Melbourne Regional Landfill Evapotranspiration Capping

Scope of Works

• Subgrade trimming & preparation.
• Placement and compaction of 1.5m non-descript crushed rock (NDCR) in layers at varying specified densities, across 12 hectares.
• Supply and installation of 100mm vegetative growth medium.
• Supply and establishment of vegetation.
• Supply of materials and construction of 3 no. lysimeters.

Method

Shamrock opted for tractor-towed tandem scraper buckets to haul and place the 200,000m3 of material, a methodology which has been used effectively on previous projects. This highly efficient, self-loading method allows cartage of up to 45m3 per unit and ensures even layer placement across the cap. Multiple settlement plates confirm minimum thicknesses are achieved on top of the ever settling landfill. A single laser bucket manages the work areas and is involved in all aspects of the job. This multipurpose tool maintains haul roads, carts material to congested areas and de-compacts & conditions the NDCR as required. A positrak with spreader bar ensures even placement around the gas risers and batters. The lysimeter construction consists of lined, bunded pads with an outlet gauge measuring the effectiveness of the evapotrans cap. Lining Victoria were engaged to carry out the lining and welding works. A large focus has been placed on achieving a successful vegetative growth layer. SCE’s close relationship with environmental remediation experts Virotec, will ensure their expertise and scientific analysis achieves an unrivalled strike rate.