1-22276-01 site plan

Project No. 1-22276                                                                                                                               Page | 4
March, 2020
Ref: 1-22276, 2020-03-25, ASSMP VER 2
Wessel Petroleum Pty Ltd – Acid Sulfate Soil Investigation and Management Plan - Proposed Service Station Reconstruction, 52-54 Mary Street and
Weyba Road, Noosaville




Waters should only discharged upon acceptable water quality criteria being achieved.

Site Monitoring

A monitoring program should be implemented to provide feedback on the effectiveness of the
management strategy and provide early warning should environmental degradation begin.

The following should be monitored during construction:-

           Groundwater, leachate and discharge directed to holding tanks.
           Neutralised soils (soils post liming).

Stockpiled and Neutralised Soil

Testing and monitoring of stockpiled and neutralised soils should be performed throughout the
construction period. Chromium test methods should be carried out at a rate of at least one
sample per 250m3, with the sampling and testing intensity increasing should results prove to be
variable.

The following performance criteria must be attained for soil that has been treated using
neutralisation:-

      1) The neutralising capacity of the treated soil must exceed the existing plus potential
         acidity of the soil.
      2) Post neutralisation, the soil pH is to be greater than 6.5.
      3) Excess neutralising agent should remain within the soil until all acid generation reactions
         are complete and the soil has no further capacity to generate acidity.
Contingency

During construction, the contractor will have stored on site at all times, at least 500kg of Aglime
to ensure that potentially hazardous situations can be controlled should the need arise.

In addition, for sudden drops in water pH across the site, it is vital that the contractor has
hydrated or slaked lime available for adding to any low pH waters.

Hydrated (slaked) lime, although slightly more expensive than Aglime, is recommended to
neutralise water as it is more soluble. However, a strict pH monitoring program must be carried
out to ensure an acceptable pH range is maintained. Aglime can also be used although it is far
less effective and hence more expensive for this purpose than alternatives such as hydrated
lime.




                                                                                                                  SOIL SURVEYS