MCU10/2083 Development Application part 2 - Attachment 7 - Stormwater Management Plan






4.0 CONSTRUCTIONPHASEWATERQUALITYMANAGEMENT

4.1      POLLUTANTS

Typicalpollutantsgeneratedduringtheconstructionphaseofthedevelopmentareshownbelow(GoldCoastCity
Council,2005).

                                     Table7ConstructionPhasePollutants
                 Pollutant                PotentialSource                                       Priority
                                           Paper, construction packaging, food packaging,
                 Litter                                                                           High
                                           cementbags,offcuts
                                           Unprotected exposed soils and stockpiles during
                 Sediment                                                                         High
                                           earthworksandbuildingworks
                                           Fuel and Oil spills, leaks from construction
                 Hydrocarbons                                                                     High
                                           equipmentandtemporarycarparkareas
                                           CementSlurry,asphaltprimer,solvents,cleaning
                 ToxicMaterials                                                                  Medium
                                           agents,washwaters(eg.fromtileworks)
                 Alkalinesubstances     Cementslurryandwashwaters                           High



4.2      POTENTIALIMPACTS

The addition of coarse / fine sediments and other pollutants to stormwater runoff from the development sites
may increase nutrient loads of receiving water, potentially resulting in eutrophication. Impacts on the
surroundingenvironmentwillbeminimisedduringtheconstructionphasewithmeasuresasoutlinedinthisSite
BasedStormwaterManagementPlanandErosionandSedimentControlPlanstobeprovidedattheoperational
worksstage.


4.3      PERFORMANCEOBJECTIVESANDINDICATORS

Theamountofrunoffcrossingandleavingthesiteshouldbekepttoaminimumduringtheconstructionphase.
Thiswillrestrictsoilerosionandmobilisationofsedimentsandpollutantsthroughandoffthesite.

Stormwaterrunoffatdischargepointsduringtheconstructionphaseshallconformtotheperformancecriteriaas
tabulatedbelow(GoldCoastCityCouncil,2005).
                                  




    SITEBASEDSTORMWATERMANAGEMENTPLAN–RevisionD     37GibsonRoad,Noosaville                                 Page 8



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4.1 POLLUTANTS

 

Typical pollutants generated during the construction phase of the development are shown below (Gold Coast City
Council, 2005).

Table 7 - Construction Phase Pollutants

 

Pollutant Potential Source Priority

 

. Paper, construction packaging, food packaging, |
Litter High
cement bags, off-cuts

 

. Unprotected exposed soils and stockpiles during .
Sediment a High
earthworks and building works

 

Fuel and Oil spills, leaks from construction .
Hydrocarbons . High
equipment and temporary carpark areas

 

. | Cement Slurry, asphalt primer, solvents, cleaning .
Toxic Materials Medium

agents, washwaters (eg. from tile works)

 

Alkaline substances | Cement slurry and washwaters High

 

 

 

 

 

4.2 POTENTIAL IMPACTS

 

The addition of coarse / fine sediments and other pollutants to stormwater runoff from the development sites
may increase nutrient loads of receiving water, potentially resulting in eutrophication. Impacts on the
surrounding environment will be minimised during the construction phase with measures as outlined in this Site
Based Stormwater Management Plan and Erosion and Sediment Control Plans to be provided at the operational
works stage.

4.3. PERFORMANCE OBJECTIVES AND INDICATORS

 

The amount of runoff crossing and leaving the site should be kept to a minimum during the construction phase.
This will restrict soil erosion and mobilisation of sediments and pollutants through and off the site.

Stormwater runoff at discharge points during the construction phase shall conform to the performance criteria as
tabulated below (Gold Coast City Council, 2005).

 

SITE BASED STORMWATER MANAGEMENT PLAN — Revision D 37 Gibson Road, Noosaville 8