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6915000mN
6935000mN
20
25
30
6915000mN
6935000mN
20
25
30
520000mE 535000mE25 30
520000mE 535000mE25 30
27 54
27 48
27 42
153 12 153 18 153 24
153 12 153 18 153 24
27 54
27 48
27 42
CITY OF GOLD COAST
LOGAN CITY
REDLAND SHIRE
C The State of Queensland (Department of Natural Resources and Mines) 2002.
ISLANDS NOT SURVEYED
Logan
River
PimpamaRiver
Coomera
Riv
er
ACID SULFATE SOILSLOGAN - COOMERA AREA
Ref. No. NR&M-SEA-I-A0 3329
PAC
IFIC
HIG
HW
AY
MORETON BAY
Hotham
Creek
ACID SULFATE SOILSLOGAN - COOMERA AREA
0 - 0.5m
0.5 - 1m
1 - 2m
2 - 3m
3 - 4m
4 - 5m
>5m
0
1
2
3
4
5
5+
A0
A1
A2
A3
A4
A5
A5+
S0
S1
S2
S3
S4
S5
S5+
REFERENCE
Depth DepthCode
Depth to ActualAcid Sulfate Soil2
(pH ≤4.0)
Depth to PotentialAcid Sulfate Soil3
ACID SULFATE SOILS (ASS)1 ON RELATIVELY UNDISTURBED LAND
Depth to StronglyAcidic Soil layer2
(pH >4.0 to ≤5.0)
a0
a1
a2
a3
a4
a5
a5+
0 500500 1000 1500 2000metres metres
SCALE 1 : 25 000
Projection: Universal Transverse Mercator (MGA Zone 56)
Horizontal Datum: GEOCENTRIC DATUM OF AUSTRALIA (GDA94)
Note: This map is GDA94 compliant
S
SLA
SDL
LP
NA
LP5
A0S2
a1S2
S1/S2
SLAW
S2W
A1W
The depth codes above imply that a predominance of profiles in the map unit fall within the nominated depth range.
Actual acid sulfate soil layers (designated with an A code) often overlie potential acid sulfate soil layers (designated with an S code). Where this occurs e.g. the map unit is coloured according to the depth of the upper surface of the 'actual' layer (A0) and overlayed with yellow dots. An 'a' preceding the soil depth code e.g. indicates a strong acid soil layer with field pH ranging from >4.0 to ≤5.0. This may or may not be a result of sulfide oxidation. While 'a' depth code is shown on the map, no colour is assigned to it.
In areas where there is varying depth to an ASS layer that cannot be separately mapped at the operative scale, two colours are used to designate the dominant depths. This appears as equal width striped colours. e.g.
SP - indicates sediments of Pleistocene age1, so that SP5+ indicates sulfidic sediments (of Pleistocene age) deeper than 5m .
w - Subscript w indicates areas associated with Melaleuca sp. wetlands and occasionally Casuarina glauca communities. Oxidisable sulfur % in surface layers may be highly variable and often exceeds the 'Action Criteria4'. This may include sulfur from organic compounds and modern accretion of sulfides in a wet, organic rich environment. ASS typically occurs at depth. Where this occurs e.g. or or the map is coloured as per the actual or potential depth category and is overlayed with pattern.
Land mapped at 1:100 000 scale where ASS occurs within 5m of the surface.
Limited field assessment but occurs in a landscape position where there is a reasonable probability of ASS occurrence. This is usually land where the present use precludes any disturbance eg. National Parks, Reserves etc., or land where accessibility is severely restricted.
ACID SULFATE ON DISTURBED LAND5
Disturbed land, eg. Canal estate, Marina, Aquaculture, Quarry, Urban, Industrial likely to contain ASS. (In some cases partial or full treatment may have been undertaken). Limited field investigation.
5m AHD6 CONTOUR - NORMAL LIMIT OF FIELD INVESTIGATION
The 5m contour line delineates the normal limit of field investigation of Holocene, estuarine sulfidic sediments7 which form ASS. Holocene ASS has not been found in this study on land above 5m elevation. In some cases, the limit of Holocene ASS8 is at the 5m contour. In other cases, the limit is <5m AHD. In the latter case, the land between the ASS limit and the 5m contour is designated LP explained below.
LAND WITH A LOW PROBABILITY OF ACID SULFATE SOIL OCCURRENCE
Land between the 5m AHD contour and the outer limit8 of Holocene, estuarine ASS (ie land <5m AHD) as mapped at this scale, with low probability of ASS occurrence9. Limited field investigation.
Land >5m AHD with low or negligible probability of ASS occurrence9. Limited field assessment.
LAND NOT ASSESSED
Land not assessed for ASS as part of this survey. It may include non ASS land beyond the boundary established as the limit of Holocene, estuarine, sulfidic sediments8 but insufficient or no field testing was carried out9.
Acid sulfate soil is the generic term used to define soils derived from estuarine sediments containing iron sulfides (pyrite) or containing the acidic products of the oxidation of sulfides. The term includes actual and potential acid sulfate soils. Unless used with the superscript P, the code 'S' implies sulfidic sediments of Holocene age. The superscript P implies sediments of Pleistocene age7.
An "A" preceding the soil depth code indicates the probable depth to a soil layer or horizon where a field pH of ≤4.0 is first encountered. A field pH of 4.0 or less is used as an indicator of an Actual Acid Sulfate Soil (AASS) which has mobile acidity in the form of ionic hydrogen, aluminium, iron or acid salts. Extensive areas with high actual acidity derived from sulfide oxidation may constitute a significant environmental hazard. Some soils with high organic matter may have low pH from organic acids. An 'a' preceding the depth code indicates the probable depth to a soil layer or horizon with field pH ranging from >4.0 to ≤5.0. This may or may not be a result of ASS oxidation.
An "S" preceding the soil depth code indicates the probable depth to a Potential Acid Sulfate Soil (PASS) layer or horizon. PASS are soils where the oxidisable sulfur percentage exceeds the prescribed 'action criteria4' at which treatment is required if disturbed. Testing for Oxidisable sulfur is conducted by the Total Oxidisable Sulfur (TOS) method, the Chromium Reducible Sulfur (SCR) method or the Peroxide Oxidisation - Combined Acidity and Sulfate (POCAS) method.
Oxidisable sulfur 'Action Criteria' that trigger treatment are currently: Sands, 0.03 S%; Loams to light clays, 0.06 S%; Medium to heavy clays, 0.1 S%. NOTE: For disturbance > 1000 tonnes the action criteria is 0.03% regardless of soil texture.
Limited or no field checking has been carried out in disturbed lands.
The reliability of elevation data is variable across the study area. AHD refers to Australian Height Datum.
The primary focus of ASS investigation in this study are the sulfidic sediments that were deposited in the Holocene epoch, that is, during the last 10 000 years. Experience in coastal stratigraphic mapping shows that similar, but much older sulfidic sediments of Pleistocene age can occur, still in a reduced (anaerobic) state, being buried under either cemented sands or old, consolidated alluvium. They are far less common than the Holocene equivalents, and have been found beneath land whose surface is both above and below 5m AHD. Generally, Pleistocene sediments will be found at greater depths below the surface than equivalent Holocene sediments.
The outer boundary of Holocene estuarine ASS commonly occurs at the intersection with hard rock or other materials of non estuarine origin. It is either at the 5m contour or at lower elevation. This boundary is established using limited field checking at the boundary itself, together with the use of contour lines and geological map boundaries. There is no field assessment beyond the 5m AHD contour level. It should be noted, however, that certain lithologies on land above 5m AHD may contain sulfidic material of non estuarine/Holocene origin. Additionally, much older, estuarine, sulfidic sediments may occur at depth on land >5m AHD, as discussed in footnote 7 above.
CAUTION: It is not possible to accurately map the distribution of ASS adjacent to rivers and streams at the current mapping scale eg mangrove fringes. ASS may also be buried below alluvium of past and present stream channels some distance upstream of mapped areas.
NOTE: This map should be used in conjunction with the accompanying report covering this area.
Borehole locations where profiles were described in detail and samples taken for analysis
Local Authority boundary
Digital Cadastral Database
NOTE:
1
2
3
4
5
6
7
8
ACCURACY STATEMENT:Due to varying sources of data sets, spatial locations may not coincide when overlaid.
Produced at the Indooroopilly Sciences Centre by Natural Resource Information Management, Natural Resource Sciences, Department of Natural Resources and Mines.
DISCLAIMER:While every care is taken to ensure the accuracy of this product, the Department of Natural Resources and Mines makes no representations or warranties about its accuracy, reliability, completeness or suitability for any particular purpose and disclaims all responsibility and all liability (including without limitation, liability in negligence) for all expenses, losses, damages (including indirect or consequential damage) and costs which you might incur as a result of the product being inaccurate or incomplete in any way for any reason.
CARTOGRAPHY by J K Myers, Natural Resource Information Management, Department of Natural Resources and Mines, Indooroopilly Sciences Centre, Brisbane.
PROJECT MANAGEMENTC R Ahern, QASSIT, Natural Resource Sciences, Department of Natural Resources and Mines, Indooroopilly Sciences Centre, Brisbane.
SURVEY by J A Manders, C D Smith, J Adams, K M Watling, E V Barry, J M Anorov, QASSIT, Natural Resource Sciences, Department of Natural Resources and Mines, Indooroopilly Sciences Centre, Brisbane.
LABORATORY ANALYSIS by Natural Resource Sciences Laboratories, Department of Natural Resources and Mines, Indooroopilly Sciences Centre, Brisbane.
NORTHEASTALBERT
LANDCARE
256
Wor
kspa
ce S
TAR
SH
IP: C
data
3/jo
bs/jo
b172
74
Information current to August 2003 (Version 3)
Information current to August 2003 (STARSHIP: cdata3/jobs/job16117/sea/sea5m94_v3)
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2012
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4116
41174118
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SDL
a0S2
a2S3
SDL
S
LP5
SW
LP5A2S4
a0LP
SW
A0S3
LP5
LP5S3
LP5
a0S1
SDL
LP5
A1
LP5
LP5
S
A0S1
LP5
S2
A0S2
A0S1
SDL
a0S2
A0
a0S1
S3
Sa0S3
A0 A0S0
a0S2
LP
LP5
a0LP
A0S3
LP5
S3
a0S2S
a0S3
A0
S a0LP
LP5
S
SDL
SWA0S0W
a0S2a0S3SDL
a0S2
A1S3
S5
a0S1
A0S1
a0LP
A0
SDL
S3
a0LP LP5
a1S5+
SDLa0S3
a0S2
A0S3
a0LP
A1S2W A0S0Wa0LP
a0LP
SWa0S1
SDL
A0S3
A0S0
A0S0
A1
A0S2
SLAW
a0S2
a0LP
S1A0S3 A0S3
S0W
a0LP
A2
A1 A0S2
A0S2
a0LP SDL
a0S1
S0W
a0LP
A0S1 A0S1WA1S2
A1
SLAW
A0S2
a0S2
S1W
SP5+S2
a0S4
A2
SLA
S2
A1S1
A0S0W
A0
A0S1
a0LP
a0S2LP5
A1S1
A0S2
S2
a0S3
SDL
S1W
a4S3
LPA0S2 LP5
LP5
LP5
SW
LP5
LPLP
LP
LP
a0LP
LP
LP
SDL
SW
LP5
S0W
SDL
a0LP
LP5
a0S2
SDL
LP
LP
SLA
LP
LP5
a0S2
SLA
LP
LP
LP SDL
SLA
SLA
SDL
SDLSDL
SDL
NA
NA
SLA
a0S0w
a1S0w
A0S1W
A0S2
S
a0S2
A0S1
A0S2
A0S2
A0S2A0
a0LP
a0LP
a0LP
a0S2
a0S1
A0S1W
A0S0
a0LP
a0LP
S0W
SW
SW
LP
SW
SW
SLA
LP5
S0W
Beenleigh
Woongoolba
Wolffdene
Jacobs Well
Ormeau
Woogoompah Island
Pimpama
Sanctuary Cove
Santa Barbara
Hope Island
Coomera
Boykambil
Paradise Point
Oxenford
Helensvale
INTENSITY DIAGRAM
1:50 000 scale - Generally 2 to 7 boreholes per km2
1:100 000 scale - Broad scale mapping, generally one borehole per km2
1:25 000 scale - Generally 8 to 16 boreholes per km2
Mapping Units interpreted from geomorphology, elevation and aerial photography;
limited or no field investigation conducted
LOCALITY MAP
BRISBANE
Noosa Heads
Coolangatta
SOUTH
PACIFIC
OCEAN
NSWQLD
QLD
STUDY AREA