Attachment 6 - Stormwater Management Plan

R1767: NOOSA LANDFILL: CLEAN WATER DRAIN AND HES BASIN (SW5) – DESIGN REPORT & MAINTENANCE AND INSPECTION PLAN



6                 OPERATION & MAINTENANCE
The SW5 High Efficiency Sediment (HES) basin is to have both dosing and monitoring systems installed.

6.1.                DOSING SYSTEM

The dosing system will read real time flow rates and dose the applicable volume of the Coagulant/Flocculant into the
inflow stream as it passes the dosing point. The data collected is to be sent to a cloud-based data platform for storage
and future interrogation.
Maintenance and operation of the dosing system is to be detailed by the dosing system supplier.

6.2.                MONITORING SYSTEM

The monitoring system will read real time water quality parameters such as:
              •      Turbidity,
              •      pH,
              •      Electrical Conductivity, and
              •      Dissolved Oxygen.
The monitoring system is to also control a power actuated valve on the outlet to the basin. When the water quality
readings are outside the site’s environmental approval conditions the valve will close, stopping any potential outflows
from occurring.
All data collected from the monitoring and shut-off valve is to be sent to a cloud-based data platform for storage and
future interrogation.
Maintenance and operation of the monitoring system is to be detailed by the monitoring system supplier.




Figure 2 – Typical Dosing and Monitoring Setup (Source: Turbid)

6.3.                SEDIMENT BASIN

6.3.1.            FOREBAY
The Forebay will require clean out periodically. Access into the ramp can be gained from the defined access track.
Dewatering into the main cell is recommended if the forebay is to be drained to remove sediment. A sump has been
located in the north western corner of the forebay to assist in desilting. Desilting is recommended to be undertaken once
accumulation is causing large resuspension with inflows. This may be at approximately 50% full.



Environment. Engineering. Education.                                                                              PAGE 7