Clugston have a legal duty of care to apply the waste hierarchy on all site. The waste hierarchy requires that where possible waste is prevented from being produced, reused or recycled. By implementing a CL:AIRE Materials Management Plan on sites Clugston Construction Ltd successfully applied the waste hierarchy by preventing waste production or reusing site won materials.
The Knostrop site is based in Leeds on an existing Yorkshire Water Sewerage Treatment Facility. The site outside of the Clugston boundary is still in use by Yorkshire Water. The site consists of redundant filter beds, some of which is covered in a concrete hardstanding. As a result there was the potential to re-use huge quantities of site won material.
A CL:AIRE Materials Management Plan was put together by EMS. A CL:AIRE Materials Management Plan is used to provide evidence that the material has not become a waste or has ceased to be a waste once it has been suitably treated. The CL:AIRE Material Management Plan includes information on the objectives of the planned works, evidence of the suitability of the site won material, risk assessments, remediation strategy and quantity of use.
A total of 100,000m3 of material was excavated, crushed and reused. The material was re-used as fill to bring back up the ground levels to allow construction works to commence. Any material that was not required to raise the ground levels was used as backfill for roads and drainage works.
The re-use of site won material can have a huge financial benefit. In this section the cost of implementing a CL:AIRE MMP and re-using the site won material will be compared to the costs of disposing of the same material and purchasing virgin/recycled material instead.
The cost of implementing a CL:AIRE Materials Management Plan is split into: cost of its production, fees charges by the Qualified Person and CL:AIRE fees. The additional fees associated with this site included the production of a risk assessment, crusher hire, excavator hire and additional testing. The cost based on 100,000m3 of site won material being reused is £0.42/m3.
To calculate the cost of disposing of the material and bringing virgin/recycled material onto site an assumption has been made regarding the source location of the material. The cost of using virgin/recycled material is split into: cost of Type 1 and the cost of 6F5/6F2. The cost of disposing of the material is based on all the waste being removed by an 8 wheeler wagon. The cost of using only virgin material (Type 1 and 6F5), including waste disposal is £27.50/m3. The cost of using recycled 6F2 instead of 6F5, including waste disposal is £21.06/m3.
The sustainable benefits of reusing site won material include: reducing waste production, reducing virgin material demand and reducing transport requirements (of importing virgin/recycled materials and exporting wastes).
An assumption was made regarding which disposal site would have been used for the disposal of the material and where virgin/recycled material would have been sourced from. Based on the sole use of an 8 wheeler wagon for transport of waste/material it was calculated that 178 tonnes of CO2 would have been emitted. This is equivalent to driving an average car for 288 days non-stop or using a 42 inch LCD TV being used continuously for 122 years.