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• INSPECTION OF EXCESS SPOIL FILL <br />Second Quarter 2006 Certification <br />Fill Area No. 9 <br />Date: June 12.2006 <br />GENERAL DESCRIPTION OR REFERENCE TO SITE PLAN: <br />The CTL Thompson report dated Apri127, 2001, "Stability Analysis and Geo-technical 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 />ACTIVITY DURING INSPECTION: <br />-Removal of Topsoil and Organic Matter <br />-Placement of Undertlrains <br />_Installation of Surface Drainage System <br />_Construction of Fill <br />_Placemem of Topsoil <br />Seeding <br />X Other Facility idle throughout the quarter <br />SEDIMENT CONTROL <br />Sediment pond construction has been completed in accordance with plans submitted to and approved by ttre <br />DMG and as-constructed survey/drawings certiSed by Registered Land Surveyor and Registered <br />• Professional Engineer. All surface nmoff from the fill areas is directed to this sediment control facility <br />]mown as pond 7. Pond 9A was dry at time of inspection. <br />SURFACE DRAINAGE <br />Armored Ditches line the east and west bormdary of the fill area Lateral ditches on the fill face direct <br />runoff to tlrese side ditches. No erosional problems were noted at the intersections of the lateral ditches and <br />the armored ditches. <br />SITE PREPARATION <br />As indicated by previous inspection reports, organic materials such as brush and trees were removed from <br />the proposed fill area followed by topsoil removal prior to fill placement Desigrr criteria did not require <br />keyway cuts for steeper valleys with minimal soil cover (fill #9). No evidence of springs or seeps was <br />observed during site preparation <br />DRAINAGE SYSTEM (UNDERDRAINS) <br />Drain sizes are specified by CDMG regulations for Ells which can be classified as Valley Fills. Fill area #9 <br />is not a valley fill. CTL Thompson recommended a minimum 6' x 12' triangulaz section(area = 64 SF) for <br />this size fill. As indicated by previous inspection reports, as constructed drainages generally were more <br />trapezoidal witlr a top width of 12', bottom width of 8', and average height of 8' (area = 80 SF). Sandstone <br />recovered from durable "channel" sandstone deposits encountered during the mining process were used in <br />• drain construction. Mirafi 160 fabric was used in lieu of filter material. <br />