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RFI - Attachment H - Stormwater Management Plan_Issue C_
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Treated water and overflow from the proposed combined treatment / detention tank will discharge off
site via a proposed stormwater connection to the existing stormwater pits constructed as part of the
masterplan ROL.
The treatment plan for the proposed development is depicted on MPN Plan 7700-DA.01 attached in
Appendix 3, with MUSIC excerpt below.
The runoff from the basement subsurface drainage pump out sump will be treated to neutralise any pH
increases due to the acid sulfate soils prior to discharge from site. This system will be separate to the
treatment of the stormwater runoff from the exposed surfaces of the site which will be treated by the
filtration cartridges.
Figure 3 – Treatment Plan
5.3.3.7 MUSIC Results
The resulting percentage based load reductions at the outlet are shown in Table 5 below together with
the Water Quality Objectives for the receiving waters.
Sources Residual Load % Reduction Target %
Total Suspended Solids (kg/yr) 1,840 168 90.9 80
Total Phosporous (kg/yr) 3.97 1.25 68.5 60
Total Nitrogen (kg/yr) 29.9 16.4 45.3 45
Gross Pollutants (kg/yr) 208 0 100 90
5.3.3.8 POD Pollutant Reduction
5.3.3.8.1 Litter
Excellence with Economy in Engineering 13
l:\7000-7999\7700-7799\7700\reports\15-05-19 stormwater management plan_issue c.docx
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