HRP17305.L01.001 Irr

                                                                                       Stormwater Management Plan
                                                                                             Noosa Civic Car Wash




5           Conclusions

This Plan for the proposed QIC Noosa Civic Pty Ltd has addressed stormwater management requirements
based on the reviewed and summarised management practices.
The proposed changes from the existing include converting 200 m2 car park area to roofed area and retaining
125 m2 as is for customer car drop-off bays. Consequently, the change in impervious area is relatively negligible
since the proposal involves altering cover type from asphalt to corrugated roof. Further, the design proposes
discharging the stormwater to the same stormwater treatment device as the current arrangement. This is
considered appropriate due to the negligible change in impervious area and pollutant source type. Noting that
wastewater is to be managed appropriately and kept separate from stormwater.
The following summarises the stormwater management requirements:
1.     Car washing spaces are designed and managed so that grease and other substances are prevented
       from entering the stormwater system:
       a.     The wash water is collected and treated within the site; and
       b.     Refer to the Hydraulic Services Plan for details.
2.     Washing area must either be covered (roofed), exclude stormwater or be equipped with a stormwater
       diversion system:
       a.     Washing area is proposed to be covered by a roof;
       b.     Stormwater runoff from surrounding carpark areas is mitigated from entering the site by a
              continuous kerb (bunding) and planter on the “high” side of the washing area; and
              i.     Raised perimeter bund shall be at least 75-100mm; and
              ii.    Bund diversion shown in design drawing A200 Rev 2 (Dec, 2016).
       c.     Wash area design includes bunding at the entry and exits, which further prevents stormwater
              runoff from adjacent areas entering the washing area.
A design which incorporates these recommendations will be considered to meet current management practices
with respect to stormwater management.




HRP17305 | 27 February 2018 | Commercial in Confidence                                                         7