Environmental Statement volume 4 - Chiltern Evergreen3

classes: RE1 (high quality) to RE5 (low quality) with an additional unclassifiedlevel for watercourses suffering from considerable pollution. No legalrequirements are directly associated with RQOs.Both EQSs and RQOs are based primarily upon chemical quality and areapplied to particular watercourse reaches.G1.3 DANGEROUS SUBSTANCES DIRECTIVE (76/464/EEC), DAUGHTER DIRECTIVES ANDTHE SURFACE WATERS (DANGEROUS SUBSTANCES) (CLASSIFICATION)REGULATIONS, 1997 AND 1998The Directive and regulations detail the approach to be taken with respect totwo categories of substances: List I and List II. Pollution by substances withinList I must be eliminated, whilst pollution by List II substances must bereduced. Emission Limit Values (ELVs, also known as Uniform EmissionStandards, or UESs) and EQSs have been established by a series of daughterDirectives. EQSs for List II substances have been set by the UK within theSurface Waters (Dangerous Substances) (Classification) Regulations, 1997 and 1998.The Dangerous Substances Directive will be repealed by the WFD in 2013. Thetransition requires a daughter Directive, named the Priority SubstancesDirective, which is currently in proposal by the European Commissionawaiting approval by Member States and the European Parliament.G1.4 URBAN WASTE WATER TREATMENT DIRECTIVE (91/271/EEC) AND THE URBANWASTE WATER TREATMENT REGULATIONS, 1994Specific emission limits for discharges are established under the Urban WasteWater Treatment Directive. This Directive and the transposed regulationsrequire emission standards or percentage reduction targets to be met foreffluents (based upon BOD and suspended solids).G1.5 THE ENVIRONMENT ACT 1995, WATER RESOURCES ACT 1991, LAND DRAINAGEACT 1991, ENVIRONMENTAL PERMITTING REGULATIONS 2008 AND THE THAMESWATER AUTHORITY LAND DRAINAGE BYELAWS 1981Under the Environment Act 1995 it is an offence to discharge poisonous,noxious or polluting material into any ‘controlled waters’ either deliberatelyor accidentally. Polluting materials include silt, cement, concrete, oil,petroleum spirit, sewage or other debris and waste materials. ‘ControlledWaters’ include all watercourses and water contained in underground strata.Road drains and surface water gullies generally discharge into controlledwaters and should be treated as such.The Water Resources Act 1991, together with changes under this Act by theWater Act 2003, requires consents to be obtained for any discharges tocontrolled waters. The Land Drainage Act 1991 states that consent (now knownas Flood Defence Consent, FDC) will be required for works affecting drainageditches along the route and for any works in, over, under or adjacent to MainRivers. FDC is also required under this Act to construct culverts or impoundwaters. Applications to the Competent Authority are required, which isENVIRONMENTAL RESOURCES MANAGEMENTG1-4CHILTERN RAILWAYS