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GENERAL38899
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Entry Properties
Last modified
8/24/2016 7:58:30 PM
Creation date
11/23/2007 9:53:30 AM
Metadata
Fields
Template:
DRMS Permit Index
Permit No
C1981016
IBM Index Class Name
General Documents
Doc Date
3/22/1999
Doc Name
EAST LANDSLIDE FIELD EXAMINATION OBSERVATIONS
From
J. Pendleton
To
DAN HERNANDEZ
Permit Index Doc Type
GENERAL CORRESPONDENCE
Media Type
D
Archive
No
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iii iiiii~iiiiiu iii <br />999 <br />DIVISION OF MINERALS AND GEOLOGY <br />Depanmeni of Natural Rewurces <br />131 1 Sherman SL. Rouen 215 <br />Denver, Coloratb 80'_03 <br />Phone: 13031 866-356: <br />FAX: {30J) B]'_~8106 <br />Date: March 22, 1999 <br />To: Dan Hernandez <br />From: Jim Pendleton <br />STATE OF COLORADO <br />~ ~ I , - <br />v' <br />DIVISION OF <br />MINERALS <br />GEOLOGY <br />RECLAMATION <br />MINING•SAFETY <br />Bill Ovens <br />Governor <br />Greg E. Walther <br />E>,ecutive Dvenor <br />Michael B Long <br />Re: HawksNest Eas andslide -Field Examination Observations Divi,~nr, Dire<inr <br />In response to your request, I visited the HawksNest East Mine's reclaimed surface facility area <br />on the afternoon of Tuesday, April 16, 1999. The Division forfeited the surety and reclaimed this <br />site over a decade ago. <br />A large pre-historic landslide has been active on this site throughout the twenty years I have <br />frequented the North Fork Valley. The landslide is a combination block glide and rotational <br />debris mass moving down slope from the sliding and toppling, ridge-forming sandstones up slope <br />to several tens of feet below the elevation of the roadway. This slide has progressively pushed <br />the alignment of old State Highway 133 down slope to the south towards the North Fork of the <br />Gunnison River. CDOT and Western Slope Carbon, Inc., repeatedly buttressed the toe of Che <br />landslide with large massive debris in an attempt to retard it's down slope movement. <br />Since the closure and reclamation of the HawksNest Mine and the construction of new State <br />Highway 133, old State Highway 133 has experienced drastically reduced traffic. The Sanborn <br />Mine uses the old highway to access its neighboring modern ventilation fari. It also uses the <br />access when unit trains are being loaded and obstruct its normal access. Local residents <br />occasionally use the old Highway. Frankly, until several years ago the landslide mass and the <br />adjacent down slope portion of the old Highway seemed to be drying and stabilizing. Last <br />week's examination discerned a significant rehydration of [he landslide mass. The increased <br />moisture is contributing to the general disintegration of the pavement and embankment of old <br />Highway l33 immediately down slope from the toe buttress of the landslide. Interestingly, the <br />landslide mass has not subsequently discretely failed. No obvious new failure plane is apparent <br />However, the disruption and strain failure of the pavement and road embankment has increased. <br />The landslide buttress is seeping water, at an apparently recently increased rate and volume. <br />Immediately up slope of the landslide mass is a distinct "dimple", reminiscent of an old <br />excavation, such as a portal. Within and immediately down slope from this "portal-like pocket" <br />a lush cat-o-nine tail wetland thrives, covering an area approximately 20' x I5'. A lush wetland <br />of long-bladed grasses exists in [he Swale which drains this wetland around and down [he slope <br />along the eastern boundary of the landslide mass. Based on the maturity of [he vegetation and <br />
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