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Table 12 Threshold Water Levels (after Norfleet, 1999) <br /> <br /> <br />Piezometer Water Level <br />(Total Head) <br />feet <br />PZ-3B 7,328 <br />PZ-1 7,295 <br />INC-1 7,292 <br />A primary source of water into the slope is likely infiltration of rainwater and snowmelt. Another <br />identified source of water is the permanent pond located just below the headscarp south of the dam <br />and about 650 feet southeast of the access road. <br />9.1.3 Parameters <br />Field and laboratory testing data as well as model calibration (back-analysis) along with engineering <br />judgment were used to develop representative parameters for the analysis of the landslide adjacent to <br />Monument Dam. Laboratory data include reversal direct shear (RDS) testing. Table 13 summarizes <br />the shear strength parameters for slope stability modeling of existing conditions and proposed <br />remediation/stabilization measures for the landslide adjacent to Monument Dam. <br />Table 13 Summary of Strength Parameters for Landslide Stability Modeling <br /> Drained ESSA <br /> Mohr-Coulomb Residual <br />Material c' [psf) de ,' de . <br />Existing Materials <br />Colluvium* - - 14.0 <br />Failure Surface Material - - 14.0 <br />Weathered Bedrock^ - - - <br />Pro osed Materials <br />Buttress 0 32.2 - <br />'-see description in Section y.1.3.Z <br />^-This material was assumed to be infinitely strong in the model. <br />9.1.3.1 Unit Weight <br />Unit weights were selected based on saturated natural water content values from lab testing for <br />saturated unit weights and assumed water contents for moist unit weights. Table 14 shows the unit <br />weight values used in the analysis. <br />P:\Mpis\06 CO\26\0626067\WorkFiles\DesignReport\FINAL\DesignReportFINAL.doc 40 <br />