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C-3 and C-4. Upon reclamation these drainages will be rerouted <br />• across the reclaimed tailings surface as discussed in Exhibit <br />E Reclamation Plan. <br />D.6.3 Site Material Characteristics <br />During June and July 1988, a total of seven test pits <br />were excavated in the tailings disposal area. Three boreholes <br />were also drilled in this area. Logs for the test pits and <br />boreholes, as well as an exploration location map are contained <br />in Appendix C of the approved permit. Standpipe piezometers <br />were installed in boreholes BH-6 and BH-8 as pari. of the field <br />exploration program. The completion detail<.~ for these <br />piezometers are included in Appendix E of the approved permit. <br />A geotechnical laboratory testing program was completed on <br />selected samples taken from the test pits and boreholes. The <br />results of the laboratory testing program are included in <br />Appendix D of the approved permit. <br />• Based on the results of the subsurface exploration <br />program and the geotechnical laboratory program, the subsurface <br />profile in the vicinity of the tailings disposal facility <br />consists of relatively deep deposits of alluvial sediments, <br />composed predominantly of poorly consolidated silty and <br />gravelly sands with a measurable higher silt content and lower <br />gravel content in the near surface soils located in the upper <br />five to ten ft of the profile. Natural clay content is <br />generally low in all of the native soils with the majority <br />occurring in discontinuous pockets of topsoil and as scattered <br />lenses interbedded with sands at depth. Relatively clean sands <br />and gravels exist locally where intermittent stream action has <br />occurred. Higher up on the slopes, the Santa Fe Conglomerate <br />is exposed. Hard, non-rippable bedrock materials were not <br />encountered in any of the boreholes or test pits. <br /> <br />D-24 <br />