Refer to Figure 3.13. After the construction of a concrete retaining wall, backfill material from a nearby borrow pit was brought into the excavation behind the wall and compacted to a final void ratio of 0.8. Given that the soil in the borrow pit has a void ratio of 1.1, determine the volume of borrow material needed to construct 1 m3 of compacted backfill.

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FIGURE 3.13 Concrete retaining wall Excavation Compacted backfill (e = 0.8) Ground level Soils from borrow pit (e = 1.1)