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<br />Table 3. SUMMARY OF KEY CHARACTERISTICS OF IRONCLAD MATERIAL THROUGH SCREEN AN D PERMEABILrrY <br />TESTS <br />SAMPLE NO. DATE SOURCE MAX SIZE (n) % < 3/4 (in) % < 200 k (cm/eec) <br />405 17 Jul Pug & Pilc -1'h 3.8 21.4 1.9x10' <br />4-06 IS Jul 3' ecrccn -1'h 16.5 17.3 <br />407 IS Jul 3' screen •3 13.7 16.7 <br />409 17 Jul 3' acrcen -1'h 1.6 19.9 7.8xI0" <br />410 19 Jul 3'ecrcen -1 1.2 25.1 1.4x10' <br />412 21 lul 3' acrcen •1.5 6.2 16.3 1.1x10' <br />Because the smallest screen opening that 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 oversize 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 1t78 cm/sec is being consistently liemonstrated, the <br />testing frequency may be reduced to 1 per 15,000 cu, yd. at the discretion of the OMLR. <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 the coml'letion 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 contaG the undersigned. <br />Environmental Affairs <br />Attachments: (2) (Data sheets for (1) permeability and (2) sieve analyses) <br />FILE: CC~VSTIP.002 <br />4 <br />