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2013-03-28_REPORT - M1977424
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2013-03-28_REPORT - M1977424
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Last modified
12/7/2018 3:50:29 PM
Creation date
3/28/2013 11:26:01 AM
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Template:
DRMS Permit Index
Permit No
M1977424
IBM Index Class Name
REPORT
Doc Date
3/28/2013
From
Occidental Oil Shale, Inc.
To
DRMS
Permit Index Doc Type
Annual Fee/Report
Email Name
SJR
SJM
Media Type
D
Archive
No
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Periodic inspections of the liner has not revealed any new open cuts or cracks near the water line. <br />It should be noted that water occurrences of significant depth have occurred in the vault during <br />the early winter to late winter season. <br />4.0 Reclamation Activities in 2012 <br />Reclamation activities conducted at the Logan Wash Mine in 2012 are discussed in the following <br />sections. <br />4.1 Revegetation Maintenance <br />During the reporting period the irrigation system for planted saplings on the Upper and Lower <br />Mine Dumps was not deployed. It is anticipated that irrigation system will not be used in the <br />future. No other revegetation work was conducted. <br />4.2 Well Abandonment <br />No monitoring wells were abandoned during the reporting period. <br />4.3 Daylight Bench Slope Stability Monitoring <br />The Daylight Bench was constructed to support sealing of the Daylight Portal in 2004. Tension <br />cracks and minor subsidence was first observed in 2009 on the small bench. Monitoring <br />established monuments on the bench began in 2011. To date, no significant slope movement has <br />been recorded as indicated in the following excerpt from the geotechnical consultant's 2012 <br />report. <br />Monitoring horizontal movement of observation points on the Daylight Bench indicates slight <br />movement of all monuments since May 13, 2011. The apparent movements appear to be random, <br />all contained within an area approximately the size of the actual aluminum cap. This movement <br />appears only as horizontal movement and is attributed to survey error. No significant vertical <br />movements have been observed for any observation monument. Because horizontal movements <br />have not verified by both monitoring methods, overall slope movement has not been significant. <br />If significant movements do occur, they will become evident with future monitoring. <br />5.0 Maintenance Activities <br />Maintenance activities included periodic inspections of mine roads, portals, mine water drainage <br />systems associated with the retorts and general mine workings, as well as the inspection of <br />Evaporation Pond facilities including the pond's security fencing, operation, and leak detection <br />system. Maintenance activities conducted at the mine and Evaporation Pond are summarized in <br />the following sections. <br />5.1 Mine Maintenance <br />Logan Wash Mine Annual Report <br />Permit No.: M- 1977 -424 <br />During the reporting period, inspections of the Logan Wash Mine site occurred on a weekly to <br />monthly basis during April 2012 through February 2013. The upper mine facilities are usually not <br />accessible from December through March due to deep snowpack and poor road conditions, but <br />light snowpack in early winter allowed reasonable access by vehicle and on foot. Inspections <br />focused on mine roads, headwalls, portal closures, bench surfaces, dump faces, constructed storm <br />drainage and rip -rap channels. Mine water discharge rates and Evaporation Pond water levels <br />were periodically monitored and recorded (Section 3.2). <br />Western Water & Land, Inc. 6 <br />
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