Environmental Statement volume 4 - Chiltern Evergreen3

Criteria for Appraisal of Magnitude of Impact4.6.7 The appraisal of the magnitude of impacts will derive from the extent orproximity of the proposed works to the resource or receptor, but will not takeinto account the importance or sensitivity of the resource or receptor which istaken into account in assessing the overall significance of effect (see below).Table 4.10Magnitude of ImpactMagnitude of Impact Description of ChangeComplete destruction or change to the site or feature resulting in aLargefundamental change in our ability to understand and appreciate theresource and its historical context and setting.Change to the site or feature resulting in an appreciable change in ourMediumability to understand and appreciate the resource and its historicalcontext and setting.Change to the site or feature resulting in a small change in our abilitySmallto understand and appreciate the resource and its historical contextand setting.Negligible or no material changes to the site or feature. No realNegligiblechange in our ability to understand and appreciate the resource and itshistorical context and setting.Criteria for Assessing the Significance of Effects to Cultural Heritage4.6.8 The severity of effect is dependent on:• the importance of the archaeological receptor; and• the magnitude of the impacts.4.6.9 The appraisal will be guided by the following matrix, which demonstrateshow the effects will be defined. It is important that professional judgement isapplied, so that the appraisal is flexible and realistic rather than being appliedmechanically.Table 4.11Level of Environmental EffectMagnitude of Value of ReceptorChange Very High High Medium Low Very LowHigh Severe Major Major Moderate MinorMedium Major Major to Moderate Minor MinorModerateLow Moderate Moderate to Minor Minor to NoneMinorNoneNegligible Minor Minor toNoneNone None NoneENVIRONMENTAL RESOURCES MANAGEMENT 60 CHILTERN RAILWAYS LTD