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REP41355
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REP41355
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Entry Properties
Last modified
8/25/2016 12:43:13 AM
Creation date
11/27/2007 9:00:43 AM
Metadata
Fields
Template:
DRMS Permit Index
Permit No
C1981038
IBM Index Class Name
Report
Doc Date
11/30/1990
Doc Name
WEST RIDGE WASTE PILE REPAIR PLAN PN C-81-038
From
CYPRUS ORCHARD VALLEY
To
MLRD
Permit Index Doc Type
Waste Pile/Fill Report
Media Type
D
Archive
No
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Along with this process additional work will be done on expanding <br />the foot print of the pile. This expanded area has already been <br />approved with the original approval of the waste pile configuration <br />and does not require additional permitting. The undisturbed area <br />upslope of the waste pile will have the vegetation removed and then <br />the topsoil will be stripped from the site. The topsoil will be <br />hauled to either an existing topsoil stockpile, or will be directly <br />reapplied to a prepared slope of the waste pile. After the topsoil <br />has been removed the subsoil will be either hauled to a stockpile <br />or redistributed over a prepared slope of the waste pile. <br />The existing access road into the pile will be utilized to haul in <br />waste rock as it is generated. In order to access the newly <br />prepared area two 36 inch culverts will be installed in the ditch. <br />These culverts are designed to handle the 100 year event, although <br />they will be removed once the West Ridge pile construction is <br />completed. I have attached a copy of the design for these <br />culverts.I do not believe this requires any further permitting, but <br />let me know if you think an additional technical revision is <br />required. <br />In reference to the compaction tests I have included a copy of all <br />the results from fall, 1989 through November, 1990. The latest <br />series of results indicate that adequate compaction was achieved <br />during the reworking of the pile. During the early months of 1990 <br />testing was not completed due to the inability to get accurate <br />results with the instruments used for the test. It would have been <br />beneficial if testing could have occurred, as COV would have been <br />saved the time and expense of repairing the pile. The proposed <br />winter construction procedures outlined below should eliminate this <br />testing problem. <br />Cyprus Orchard Valley will alter the pile construction procedure <br />during the winter months. During the winter period the gob <br />material will be dumped onto the existing compacted lift. The <br />dumped gob will remain as is until weather conditions are favorable <br />for spreading and compacting the material. During the winter <br />months it is difficult to achieve the required compaction due to <br />freezing and thawing conditions. Once favorable conditions exist <br />the gob will be spread out in no more than two foot lifts and <br />compacted to the specifications detailed in the permit. After the <br />material is compacted the construction of the pile will proceed as <br />per the permitted plan. <br />In regards to the discrepancy in the 2nd quarter report, I believe <br />a terminology misunderstanding resulted in stating the pile was <br />constructed per the plans. The pile was constructed in two foot <br />lifts, however as discovered by drilling the lifts were not <br />adequately compacted. The construction methodology was in <br />compliance with the plan, however required compaction was not <br />achieved. Also, the consultant forwarded the report directly to <br />the Division, therefore, COV did not have time to review same so <br />that internal inconsistencies would be eliminated. I believe we <br />have progressed pass this problem with report writing and do not <br />
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