Appendix B- SWMP

                                                                                        23098 - SBSMP/2
                                                                                                 Page 13




All new stormwater pits are to be protected from sediment infiltration by wrapping new pits and
grates in geofabric or covering appropriately with timber board. Silt fences are to remain in place
during the maintenance period until the site is established (80% ground cover).

Potential sources of contaminants identified for the construction phase of the development are
outlined in Table 6-2 together with proposed stormwater quality improvement devices,
management and maintenance procedures.

                   Table 6-2 - Potential Contaminants and Proposed Treatments

                                                                                 Proposed Treatment
                                                       Management /
     Pollutant           Potential Source                                       Device and Maintenance
                                                   Maintenance Procedures
                                                                                       Procedure
   Sediment &         Excavated material, fill     Provision of sediment and     Sand filled filter socks.
     Eroded             material, exposed           silt barriers to the site      Removal of excess
    material           ground, stockpiles of        drainage entry and exit       sand/silt build-up at
                            material.                        points.              regular intervals and
                                                                                   after every storm.
       Dust           Stockpiles of material,      Covering the material or       Coverage of material
                         exposed ground.             wetting it down at          with plastic, geotextile,
                                                      regular intervals.        surface binding agents or
                                                                                    regular watering.
      Litter           Refuse generated by         Construction waste is to       Industrial bin is to be
                              staff.                be cleaned off the site        provided within the
                                                   area and disposed of into    construction area - to be
                                                     an industrial bin then       emptied on at least a
                                                      removed by a refuse             weekly basis.
                                                     collection contractor.
     Concrete          Washing of concrete         Provision of a closed area   Liquids to be removed by
                      trucks/tools to remove       onsite for washing off of       a waste collection
                      wet/unused concrete.             concrete slurries.        contractor. Solids to be
                                                                                placed into a refuse bin.
    Surfactants      Washing down operations        No cleaning of vehicles     Monitoring & prevention
   (detergents)      on hardstand area using       will be permitted on site.
                           detergents.
    Chemical         Typically this may occur        Where spills occur, the    A temporary containment
     (Paints,           due to spillage of           containment area is to          area. This is to be
  thinners etc.)             product.                   stop escape. The          impermeable and of a
                                                    material is to be treated           size to permit
                                                        (as required) and          mixing/transfer, and
                                                    removed and cleaned by      with a storage volume of
                                                     a licensed contractor.           twice the largest
                                                     Minor spillage outside            container used.
                                                   this area shall be cleaned    Treatment of spills is to
                                                       up with cloths and             occur on site. No
                                                    disposed of to waste via       discharge of treated
                                                       the industrial bin.      water to the stormwater
                                                                                     system is to occur
                                                                                without council approval.
                                                                                    Incidents are to be
                                                                                   reported to the EPA.
   Wastewater            Spillage from the           A licensed contractor         No leakage is to be
                     relocation of the existing    shall remove any residue      permitted to enter the
                      sewerage reticulation.         sewage from unused         groundwater or discharge
                                                   pipes and contaminated          to the stormwater
                                                    soils are to be disposed            system.
                                                   of via the industrial bin.

Site Based Stormwater Management Plan
Proposed Townhouse Development at 5 Pearl Street, Cooroy