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REP09956
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REP09956
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Entry Properties
Last modified
8/24/2016 11:39:27 PM
Creation date
11/27/2007 12:17:02 AM
Metadata
Fields
Template:
DRMS Permit Index
Permit No
C1996084
IBM Index Class Name
Report
Doc Date
4/30/2003
Doc Name
1st Quarter 2003 Wastepile Certifications
From
Peak Project Management LLC
To
DMG
Permit Index Doc Type
Waste Pile/Fill Report
Media Type
D
Archive
No
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<br />INSPECTION OF EXCESS SPOIL FILL <br />First Quarter 2003 Certification <br />Fill Area No. 9 <br />Date: March 31, 2003 . <br />GENERAL DESCRIPTION OR REFERENCE TO SITE PLAN: <br />The CTL Thompson report dated April 27, 2001, "Stability Analysis and Geo-technical Recommendations <br />Lorencito Surface Mine Phase P' 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 Under-drains <br />Installation of Surface Drainage System <br />Construction of Fill <br />Placement of Topsoil <br />Seeding <br />X Other Mine idle - No activity during this quarter <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 fill areas is directed to this sediment control facility. <br />No evidence of significant erosion was observed. <br />SITE PREPARATION <br />As indicated by previous inspection reports, organic materials such as brush and trees were removed from <br />the proposed fill azea followed by topsoil removal prior to fill placement. Design criteria did not require <br />keyway cuts for steeper valleys with minimal soil cover (fill #9). <br />DRAINAGE SYSTEM (UNDERDRAINS) <br />Drain sizes aze specified by CDMG regulations for fills which can be classified as Valley Fills. Fill area #5 <br />is not a valley fill. CTL Thompson recommended a minimum 6' x 12' triangular section(area = 64 SF) for <br />this size fill. As indicated by previous inspection reports, as constructed drainages generally were more <br />trapezoidal with a top width of 12', bottom width of 8', and average height of 8' (area = 80 SF). <br />Sandstone recovered from durable "channel" sandstone deposits encountered during the mining process <br />were used in drain construction. Mirafi 160 fabric was used in lieu of filter material. <br />FILL PLACEMENT <br />CDMG regulations require that spoil be "placed in horizontal lifts in a controlled manner, concurrently <br />compacted as necessary to ensure mass stability". Maximum lift thicknesses are no[ specified. As <br />indicated by previous inspection reports, lifts were placed in accordance with plans specified by the CTL <br />Thompson report. Spoil material was transported to the fill area using a combination of trucks and dozers. <br />Left thicknesses of up to 50 feet were placed within the area removed from the fill face by more than 50 <br />feet. Fill placement terminated by second quarter 2002. <br />
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