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REV97512
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Last modified
8/25/2016 3:21:51 AM
Creation date
11/22/2007 12:10:02 AM
Metadata
Fields
Template:
DRMS Permit Index
Permit No
M1989120
IBM Index Class Name
Revision
Doc Date
11/9/2005
Doc Name
Notice of Material to be Imported for Backfill
From
Aggregate Industries-WCR Inc.
To
DMG
Media Type
D
Archive
No
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Mr. Tom Schreiner, Division of Minerals and Geology <br />November 7, 2005 <br />Page Two <br />AGGREGATE <br />INDUSTRIES <br />above the estimated maximum local groundwater elevation. In addition, the final backfill <br />elevation in this area will be as neaz to the existing and surrounding ground elevation as <br />possible (depending on the availability of backfill material). Grading will create relatively flat <br />surfaces appropriate for industrial uses. Any slopes remaining will be reclaimed to a minimum <br />3H:1 V grade. As final slopes are graded, topsoil will be placed to provide a growing medium <br />for the revegetation cover used to stabilize the azea prior to the final land use. (p. 10, Exhibit E, <br />Platte Valley Pit Regulaz 112 Operation Reclamation Permit Amendment, July, 2003) <br />Clarification regarding reclamation in this azea was also provided in responses numbered 13 and 14 of <br />AI's December 1, 2003 response to the Division's adequacy review as follows: <br />13. The reclamation acreage has been clarified on the revised Exhibit F, Reclamation Plan map <br />attached. The groundwater lake to be created in Cells 2 and 4 will be approximately 55 acres in <br />size, or include roughly 40 percent of the proposed mined area. Other azeas of the mining pits <br />will be backfilled for wetland/upland and industrial uses. If the configuration of the proposed <br />groundwater lake changes, or the size changes by more than 25 percent of the proposed mined <br />area, the applicant will provide a technical revision to the Division with the final groundwater <br />lake size and configuration. <br />14. The proposed final land use for the Platte Valley site includes future industrial use. However, <br />it is not the intent of the operator to develop industrial use on the site. It is anticipated that <br />these azeas will ultimately provide for industrial use, because the areas are zoned industrial by <br />Weld County. The proposed amendment areas zoned for industrial use will be backfilled and <br />graded by the operator. The backfilling will include a cover of at least 6 inches of topsoil. The <br />azeas will be revegetated with native grasses to provide stability and minimize erosion until <br />future industrial land uses are applied. <br />In response to your question regazding the maximum amount of imported inert fill material that would <br />be stockpiled, waiting to be pushed into the excavated pit area at any one time, it is anticipated that <br />imported inert materials will be placed on the same day as they are received and not stockpiled. <br />Placement of inert fill will occur in an approximate one acre azea at any one time and will continue in <br />such area until the elevation of the backfilled area is in accordance with the permit, as noted above. <br />The original application materials for Amendment 1 indicated that inert materials would be used for <br />backfill, and AI responded to the Division's adequacy comment on this matter in the December 1, 2003 <br />letter as follows: "If applicable, the applicant agrees to provide to the Division with (sic) the <br />appropriate notices and affidavit certifying that the material used for backfill is clean and inert in <br />
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