HYDRO23061 - Laserfiche WebLink

Home Browse Search

INSPECTION REPORT Site: National IGng Coal Mine, Hesperus, Colorado Inspected t3y: Don R. May, P.E., Project Engineer Inspection Date: Quarterly Inspection June, 2006 Ponds: Photograph 1 shows the west pond with some standing water. The inlets, outlets and embankments of both ponds were inspected and appear in good condition.. Both ponds are relatively dean of sediment and appear to have more than adequate storage volume. As mentioned in previous reports the staff gage marked relative to the required bottom elevation is missing from the west pond and a replacement would help the operator determine when and how much sediment removal is needed. Drainage Ditches: The drainage channels, on the north and south sides of the waste pile, appear in good general condition. Photo 2 shows the ditch that collects runoff from the top of the pile and photo 3 shows the ditch along the access road near the top of the pile. All other drainage channels on the site were inspected and are in good condition. Ditches and overland flow through and around the upper and lower yards are working well and both areas are in good shape. Care should be taken to keep all of the pipe inlets dear of sediment and debris. Except where noted, all drainage features have been constructed and are operating as stated in the drainage plan submitted to the Division of Minerals and Geology. Coal Waste Pile: The waste pile face appears stable and in good condition. The middle portion of the face of the waste pile is shown in photo 4. The section below the access ............................ .... .... mad appears steeper thf.•-~ :.~.~..-.'--°-- "--------.--~ "-::';:•;~• :^...*.ha.anrm;~ed design the Waste pile face My m""" found me aboveyeferenced report(s) • in campliana wim me followting CDRMS Regulations: ~c 4.05.9(1'n - Timety submittal of quarterly pond inspection report ~>~_ As discussed in previous: 4.05.9(1'n-Qualified d' ' r` slope has been over-sta.; p~ t '~ storage pile (photo 5). TI 4.05.9(t7) - Corrtent of qumteriy report (stnrchrral wwlmess, `` ' ~ • "d t0 Cr@8t@ 8 IOW retalnln9 j other hazardous conditions) followingsdtematiodiagE enrn,o,oo The bottom tier\of blodcrE T~°~ o~~~a°" :J • Tom Kaldenbech y~4rTM :~ key trends. SUCC@ssive t~ ~~i~nmemal Protection Specialist Date: S~t f~aG used to baddill the spaop DRlM3lmaalrre •en adjacent blocks will alloy: Fermk: C - 8 / - 03 ~~ e pressure that builds up ti c'"'° ~'d'O'~' . ;Type: Sedlmettt Pood Ioapettlom Q2 - bL :Name: Adegruey Memo The schematic diagram lTofO"'' aMryror ~I height) will depend on th'.... .!~ .............................................. ..... ~ ... ~ o uiiiionaM ra vs U10 VIVN\a'4tN Y1o Pn NYI1\ VI ow a~i u5~i i,dnt needed to return the face to the design slope. If the height of the retaining wall, above the driving surface, .exceeds six feet a more detailed stability analysis will be required.