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Sub -grade Preparation <br />Timbering, stump removal, and topsoil removal will occur prior to disturbing additional lands. The <br />timbering and stump removal will be performed by local contractor with the timber removed from the <br />site. The topsoil will be removed in accordance with the topsoil plan and stored in the existing topsoil <br />storage pile. <br />The sub -grade preparation through 45-mil liner installation for the TSF is as follows: <br />1. Clear cut/log trees. Clear and grub organic matter including tree roots, pine needles, dead wood <br />and other deleterious materials. <br />2. Clear topsoil and place in topsoil stockpile for reclamation. <br />3. Cut and fill to design specifications using contractor selected equipment. Equipment can include <br />track dozer(s), backhoe(s), scraper(s), front end loader(s), road grader(s), sheep foot <br />compactor(s), or excavator(s). <br />4. Fill material will have top size of 6in and contain 50% silt and clay. <br />5. Fill will be placed in 10 -121n level lifts and compacted by a self - propelled sheep foot roller. <br />6. Fill will be placed at 95% of Standard Proctor dry density (ASTM D 698). <br />7. Fill will be scarified between lifts. <br />8. Fill will be moisture conditioned to within 2% of optimum. <br />9. Construction engineer will be on site to provide testing during fill placement. <br />10. Verify compaction of floor of pond by number of tests recommended by CTL Thompson. <br />11. Install ' _I:n-.�'' n-4 - <br />ai be tie :: pe;- cnn . .i . 1— aBentomat' DN geosynthetic Llity oHe <br />Imer or equi,,alent. <br />12. Install TexDrain "' TD 300 � eefflefflhRffle Y,itk drain leak detection drainage net system, or <br />ee ui�alent,gfid vN,ithm between the top layer of geosynthetic clay liner and the bottom of the 45- <br />mil reinforced polypropylene capable of intercepting liquid within the leak detection zone and <br />conveying the liquid to a collection sump for storage. <br />13. Install leak collection sump and piping in pond corner and connect g hr •n„ m • ' di--iin leak <br />detection drainage nct system (fief to the sump. <br />14. Lining contractor to install geosynthetic clay liner, leak detection drainage net system and 45= <br />mil reinforced plzolypropylene. <br />15. Liner materials will be tested at intervals specified by manufacturer and contractor but not less <br />than two tests will be performed. <br />16. Materials or construction not meeting standards and design specifications will be removed and <br />repaired. <br />TSF Stabilih' Analysis and TSF Design <br />The existing tailings embankment will be removed and the Phase 1 TSF embankment will be <br />reconstructed as shown in Exhibit TSF -02. The compacted fill embankment has a 2.5:1 (horizontal to <br />vertical) outside face, and a 2:1 interior face. Fill material will have top size of 6in and contain 50% silt <br />and clay. Fill will be placed in 10 -12in level lifts and compacted by a self - propelled sheep foot roller. <br />Fill will be placed at 95% of Standard Proctor dry density (ASTM D 698). Fill will be scarified between <br />lifts. Fill will be moisture conditioned to within 2 %n of Formatted: Right <br />Formatted: Font: 10 pt, Bold <br />Formatted: Font: 10 pt, Bold <br />D11990 -057 Mav 14,201 <br />