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<br /> <br /> <br /> <br /> <br /> <br />1 <br /> <br /> <br /> <br />1 <br /> <br />1 <br /> <br />1 <br /> <br /> <br /> <br />San Luu Project Phase [1 Raise 1 Expansion -Final Conawction Report <br />TABLE 1 <br />OU1' OF SPECIFICATION DRAINAGE BLANKET <br />MATERIAL PERMEABILITY <br />Sample Location Percent Fines Permeability (cm/sec) <br />DH-1 Acre -1 40.2 1.4 z 10; <br />DH-2 Acre - 5 49.4 4.2 x 10"s <br />DH-3 Acre - 8 41.2 5.7' x 10•s <br />The small azeal extent and limited amount of tailings associated with those areas containing out of <br />specification material will not influence the overall performance of the drainage blanket. Any <br />attempts to modify the areas would likely result in a less effective liner system through additional <br />construction activities. Removal of this material or in-place blending of the material would require <br />heavy construction equipment traffic increasing the compaction of the surrounding drainage blanket <br />material. Also, material removal, blending, and replacement activities aze likely to cause damage <br />to the synthetic liner; thus, additional extrusion seams will be required. <br />As the out of specification material Type 2 which was subjected to laboratory permeability testing <br />reflects material which is towazds the upper bound in terms of fines content, the extent of azeas <br />containing this material is small, and the peJmeabilities fall within the range for material Type 2 <br />which meets the specification, no corrective action was deemed necessary by the Engineer and the <br />material placement was accepted. <br />A summary of the results of all QA/QC testing for this material is presented in .Appendix C.2. <br />6.2.3 Liner Sub-base/Clay Liner Component <br />QA/QC testing of the liner sub-baseJclay liner component, material Type 3, consisted of gradations <br />and insitu density and permeability measurements. Gradation testing conducted on material Type <br />3 has indicated that only 4 out of 42 samples tested failed to meet the enact gradation specifications. <br />These samples were slightly deficient in the percent passing requirements for the coarse fraction and <br />do not represent a significant departure from the material which is necessary to create a suitable sub- <br />base for the liner. Furthermore, this material had been blended with other Type 3 material during <br />placement to result in material which met the specifications. <br />aY 16 Ject o. <br /> <br />