Environmental Statement volume 4 - Chiltern Evergreen3

not found.. This will be used to determine the significance of impacts arisingfrom construction dust deposition on sensitive receptors.Table 4.14Evaluation of Potential Significant Impacts of Dust DepositionDuration of On-site Dust RaisingActivityDistance from Site Boundary to Sensitive (a) Receptors(m)< 50 m 50 – 100 m > 100 m> 12 months Significant Significant Potentiallysignificant6 – 12 months Significant PotentiallysignificantNotsignificant< 6 months Potentially significant NotsignificantNotsignificant(a) Sensitive receptors defined as residential, commercial, hospitals, etc.4.8.3 In addition to on-site construction activities, construction traffic will travelalong access roads to the construction site(s). There are potential receptorsalong these routes sensitive to dust. It is considered that re-suspended dusthas the potential to cause some nuisance impacts to properties within 50 m ofthese routes, if no measures are taken to prevent the transfer of dust and mudonto the surrounding roads.4.8.4 The potential for changes in CO 2 emissions will be considered taking intoaccount rail kms undertaken with the scheme in place compared to thesituation in the absence of the scheme. Appropriate emission factors will beused (taking into account assumptions about the mix of primary powergeneration technologies), and account taken of any modal transfer from roadto rail.4.9 LAND QUALITYMethodology4.9.1 In order to assess the potential impacts of the Scheme on the geology andhydrogeology of the Site, a baseline assessment will be undertaken. Thisinvolves reviewing available information on the geology and hydrogeology,assessing the geological conditions and, therefore, assessing the groundwatervulnerability and sensitivities of the area.4.9.2 Data will be collated from the following sources, where available:• aerial photographs, if available;• Catchment Abstraction Management Strategies, River Basin ManagementStrategies and associated documents;• geological maps, both solid and drift geology;• hydrogeological maps;• groundwater vulnerability maps;• soil survey maps;• publically available historical land use maps;ENVIRONMENTAL RESOURCES MANAGEMENT 65 CHILTERN RAILWAYS LTD