70 55 000m N 70 70 000m N 60 65 70 55 000m N 70 70 000m N 60 65 4 95 000m E 5 10 000m E 00 05 4 95 000m E 5 10 000m E 00 05 26 36 26 30 153 00 153 06 153 00 153 06 26 36 26 30 Bli Bli Coolum Beach Doonan Eumundi Maroochy River Mudjimba Nambour North Arm Peregian Beach Point Arkwright Yandina Yaroomba Marcoola Weyba Downs Verrierdale Peregian Beach South Yandina Creek Valdora Ninderry Kulangoor Mount Coolum Parklands Rosemount Pacific Paradise LP S LAW S1 LP S LA LP S LP5 S LA a0S3 S DL a0S P 4 a0S2 LP LP5 S LAW a0S P 5 S DL S P 5 LP5 LP LP S DL a0S P 4 a0S2 a0S2 A0S1 S LA S LA a0LP A0S0 A1S2 A0S1 S2 A0S1 A1S3 A1S2 S DL S2 S2 A0S0 a0S2 A0S2 a0S4 a0S1 A2S2 a0S4 LP5 S4 S3 S2 LP A0S0 a0S4 A0S1 S3 S S3 LP LP5 S S DL a0S2 S1 S0 A0S2 S3 S1 W a0S2 a0LP a0S1 a0LP a0S2 a0S2 LP LP S DL a0LP a0S2 A2S3 a0LP A2S2 S P 5+ A0S2 A1S1 a0LP S LAW S2 W LP S LA S P 5+ A0S0 A0S2 LP5 A2S2 a0S2 S LA LP a0S P 5 S1 a0S1 S3 LP a0LP S3 LP S2 S3 S2 S S DL a0S2 S1 S DL a0S3 LP5 S2 S1 S LAW S0 587 588 594 595 598 599 600 601 602 603 604 605 606 607 609 610 611 612 613 614 615 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 646 647 648 649 650 657 694 695 696 697 698 699 700 701 702 703 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 901 902 920 921 976 977 978 980 981 982 983 984 985 986 987 988 989 990 991 992 993 994 995 996 997 998 999 2150 2151 2152 2153 2154 2155 2156 2157 2158 2159 2160 2161 2162 2163 2164 2165 2166 2167 2168 2169 2170 2171 2172 2173 2176 2177 2178 2179 2180 2181 2182 2183 2184 2185 2186 2187 2188 2189 2190 2191 2192 2196 2197 2198 2199 2200 2201 2202 2214 2225 2226 2227 2228 2229 2230 2231 2232 2233 2234 2235 2236 2237 2238 2239 2240 2241 2245 2246 2247 2248 2249 2250 2251 2260 2261 2280 2281 2311 2312 2313 2314 2315 2316 2317 2318 2319 2333 2334 2335 2336 2337 2338 2339 2340 2341 2342 2343 2344 2345 2346 2347 2348 2349 2350 2351 2352 2353 2354 2355 2356 2357 2358 2359 2360 2361 2362 2363 2364 2365 2366 2367 2368 2369 2370 2371 2372 2373 2374 2375 2376 2377 2378 2379 2380 2383 2384 2385 2386 2387 2388 2389 2390 2391 2400 2401 2402 2403 2404 2405 2406 2407 2408 2409 2410 2411 2412 2413 2414 2415 2416 2417 2418 2419 2420 2421 2422 2423 2424 2425 2426 2427 2438 2439 2440 2441 2442 2443 2444 2445 2446 2448 2449 2450 2451 2452 2453 2454 2455 2456 2457 2458 2459 2460 2461 2462 2463 2464 2465 2466 2467 2468 2469 2470 2471 3108 3109 3110 3111 3112 3113 3114 3115 3116 3117 3118 3119 3120 3121 3122 3123 3124 3125 3126 3127 3128 3129 3130 3131 3132 3133 3134 3135 3136 3137 3138 3139 3140 3141 3142 3143 3144 3145 3146 3147 3148 3149 3150 3151 3152 3153 3154 3155 3156 3157 3158 3159 3160 3161 3162 3163 3164 3165 3166 3167 3168 3169 3170 3224 3225 3226 3227 3228 3229 3230 3231 3233 3234 3235 3236 3237 3238 3239 3240 3241 S S LA S DL LP NA LP5 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+ NOTE: REFERENCE Depth Depth Code Depth to Actual Acid Sulfate Soil 2 (pH ≤4.0) Depth to Potential Acid Sulfate Soil 3 ACID SULFATE SOILS (ASS) 1 ON RELATIVELY UNDISTURBED LAND MAROOCHY CALOUNDRA ACID SULFATE - SUSTAINABLE LAND MANAGEMENT PROJECT ACID SULFATE SOILS MAP 1 Depth to Strongly Acidic Soil layer 2 (pH >4.0 to ≤5.0) a0 a1 a2 a3 a4 a5 a5+ 0 500 500 1000 1500 2000 metres 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 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. C The State of Queensland (Department of Natural Resources and Mines) 2002. PROJECT MANAGEMENT C R Ahern, QASSIT, Natural Resource Sciences, Department of Natural Resources and Mines, Indooroopilly Sciences Centre, Brisbane. SURVEY by D Malcolm, J Adams, E Barry and I Hall, 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. ACID SULFATE SOILS MAROOCHY CALOUNDRA ACID SULFATE SUSTAINABLE LAND MANAGEMENT PROJECT MAP 1 Ref. No. NR&M-SEA-I-A0 3330 980 A0S2 a1S2 S1/S2 S LAW S2 W A1 W 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. S P - indicates sediments of Pleistocene age 1 , so that S P 5+ indicates pyritic 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 Criteria 4 '. 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 LAND 5 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 AHD 6 CONTOUR - NORMAL LIMIT OF FIELD INVESTIGATION The 5m contour line delineates the normal limit of field investigation of Holocene, estuarine pyritic sediments 7 which form ASS. Holocene ASS has not been found in this study on land above 5m elevation. In some cases, the limit of Holocene ASS 8 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 limit 8 of Holocene, estuarine ASS (ie. land <5m AHD) as mapped at this scale, with low probability of ASS occurrence. Limited field investigation. Land >5m AHD with low or negligible probability of ASS occurrence. 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, pyrite sediments 8 but insufficient or no field testing was carried out. 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 pyritic sediments of Holocene age. The superscript P implies sediments of Pleistocene age 7 . 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 of pyritic origin exceeds the prescribed 'action criteria 4 ' at which treatment is required if disturbed. Testing for Oxidisable sulfur is conducted by the Total Oxidisable Sulfur (TOS) method, the Chromium Reducible Sulfur (S CR ) 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 pyritic 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 pyritic 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, pyritic sediments may occur at depth on land >5m AHD, as discussed in footnote 7 above. 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 Data Base 1 2 3 4 5 6 7 8 Information current to September 2002 - Workspace STARSHIP: Cdata3/jobs/job17754 MAROOCHY SHIRE Lake Weyba NOOSA SHIRE South Pacific Ocean Maroochy River See adjoining map A0 3331 LOCALITY MAP BRISBANE Noosa Heads Coolangatta SOUTH PACIFIC OCEAN NSW QLD QLD STUDY AREA INTENSITY DIAGRAM Point Arkwright Peregian Beach Alexandra Headland 1:50 000 - Approximately one borehole per 25ha, 2 to 7 holes per km 2 1:100 000 - Broad scale mapping, minimum of one hole per km 2 1:25 000 - Approximately one borehole per 6.25ha, 8 to 16 holes per km 2 Mt Coolum to Peregian Beach South Lake Weyba Yandina to Dunethin Rock Pacific Paradise to Mt Coolum
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7055000mN
7070000mN
60
65
7055000mN
7070000mN
60
65
495000mE 510000mE00 05
495000mE 510000mE00 05
26 36
26 30
153 00 153 06
153 00 153 06
26 36
26 30
Bli Bli
Coolum Beach
Doonan
Eumundi
Maroochy River
Mudjimba
Nambour
North Arm
Peregian Beach
Point Arkwright
Yandina
Yaroomba
Marcoola
Weyba Downs
Verrierdale
Peregian Beach South
Yandina Creek
Valdora
Ninderry
Kulangoor
Mount Coolum
Parklands
Rosemount
Pacific Paradise
LP
SLAW
S1
LP
SLA
LP
S
LP5
SLA
a0S3
SDL
a0SP4
a0S2
LP
LP5
SLAW
a0SP5
SDL
SP5
LP5
LP
LP
SDL
a0SP4
a0S2
a0S2A0S1
SLA
SLA
a0LP
A0S0
A1S2
A0S1
S2
A0S1
A1S3A1S2
SDL
S2
S2
A0S0
a0S2
A0S2
a0S4
a0S1
A2S2
a0S4
LP5 S4
S3
S2
LP
A0S0
a0S4
A0S1
S3
S
S3
LP
LP5
SSDL
a0S2
S1
S0
A0S2
S3
S1W
a0S2 a0LPa0S1
a0LP
a0S2
a0S2LPLP
SDL
a0LP
a0S2
A2S3
a0LPA2S2 SP5+
A0S2
A1S1
a0LP
SLAW
S2WLP
SLASP5+
A0S0
A0S2 LP5
A2S2
a0S2
SLA
LP
a0SP5
S1a0S1
S3
LP a0LP
S3
LP
S2
S3
S2
S
SDL
a0S2
S1
SDL
a0S3
LP5
S2S1
SLAWS0587
588594
595
598
599
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601602
603
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615623
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835
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2150
2151
2152
2153
2154
2155
2156
21572158
21592160
2161
2162
2163
2164
2165
2166
2167
2168
2169
2170
2171
2172
2173
2176
21772178
2179
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2184
2185
2186
2187
2188
2189
2190
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2192
2196
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2200
2201
2202
2214
22252226
2227 2228
2229
22302231
22322233
2234
22352236
2237
2238
2239
22402241
2245
22462247
2248
2249
2250
2251
2260
2261
2280
2281
2311
23122313
2314
2315
2316
2317
23182319
2333
2334
2335
23362337 2338
2339
2340
23412342
2343
2344
2345
2346
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2348
2349
2350
2351
23522353
2354 2355
2356
2357
23582359
2360
23612362
23632364 2365
2366
2367
2368
2369
23702371
2372
2373
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23792380
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2391
2400
2401
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2407
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2412
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2415
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2423
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2425
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2427
243824392440 2441
24422443
2444
2445
2446
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2451
2452
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2454
24552456
2457
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2462
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2466
2467
24682469
2470
2471
3108
3109
3110
3111
3112
3113
3114
3115
3116
3117
3118
3119
3120
3121
3122
3123
3124
3125
3126
3127
3128
3129
31303131
3132
3133
3134
3135
31363137
3138
3139
3140
3141
3142
3143
3144
3145
3146
3147
3148
3149
3150
3151
3152
3153
3154
3155
3156
3157
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3163
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3165
3166
3167
3168
3169
3170
3224
3225
3226
3227
3228
3229
3230
3231
3233
3234
3235
32363237 3238
3239
3240
3241
S
SLA
SDL
LP
NA
LP5
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+
NOTE:
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
MAROOCHY CALOUNDRA ACID SULFATE -SUSTAINABLE LAND MANAGEMENT PROJECT
ACID SULFATE SOILS
MAP 1
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
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.
C The State of Queensland (Department of Natural Resources and Mines) 2002.
PROJECT MANAGEMENTC R Ahern, QASSIT, Natural Resource Sciences, Department of Natural Resources and Mines, Indooroopilly Sciences Centre, Brisbane.
SURVEY by D Malcolm, J Adams, E Barry and I Hall, 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.
ACID SULFATE SOILSMAROOCHY CALOUNDRA ACID SULFATE
SUSTAINABLE LAND MANAGEMENT PROJECT
MAP 1Ref. No. NR&M-SEA-I-A0 3330
980
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 pyritic 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 pyritic 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 occurrence. Limited field investigation.
Land >5m AHD with low or negligible probability of ASS occurrence. 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, pyrite sediments8 but insufficient or no field testing was carried out.
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 pyritic 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 of pyritic origin 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 pyritic 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 pyritic 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, pyritic sediments may occur at depth on land >5m AHD, as discussed in footnote 7 above.
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 Data Base
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4
5
6
7
8
Info
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curr
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Wor
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54
MAROOCHY SHIRE
Lake Weyba NOOSA SHIRE
South
Pacific
Ocean
Maroochy
River
See adjoining map A0 3331
LOCALITY MAP
BRISBANE
Noosa Heads
Coolangatta
SOUTH
PACIFIC
OCEAN
NSWQLD
QLD
STUDY AREA
INTENSITY DIAGRAM
Point Arkwright
Peregian Beach
Alexandra Headland
1:50 000 - Approximately one borehole per 25ha, 2 to 7 holes per km2
1:100 000 - Broad scale mapping, minimum of one hole per km2
1:25 000 - Approximately one borehole per 6.25ha, 8 to 16 holes per km2
Mt Coolum to Peregian Beach South
Lake Weyba
Yandina to Dunethin Rock
Pacific Paradise to Mt Coolum
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