Geotech Report - Acid Sulfate Soil Assessment

 

PARTNERS

In summary, the results of the screening tests are considered to give a reasonably strong indication of possible
ASS presence in Bores 1 and 2, However, it is considered that there was generally no strong indication of ASS
presence (with some exceptions in the upper 1.5m depth) in Bores 3 to 6. As a result of the mixed screening
test results, it was considered that Chromium Suite laboratory analysis should be conducted on selected

samples.

4.4.2

Chromium Suite Analysis

Based on the results of the screening test results, samples were selected for Chromium Suite analysis and were
kept on ice until transported to Australian Laboratory Services Pty Ltd (ALS) under standard chain of custody
protocol. A summary of the test results is given in Table 3.

Depth
(m)

Bore

0.25-0.5
4 | 1.01.25
2.25-25
0.75-1.0
2 | 15-475
2.25-2.5
 0.5-0.75

2.0-2.25
1,75-2.0

 

a ari w

Results in Bold exceed the QASSIT Action Criteria for disturbance of >1000 tonnes of soil (Section 5.1)

125-45 |

 

Table 3: Summary of Laboratory Results

Material

Fil
Silty Clay and Silty Sand
Silty Sand
Fill and Silty Clay
Silty Sand
Silty Sand
Sand
Sand
Sand
Sand

 

pHke

5.6
5.4
5.4
5.4
5.7
5.6

i,

6.5
63
6.5

 

Titratable
Actual
Acidity

hs

<0.02
<0.02
<0.02
0.02
<0.02
<0.02

30.02 |

<0.02
<0.02
<0.02

 

Chromium
Reducible
Sulfur - (Scr)
%S

<0.02
~ <0,02,
<0,02
0.02
<0.02
<0.02
<0.02
<0.02
<0.02
<0.02

Net
Acidity
%S

<0.02

<0.02 |

<0.02
0.04
| <0.02
<0.02
<0.02
<0.02
<0.02
<0.02

 

Liming
Rate*
(kgit)

* Based on the use of good quality fine ag-lime with a neutralising value of 100 % and incorporating a factor of safety of 1.5 to allow for
inconsistencies in mixing during application

 

Residential Development

215-219 David Low Way, Peregian Beach

Project No. 07160

Page 8 of 10

18 June 2007