07/1586 - Response to Information Request [As Published] · 132007.1586

* Project No. 307-2624
August, 2007

Page 4

 

_5.2 Quantitative Tests

The second stage of laboratory testing was carried out by SWL on 4 No. samples, which

were selected on the basis of the screening tests showing the possible presence of acid

sulphate soil, i.e. those showing low pH and large change between the pHr and the

PHrox readings. This second stage testing consisted of Chromium Reducible Sulfur
(SCr) tests, and Total Actual Acid (TAA) tests. The SCr test provides data on sulfuric
acids, without influence from organic acids, and is generally indicated for low acidic

sandy soils and/or soils with some organic material.

Full results of the testing are summarised below in Table 1, and the SWL test report

sheets are included in Appendix B

 

 

 

 

 

TABLE 1 QUANTITATIVE TEST RESULTS SUMMARY
Borehole ID Sample Depth Description Sa TAA
(m) (%S) (mol H+/t)

BH1 2.0 - 2.25 Silty Sand 0.01 4
(light grey)

BH2 1.0- 1.25 Silty Sand 0.00 2
(light grey)

BH2 1.75 -2.0 Silty Sand 0.02 13
(dark grey)

BH2 2.75 - 3.0 " 0.07 42

 

 

 

 

 

 

 

 

ZZ SOIL SURVEYS ENGINEERING