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Geotechnical Investigation Report.Docx GEOTECHNICAL INVESTIGATION FOR THE PROPOSED ALICEDALE RELIEF RISING MAIN PREPARED BY: ISSUED TO: GIBB (PTY) LTD P.O. BOX 63703 Greenacres 6057 July 2016 Form 403.1 {'':lr'\r Stl'a| VERIFICATION PAGE Ce0tc.ltrl.!l & tin!lroDnrcntal Consultdtrts Rev 10/06 GEOTECHNICAL INVESTIGATION FOR THE PROPOSED ALICEDALE RELIED RISING MAIN JOB NO:41650 DATE: Julv 2016 REPORT STATUS: FINAL REPORT CARRIED OUT BY: COMMISSIONED BY: Terratest (Pty) Ltd Gibb (Pty) Ltd P.O. Box 27308 P.O, Box 63703 GREENACRES Greenacres 6057 6057 Tel: (041) 363 4428 Tel: (041) 392 7500 Fax: (041) 3631922 AUTHOR: CLIENT CONTACT PERSONS: Mr. L Parfitt Mr. J Barnard SYNOPSIS: GEOTECHNICAL INVESTIGATION FOR THE PROPOSED ALICEDALE RELIEF RISING MAIN KEY WORDS: Geotechnical, geology @ COPYRIGHT: Terratest (Pty) Ltd. QUALITY VERIFICATION This report has been prepared under the controls established by a quality management system that meets the requirements of lSO9001: 2008 which has been independently certified by DEKRA Certification under certificate number 90906882 Verification Capacity Name Signature Date By Author Geologist Mr L Parfitt July 2016 Checked by Snr Engineering Geologist Mr R Fyvie 4v July 2016 Authorised by Executive Associate Mr R Fyvie ry+ July 2016 GEOTECHNICAL INVESTIGATION FOR THE PROPOSED ALICEDALE RELIEF RISING MAIN CONTENTS 1. INTRODUCTION ................................................................................................ 4 2. TERMS OF REFERENCE .................................................................................. 6 3. DATA BASE ....................................................................................................... 6 4. SITE DESCRIPTION .......................................................................................... 6 4.1. Topography ............................................................................................... 6 4.2. Vegetation, Landuse and Infrastructure ..................................................... 7 4.3. Access ....................................................................................................... 7 5. GEOLOGY AND GEOHYDROLOGY ................................................................. 7 6. FIELD INVESTIGATION .................................................................................... 9 6.1. Trial Pits ..................................................................................................... 9 6.2. Laboratory Testing ................................................................................... 10 7. GROUNDWATER ............................................................................................ 10 8. LABORATORY RESULTS ............................................................................... 10 9. GENERAL STABILITY OF THE SITE .............................................................. 12 10. PIPELINE GEOTECHNICAL APPRAISAL .................................................... 12 10.1. Material Specifications ............................................................................. 12 10.2. Design Specifications. .............................................................................. 13 10.3. Excavation Conditions ............................................................................. 13 10.4. Problem Areas ......................................................................................... 14 10.5. Flooding and Erosion ............................................................................... 15 10.6. Usability of Trench Materials .................................................................... 16 10.7. Construction Materials ............................................................................. 17 11. DEVELOPMENT RECOMMENDATIONS ..................................................... 17 11.1. Pumpstation ............................................................................................. 17 12. CONCLUSION .............................................................................................. 19 13. REFERENCES ............................................................................................. 20 P:\01 TERRATEST\41650 - Alicedale Relief Rising Main Geotech\07 REPORTS\Geotechnical Investigation Report.docx JULY 2016 LIST OF TABLES AND FIGURES Figure 1: Locality Plan ............................................................................................... 5 Figure 2: Geological Map .......................................................................................... 8 Table 6.1: Trial Pit coordinates .................................................................................. 9 Table 8.1: Atterberg Limit Determination Test Results ............................................. 11 Table 8.2: MOD/CBR Relationship .......................................................................... 11 Table 10.1: Excavation class descriptions ............................................................... 13 Table 10.2: Estimated excavation classes ............................................................... 14 Table 10.3: Sources of Selected Fill Material .......................................................... 16 APPENDICES APPENDIX A: TRIAL PIT PROFILES AND PHOTOGRAPHIC PLATES APPENDIX B: LABORATORY TEST RESULTS P:\01 TERRATEST\41650 - Alicedale Relief Rising Main Geotech\07 REPORTS\Geotechnical Investigation Report.docx JULY 2016 4 1. INTRODUCTION This report presents the results of a geotechnical investigation undertaken for the proposed Relief Rising Main in Alicedale, as depicted in Figure 1: Locality Plan. The investigation spanned from the westernmost boundary of Alicedale, along the railway line, up to and including the north-westernmost section of Kwanonzwakazi Informal Settlement in the east. The objectives of the investigation comprised an assessment of the surface and subsurface geotechnical characteristics, in respect of the following: • The identification and analysis of potentially adverse conditions, including problem soils and substrata and areas of high water table; • Ease of excavation to the proposed pipeline trench invert level; • The usability of the excavated trench materials for construction purposes; • Any other factors that, from a geological or geotechnical context, could impact on the construction of the project. The fieldwork for the investigation was undertaken on June 30 th 2016. All trial pits were profiled by a Terratest Geologist in accordance with methods outlined by Jennings et al. (1973). The subsoil and rock conditions beneath the site are described and comment is made on the general suitability of the site for development. Recommendations for earthworks, drainage, ease of excavation, and foundation design are provided. The information in this report is given in good faith as an indication of materials and conditions likely to be encountered during construction. Any opinions and interpretations expressed are given as a guide only. There is no warranty that the information is totally representative of the whole area and no responsibility will be accepted for any consequences arising from actual conditions being different from those indicated in this document. P:\01 TERRATEST\41650 - Alicedale Relief Rising Main Geotech\07 REPORTS\Geotechnical Investigation Report.docx JULY 2016 5 Figure 1: Locality Plan P:\01 TERRATEST\41650 - Alicedale Relief Rising Main Geotech\07 REPORTS\Geotechnical Investigation Report.docx JULY 2016 6 2. TERMS OF REFERENCE Terratest (Pty) Ltd were invited by Gibb (Pty) Ltd to prepare a proposal and cost estimate to conduct a geotechnical investigation for the proposed Relief Rising Main. A quotation dated 26 April 2016, referenced 3113/93/002/LW/lw, was submitted and the notification of acceptance was received via email on 16 May 2016. 3. DATA BASE The following information was provided by Gibb : • KMZ GoogleEarth file indicating the position of proposed trial pits. • PDF locality plan indicating the proposed trial pit positions, as well as the proposed pipeline alignment. • Plans, including longitudinal sections for both Option 1 and Option 2. The trial pit positions were shown to Terratest’s Geologists by Gibb’s Mr Jacques Barnard during a site walkover on June 30 th 2016. 4. SITE DESCRIPTION The investigation site is located in Alicedale, in the interior region of the Eastern Cape, figure 1. Alicedale is located approximately 30km from Paterson, using the National Route 10 and the subsequent MR476. The investigation site covers the town of Alicedale for the most part and incorporates the north-westernmost section of Kwanonzwakazi Informal Settlement. The Bushmans River runs just north of the town, with its associated drainage features contributing to the variable topography. 4.1. Topography Elevations across the investigation area range from approximately 282 meters above mean sea level (mamsl) at the westernmost point (ATP08), to approximately 305 mamsl at the easternmost point (ATP06). The topography of the area is generally flat to undulating, owing to the proximity of the Bushmans River and previous periods of regional tectonic uplift. P:\01 TERRATEST\41650 - Alicedale Relief Rising Main Geotech\07 REPORTS\Geotechnical Investigation Report.docx JULY 2016 7 4.2. Vegetation, Landuse and Infrastructure The natural vegetation covering investigation area is Albany Broken Veld, comprised of grassy dwarf shrubland, scattered low trees and grasses. Existing infrastructure that was encountered included surfaced roads, formal residential housing, railway infrastructure, overhead
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