNNELING CONTRACTOR OR CREW ARF RF4DY TO COMMENCE TUNNELING.
<br />ENCOUNTERED THAT MAY SLAKE OR HAVE A SIGNIFICANTLY LOWER
<br />MIXED WITH MORE
<br />3,5.3
<br />THAN THE EXPECTED FILL MATERIAL SHALL RE THOROUGHLY
<br />1.4.2
<br />TUNNEL FACEUPS SHALL BE LIMITED TO THE SIZE: OF THE ENTRIES; NO
<br />COMPETENT MATERIALS AND SHALL RE INCORPORATED INTO THE NORTHERN
<br />THE VENTILATION
<br />EXCESS EXCAVATION FOR THE PORTAL SHALI. HE PERMITTED WITHOUT THE
<br />PORTIONS OF THE FILLS, OR SHALL BE DISPOSED OF IN
<br />BE INCORPORATED INTO THE FILL
<br />EXPRESS CONSENT OF COLORADO WESTMORELAND INC. OR ITS AUTHORI'Z.ED
<br />SHAFTS. NO WEAK MATERIALS SHALL
<br />FOUNDATION OR IN THE VICINITY OF THE FILL. OUTSLOPE.
<br />3.5.4
<br />REPRESENTATIVE.
<br />SOILS OVERLYING THE ENTRIES .SHALL BE FULLY SUPPORTED
<br />2.4.5
<br />THE CONSTRUCTED HEIGHT OF THE PORTAL AREA FILL SHALL EXCEED THE
<br />1.4.3
<br />COLI•L'VIAL
<br />'!.L TUNNELING TO FNSURF'THAT NO DEFORMATIONS
<br />DESIGN HEIGHT BY .APPROXIMATELY 5 PERCENT TO INSURE THA'C FUTURE
<br />THROUGHOUT SOFT GROU%r,
<br />INSTABILITY ARI' PFR:,ITTF.D TO DEVELOP.
<br />SETTLEMENT OF 'THE, FILL. WILT, NOT DISRUPT THI NORTHERLY DIRECTION OF
<br />3,5.5
<br />THAT COULD RESULT IN SL.OPI.
<br />THE SURFACE DRAIN-AGE OF THE TOP OF THE FILL.
<br />1.4.4
<br />ALL TUNNELING IN THF VICINITY OF CHE PURTAI. SHALI. Rf' ! NDFRTAKEN' IN
<br />SUCK A MANNER 1'111'1' viiFRE, AI,E N(, EC('� :SST'.)' A'II3R,A'CI))N.i THAT CO1'1 D
<br />RFSI.I,T IN SLOPE: ;NS: Ai31LI'TY.
<br />2.5
<br />INSPLCTIONS
<br />3.5.5
<br />2.5.1
<br />FILLS SHALL RF. INSPECTED DURING CONSTRUCTION IN ACCORDANCE WITH
<br />SECTION 4.0 OF THIaf! SPECIFICATIONS.
<br />3.5.7
<br />3.5.8
<br />3.0 RECLAMATION
<br />GENERAL
<br />RECLAMATION OF THE ROCK SLOPE. ENTRY PORTALS AND DEVELOPMENT ROCK
<br />DISPOSAL AREAS SHALL BE PERFORMED IN ACCORDANCE WITH THE
<br />CONSTRUCTION DRAWINGS AND ALL NOTES CONTAINED THEREON.
<br />RECLAMATION SHALL 13E CONSISTENT WITH THE EXISTING RECLAMATION PLAN.
<br />ALI, .AREAS WHICH ARE NOT MODIFIED BY THE ROCK SLOPE ENTRY PORTALS
<br />AND DEVELOPMENT ROCK DISPOSAL AREAS SHALL BE RECLAIMED IN ACCORD -
<br />ANCE WITH THE EXISTING RECLAMATION PLAN.
<br />VENTILATION SHAFTS
<br />VENTILATION SHAFTS SHALL BE BACKFA LLF.D TO THE EXISTING FAN LEVEL
<br />ELEVATION WITH DEVELOPMENT HOCK.
<br />ADDITIONAL ROCK OR SOIL SHALL RE USED TO MAINTAIN THE LEVEL OF THE
<br />SHAFT FILL AT THE FAN LEVEL ELEVATION IF THIS IS NECESSARY DUE TO
<br />SETTLEMENT OF' FILL.
<br />INTERIM RECLAMATION ()F THE VENTILATION SHAFTS SHALL BE IN ACCORD-
<br />ANCE WITH THE' FXISCIN(i I?F.CI.AMA'CIUN PLAN.
<br />TIIF; FAN I,E.A'E'I, SHALL RF RECLAIMED UPON FINAL ABANDONMENT IN ACCORD-
<br />ANCE WITH rill EXISTING HE:CI.AMA'I'IOS PLAN.
<br />ROCK SIOPI• -ENTRY PORTALS
<br />:11.1. PIPES. I'T'll ITY LINES, ETC. SI ;ALL BF REMOVED WHF:RF RE14UIRE:1)
<br />BFFUHF BA( " :.FILI.IN( ;.
<br />ROCK S1.0Pi INTRY PORTALS SHALI, BF HAFKFILLF.D WITH NON- COMBUSTIBLF
<br />MA'rE,HIA1, FOH A MINIMUM DISTANCE OF 25 FI• :FT FHOM THE PORTAL OPENINGS
<br />PE!1 :3O CFR. 75.1711 -2.
<br />THE. ROCK SLOPE ENTRY PORTALS SHALL RE BACKF 11.I.F.D IN .ACCORDANCE: WITH
<br />THF: RECLAIMED SLOPE. CONF'IGURA'TIONS IN "I'HI• FXISCING RECLAMATION
<br />PLAN.
<br />L'PON FINAL A..ANDONNFST, THE PORTAL AREAS SHALL BE RECLAIMED IN
<br />A(01RDAVCE WITH THE EXISTING RECl,AMATION P!.:AN.
<br />PORTAL LEVEL ROCK DISPOSAL AREA
<br />THE CONFIGURATION OF CONSTRUCTED DISPOSAL FILL SHALL, BF. THE.- SAME AS
<br />THE RECLAIMED CONF'IGURAT'ION, EXCEPT AS NOTED IN 3.4.2.
<br />PRIOR TO FINAL RECLAMATION, THE TOP OF THE FILL SHALL BE REGRADED
<br />IF NECESSARY TO ENSURE THE PERMANENT OVERLAND FLOW OF RUNOFF TOWARD
<br />THE PERMANENT DRAINAGE. CHANNEL NORTH OF THE FILL.
<br />SUBSEQUENT TO CONSTRUCTION OF THE FILL, FILL OUTSLOPES SHALL BE
<br />REVEGETATED IN ACCORDANCE WITH THE VEGETATION PLAN. VEGETATION
<br />SHALI. BE MONITORED AND IF VF.(;F.TATION GROWTH IS UNSUCCESSFUL, ADDI-
<br />TIONAL, COVER OF THE BEST AVAILABLE. MATERIAL OR SOIL 'TREATMENTS
<br />SHALL BE APPLIED.
<br />PARKING 1.01' ROCK DISPOSAL AREA
<br />THE C'ONF'IGURATION OF THE SURFACE AND OUTSLOPE OF THE CONSTRUCTED
<br />FILL SHALL RE THE SAME AS THE RECLAIMED CONFIGURATION, EXCEPT WHERE'.
<br />THE FILL IS REGRADED UPON FINAL ABANDONMENT FOR CONSTRUCTION OF A
<br />PERMANENT DRAINAGE CHANNEL.
<br />A 10 -FOOT (MINIMUM) HEIGHT BUTTRESS FILL SHALL BE CONSTRUCTED AT
<br />THF,'TOF OF THF. HOCK CUT AT THE NORTH END OF THE FILL. THE FILL
<br />BUTTRESS SHAi,I. HAVE A 2(H):I(V) OUTSLOPE.
<br />THE FILL BUTTRESS SHALL BE CONSTRUCTED BY PLACING FILL IN
<br />HORIZONTAL LIFTS NOT EXCEEDING 24 INCHES IN LOOSE THICKNESS AND
<br />CO',1PACTI•:D UNIFORMLY BY ROUTIN(; CONSTRUCTION EQUIPMENT OVER THE FILL,
<br />SURFACF.
<br />COMPACTED SOIL IN THE BUTTRESS SHALL HAVE A DRY DENSITY OF AT LEAST
<br />90 PERCENT OF THE MAXIMUM DRY DENSI'T'Y AS DETERMINED BY THE AASHTO
<br />T99 -74 SPEC IFI CAT U)`: ( "ST'A'NDARD PROCTOR ").
<br />UPON FINAL AHANDONMFNT, 4 PERMANENT DRAINAGE. CHANNEL, SIZED IN
<br />ACCORDANCE WITH THE EXISTING RECLAMATION PL =.N, SHALL BE CONSTRUCTED
<br />ACROSS THE F'I1A. SURFACF,, AS SHOWN 0'V THE CONSTRUCTION DRAWINGS, AT
<br />A MINIMUM DISTANCE: OF 5 FEE:'! FROM THE TOE OF' THE FILL BUTTRESS.
<br />THE EAST END OF THE FILL SHALL BE GRADED AT 10 PERCENT TO THE EAST
<br />FOR FINAL RECLAMATION SO THAT THE PEIIM.ANENT DRAINAGE. CHANNEL DOES
<br />NOT' DISCHARGE. OVF'R THE FILL OUTSLOPE.
<br />THE: PERMANENT DRAINAGE: CHANNEL SHALI, RE HIPRAPPED IN ACCORDANCE,
<br />WITH I'HE E:XIS'CIN•; RF.CI,AMATION PLAN WHERE ITS GRADIENT EXCEEDS 10
<br />PI:I(CF.sT.
<br />SUBSEQUENT TO CONSTRUCTION OF THE FILL, THE FILL OUTSLOPE SHALL RE
<br />REVEC;ETATED IN ACCORDANCE WITH THE EXISTING VEGETATION PLAN.
<br />VEGETATION ON THE FILLS SHALL BE MONITORED AND IF VEGETATION GROWTH
<br />IS UNSUCCESSFUL, ADDITIONAL COVER OF THE HEST AVAILABLE. MATERIAL OR
<br />SOIL TREATMENTS SHALL HE APPLIED.
<br />4.0 INSPECTION
<br />4.1 ROCK ENTRY PORTALS AND ROAD DRAINAGE
<br />4.1.1 CONSTRUCTION IN THE PORTAL. AREAS AND INSTALLATION OF THE SURFACE -
<br />WATER DRAINAGE SYSTEMS SHALL BE INSPECTED AND CERTIFIED AFTER
<br />CONSTRUCTION BY A QUALIFIED REGISTERED PROFESSIONAL ENGINEER.
<br />4.1.2 AN EXPERIENCED GEOTECHNI(It. ENGINEER SHALL RE PRESENT DURING CON-
<br />STRUCTION OF PORTAL FACEUPS TO ENSURE THAT THE FACEUPS ARE COM-
<br />PLETED IN ACCORDANCE WITH THESE SPECIFICATIONS.
<br />4.1.3 THE PORTAL AREAS SHALL BE INSPECTED DAILY WHILE ENTRY DEVELOPMENT
<br />IS WITHIN SOILS AND UNTIL THE ENTRIES HAVE BEEN DEVELOPED TO AT
<br />LEAST 150 FEET FROM THE PORTALS IN ORDER TO IDENTIFY ANY IN-
<br />STABILITY THAT MAY DEVELOP IN THE SLOPES IN THE VICINITY OF THE
<br />PORTAL.
<br />4.2 DEVELOPMENT ROCK DISPOSAL
<br />4.2.1 DEVELOPMENT ROCK DISPOSAL FILLS SHALL. BE INSPECTED BY A QUALIFIED
<br />REGISTERED PROFESSIONAL. ENGINEER.
<br />4.2.2 DISPOSAL INSPECTIONS SHALI. OCCUR QUARTERLY, BEGINNING WITHIN 7 DAYS
<br />AFTER FOUNDATION PREPARATION.
<br />4.2.3 IN ADDITION TO QUARTERLY INSPEC'T'IONS, SITFS SHALT, RE INSPECTED
<br />DURING, THE 1'()LLOWING CONSTRUC'T'ION PERIODS:
<br />A) COMPLET'IE)N OF FOUNDATION PREPARATION AND INSTALLATION OF PIPES
<br />OR OTHER STRUCTURES THAT WOULD 13F LOCATE _D WITHIN THE FILL;
<br />R) PLACEMENT AND COMPACTION OF FILL MATERIALS; AND
<br />C) RECLAM:ATU)N.
<br />4.2.9 211E ITISPEC2IIIG ENGINEERS' CERTIFIED REPORTS SHALL BE PROVIDED TO
<br />'tllE COLORADO MINED LAI1D RECLAMATION DIVISION WITHIN 2 WEEKS AFTER
<br />EACII INSPECTION. THE REPORTS EIILL CERTIFY THAT THE FILL HAS BEE14
<br />(:GNSTRUCTED AS SPECIFIED II) TINE DESIGN. A COPY OF THE REPORTS
<br />SHALL BE RETAINED AT TINE MINE OFFICE.
<br />Vf®4 f®
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<br />MANED �'DO ASA�N
<br />PEG�MA�AON
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<br />DAAM'h B D L ;.> -E N- /A 6ATE 3/27/87
<br />CHECKED GM EKE- Da Ho 873 -207 1
<br />D «� " 7 OF 7
<br />Golder Associates °' ' IIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIII
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