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_ __ _ <br /> ~ ' , <br /> / <br />~; <br />7 _, <br />~r INSPECTION OF EXCESS SPOIL FILL <br />f, ~ Second Quarter 2002 Certification <br />Fill Area No. 9 <br />Date: . ' ,~ 7 2002 . <br />G;:.~~^.AL DESCRIPTION OR REFERENCE TO S[TE PLAN: <br />The CTL Thompson report dated April 27, 2001, "Stability Analysis and Geotechnical Recommendations <br />Lorencito Surface Mine Phase I" addresses the general requirements as also cited in Sections 4.09.1 to <br />4.09.2 of the Colorado Mined Land Reclamation Board for Coal Mining. <br />ACFIVITY DURING INSPECTION: ~1 <br />~rz~ /~cv~ ~~rL'~~~~ a(t LGC Z . <br />-Removal of Topsoil and Organic Matter <br />-Placement of Underdrains ~F ~~e s~i~ ~~ ~ G ~j <br />~~ <br />Installation of Surface Drainage System ~~ 09~+`~ ~ <br />X Construction of Fill ~ ~Lc+~ <br />Placement of Topsoil /" ~~t".c~es~/~ <br />Seeding ~~,Se'~' "_""" l~u.~-- Z7 Z~ ~/- <br />l <br />SEDIMENT CONTROL <br />Sediment pond construction has been completed in accordance with plans submitted to and approved by <br />the DMG and as-constructed survey/drawings certified by Registered Land Surveyor and Registered <br />Professional Engineer. All surface run-off from the fll areas is directed to this sediment control facility. <br />/Jv evt~c~ ~ eu~~sc~vr ~-.- fee ~e~,P~~~~ -- <br />SI'1"E PREPARATION <br />Organic materials such as brush and trees were removed from the proposed fill area followed by topsoil <br />removal. Design criteria did not require keyway cuts for steeper valleys with minimal soil cover (fill #9). <br />/I/v .ems-c.. ~~-~- ~.~ $~K~ s ai s~zP"~'`- °'` S/~-~- <br />-- Lv~cR-- o ~ ~~ , <br />DRAINAGE SYSTEM (UNDERDRAINS) <br />Drain sizes are specified by CDMG regulations for fills which can be classified as Valley Fills. Fill area #9 <br />is not a valley fill. CTL Thompsonrecommended a minimum 6' x 12' triangulaz section(area = 64 SF) for <br />this size fill. As constructed drainages generally were more trapezoidal with a top width of 12', bottom <br />width of 8', and average height of 8' (area = 80 SF). Sandstone recovered from durable "channel" <br />sandstone deposits encountered during [he mining process were used m drain construction. Mirafi 160 <br />fabric was used in lieu of filter material. <br />u <br />