Supplier From Quezon, Metro Manila, Philippines Armour Rock, Boulders, Coarse and fine aggregates, suitable for use in bituminous paving mixtures, consist of hard, tough, durable natural river rocks shall be processed, by crushing, screening, and .
Since both contain sand and gravel, it is assumed that the material is consistent between the two pits. Two other test pits, C and D, are dug. The new pits are 300 feet apart. If all the test pits show sand and gravel, it is assumed that the entire area, 300 feet by 300 feet contains sand and gravel.