Laserfiche WebLink
INSPECTION OF EXCESS SPOIL FILL <br />~~ Second Quarter 2002 Certification <br />~ Fill Area No. 8 <br />Date: r,,.¢, t~7 2002 . <br />GENERAL DESCRIPTION OR REFERENCE TO S[TE PLAN: <br />The CTL Thompson report dated April 27, 2001, "Stability Analysis and Geotechnical Recommendations <br />Lorencito Surface Mice 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 Boazd for Coal Mining. <br />ACTIVITY DURING INSPECTION: ~ <br />Removal of Topsoil and Organic Matter /tr~~t~-^--~ ~ wzt~ ~"`~ <br />Placement of Underdrains --~1~-. ,;~/~-~ <br />Installation of Surface DrainageSys[em /n~r`"~~~- "~~ ~" " '"~r.-c~~L,'~c~~SQ'~ <br />/Construction of Fill 1r~"""t~~`"'- ~~~~- ~/~%'~/" - "" "" <br />_Placement of Topsoil - ~~ Z 7 Zc~~ 2 <br />-Seeding t <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 rur!-off from the fill azeas is dir cted to this sed' a control facility. <br />/t/~Q .evr°~i~ei- ..e/'ci &~~^ ~r -v /' ^-~ ~ .S- (Y~z-/Gr9d1t-- <br />~(i~9(~ee,eeeNlr- Gc~s ~z,~z_ ~ ~~L~~ ~~~G'„`,~"~"~`s Oazst~' <br />c~L`aty- J j9Zt~r-H t t ( ~Z~ f~~ ~-Cf1~"'.`_ G~'(GViUS7c./f.~ r <br />,~ <br />SITE PREPARATION <br />Organic materials such as brush and trees were removed from the proposed fill area followed by tdpsoil <br />removal. Design criteria did not require keyway cuts for steeper valleys with minimal soil cover (fill #S). <br />No evidence o~~f99springs or seeps was observed during site_preparation. ~/~~<Z~-- <br />~.'o ~U'cstl/tiC~- ~ NHS tom.-~ Gea~J ~l~1li'' <br />r I___- /I <br />DRAINAGE SYSTEM (UNDERDRAINS) <br />Drain sizes are specified by CDMG regulations for fills which can be classified as Valley Fills. Fill area #8 <br />is a valley fill. CTL Thompson recommended a minimum 6' x 12' triangular section(azea = 64 SF) for this <br />size fill. As constructed drainages generally were more trapezoidal with a [op width of 10', bottom width <br />of l4', and average height of 8' (azea> 64 SF). Sandstone recovered from durable "channel" sandstone <br />deposits encountered during the mining process were used in drain construction. Mirafi 160 fabric was <br />used in lieu of filter material. <br />