1209 SWQMP Report_3 2013

                                                                                        Callaghan & Toth

                                             Construction Phase

Objective                The Contractor will install the Bioretention System in accordance with the
                         Operational Works drawings.

Actions                  Bioretention systems to be constructed at the end of civil works for the
                         development.
                         Bioretention systems used for sediment basins during civil works construction
                         shall have sediments removed prior to layout of bioretention zone.
                         Construct Bioretention systems in accordance with steps as detailed in “Water by
                         Design – Construction and Establishment Guidelines: Swales, Bioretention
                         Systems and Wetlands” Version 1 dated February 2009.
                         Contractor to conduct regular watering of all planted bioretention systems until
                         such time as plants are established.
                         Contractor to ensure bioretention systems are protected from sediment laden
                         stormwater runoff during construction period or only install once upstream
                         catchment is stabilised.

Monitoring               The Contractor will carry out weekly inspections of the Bioretention system
                         (Including three monthly during the defects liability period). The following will be
                         examined at each inspection:
                         ¾    Sediment build up on the surface
                         ¾    Health of vegetation
                         ¾    Pondage during major storms not infiltrating into the sand
                         ¾    Erosion at the outlet
                         ¾    Pondage during minor storms

Reporting                Contractor to maintain a log of inspections, watering and other actions.
                         Records are to be logged and kept for verification of compliance on a need basis.
                         Bio-retention designer / Engineer shall perform inspections during construction
                         stage and fill out Water by Design forms for compliance.

Incidents                ¾    Bioretention systems not installed correctly
                         ¾    Sediment builds up on the surface of systems.
                         ¾    The vegetation dies off.
                         ¾    Pondage of water is in excess of one hour.
                         ¾ E rosion occurs.
                         ¾    Pondage of water occurs at every minor rainfall event.
                         ¾    Weed growth occurs.

Corrective Action        Contractor to amend installation to ensure it complies with Operational Works
                         drawings.
                         The Contractor will check up stream sediment control and fix failures. The
                         sediment build up will be shovelled off the non-woven geotextile of the
                         Bioretention systems. The geotextile will be replaced at the beginning of the
                         defects liability period
                         Unsuccessful plantings will be replaced as required. A normal allowance of 10%

                                                                                                       C
1209 Animal Husbandry – Top Forestry Rd, Ridgewood                                    SWQMP_REV_3
SEPTEMBER 2013