Reference Document - OPW23 0189

 Project No. PG-10899                                                                                                         Page | 6
 November 2023
 Ref: PG-10899, 2023-10-16, ASR VER 3
 DD Sunnyside CD Sunnyside Pty Ltd – Acid Sulfate Soil Investigation - Proposed Residence, 30 Mossman Court, Noosa Heads




of the screening tests were used to assist in the selection of samples for more detailed,
quantitative laboratory testing.

Chromium Suite Analysis

Chromium suite analysis was undertaken to quantify existing soil acidity and potential
future acid generation from possible ASS. Soil samples were refrigerated until
transported to Pacific Geotech’s laboratory, under standard chain of custody
protocol. A summary of results is given in Table 2.

TABLE 2                           CHROMIUM SUITE TESTING SUMMARY

                                                               Nett Acidity                                     Liming Rate
 BH No.                Depth (m)
                                                                (mol H+/t)                                     (kg CaCO3/t)
  BH 01                       1.0                                   <5                                               <1
  BH 01                       2.0                                   11                                               <1
  BH 01                       3.0                                   23                                                2
  BH 01                       4.0                                   35                                                3

Summary

On the basis of the testing undertaken, some samples provided nett acidity values
above the QASSIT defined action criteria at depths greater than 3m below ground
level. Therefore, soils disturbed on-site should be treated in accordance with the
attached Acid Sulfate Soil Management Plan.

The results of the laboratory testing are appended to this report.