What is class I backfill?

Structure Backfill (Class 1) Description: Graded material defined in Subsection 703.08 (a). 100% passing the 2 inch sieve. 30-100% passing the #4 sieve. 10- 60% passing the #50 sieve.

What is class II backfill material?

Suitable Backfill Material: For Class II backfill material, compact to at least 65% relative density. c. For Class III and Class IVA backfill materials, compact to at least 95% of Standard Proctor Density. Obtain required compaction within a soil moisture range of optimum moisture to 4% above optimum moisture content.

What is the best material to use for backfill?

CA7, otherwise known as ¾” limestone, or sometimes as 1” limestone, and commonly referred to as “bedding stone”, is an angular white/gray stone that self-compacts, making it ideal for use in backfill as well as pipe bedding, subbase and drainage situations.

What is Class 3 sand?

Class III: Clayey gravels and sands, poorly graded mixtures of gravel, sand, silt, and clay (GC, SC, and dual classifications, e.g., SP-SC): a.

What is backfill type B?

Class B backfill shall be any non-plastic, granular material, pit run gravel or sand, or non-plastic soil meeting the following criteria: 1) Shall have more than 90 percent by weight passing a 3/4-inch screen 2) Shall contain no rock, soil clod or hardpan fragment larger than 1-inch 3) Shall be free of humus, organic …

What is initial backfill?

Initial Backfill – Material surrounding and covering the pipe extending from the pipe bedding to six (6) inches above the top of pipe. Pipe Bedding – Material that provides support to the bottom of the pipe, measured from the bottom of the trench to the bottom of the pipe.

What are backfill materials?

Backfill materials can generally be graded as: Coarse grained soils – gravelly and sandy soils ranging from clay to gravel. Fine grained soils of low to medium plasticity – inorganic clays of low to medium plasticity, inorganic silts and very fine sands of low plasticity.

What size is type 2 aggregate?

Like Type 1, this is crushed stone less than 40mm in size down to dust but with a little more dust than type 1 and no specified grading. It usually contains finer material than type 1, being composed of fewer angular aggregate sizes also know as scalpings.

What material should be used to backfill around the Flo-well?

¾” to 1″ drain rock should be used to backfill around the Flo-Well. If the Flo-Well will not have vehicular traffic loading, then drain rock or any of the NDS EZ-Flow pipes can be used to wrap around the Flo-Well. The drain rock and the EZ-Flow have up to 40% void space that can be used for additional storage space for runoff.

What is engineered fill material?

Engineered fill is soil or crushed stone that is compacted and used as fill. Engineered fill has much to do with the placement and compaction of the material you are using and not just the material itself. Engineered fill is soil or crushed stone that is compacted and used as fill.

What are fill materials?

Fill Materials. Fill Materials typically consist of dirt, sand, clay, or recycled material. It is most commonly used to fill holes and depressions in the ground, to change the grade or elevation of land, or in landscaping and hardscaping projects to create a base for other materials used in ponds, waterfalls, and rock structures.