Including the closely related term carbon.
… Total suspended solids Metals Hydro- carbons Residential Roofs Very low 0.2 0.2 0.05 Other roofs (commercial/industrial) Low 0.3 0.21 0.05 Individual property driveways, residential car parks, low traffic roads and non-residential car parking with infrequent change (eg schools, offices) <300 traffic movements/day Low 0.5 0.4 0.4 Commercial yard and delivery areas, non…
… suspended solids Metals Hydro- carbons A layer of dense vegetation underlain by a soil with good contaminant attenuation potential of at least 300mm in depth 0.6 0.5 0.6 A soil with good contaminant attenuation potential of at least 300mm in depth 0.4 0.3 0.3 Infiltration trench (where a suitable depth of filtration material is included that provides treatment, ie graded gravel…