Geotech Report - Acid Sulfate Soil Assessment - Appendix A

 

Residential Development

215-219 David Low Way, Peregian Beach

Draft Acid Sulfate Soil Management Plan (ASSMP)

 

 

 

 

 

 

 

 

 

 

 

Element Acid Sulfate Soil Management Plan
Tasks/Actions (cont'd) criteria for a tidal estuary.
ASS Treatment Off-Site
Where soils are required to be treated off-site, treatment of the soils will be undertaken
either:
in accordance with the provisions of this ASSMP for on-site treatment, modified as
necessary for use at an accessible alternative off-site treatment area; or
e in accordance with the ASSMP for the designated off-site treatment area.
Performance Indicators Retained Water
Laboratory testing of the water encountered during basement excavation will be carried
out for pH, dissolved oxygen and turbidity. These parameters will be assessed against
the equivalent water quality objective criteria for a tidal estuary as follows:
pH 6.5-8.5
Disturbed Oxygen 80-100% saturation
Turbidity 20NTU
Treated Soil
Chromium suite testing carried out for validation of applied liming rates will be deemed to
be acceptable if the net acidity level recorded is <0.02%S.
Frequency/Timing Retained Water
Water quality within basement excavations will be monitored regularly during soil
removal and particularly following substantial rainfall events.
Treated ASS
The sampling and testing of any lime treated soils will be subject to validation testing at a
rate of one test per 400m: of treated soil, which will be repeated until satisfactory results
are obtained.
Contingency Plan If lime treatment of soils is unsuccessful whereby performance targets are not being met
as indicated by the validation testing and water quality testing procedures then:
© the soil removal schedule will be reassessed. and action taken to determine the
problems causing the unsuccessful performance;
© if the problems are related to ineffective implementation of the ASSMP, then the
plan will be audited by a person nominated by the project manager to ensure
improved implementation (monitoring and testing will be increased to ensure
compliance with the established standards); and
e any significant changes to the ASSMP will be subject to discussions with the
relevant regulatory authorities.
Responsibility The satisfactory implementation of the ASSMP by the contractor will be the
responsibility of the project manager, who will ensure:
e the contractor is made aware of site specific conditions and implications for the
management of sediments within the site;
e the contractor complies with the elements of the ASSMP and erosion control
measures proposed;
e correct methods for the collection of samples and testing are employed and that the
results are reported to the relevant site authorities; and
Responsibility (cont'd) e corrective action mnibasUiee proposed by the contractor are approved.
The contractor's responsibilities will include:
e awareness of site conditions and requirements for the implementation of the
ASSMP;
Residential Development Appendix C
215-219 David Low Way, Peregian Beach Page 2 of 3

Project No. 07160

18 June 2007