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DRAIN ROCK <br />ASTM C33, NO. 67 GRADATION (3/4" TO NO. 4) <br />SLAKE DURABILITY INDEX GREATER THAN 90 PERCENT (ASTM D4644) <br />REFER TO REPORT FOR ACCEPTABLE ROCK TYPES. <br />FILTER MATERIAL <br />"CLEAN" COAL WASTE OR IMPORT. REFER TO DETAIL 6 FOR GRADING REQUIREMENTS. <br />FILTER FABRIC (MIRAFI 140N OR EQUIVALENT ) IS A SUITABLE ALTERNATIVE <br />--f- <br />2' MIN. <br />3' MIN. <br />JOB NO. 22,253 <br />6' MIN. <br />�1 TOE DRAIN <br />4 SCALE 1"=3' <br />5 DRAIN OUTLET <br />4 SCALE 1 " =3' <br />2' THICK FILTER <br />1 <br />SOIL COVER <br />DEPTH VARIES, PROVIDE <br />MINIMUM 2% GRADE TO <br />DAYLIGHT. <br />Permit Nurrer C - `C�s �- 05b <br />ulass Wermit <br />Section /Exhibit <br />Class: 0 Revision <br />- -- <br />Type /Se <br />pnil- <br />-Doc Class `rt'\0 ^Hydro❑ I n t/ Typ�-?�1 11-7-a-"—`--=-- <br />OApplication (Coal only) 0 Band 13 Enforcement ❑Ins <br />pection FILTER <br />*RDA TYPICAL DETAILS <br />ED INDICATES NAVFAC DM -7 FILTER GRADATION <br />REQUIREMENTS TO FILTER 3/4 -- INCH ROCK. <br />NOTES: 1. COAL WASTE WITHOUT - #28 SIEVE MATERIAL <br />MEETS FILTER REQUIREMENTS, <br />2. FILTER FABRIC (MIRAq 140N OR EQUIVALENT) <br />IS SUITABLE ALTERNATIVE. <br />s DRAIN FILTER REQUIREMENTS <br />4 <br />FIG. 4 <br />002575 <br />FABRIC <br />(MIRAF1 140N <br />• <br />• <br />OR EQUIVALENT) <br />�• <br />5 DRAIN OUTLET <br />4 SCALE 1 " =3' <br />2' THICK FILTER <br />1 <br />SOIL COVER <br />DEPTH VARIES, PROVIDE <br />MINIMUM 2% GRADE TO <br />DAYLIGHT. <br />Permit Nurrer C - `C�s �- 05b <br />ulass Wermit <br />Section /Exhibit <br />Class: 0 Revision <br />- -- <br />Type /Se <br />pnil- <br />-Doc Class `rt'\0 ^Hydro❑ I n t/ Typ�-?�1 11-7-a-"—`--=-- <br />OApplication (Coal only) 0 Band 13 Enforcement ❑Ins <br />pection FILTER <br />*RDA TYPICAL DETAILS <br />ED INDICATES NAVFAC DM -7 FILTER GRADATION <br />REQUIREMENTS TO FILTER 3/4 -- INCH ROCK. <br />NOTES: 1. COAL WASTE WITHOUT - #28 SIEVE MATERIAL <br />MEETS FILTER REQUIREMENTS, <br />2. FILTER FABRIC (MIRAq 140N OR EQUIVALENT) <br />IS SUITABLE ALTERNATIVE. <br />s DRAIN FILTER REQUIREMENTS <br />4 <br />FIG. 4 <br />002575 <br />