HDPE backfill details in AutoCAD, dwg file.

This Architectural Drawing is AutoCAD 2d drawing of HDPE backfill details in AutoCAD, dwg file. Backfill is the material used to refill an excavated hole or trench in your yard. This material can be the excavated soil, a mixture of sand and gravel, or commercial products. The process of backfilling usually takes place in layers. Different materials have different properties.