07/2023 - Response to Information Request [As Published] · 132007.2023

lime content.

This process will take from one hour to one day per composite sample depending
on the time required for sub-sample extraction. If sampling is biased towards
samples with a high lime content the analysis results will be at odds with the
known volume of lime that was applied.

Use a sampling device to obtain a minimum of 20 and up to 40 approximately
equal volumes of limed soil. The minimum sub-sample size should be in the
range of 100-200 cc in volume. Mix these carefully on a plastic sheet or container
taking care to avoid segregation of the fine and coarse fraction. Quarter down to
retain a 200 gram composite sample.

The location of the sample area/depth is to be recorded.

Perform validation testing at the following rates:
* one test per 500 cubic metres for on-site placement

one test per 250 cubic metres for off-site placement

one test per 125 cubic metres for off-site placement within 50 metres of
a drainage line, stream or other surface water or where the watertable is
within 2 metres of the surface or where the site is below the 50 year flood
line.

*

*

Validation testing should include chemical analysis (SPOCAS or chromium
reducible sulphur test suites) and calcium carbonate.

Itis recommended the sampling and mixing method is carefully documented and
performed according to plan. A proportion of samples will "fail". This is
statistically predictable even though the correct rate of lime has been applied.
Adherence to rigorous sampling and mixing techniques makes it difficult to blame
the sampling stage should a test fail.

Samples are regarded as successfully treated provided they meet the following
criteria:

a) oxidised pH >6.5
b) equivalent sulphur content below 0.03%

In the event of a validation test failure a re-test is required. If the subsequent test
fails then the material must be re-limed to meet the test standard.

b. Scheduling of Validation Sampling

Validation testing of lime treated samples will require time for sampling, sample
transport to a laboratory, sample drying and analysis. This process can easily require
5-7 working days. Where soils are treated and then placed the schedule of placement
should allow sufficient time for the validation process. In the event of samples failing the
validation test it will be necessary to add additional lime and re-test the treated material
again.