OPW16/0021- Operational Works Application 2 of 4

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6 Water!Quality!Monitoring!

6.1       Construction!
The! management! of! the! site! during! the! construction! phase! is! an! important! step! in!
ensuring! water! quality! standards! are! achieved.! ! Implementation! of! best! practice!
Erosion! and! Sediment! Control! techniques! is! imperative! to! managing! the! quality! of!
runoff!affected!by!construction!works.!!!
The! following! points! provide! general! guidance! on! the! management! of! stormwater!
during!the!construction!phase.!!Detailed!Erosion!and!Sediment!Control!Management!
Plans!should!be!provided!during!the!operation!works!application!stage!in!accordance!
with!Council’s!Maroon!Manual!Z!“Manual!for!Erosion!and!Sediment!Control”.!
      1. Establish!a!single!stabilised!entry/exit!point!for!the!site!works;!!
      2. Construct! a! shakedown! grid! at! the! entrance! to! facilitate! the! removal! of!
         sediment! from! trucks! leaving! the! site.! The! access! road! extending! from! the!
         end!of!existing!road!or!kerb!to!the!grid!should!comprise!a!150Z200!mm!deep!
         pad!of!40!mm!crushed!rock;!!
      3. Install!sediment!fences!along!the!lower!boundaries!of!the!site;!
      4. Install!bins!and/or!windZproof!litter!areas!onZsite!to!minimise!the!dispersion!
         of!gross!pollutants;!!
      5. Maintain! on! site! spare! materials! necessary! for! the! emergency! repair! of! all!
         erosion! control! devices.! This! includes! silt! fences,! clean! crushed! rock! for!
         reapplication! to! the! entrance! road! and! for! replacement! of! rock! within!
         temporary!drainage!channels;!!
      6. Following! each! day’s! construction! works,! ensure! that! any! material! on! road!
         surfaces!is!swept!from!the!road,!and!not!permitted!to!be!washed!down!the!
         gutters!and!piped!drainage!systems.!
      7. Final! establishment! of! any! bioretention! basin! should! not! occur! until! full!
         stabilisation! of! the! upstream! catchment! has! occurred;! preferably! these!
         should! be! temporarily! turfed! during! the! maintenance! period! while! dwelling!
         construction!is!occurring.!
      !
It!shall!be!the!responsibility!of!the!developer,!through!their!principal!contractor,!to!
ensure!that!temporary!sediment!and!erosion!controls!are!installed!and!maintained!
correctly.!!

6.2       Operational!
Water! quality! monitoring! of! the! bioretention! system! is! not! proposed! for! the!
operational! phase.! ! The! “Maintaining! Vegetated! Asset”! guideline! highlights! that!
water! quality! monitoring! is! not! recommended! to! determine! the! performance! of!
every! vegetated! stormwater! asset,! as! it! is! a! specialized! field! that! is! complex! and!
costly.!!In!line!with!this!guideline!the!on!going!monitoring!of!water!quality!from!this!
device!is!not!considered!necessary!considering!the!small!size!of!the!development.!


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