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Specif~cetions <br />Revised <br />SUMMARY OF OPINIONS ON PHASE II - RAISE I ISSUES <br />WWL k390 . <br />November 1, 1993 <br />Material/Issue Specifications Design Intent Opinion Recommended Action <br />Drainage blanket Out of specs for maximum size Drainage layer permeability hiahar Than Draina a yer acceptable Remove oversize material and material <br /> and fines (in several areasl• tailings; Protection of VLDPE liner. ith actin with >35°.6 fines; check mixing of <br /> _.r <br />materials. <br />Drain pipe spacing Approxirnate 40 toot sp i g7 <br />f ~ Shorten drainage path; Reduce head on Drain pipe spacing Verify spacing where possible. <br /> Y <br />L liner, acceptable. <br />Low permeability Moisture content out oT spec Permeability <10"A cm/sec. Field testing shows Confirm acceptable correlation <br />liner (too dryl; Permeability <10-° acceptable permeabilities. between field and laboratory values. <br /> cm/sec. <br />Phase II raise Out of spec for Type 1 Shear strength, piping protection, and Type 4 materiel currently Use Type 4 material with additional <br /> material (maximum size and drainage. used. ~ monitoring (additional piezometersl. <br /> finesl• <br />