Data quality has been assessed and validated during data collection process. In accordance with general EPD® requirements the LCA study used specific, generic and proxy data. These last data are contributing to the environmental indicators less than 10%. "According to ISO 14040 and 14044, allocation is avoided whenever possible by dividing the system into sub-systems. When allocation cannot be avoided the criterion used consists in allocating on the basis of mass. Flows related to the production process have been normalised on the total plant production." "
Inventory flows contributing less than 1% of the total inventory were excluded; the consumption of water for washing the aggregates was excluded"