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2009-10-16_PERMIT FILE - M2009082 (27)
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2009-10-16_PERMIT FILE - M2009082 (27)
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Last modified
8/24/2016 3:56:14 PM
Creation date
10/20/2009 9:21:12 AM
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Template:
DRMS Permit Index
Permit No
M2009082
IBM Index Class Name
PERMIT FILE
Doc Date
10/16/2009
Doc Name
Stability Analysis
From
Lafarge West, Inc.
To
DRMS
Media Type
D
Archive
No
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Phase 5B <br />The depth to bedrock in this area is greatest near the southeastern portion of the mining cell. Therefore <br />a worst case scenario is represented near the southeastern portion of the mining highwall of this phase. <br />The soil profile analyzed was based on a conglomeration of soil information from exploration locations <br />MW-9 and MW-10. The model analyzed; a soil overburden that was 4 feet thick, a sand and gravel <br />layer that was 10 feet thick, and a total pit depth of 14 feet. The highest groundwater monitored in the <br />area was in MW-9 approximately 8 feet below the ground surface. <br />An overburden stockpile was placed southeast of this mining cell. Flood irrigation, south of the mining <br />cell, was simulated by raising the piezometric surface, at the fenceline (70-feet from the mining <br />highwall), above the highest monitored surface to the ground surface. <br />Phase 5C <br />The depth to bedrock in this area is greatest near the southern portion of the mining cell. Therefore a <br />worst case scenario is represented near the southern portion of the mining highwall of this phase. The <br />soil profile analyzed was based on a conglomeration of soil information from exploration locations <br />PA04-BH10, MW-9 and MW-10. The model analyzed; a soil overburden that was 4 feet thick, a sand <br />and gravel layer that was 5 feet thick, and a total pit depth of 9 feet. The highest groundwater monitored <br />in the area was in MW-9 approximately 8 feet below the ground surface. <br />An overburden stockpile was placed south of this mining cell. No flood irrigation is near this mining <br />cell; therefore the piezometric surface was based on the site monitoring. <br />Longterm <br />This stability run uses the lithology of Phase IA. The soil profile analyzed was based on a <br />conglomeration of soil information from exploration locations ET02-BH06, ET02-TP03, ET02-BH05, <br />No. 1, No.2 and MW-3. The model analyzed; a soil overburden that was 9 feet thick, a sand and gravel <br />layer that was 21 feet thick, and a total pit depth of 30 feet. The highest groundwater monitored in the <br />area was in MW-3 approximately 10 feet below the ground surface. <br />Flood irrigation, north of WCR 641/2, was simulated by raising the piezometric surface, under the road <br />and in the borrow ditch just south of the existing road, above the highest monitored surface to the <br />ground surface. <br />The road is planned to be widened. The widening will result in the ditch being relocated southward <br />Parsons Mine <br />DBMS 112 Permit <br />Page SE6 of SE8
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