Referenced Document - MCU30/0030 · MCU13/0030

APPENDIX 1:           PRELIMINARY STORMWATER QUALITY MANAGEMENT
                      PLAN



       GROSS POLLUTANT TRAPS I SEDIMENT & OIL ARRESTOR

ISSUES               PROCEDURES


                                             Design Phase

Objective            Ensure that the GPT’s I Sediment & Oil Arrestors are generally sized to suit final
                     catchment size on Works Plans.



Actions              The Consulting Engineer is to ensure that the GPT’s/Sediment & Oil Arrestors are
                     located in a suitable area, sized according to guidelines, have correct mesh size
                     and a high flow bypass specified with the appropriate erosion overflow protection.


Monitoring           The Consulting Engineer is to review the Works Plan prior to issuing For
                     Construction Plans.


Reporting            Works Plans are to be provided to consultants, developer and contractor.

                     Stormwater Quality Management Plan including maintenance details of proposed
                     GPT is to be submitted with works plans and provided to the building owner or
                     Manager.

Incidents            The GPT’s/Sed Traps are not approved according to submitted plans.


Corrective Actions   The Consultant will redesign the GPT/sediment & oil arrestors to address any
                     concerns of developer and contractors.


                     Major changes will require further Stormwater Quality Management Modelling.

                                        Construction Phase


Objective            GPT’s/Sediment & Oil Arrestors are installed correctly to allow treatment of
                     stormwater runoff prior to exiting into adjacent conservation land.


Actions              The Contractor will install the GPT’s/Sediment & Oil Arrestors in accordance with
                     the Works drawings and manufacturers specifications.


Monitoring           The Contractor will carry out weekly inspections of the GPT’s/Sed Traps (Including
                     during the defects liability period). The following will be examined at each
                     inspection:
                         .   Gross pollution build up

                         .   Oil build up

                         .   Sediment build up

                         .   Erosion at the inlet & outlet


Reporting            Records are to be logged and kept for verification of compliance on a need basis


Incidents                .   Gross pollutants clog intake.

                         .   Gross pollutants fill storage area to the maximum depth recommended by
                             the manufacturer.

                         .   Sediment builds up.

                         .   Oil builds up