smiths lake planning study volume 1: text - Great Lakes Council

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SOILS AND GEOTECHNICAL 18 Table 2-10 Groundwater Quality – Pump station sites (DPWS) Location Analyte Pump stn L Pump stn O Pump stn P Pump stn Q Pump stn R Pump stn U Lake water Field pH 6.2 6.1 6.8 5.5 6.4 6.6 7.4 Chloride 64 99 740 320 530 250 15000 Sulphate 60 9 80 60 50 3 1900 Cl/SO 4 (ratio by mass) 1.1 11 9.2 5.3 11 83 7.9 Iron 91 680 240 74 310 49 1.1 Aluminum 190 1200 350 180 780 210 10 Material 6m clay 2m sand rock 3m silt rock 2m sand Depth to groundwater (m) All results are expressed in mg/l, unless otherwise stated. & silt - rock - rock - rock 4.3 1.2 6 5.8 7.8 1.6 Table 2-11 outlines the criteria established for assessing the presence, or former presence, of acid sulphate soils based on the chloride to sulphate ratio and the pH of the samples. The groundwater samples indicate the presence of pyritic material which is in agreement with total sulphur values noted in Table 2-8. However the pH values suggest the presence of a buffering agent. It should be noted that the ratio of sulphate to chloride becomes less predictive with low salinity ratios and as such the results of the water analyses are not considered to be as reliable as those of the soil analyses for RCA 4 and 13. Table 2-11 EPA Criteria to Assess the Probable Presence of Pyritic Material pH Cl-:SO4-2 (by mass) Assessment 6 to 8 approx. 7 No pyritic material present or pyrite has not been oxidised at any time < 5 approx. 7 No pyritic material present or pyrite has not been oxidised at any time and low pH can be attributed to other causes 6 to 8 < 2, if < 4 do further analysis Presence of pyritic material plus the presence of a buffering agent < 5 < 2, if < 4 do further analysis Presence of pyritic material with little buffering agent Source: NSW EPA, DUAP, ASSMAC, 1997, Acid Sulphate Soils: Assessment and Management Guidelines. 2.4 Landuse 2.4.1 Smiths Lake Village Area The Smiths Lake Village Area (SLVA) comprises an urban residential area with sewer, town water, stormwater and electrical services. The roads are predominantly sealed with stormwater drainage via concrete kerb and gutters as well as unlined table drains. Residential development comprises predominantly brick structures founded on slab or strip / pad foundation systems with some pole frame residences on steep slope areas. On the moderate SMITHS_LAKE_PLANNING_STUDY.DOC O C E A N I C S A U S T R A L I A
SOILS AND GEOTECHNICAL 19 to steeper slopes, extensive cutting, filling and retaining wall construction has been undertaken for access and landscaping. 2.4.2 Smiths Lake Area The remainder of the study area comprises rural properties typically 5Ha to 30Ha in area with small urban residential communities at Tarbuck Bay and Charlotte Bay. Sandbar Caravan Park covers an area of about 1km 2 between Symes Bay and the beach at Cellito / Sandbar. Two small shale quarry pits are situated on the southern side of the access road to Sandbar. It is likely that these pits are or have been used as a local source of pavement gravels for minor roads. 2.5 Terrain Classification The study area can be subdivided into terrain units which outline areas of similar physical characteristics on the basis of landform, slope angle, drainage, soil type, soil origin and groundwater. Each terrain unit defines a set of physical characteristics that will impose constraints on landuse in terms of geotechnical hazards such as: • Slope stability • Soil erosion • Acid sulphate soils • Foundation bearing capacity Table 2-12 describes each of the terrain units in terms of physical characteristics and Table 2-13 outlines risks associated with geotechnical hazards for each of the terrain units. Table 2-12 Terrain Units – Physical Characteristics Unit Soil Origin Soil / Rock Type Typical soil depth (m) R1 Residual Clay and siltstone / sandstone rock R2 Residual Clay and siltstone Slope Gradient (%) Topography 40 Steep upper ridge slopes. Scarps along lake shore. 0.5 – 1 25 – 40 Ridge crests and upper to mid slopes / sandstone rock R3 Residual Clay 1 – 2 10 – 25 Rounded hillslopes and footslopes R4 Residual Clay >2 3 5 5 5 10 – 25 Gentle to moderate sandhills and sheets S3 Aeolian Sand >5 25 – 40 Moderate to steep sandhills S4 Aeolian Sand >5 >40 Very steep sand hills with soil creep SMITHS_LAKE_PLANNING_STUDY.DOC O C E A N I C S A U S T R A L I A
Page 1 and 2: SMITHS LAKE PLANNING STUDY VOLUME 1
Page 3 and 4: CONTENTS I CONTENTS 1 INTRODUCTION
Page 5 and 6: CONTENTS III 11.1 Sewer 128 11.2 Ot
Page 7 and 8: LIST OF FIGURES V Figure 8-1 Visual
Page 9 and 10: INTRODUCTION 1 1 INTRODUCTION 1.1 G
Page 11 and 12: INTRODUCTION 3 • visual quality;
Page 13 and 14: SOILS AND GEOTECHNICAL 5 2.2.2 Fiel
Page 15 and 16: SOILS AND GEOTECHNICAL 7 2.3.3 Geol
Page 17 and 18: SOILS AND GEOTECHNICAL 9 Table 2-3
Page 19 and 20: SOILS AND GEOTECHNICAL 11 rather th
Page 21 and 22: SOILS AND GEOTECHNICAL 13 soils wit
Page 23 and 24: SOILS AND GEOTECHNICAL 15 The resul
Page 25: SOILS AND GEOTECHNICAL 17 • RCA11
Page 29 and 30: SOILS AND GEOTECHNICAL 21 Based on
Page 31 and 32: SOILS AND GEOTECHNICAL 23 • Mediu
Page 33 and 34: SOILS AND GEOTECHNICAL 25 There are
Page 35 and 36: FLOODING AND DRAINAGE 27 3 FLOODING
Page 37 and 38: FLOODING AND DRAINAGE 29 3.2 Floodi
Page 39 and 40: FLOODING AND DRAINAGE 31 3.2.3 Floo
Page 41 and 42: FLOODING AND DRAINAGE 33 the perime
Page 43 and 44: STORMWATER MANAGEMENT 35 This study
Page 45 and 46: STORMWATER MANAGEMENT 37 Figure 4-4
Page 47 and 48: STORMWATER MANAGEMENT 39 4.4.7 Sedi
Page 49 and 50: STORMWATER MANAGEMENT 41 4.5.4 Swal
Page 51 and 52: STORMWATER MANAGEMENT 43 Table 4-1
Page 53 and 54: FLORA 45 characteristics. Some vege
Page 55 and 56: FLORA 47 mahogany (Eucalyptus robus
Page 57 and 58: FLORA 49 Distribution: This forest
Page 59 and 60: FLORA 51 Distribution: This forest
Page 61 and 62: FLORA 53 5.2.23 Scrub (224) Structu
Page 63 and 64: FLORA 55 Species Significance & Dis
Page 65 and 66: FLORA 57 Species Significance & Dis
Page 67 and 68: FLORA 59 5.4.7 Swamp Oak (32) Distr
Page 69 and 70: FLORA 61 5.4.17 Spotted Gum (70) Di
Page 71 and 72: FLORA 63 Forest Type Description Co
Page 73 and 74: FAUNA 65 6.1.4 Swamp Oak (32) Habit
Page 75 and 76: FAUNA 67 heathland shrub layer woul
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FAUNA 69 of the tree adjacent to th
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FAUNA 71 Common Name Scientific Nam
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FAUNA 73 Common Name Scientific Nam
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FAUNA 75 6.4.1.1 Community Habitat
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FAUNA 77 6.4.2 Problems with the Me
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FAUNA 79 6.6.3 Development of Mediu
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WATER QUALITY SENSITIVITY MAPPING 8
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VISUAL AND SCENIC QUALITY 87 Rural
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VISUAL AND SCENIC QUALITY 89 • mi
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VISUAL AND SCENIC QUALITY 91 8.3.1
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VISUAL AND SCENIC QUALITY 93 Sensit
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LAND CAPABILITY ASSESSMENT 95 9 LAN
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LAND CAPABILITY ASSESSMENT 97 Time
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LAND CAPABILITY ASSESSMENT 99 Envir
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LAND CAPABILITY ASSESSMENT 101 Envi
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ABORIGINAL AND EUROPEAN HERITAGE 10
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INFRASTRUCTURE 129 11.2 Other Servi
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BUSHFIRE MANAGEMENT INVESTIGATION 1
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LAND SUITABILITY ASSESSMENT 139 13
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LAND SUITABILITY ASSESSMENT 141 lin
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LAND SUITABILITY ASSESSMENT 143 13.
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LAND SUITABILITY ASSESSMENT 145 The
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LAND SUITABILITY ASSESSMENT 147 13.
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LAND SUITABILITY ASSESSMENT 149 The
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REFERENCES 151 Floyd, A.G. (1990)
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