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PERMFILE106953
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PERMFILE106953
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Last modified
8/24/2016 9:59:32 PM
Creation date
11/24/2007 2:28:33 PM
Metadata
Fields
Template:
DRMS Permit Index
Permit No
C1980007
IBM Index Class Name
Permit File
Doc Date
12/11/2001
Section_Exhibit Name
Exhibit 69 Section C I. Construction Approach & Construction Monitoring Program
Media Type
D
Archive
No
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I • The following table and attached figures present the results of the slope stability analysis using site <br />specific material distribution and groundwater levels and back analysis strength parameters for the <br />post construction and the post reclamation slope geometry. <br />Part 2 Field Monitoring Program <br />Prior to and during constmction a detailed field observation program will be implemented. This <br />observation program will apply to the entire project, rather than just those specific azeas of concern <br />for stability issues. A "Daily Log of Field Conditions" will be kept by MCC Construction <br />Management persorme] which will document information such as weather conditions, surface and <br />groundwater issues, wind and dust, excavation difficulties, site line observations, and other general <br />field conditions affecting the project. Site lines, in the form of wood lathe or steel posts will be <br />• installed approximately 10 feet above [he top of proposed cut slopes. Data from existing <br />piezometers will be collected at least weekly. Survey mirrors (laser prisms) installed outside the <br />construction limits will be monitored on at least a monthly basis, or more frequently in active <br />construction areas. <br />Site specific observations will also be made by MCC environmental and engineering professionals <br />and/or geotechnical consultants. These observations will focus on azeas, activities and conditions <br />related to slope stability and geotechnical design issues. The level of observations, and scope of <br />technical review by geotechnical specialists will be dictated by field conditions. At a minimum, <br />site specific observations at critical areas will be performed immediately following the first cut on a <br />slope, after significant precipitation events, if significant groundwater is encountered, or if any <br />movement of the slope is observed. Technical oversight and quality assurance inspections of <br />engineered fills and stabilized slopes will also be performed as these facilities aze constructed. <br />A weekly summary of observations will be prepazed by MCC which will incorporate information <br />from the daily log as well specific geotechnical observations and decisions made during the week. <br />Recent geotechnical information will also be incorporated into the weekly summary to provide a <br />complete record of activities and information applicable to stability issues within the SGFA. <br />Weekly summary reports will be made available at the Division request. <br />Part 3 Cut Sloae Construction Methodology <br />For designed cut slopes within identified slide zones, or in other cut slopes where potential stability <br />issues exist, top down or benched construction techniques, supplemented by slope monitoring and <br />water control measures will be employed. Excavation work will progress from the top of the slope <br />
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