Construction Materials Methods & Techniques
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How to Do Your Landfill Cqa Up to the Start of the Construction Works
How to Do Landfill CQA up to the start of the Construction Works, which the construction contractor will then be required to follow, and which will once completed be reported upon to the environmental regulator.
The end goal is for the environmental regulator to agree that the landfill has been designed to the required high quality standard of construction, and grant the waste management licence, effectively allowing the site to open and start accepting waste materials.
Each CQA programme is specific to the site and the detailed design adopted.
The monitoring and tests to be carried out during construction should be appropriate to the materials chosen, and be focussed on the essential requirements for ensuring compliance with the specification, primarily ensuring that re barrier is as low in permeability in use as intended when designed.
So, you should base the most detailed checking on the results of the HRA just as the liner design itself will have been chosen to comply with the degree of engineered containment required by the HRA.
So, now that we have explained how site-specific variations can be very important and may change the CQA plan a lot, we shall describe the requirements for a typical CQA programme, including provision of the detailed as-built drawings and CQA report.
The early involvement of the consideration of CQA and availability of materials/constructability within the design/build process is invaluable in ensuring that the installation of the design can be carried out without unnecessary difficulty.
The designer must check that construction can be achieved without compromising design requirements.
Construction must also be devised to a programme and working methods to include only those geosynthetic configurations which can be properly monitored within the CQA programme.
A review by the CQA engineer to verify that the design methods and construction techniques chosen can be properly constructed and adequately monitored.
The CQA engineer then prepares the CQA documentation.
A crucial element in the CQA programme which sets out requirements for both the materials and the workmanship involved in the liner construction.
Now that the material has been chosen and described, the documents must provide the minimum requirements for fabrication of the selected material into a liner, and the programme of checks must be stated by the engineer.
The key to a really good design will be the extent of close co-operation between the design engineer and the CQA engineer.
There should then be a CQA Construction start meeting. The idea of this meeting is that it can be a valuable opportunity for the design engineer, CQA engineer and geosynthetic installation contractor to verify that all parties have the same understanding of the specification.
About the Author
Steve Evans has provided more leading information on Landfill CQA (landfill Construction Quality Assurance) at his blog. A full version of this article is available at Setting Up a Landfill Construction Quality Assurance Plan.
Goldsworthy Green Housing Technology
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