Baldwin TD and Hicks TW, Assessment Calculations for Human ...

0977-6Version 1in the vaults after filling are shown in Table 5.2 (Egan, 2010; Paulley, 2010). Thestacking height changes across each vault to conform with cap profiling and this isreflected in the variation in waste volumes and the maximum depth of waste acrossvault grid cells, as shown in Table A.4 and indicated in Figure 3.1.Waste densities for the additional vaults are assumed to be the same as calculated forVaults 9 to 14. Material degradation will result in volumetric changes to the wastesand increases in bulk density. Paulley (2010) estimated the average bulk density ofmaterials will increase to 2,762 kg/m 3 after around 500 years and 2,812 kg/m 3 forfully degraded material. The human intrusion assessment is expected to be insensitiveto such changes in waste volume and density and therefore these changes have beenneglected. This is a cautious approach in that mixing of wastes with uncontaminatedmaterials is minimised for a specific depth of intrusion.Table 5.2 Additional vault waste properties. Data sourced from: Egan, 2010;Paulley, 2010; PIER V_2_3_a 19 11 10 ART AH.xls; PIER V_2_3_b 1911 10 ART AH.xls; and LLWR, LLWR Art 2010 Drawings, FutureVaults, Plan Showing HHISO Stacking – Case A, Revision C,7/06/2010 and Plan Showing HHISO Stacking – Case B, Revision C,13/07/2010.VaultInitialwastevolume(m 3 )Case AMaximumwastedepth (m)Initialwastevolume(m 3 )Case BMaximumwastedepth (m)Case Aand BEstimatedbulkdensity(kg/m 3 )Vault 15 153,000 9.52 202,000 10.88 2,569Vault 16 98,000 8.16 148,000 10.88 2,569Vault 17 122,000 8.16 136,000 9.52 2,569Vault 18 72,000 5.44 83,000 6.8 2,569Vault 19 67,000 5.44 83,000 6.8 2,569Vault 20 61,020 5.44 78,000 6.8 2,569Galson Sciences Ltd 15 21 March 2011