FINAL Response to Information Request_ 03.05.2016

discharge from the lake. In addition, the residence times within the lake are critical for management of
algae and cyanobacterial outbreaks.

Information Required

     11. Demonstrate how predevelopment ARI velocities will be maintained to ensure waterway stability
         pursuant to the State Planning Policy and how water flows will be managed to adequately manage
         residence times within the lake system.

Response


Refer to attached letter dated 21 April 2016 prepared by Morgan Consulting Engineers, which addresses this item.


Issue – Stormwater Treatment

The only proposed method for treatment of pollutants within stormwater within the site is for incorporation of
a Gross Pollutant Trap. Unless properly maintained the Gross Pollutant Traps are renowned for generation
and release of nutrients. This could cause problems to the receiving lake system which is very sensitive to
nutrient balances for management of algae and cyanobacteria outbreaks. There is also concern the
proposal for no nutrient treatment could result in neighbour disputes in the future in the event of a nutrient
related issue within the lake system. Furthermore the State Planning Policy requires that all new
developments demonstrate at least a 80% reduction in Total Suspended Solids, 60% Reduction in Total
Phosphorous and 45% reduction in Total Nitrogen.

Information Required

12        Demonstrate how nutrients within stormwater runoff will be managed to ensure that the proposed
          development will not be responsible for nutrient related problems within the lake system and to
          meet relevant stormwater quality treatment codes and policies. Provide a Management Plan for
          approval for any proposed measures.

Response


Refer to attached letter dated 21 April 2016 prepared by Morgan Consulting Engineers, which demonstrate how
nutrients within stormwater runoff will be managed.



6.0 BUSHFIRE

Issue

The submitted “Bushfire Hazard Assessment and Management Plan” (November 2015) uses a number of
differing documents to derive the assessment of the bushfire hazard presented to the structures adjacent
hazardous vegetation. The report uses the bushfire hazard assessment methodology contained in the Noosa
Plan instead of the more contemporary methodology contained in the State Planning Policy of December
2013, Natural Hazards sections. Given the newer mapping and bushfire hazard methodology the assessment
ought to have included the SPP of December 2013 and compared and contrasted the two mapping outcomes
using actual on-site measurements of fuel loads, canopy and understorey height, slopes and areas of
hazardous vegetation round the subject site.



JFP Ref: M2652                                                                                             Page 7