Section 4134. Floodable Backfill Material
Uncrushed natural sand and gravel or natural sand.
A. For natural sand and gravel use Gradation No. 1 or Gradation No. 35 of the Aggregate Gradation Table, Article 4109.02.
B. For natural sand use Gradation No. 36 of the Aggregate Gradation Table, Article 4109.02.