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. .. __ <br />ID:r~-689-3254 JUL 221 18:08 No .012 P.05 <br />T+bb 3. SUMMARY oP K8Y CHARACrfiRLtt1C5 OF IRONCLAD MATPRIAL THROUOII SCRaeN A~ D PP3tMBAHILTIY <br />TaiTS <br />SAMPIB NO. DATE SOURCa MAX SIZR (~ R < ]/~ CuJ x < 200 k (eM,ec) <br />405 177W Pus9Pib -IK 3.t 21.E 1.9x10' <br />406 IS lul 3' ~c,ccn -IK 16.5 17.3 <br />4-07 1S lul 7' xcnan J 13.7 16.7 <br />4-09 17JW S'K,een -1K 1.6 19.9 7.dx10' <br />x•10 19 Jul 3' xe,am •1 1.2 23.1 I.~YIO' <br />4-12 211W 3•.c.wa -IS 6.1 16.2 1.1x10' <br />Because the smallest screen opening Uult can be used on the screening plant is 3 inch and the <br />Largest particle size allowed with the new gradation specification is less than :; inch, some hand <br />picking of oversize pieces will be required on the fill. This hand-picking is to be required to <br />remove oversiu material. <br />As required by the conditions of the permit, permeability measurements will be performed on <br />samples of the soil liner fill at an interval of 1 test per 5,000 cu. yd. of fill. If it appears that <br />the permeability criteria of less than 1 x 1t1` cm/sec is being wnsistently demonstrated, the <br />testing frequency may be reduced to 1 per 15,000 cu. yd. at the discretion of the OML.R. <br />Your expeditious action on this modification is requested as further delay to the detoxification <br />and process of the Ironclad tailing will have a significant impact on t11e completion date of the <br />project. We took the liberty today of discussing this approach with Allen Sorenson. We believe <br />he encouraged its submission. <br />If you should have any questions or comments please don't hesitate to contact the undersigned. <br />Environmental Affairs <br />Attachments: (2) (Data sheets for (1) permeability and (2) sieve analyses) <br />~: ccelvsrlr.ooz <br />4 <br />