SECTION 704 - AGGREGATE FOR DRAINAGE
704.01 Permeable Material. Permeable material for use in backfilling trenches, under,
around, and over underdrains and permeable material for blankets or other subdrainage purposes shall consist of hard, durable, clean sand, gravel, crushed stone, or crushed slag, and shall be free from organic material, clay balls, or other deleterious substances. These materials shall be as designated by Type as set out below.
704.02 Type A Filter Material. Type A filter material shall meet the requirements for
Size 7 seal cover aggregate, or Size 7, 57, or 67 coarse aggregate for hydraulic cement concrete, or Size II gravel coarse stabilizer as set out in Section 703. The crushing requirement for gravel seal cover aggregate is not applicable.
704.03 Type B Filter Material. Type B filter material shall be concrete sand conforming
to the requirements of Subsection 703.02.
704.04 Type C Filter Material. Type C filter material shall consist of sand, stone, and/or
slag screenings composed of hard, durable particles reasonably free of injurious amounts of soft or flaky particles, dust, lumps, organic, or other deleterious substances. The gradation of the material shall be as follows: Sieve Size Percent Passing 1/2 inch 100 No. 4 80 - 100 No. 16 37 - 80 No. 50 5 - 30 No. 100 0 - 10
704.05 Type D Impervious Material . Type D impervious material shall consist of
natural soil, soil aggregates, or a blend of na tural soil and aggregates. The material shall be reasonably free of sticks, roots and other objectionable matter, shall be classified as
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