Attachment 6 - Stormwater Management Plan and Engineering Response. · MCU23/0078

                Table 1: Pollutants Typically Generated During the Construction Phase
  Pollutant              Source

  Litter                  Paper, construction packaging, food packaging, cement bags, off-cuts

  Sediment                Unprotected exposed soils and stockpiles during earthworks and building

  Hydrocarbons            Fuel and oil spills, leaks from construction equipment

  Toxic materials         Cement slurry, asphalt prime, solvents, cleaning agents, washwaters
                          (e.g. from tile works)

  pH altering             Acid sulphate soils, cement slurry and washwaters
  substances


                Table 2: Recommended MUSIC Rainfall-Runoff Generation Parameters
                                             Urban
Parameter                                                      Commercial               Forested
                                           Residential
Rainfall Threshold (mm)                             1                1                      1

Soil Storage Capacity (mm)                         500              18                    120

Initial Storage (% capacity)                       10               10                     10

Field Capacity (mm)                                200              80                     80

Infiltration Capacity Coefficient a                211             243                    200

Infiltration Capacity Exponent b                    5               0.6                    1.0

Initial Depth (mm)                                 50               50                     50

Daily Recharge Rate (%)                            28                0                     25

Daily Baseflow Rate (%)                            27               31                      3

Daily Deep Seepage Rate (%)                         0                0                      0


                     Table 3: Music Base and Storm flow Concentration Parameters