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J <br />II �I <br />,1 <br />I <br />1 <br />1 <br />ti <br />h <br />I � 1 <br />I/ I <br />II <br />I <br />I 1 <br />I ' <br />TOPSOIL PLACEMENT <br />PLAN <br />I° = 100' <br />TYPICAL SECTION <br />Ill _ O <br />II <br />1 <br />�I <br />I <br />III � <br />I'I ' <br />it � II <br />i <br />I <br />h <br />LE <br />0 <br />I J , <br />r� <br />�V t <br />X <br />v <br />t\ <br />y� 1 <br />ti <br />IL <br />I I — /17/ — <br />\MINE BENCH <br />i <br />I I 1 <br />r <br />SEDIMENT CONTROL <br />PLAN <br />i" = 100' <br />CONTOUR BENCH <br />DETAIL <br />I11 = 1, <br />DATEICHECKED <br />Designed by: T.D.M. <br />Drawn by: PJA <br />Checked by: <br />Approved by: <br />>PROXIMATE FOUNDATION <br />EZOMETER <br />LOCATION <br />EXISTING ROAD TO <br />BE RELOCATED ACROSS <br />MINE BENCH FILL,IF <br />NEEDED �� <br />31 LT FAA' \ I � j 1 <br />II <br />II <br />(11 <br />NOTES ON SEDIMENT CONTROL AND TOPSOIL PLACEMENT DURING CONSTRUCTION <br />1) <br />Initially topsoil will be stripped to a miniumum depth of 32" within three <br />areas simultaneously: <br />A) Proposed sediment pond area <br />B) Area of disturbance for East Roatcap Creek culvert placement <br />C) Area of disturbance relating to diversion of East Roatcap Creek while <br />placing culvert <br />2) <br />Sediment pond construction commencement will be in conjunction with <br />stripping of a minimum depth of 32" topsoil within the proposed mine <br />bench cut area. Subsoil excavation will not occur until the sediment <br />pond construction is complete and the cleanwater diversion channels are <br />complete. <br />3) <br />Earthwork construction will occur at rapid rate to which small thunder- <br />storms should produce no runoff or sediment loss. If on the event that <br />precipitation occurs to an extent at which sediment loss would occur or <br />construction is ceased, a drainage ditch extending from the sediment pond <br />to the south side of the mine bench would be constructed immediately. <br />4) <br />Topsoil placement of 4' depths on the outslope fill will be performed. <br />Sequencing will require approximately a 10' - 20' vertical depth of fill <br />to be developed, at which time 4 feet of topsoil will be placed to cover <br />the outslope. Mine bench fill will be then built up to approximately <br />another 10' - 20' height, topsoil will then be placed on the outslope, etc. <br />Revegetation, mulching and erosion control consisting of mats and silt <br />fences will be completed behind each topsoil placement interval. <br />5) <br />During earthwork construction, topsoil will be removed from the temporary <br />topsoil pile on both the east and west ends and placed on the outslope <br />R <br />fill so as to remain off subsoil excavation areas. <br />6) <br />Approximate topsoil pile yardages: <br />Nov 0 <br />Topsoil Starage Pile - 11,200 cubic yards <br />Temporary Topsoil Pile - 20,700 cubic yards"�M"' <br />^,-� U <br />�. <br />O.V.W.M. PORTAL <br />REVISION <br />*TOPSOIL PLACEMENT <br />SEDIMENT CONTROL <br />DATE: 10-3 -86 �JQ Golder Associates SHEET Na <br />l(\/ -�J CONSULTING GEOTECHNICAL ENGINEERS I OF 1 <br />SCALE: AS SHOWN 1 7301 WEST COLFAX AVE. SUITE NO.275 <br />GOLDEN,. COLORADO 80401 <br />1104 11 <br />