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Vantage to Pomona Heights Chapter 2 <br />230 kV Transmission Line Project FEIS Proposed Action and Alternatives <br /> PAGE 2-36 <br />FIGURE 2-7 OPEN CUT TRENCHING (EPRI 2008) <br /> <br />FIGURE 2-8 UNDERGROUND CABLE CONSTRUCTION ROW WITH SINGLE CABLE <br />OPEN TRENCH <br /> <br />Underground Vaults <br />Large concrete vaults buried at regular intervals are required for underground construction. The primary <br />function of the vault is for pulling and splicing the cables during construction and for permanent access, <br />maintenance and repair of cables. For two sets of cables, two parallel underground vaults, approximately <br />9 feet wide by 28 feet long by 10 feet deep are required approximately every 1,500 to 2,000 feet. Figure <br />2-9 shows typical underground vault installation. Topsoil would be placed above the excavated subsoil or <br />engineered backfill material.