Page 111 - Bexley SuDS DESIGN & EVALUATION

9.7.5 Water quality design checklist

Information presented for
Item What is being checked
assessment Detailed Design
Method of Sensitivity of receptor and level of Design statement to specify method of
discharge treatment required discharge and sensitivity of receptor.

Treatment Sufficient treatment in place protecting Layout drawing clearly indicating SuDS
site biodiversity and amenity assets and components and management train.
the wider environment. Details of Indices approach and
Evidence of source control, subcatchments infiltration screening assessment (as
and management train. appropriate).
Infiltration Presence of SPZ’s, contaminated land, Coordinated constraints plan. Evidence
depth to seasonal high groundwater table. of discussion with EA where appropriate

Construction Demonstration of how site runoff could be Section of the drainage design
phase managed during construction to minimise statement outlining a potential approach
the risk of pollution to the wider for construction runoff management.
environment due to silty construction Contractors will be responsible for
runoff. uptake.
Operation and Operation and maintenance should be Concise operation and maintenance
maintenance simple to understand and easy to plan. Description of tasks and detailing
plan implement. Where available, SuDS design of where personnel are required to visit
should deploy natural treatment process site to remove hydrocarbon based 106
to breakdown organic pollutants passively. pollutants (i.e. organic pollutants have
Contingency measures in the event of a not been fully broken down passively as
minor / major spillage part of SuDS treatment process).
Plan indicating potential for containment
and positioning of spill kits (as
appropriate)

London Borough of Bexley SuDS D & E Guide © 2018 McCloy Consulting & Robert Bray Associates