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Reference Document - RAL25/0020 & OPW25/0194 (As Published)
237894.00.ASS © 2024 Douglas Partners Pty Ltd Summary of Results - Acid Sulfate Soils Project No: 237894.00 Project Name: Proposed Subdivision Location: 12-14 Gympie Street, Tewantin Sample information Screening test results Laboratory analysis results (acid base accounting) Depth from (m) Reduced level corroborated Depth to (m) Location ID pH change (Y/N or NA) Net acidity (pH units) (pH units) (pH units) (pH units) Reaction Adopted strength texture ANCBT (AHD) pHFOX pHKCl ANC (%S) (%S) (%S) (%S) (%S) (%S) (%S) SNAS TAA pHF SHCl SKCl Scr Sample description Coarse texture: sands to loamy sands and peats 0.03 Assessment criteria (pH units) <4 <3 - 1.0 Action criteria (%S) Medium texture: clayey sand to light clays 0.06a/0.03b Fine texture: light medium to heavy clays 0.1a/0.03b Depth from (m) Reduced level corroborated Depth to (m) Location ID pH change Net Acidity (Y/N or NA) (pH units) (pH units) (pH units) (pH units) Reaction Strength Adopted Texture ANCBT (AHD) pHFOX pHKCl ANC (%S) (%S) (%S) (%S) (%S) (%S) (%S) SNAS TAA pHF SHCl SKCl Scr Sample Description 1 0.00 0.25 2.90 to 2.65 TOPSOIL/Sandy CLAY - dark brown F 6.1 3.3 3 2.8 1 0.25 0.50 2.65 to 2.40 Sandy SILT - grey mottled pale brown F 4.9 4.1 3 0.8 1 0.50 0.75 2.40 to 2.15 Sandy SILT - grey mottled pale brown F 4.7 4.0 2 0.7 1 0.75 1.00 2.15 to 1.90 Sandy SILT-pale brown F 4.7 4.0 2 0.7 1 1.00 1.25 1.90 to 1.65 Silty Sandy CLAY - orange mottled pale brown F 4.6 3.9 2 0.7 4.6 0.060 0.010 0.120 0.130 1 1.25 1.50 1.65 to 1.40 Silty Sandy CLAY - orange mottled grey F 4.6 3.9 2 0.7 1 1.50 1.75 1.40 to 1.15 Silty Sandy CLAY - orange mottled grey F 4.6 3.8 2 0.8 1 1.75 2.00 1.15 to 0.90 Silty Sandy CLAY - red-orange F 4.6 3.8 2 0.8 2 0.00 0.25 2.60 to 2.35 TOPSOIL/Sandy CLAY - dark brown F 5.5 3.6 3 1.9 2 0.25 0.50 2.35 to 2.10 Silty Sandy CLAY - dark brown F 5.1 3.8 3 1.3 4.8 0.010 0.012 0.150 0.170 2 0.50 0.75 2.10 to 1.85 Silty Sandy CLAY - pale brown F 4.9 4.0 2 0.9 2 0.75 1.00 1.85 to 1.60 Silty Sandy CLAY - pale brown F 4.8 4.0 2 0.8 2 1.00 1.25 1.60 to 1.35 Silty Sandy CLAY - orange mottled grey F 4.7 3.8 3 0.9 4.4 0.060 0.080 <0.005 0.170 0.033 0.200 2 1.25 1.50 1.35 to 1.10 Silty Sandy CLAY - red-orange F 4.8 3.9 2 0.9 2 1.50 1.75 1.10 to 0.85 Silty Sandy CLAY - red-orange F 4.8 3.9 3 0.9 2 1.75 2.00 0.85 to 0.60 Silty CLAY - pale grey mottled pale brown-red F 5.1 4.0 2 1.1 3 0.00 0.25 3.80 to 3.55 TOPSOIL/Sandy CLAY - dark brown F 6.5 4.4 4 2.1 3 0.25 0.50 3.55 to 3.30 FILL/Sandy GRAVEL C 7.2 4.7 4 2.5 3 0.50 0.75 3.30 to 3.05 Sandy SILT - grey mottled pale brown F 6.2 3.7 3 2.5 5.2 0.010 <0.005 0.020 0.020 3 0.75 1.00 3.05 to 2.80 Sandy SILT - pale brown F 5.4 4.3 2 1.1 3 1.00 1.25 2.80 to 2.55 Sandy SILT - pale brown F 5.3 4.2 2 1.1 3 1.25 1.50 2.55 to 2.30 Silty Sandy CLAY - orange mottled pale brown F 4.8 3.9 2 0.9 3 1.50 1.75 2.30 to 2.05 Silty Sandy CLAY - red-orange F 4.8 3.9 2 0.9 3 1.75 2.00 2.05 to 1.80 Silty CLAY - pale grey mottled pale brown-red F 5.0 4.0 2 1.0 6 0.00 0.25 4.20 to 3.95 TOPSOIL/Sandy CLAY - dark brown F 7.0 4.8 4 2.2 6 0.25 0.50 3.95 to 3.70 FILL/Sandy GRAVEL C 7.0 5.9 3 1.1 6 0.50 0.75 3.70 to 3.45 Silty Sandy CLAY - orange mottled pale brown F 5.4 4.7 3 0.7 6 0.75 1.00 3.45 to 3.20 Silty Sandy CLAY - orange mottled pale brown F 5.1 4.1 3 1.0 4.7 0.030 <0.005 0.070 0.070 6 1.00 1.25 3.20 to 2.95 Silty Sandy CLAY - orange mottled pale brown F 4.8 4.3 3 0.5 6 1.25 1.50 2.95 to 2.70 Silty CLAY - pale grey mottled pale brown-red F 4.6 3.8 2 0.8 4.2 0.050 0.070 <0.005 0.280 0.043 0.320 6 1.50 1.75 2.70 to 2.45 Silty CLAY - pale grey mottled pale brown-red F 4.7 3.8 2 0.9 6 1.75 2.00 2.45 to 2.20 Silty CLAY - pale grey mottled pale brown-red F 4.7 3.8 2 0.9 Notes: Adopted texture - C = coarse, M = medium, F = fine pHF - Soil pH in water pHFOX - Soil pH in peroxide Reaction strength: 1.0; No reaction to slight. 2.0; Moderate reaction. 3.0; Strong reaction with persistent froth. 4.0; Extreme reaction. pH change = pHF - pHFOX pHKCL - KCl extractable pH SKCl - KCl extractable sulfur SHCl - HCl extractable sulfur Scr - potential sulfidic acidity TAA - titratable actual acidity (reported if pHKCL<6.5) SNAS – retained acidity (reported if pHkCl < 4.5) ANCBT – acid neutralising capacity (reported if pHKCl ≥ 6.5) NT - Not tested Blue depths indicate where samples have been collected at or below the groundwater table Bold results are indicators of ASS conditions, noting:
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