Document DDqbYmjpJ7LGZBeR8R1e7v92Q

R18 guidance, page 46 The release estimation from landfill, needs to consider the residence time of the substance in the landfill body. The substance is continuously entered and accumulates into the landfill body until its closure. In the derivation of the default RF proposed in the Table R.18- 4, it is assumed that the average residence time is 20 years. Hence, the annual release factor of the substance during service life is multiplied by the residence time of 20 years to obtain the RFs for the landfill. It must be noted that when refinements are required this assumption and factors from ERC cannot be used. Refinements shall have to be based on measured data (where accumulation is integrated) or modelling from leachate testing53. Page 162 7.4.4 Derivation of release factor from shredding to water Emissions to water could only occur from shredding via leaching from dust emissions. As a realistic worst case assumption, the final release rate to air (0.000075) is multiplied with the release rate of the OECD ESD for plastic additives (outdoor service life, multiplied with 20 years of lifetime), which is 0.032. This results in RFwater,initial = 0.000075 * 0.032 = 0.0000024. No risk management measures exist for releases to water, hence the initial release factor equals to the final one: RFwater = RFwater,initial = 0.0000024