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REP01903
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REP01903
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Entry Properties
Last modified
8/24/2016 11:32:39 PM
Creation date
11/26/2007 10:06:57 PM
Metadata
Fields
Template:
DRMS Permit Index
Permit No
M1999098
IBM Index Class Name
Report
Doc Name
SLOPE STABILITY REPORT FOR RIVERVIEW RESOURCE
Media Type
D
Archive
No
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1 <br />' CNTRODUCTION <br /> Camas Colorado, Inc. proposes to excavate and operate a sand and gravel pit known as <br />' the Riverview Resources site. The Riverview Resources Pit is located in Weld County, <br /> Colorado south of "O" Street between 71s' and 83rd Ave. The proposed mining operation <br /> will extract gravel reserves from the property in some locations that are adjacent to man- <br />' made structures. The rules and regulations of the Division of Minerals and Geology <br /> require that any mining within a 200 foot setback of a man-made structure show through <br /> <br />' engineering analysis that the proposed mining will not cause damage. The accepted <br />method of demonstratin <br />this is tluou <br />lo <br />h a <br />e stabilit <br />anal <br />si <br />his r <br />ort c <br />t <br />i <br /> g <br />g <br />p <br />y <br />y <br />s <br />s <br />ep <br />on <br />a <br />ns a <br /> stability analysis of the mining highwall~and the embankment that is proposed for <br />' reclaiming the pit.. The report also provides a general overview of the reservoir, the <br />proposed embankment design, geotechnical results, and methodology, and conclusions <br /> and recommendations for construction of the reservoir. <br />' OVERVIEW <br /> The Division of Minerals and Geology mining plan, exhibit C, proposes that the property <br /> be mined in 6 cells. The reclamation plan, Exhibits F, proposes future use as water <br /> storage reservoirs, with the exception of cell 1 and cell 5 which will remain unlined. <br />~ <br /> Concurrent reclamation is planned in that the lake a bam~'nkmen~will be const- ruc <br />ted the <br />' mining progresses. The reservoir will cover an estimated 244 surface acres when full. <br /> Actual surface areas will depend on the final configuration of the reservoir after <br />' reclamation is complete. <br /> The proposed reservoirs will be constructed in a shallow alluvium stratum that varies in <br /> thickness up to a depth of approximately 40' for the proposed site. Underlying the <br />' alluvium is a relatively impermeable layer of siltstone/claystone. The bore log <br /> information (see attached) for this site shows that weathered bedrock (siltstone/claystone) <br /> was encountered at depths ranging from 15 to 40 feet across the site. This will serve as <br /> the foundation of the lake and will also provide some material for embankment <br /> consWction. <br />1 <br /> GEOTECHNICAL TESTING <br />1 <br /> In order to evaluate the slope stability of the proposed embankment, geotechnical <br /> investigations were performed to obtain the soil types and classifications for the onsite <br /> materials. Soil strength properties were estimated based on typical values for similar <br /> materials in this region.~Table 1 represents a summary of the results that were used in the <br /> stability analysis. <br />1 <br />1 <br /> <br /> <br />
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