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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341

342343

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357358359

360 361362

363364365

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471 472

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474475

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481482

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4991500

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16291630

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17111712

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1911

1912

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1914

1915

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20012005

2012

20142020

2022

2033

2035

2038

2039

20402041

2042

2043

2045

2047

2054

2057

2058

3001

3002

3003

3004

3005

3006

30073008

3009

3010

3011

3012

3013

3014

3015

3016

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3019

3020

3021

3022

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3048 3049

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3051

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3060

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3171

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3183

3184

31853186

3187

3188

3189

3190

31913192

3193

3194

3195

3196

3197

3198

4116

41174118

4119

4120

4121

4122

4123

4124

4125

4126

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