REPORT. Housing Re-Zone. Middle Road and Iona Road - Geotechnical Investigation Report

Transcription

1 REPORT Housing Re-Zone Middle Road and Iona Road - Geotechnical Investigation Report Prepared for Hastings istrict Council Prepared by Tonkin & Taylor Ltd ate April 06 Job Number

2 istribution: Hastings istrict Council Tonkin & Taylor Ltd (ILE) copies copy

3 Table of contents Introduction. General. Site escription Geotechnical Investigations Geological Setting. Regional Geology. Subsurface Stratigraphy. Groundwater 4 Geotechnical Considerations 4. General 4. Seismic Assessment 4.. Site Subsoil Class 4.. Seismic loading to be applied to liquefaction assessment 4.. Liquefaction potential 4. Slope Stability Earthworks oundations 4 5 Conclusions 5 6 Applicability 6 Appendix A : Appendix B : Site Investigation Plan Test Pit Logs Tonkin & Taylor Ltd Housing Re-Zone - Middle Road and Iona Road - Geotechnical Investigation Report Hastings istrict Council April 06 Job No:

4 Introduction. General Hastings istrict Council (HC) has engaged Tonkin + Taylor Ltd (T+T) to undertake a preliminary geotechnical assessment of a block of land in Havelock North. This geotechnical assessment was carried out as part of the proposed zone (land use) review that HC are currently undertaking. This report presents the results of geotechnical investigations undertaken on sites between Middle Road and Iona Road, Hastings, in ebruary 06 and outlines the potential geotechnical issues that may affect future residential development at those sites. The scope of work undertaken for this report comprised: Geotechnical investigations comprising No. test pits; evelopment of a geological model for the site; evelopment of recommended geotechnical design parameters including site seismic design characteristics, Assessment potential geotechnical risks that may affect future residential development; Assessment of potential foundation options; and Preparation of this report.. Site escription The sites being considered as part of the re-zone review are located in a triangular shaped section between 9 to 67 Middle Road and 58 to Iona Road in Havelock North, Hastings, as shown on igure in Appendix A. The geotechnical assessment covered approximately 6.5 ha of land. At present, the sites are a mix of private residential property and grazing land. The site generally slopes down from the higher south-eastern Iona Road side to the lower northern Middle Road side. The site has small hills and gullies, with one main knoll in the southern lot and a main stream gully crossing a northern lot that contains a stormwater outlet. There are also other smaller stream / valley paths and a pond in the middle lot that borders Iona Road (highlighted on igure in Appendix A). Geotechnical Investigations Investigations were carried out between and 4 ebruary 06 under the supervision of a geotechnical engineer from T+T. The investigation comprised No. test pits (TP0 to TP) excavated using a 6 tonne excavator supplied and operated by Ltd. On completion, test pits were backfilled with material excavated from the pits and nominal compaction was applied with the excavator bucket. The locations of the geotechnical investigations are presented on the layout plan (ref. igure ) in Appendix A. Test pits were excavated to depths of 5 m to. m below existing ground level to assess subsurface conditions. The information obtained from the investigations has been used in developing a typical ground model for the site. Tonkin & Taylor Ltd Housing Re-Zone - Middle Road and Iona Road - Geotechnical Investigation Report Hastings istrict Council April 06 Job No:

5 Geological Setting. Regional Geology Published geology indicates the site is underlain by a variable group of middle to late Pleistocene alluvial fan deposits, collectively known as the Kidnappers Group. These typically consist of extremely to very weak siltstones and sandstones. A weathered cap of sandy silt often overlies the sandstone rock. Our preliminary geotechnical investigations have generally confirmed the published geology.. Subsurface Stratigraphy Topsoil was encountered across the entire site, which was generally underlain by siltstones and sandstones of the Kidnappers Group. Test pits TP04,, 9, & were positioned within gully features and encountered sands and gravels that were identified as alluvium; bedrock was not proven in these test pits. These deposits are consistent with historical T+T investigations within nearby gullies. The general stratigraphy of the site is summarised in Table.. Table.: Geological Profile of the Site Layer No. Unit escription epth to top of layer (m begl) Topsoil Sandy SILT; brown, rootlets present. irm, dry. Residual soil Sandy SILT; light brown/grey, rootlets present. ry Alluvium (Present in test pits TP04,, 9, and only) Sandy/clayey SILT; fine sand, light brown mottled with light grey, rounded gravels/cobbles often present. irm/stiff. 4 Kidnappers Group Highly Weathered light brown SANSTONE, extremely weak.. Groundwater Groundwater was not encountered in any of the test pits in this investigation. Layer thickness (m) > 5 epth of alluvium not proven in gully features 0..6 Extent not proven We note that some seasonal fluctuations in groundwater levels should be expected and the groundwater regime should be subject to further assessment. Lee, J.M. et al (0). Institute of Geological & Nuclear Sciences : 000 Geological Map 8. Geology of the Hawke s Bay area. GNS Science. Kingma, J.T. (97). Geological Map of New Zealand :6 60, Sheets N4 Napier and Hastings and N5 Kidnappers. epartment of Scientific and Industrial Research. Tonkin & Taylor Ltd Housing Re-Zone - Middle Road and Iona Road - Geotechnical Investigation Report Hastings istrict Council April 06 Job No:

6 4 Geotechnical Considerations 4. General Recommendations and opinions in this report are based on data from a site walkover, and subsurface investigations at point locations. The nature and continuity of subsurface conditions away from the test locations are inferred and it must be appreciated that actual conditions may vary from the assumed model. 4. Seismic Assessment 4.. Site Subsoil Class A seismic assessment has been undertaken for the proposed development in accordance with the recommendations in the NZTA Bridge Manual and the New Zealand Code of Practice NZS 7: The design earthquakes for serviceability and ultimate limit states have been adopted as in 5 years and in 0 years respectively, with a building Importance Level. Should the Importance Level change during the design, the seismic assessment will need to be revised. As the depth to rock is generally shallow we have classified the site as Class B Rock, with the exception of the alluvial area where further investigations are required. 4.. Seismic loading to be applied to liquefaction assessment The peak ground acceleration (PGA) for liquefaction assessment under serviceability limit state and ultimate limit state are set out in Table 5. below. The design PGA is derived based on the recommended return periods (T) in NZS 7:004 4 and using the following formula, as given in NZTA Bridge Manual Error! Bookmark not defined. (which is considered more appropriate for liquefaction analysis) PGA = C 0,000 Ru/. f g where: C 0,000 = 0.40 for Subsoil Class B, Hastings Ru =.0 and for (T = in 0 and in 5 years respectively) f =.0, Subsoil Class B Table 4.: esign Peak Ground Acceleration for Liquefaction Assessment esign Life* (years) Serviceability Limit State (SLS) Annual Exceedance Probability Peak Ground Acceleration Ultimate Limit State (ULS) Annual Exceedance Probability Peak Ground Acceleration /5 0.08g /0 0.g 4.. Liquefaction potential As part of this report, T+T has not undertaken quantitative liquefaction analysis. A qualitative analysis has been undertaken from a visual appraisal of the materials within the test pits. The NZ Transport Agency s Bridge Manual Sp/M/0, Third Edition, Amendment 0, May 0 4 NZS7:004. Structural esign Actions Earthquake Actions (New Zealand), SANZ. Tonkin & Taylor Ltd Housing Re-Zone - Middle Road and Iona Road - Geotechnical Investigation Report Hastings istrict Council April 06 Job No:

7 4 The liquefaction susceptibility across the majority of the proposed site is generally very low due to the presence of the Kidnappers Group sandstone at shallow depth and the absence of groundwater. The weathered soils of the Kidnappers Group are generally stiff and cohesive in nature, accordingly are very unlikely to liquefy in an earthquake event. Gully features and areas underlain by alluvial soils may be susceptible to liquefaction in the event of an earthquake. However, we recommend further investigation is undertaken to characterise and delineate alluvial materials. 4. Slope Stability In general the site comprises flat, slightly rolling topography with the exception of the knoll forming the centre west of the site. No signs of instability were observed during the site walkover. We do not recommended cut platforms exceed grades of more than V:4H. However, sites that do not conform to this grade could be developed with site specific analysis and suitably developed retention measures. 4.4 Earthworks We expect that minor earthworks will be required to form the required dwelling platforms and roads. Some filling of the gullies may be required to raise levels across the site. Gullys and areas with thick alluvial deposits may require some form of ground improvement such as removal and replacement with engineered fill or pre-loading. We recommend further investigations such as machine boreholes, laboratory testing and cone penetration tests (CPTs) be undertaken to characterise and delineate such soils if these areas are to be utilised for residential development. The No. test pits that were excavated as part of this geotechnical investigation were backfilled and compacted only with the excavator bucket. If buildings or access roads are to be located across these test pits, care should be taken to excavate and backfill the pits with engineered fill. 4.5 oundations Based on the results of the site investigations, we consider shallow foundations in accordance with NZS 604:0 5 bearing good ground will be generally appropriate for typical residential structures. uring detailed design, lot specific investigations such as hand augers (with shear vane measurements), Scala penetrometers and additional test pits should be carried out to determine bearing capacities for each proposed site. Site specific foundation design should be undertaken where alluvial soils were encountered. 5 NZS 604:0. Timber-framed buildings. SANZ. Tonkin & Taylor Ltd Housing Re-Zone - Middle Road and Iona Road - Geotechnical Investigation Report Hastings istrict Council April 06 Job No:

8 5 5 Conclusions Based on the results of the site investigation, we believe the investigation area is generally suitable for residential development. The key conclusions of our assessment are as follows: The site is typically underlain by Kidnappers Group sandstone and siltstone. Pockets of alluvial deposits (interbedded sand and silt) were encountered in localised gullies across the site. The Kidnappers Group is considered to have negligible susceptibility to liquefaction. or alluvial and gully deposits, further investigation and laboratory testing are recommended to further characterise and delineate these materials. Minor earthworks may be required to form platforms and fill gullies. 4 Areas with thick alluvial deposits may require some form of ground improvement such as removal and replacement with engineered fill or pre-loading. 5 We recommend that site specific foundation assessments be carried out where alluvial soils were encountered to allow site specific earthwork and foundation design. 6 Shallow foundations in accordance with NZS 604:0 5 bearing on good ground are considered to be generally appropriate for typical residential structures. 7 uring detailed design, lot specific investigations such as hand augers (with shear vane measurements), Scala penetrometers and additional test pits should be carried out to confirm the underlying geological conditions for each proposed site. Tonkin & Taylor Ltd Housing Re-Zone - Middle Road and Iona Road - Geotechnical Investigation Report Hastings istrict Council April 06 Job No:

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10 7 Appendix A : Site Investigation Plan Tonkin & Taylor Ltd Housing Re-Zone - Middle Road and Iona Road - Geotechnical Investigation Report Hastings istrict Council April 06 Job No:

11 L:\464\ \WorkingMaterial\CA\IG\ dwg, 0, /0/06 :09:0 p.m., agds ORIGINAL IN COLOUR 05 Carlton Gore Road, Newmarket, Auckland

12 Appendix B : Test Pit Logs TP0 to TP

13 EXCAVATION No: TP0 Hole Location: 67 Middle Road SHEET O PROJECT: Re-zoning Housing Middle Road LOCATION: Havelock North JOB No: mn 95 me.80 m.4m x.5m x 0.44 EXCAV. STARTE: //6 EXCAV INISHE: //6 (m) SECONARY AN MINOR COMPONENTS CONITION WEATHERING STRENGTH / ENSITY ESTIMATE EECTS, STRUCTURE : Sandy SILT; brown, rootlets. ry..5 Sandy SILT; light brown, rootlets present. irm, dry [Residual Soil]. Highly weathered, light brown fine grained SANSTONE. Very weak. EN O AT 0.44m. VW KINAPPERS GROUP Unable to excavate further T+T_ATATEMPLATE.GT jlb Log Scale :0.8 EXCAVLOG 464.GPJ -Mar-06

14 EXCAVATION No: TP0 Hole Location: 67 Middle Road SHEET O PROJECT: Re-zoning Housing Middle Road LOCATION: Havelock North JOB No: mn me.0 m 0.7m x.5m x 0.9m EXCAV. STARTE: //6 EXCAV INISHE: //6 (m) SECONARY AN MINOR COMPONENTS CONITION WEATHERING STRENGTH / ENSITY ESTIMATE EECTS, STRUCTURE : Sandy SILT; brown, rootlets. irm, dry..0 Sandy SILT; light brown/light grey, rootlets present. irm, dry; sand, fine. [Residual Soil] KINAPPERS GROUP Highly weathered, light brown fine grained SANSTONE. Very weak. 0.8m: trace calcareous nodules. EN O AT 0.9m. Unable to excavate further. VW T+T_ATATEMPLATE.GT jlb Log Scale :0.8 EXCAVLOG 464.GPJ -Mar-06

15 EXCAVATION No: TP0 Hole Location: 67 Middle Road SHEET O PROJECT: Re-zoning Housing Middle Road LOCATION: Havelock North JOB No: mn me 0.00 m (m) m x m x 0.6m SECONARY AN MINOR COMPONENTS : Sandy SILT; brown, rootlets. irm, dry. EXCAV. STARTE: //6 EXCAV INISHE: //6 CONITION WEATHERING STRENGTH / ENSITY ESTIMATE EECTS, STRUCTURE Highly weathered, light brown fine grained SANSTONE. Very weak. VW KINAPPERS GROUP 9.5 EN O AT 0.6m. Unable to excavate further T+T_ATATEMPLATE.GT jlb Log Scale :0.8 EXCAVLOG 464.GPJ -Mar-06

16 EXCAVATION No: TP04 Hole Location: 67 Middle Road SHEET O PROJECT: Re-zoning Housing Middle Road LOCATION: Havelock North JOB No: mn me 0.80 m 0.7m x.5m x.4m EXCAV. STARTE: //6 EXCAV INISHE: //6 (m) SECONARY AN MINOR COMPONENTS CONITION WEATHERING STRENGTH / ENSITY ESTIMATE EECTS, STRUCTURE : Sandy SILT; brown, rootlets. irm, dry. Silty, fine SAN; light brown/light grey, trace rootlets. Loose, dry. L ALLUVIUM SILT, with fine sand; light brown. irm, moist. M Clayey SILT; light brown, mottled with grey/black, dark brown. Very stiff, moist. VSt UTP becoming more clayey; light brown, mottled dark brown/grey, speckled inclusions of black. Moist..6m: becoming firmer m: Clayey SILT, trace sand, trace organics. Moist, low plasticity. EN O AT.4m. T+T_ATATEMPLATE.GT jlb Log Scale :0.8 EXCAVLOG 464.GPJ -Mar-06

17 EXCAVATION No: TP05 Hole Location: 67 Middle Road SHEET O PROJECT: Re-zoning Housing Middle Road LOCATION: Havelock North JOB No: mn me 8.0 m 0.7m x.5m x.m EXCAV. STARTE: //6 EXCAV INISHE: //6 (m) SECONARY AN MINOR COMPONENTS CONITION WEATHERING STRENGTH / ENSITY ESTIMATE EECTS, STRUCTURE : Sandy SILT; brown, rootlets. irm, dry. 8.0 Sandy SILT; light brown/light grey, rootlets present. irm, dry; sand, fine. [Residual Soil] KINAPPERS GROUP 7.5 Silty, fine SAN; light brown. Stiff, weakly cemented. [Completely weathered SANSTONE] St m: becoming very stiff. VSt m: becoming moist. EN O AT.m. M T+T_ATATEMPLATE.GT jlb Log Scale :0.8 EXCAVLOG 464.GPJ -Mar-06

18 EXCAVATION No: TP06 Hole Location: 67 Middle Road SHEET O PROJECT: Re-zoning Housing Middle Road LOCATION: Havelock North JOB No: mn me 6.00 m 6.5 (m) m x m x 0.6m SECONARY AN MINOR COMPONENTS : Sandy SILT; brown, rootlets. irm, dry. EXCAV. STARTE: //6 EXCAV INISHE: //6 CONITION WEATHERING STRENGTH / ENSITY ESTIMATE EECTS, STRUCTURE Highly weathered, light brown fine grained SANSTONE. Very weak. VW KINAPPERS GROUP 5.5 EN O AT 0.6m. Unable to excavate further T+T_ATATEMPLATE.GT jlb Log Scale :0.8 EXCAVLOG 464.GPJ -Mar-06

19 EXCAVATION No: TP07 Hole Location: 67 Middle Road SHEET O PROJECT: Re-zoning Housing Middle Road LOCATION: Havelock North JOB No: mn 948 me 4.0 m 0.7m x m x 0.65m EXCAV. STARTE: //6 EXCAV INISHE: //6 (m) SECONARY AN MINOR COMPONENTS CONITION WEATHERING STRENGTH / ENSITY ESTIMATE EECTS, STRUCTURE 4.0 : Sandy SILT; brown, rootlets. irm, dry. Sandy SILT; light brown/light grey. Stiff, dry. [Residual Soil] St KINAPPERS GROUP Highly weathered, light brown fine grained SANSTONE. Very weak. VW.5 EN O AT 0.65m. Unable to excavate further T+T_ATATEMPLATE.GT jlb Log Scale :0.8 EXCAVLOG 464.GPJ -Mar-06

20 EXCAVATION No: TP08 Hole Location: 67 Middle Road SHEET O PROJECT: Re-zoning Housing Middle Road LOCATION: Havelock North JOB No: mn me 0.00 m (m) m x m x 0.65m SECONARY AN MINOR COMPONENTS : Sandy SILT; brown, rootlets. irm, dry. EXCAV. STARTE: //6 EXCAV INISHE: //6 CONITION WEATHERING STRENGTH / ENSITY ESTIMATE EECTS, STRUCTURE Sandy SILT; light brown/light grey, rootlets present. Stiff, dry; sand, fine. [Residual Soil] St KINAPPERS GROUP 9.5 Highly weathered, light brown fine grained SANSTONE. Very weak. VW EN O AT 0.65m. Unable to excavate further T+T_ATATEMPLATE.GT jlb Log Scale :0.8 EXCAVLOG 464.GPJ -Mar-06

21 EXCAVATION No: TP09 Hole Location: 57 MIddle Road SHEET O PROJECT: Re-zoning Housing Middle Road LOCATION: Havelock North JOB No: mn 95 me.00 m.5 (m).0 0.7m x m x 0.75m SECONARY AN MINOR COMPONENTS : Sandy SILT; brown, rootlets. irm, dry. EXCAV. STARTE: //6 EXCAV INISHE: //6 CONITION WEATHERING STRENGTH / ENSITY ESTIMATE EECTS, STRUCTURE Sandy SILT; light brown/light grey, rootlets present. Stiff, dry; sand, fine. [Residual Soil] St KINAPPERS GROUP.5 Highly weathered, light brown fine grained SANSTONE. Very weak. VW EN O AT 0.75m..0.0 Unable to excavate further T+T_ATATEMPLATE.GT jlb Log Scale :0.8 EXCAVLOG 464.GPJ -Mar-06

22 EXCAVATION No: TP0 Hole Location: 57 MIddle Road SHEET O PROJECT: Re-zoning Housing Middle Road LOCATION: Havelock North JOB No: mn 9574 me 7.0 m 0.7m x m x 0.6m EXCAV. STARTE: //6 EXCAV INISHE: //6 (m) SECONARY AN MINOR COMPONENTS CONITION WEATHERING STRENGTH / ENSITY ESTIMATE EECTS, STRUCTURE 7.0 : Sandy SILT; brown, rootlets. irm, dry. Sandy SILT; light brown/light grey, rootlets present. Stiff, dry; sand, fine. [Residual Soil] St Highly weathered, light brown fine grained SANSTONE. Very weak. VW KINAPPERS GROUP 6.5 EN O AT 0.6m> Unable to excavate further T+T_ATATEMPLATE.GT jlb Log Scale :0.8 EXCAVLOG 464.GPJ -Mar-06

23 EXCAVATION No: TP Hole Location: 40 Middle Road SHEET O PROJECT: Re-zoning Housing Middle Road LOCATION: Havelock North JOB No: mn me.00 m.5 (m).0 0.7m x m x 0.9m SECONARY AN MINOR COMPONENTS : Sandy SILT; brown, rootlets. irm, dry. EXCAV. STARTE: //6 EXCAV INISHE: //6 CONITION WEATHERING STRENGTH / ENSITY ESTIMATE EECTS, STRUCTURE.5 Sandy SILT; light brown/light grey, rootlets present. irm, dry; sand, fine. Tree branches present. [Residual Soil reworked with Topsoil] Highly weathered, light brown fine grained SANSTONE. Very weak. VW KINAPPERS GROUP.0.0 EN O AT 0.9m. Unable to excavate further. Groundwater not encountered..5.0 T+T_ATATEMPLATE.GT jlb Log Scale :0.8 EXCAVLOG 464.GPJ -Mar-06

24 EXCAVATION No: TP Hole Location: 40 Middle Road SHEET O PROJECT: Re-zoning Housing Middle Road LOCATION: Havelock North JOB No: mn 964. me 0.70 m 0.7m x.5m x.7m EXCAV. STARTE: //6 EXCAV INISHE: //6 (m) SECONARY AN MINOR COMPONENTS CONITION WEATHERING STRENGTH / ENSITY ESTIMATE EECTS, STRUCTURE : Sandy SILT; brown, rootlets. irm, dry. Sandy SILT; light brown, mottled light grey, rootlets present. irm, dry. [Residual Soil] ALLUVIUM Clayey SILT, with fine sand; light brown mottled with light grey, some rootlets/tree branches present. Stiff, moist. M St 9.0 EN O AT.7m. Groundwater not encountered T+T_ATATEMPLATE.GT jlb Log Scale :0.8 EXCAVLOG 464.GPJ -Mar-06

25 EXCAVATION No: TP Hole Location: 0 Iona Road SHEET O PROJECT: Re-zoning Housing Middle Road LOCATION: Havelock North JOB No: mn me 4.00 m 4.5 (m) m x m x 0.6m SECONARY AN MINOR COMPONENTS : Sandy SILT; brown, rootlets. irm, dry. EXCAV. STARTE: //6 EXCAV INISHE: //6 CONITION WEATHERING STRENGTH / ENSITY ESTIMATE EECTS, STRUCTURE Sandy SILT; light brown/light grey, rootlets present. irm, dry; sand, fine. [Residual Soil] KINAPPERS GROUP.5 Highly weathered, light brown fine grained SANSTONE. Very weak. VW EN O AT 0.6m. Unable to excavate further T+T_ATATEMPLATE.GT jlb Log Scale :0.8 EXCAVLOG 464.GPJ -Mar-06

26 EXCAVATION No: TP4 Hole Location: 57 Middle Road SHEET O PROJECT: Re-zoning Housing Middle Road LOCATION: Havelock North JOB No: mn me.60 m 0.7m x m x m EXCAV. STARTE: //6 EXCAV INISHE: //6 (m) SECONARY AN MINOR COMPONENTS CONITION WEATHERING STRENGTH / ENSITY ESTIMATE EECTS, STRUCTURE.5 : Sandy SILT; brown, rootlets. irm, dry. Sandy SILT; light brown, rootlets present. irm, dry; sand, fine. KINAPPERS GROUP.0 Highly weathered, light brown fine grained SANSTONE. Very weak. EN O AT m. Unable to excavate further. VW T+T_ATATEMPLATE.GT jlb Log Scale :0.8 EXCAVLOG 464.GPJ -Mar-06

27 EXCAVATION No: TP5 Hole Location: 0 Iona Road, near driveway SHEET O PROJECT: Re-zoning Housing Middle Road LOCATION: Havelock North JOB No: mn 967 me 8. m 9.0 (m) 8.5 SAN; light brown. 0.7m x m x 5m SECONARY AN MINOR COMPONENTS : Sandy SILT; brown, rootlets. irm, dry. EXCAV. STARTE: 4//6 EXCAV INISHE: 4//6 CONITION WEATHERING STRENGTH / ENSITY ESTIMATE ILL EECTS, STRUCTURE 8.0 Sandy SILT; light brown/light grey, rootlets present. irm, dry; sand, fine. [Residual Soil] 0.m: Seam of ash/tephra. Highly weathered, light brown fine grained SANSTONE. Very weak. EN O AT 5m. VW KINAPPERS GROUP Unable to excavate further T+T_ATATEMPLATE.GT jlb Log Scale :0.8 EXCAVLOG 464.GPJ -Mar-06

28 EXCAVATION No: TP6 Hole Location: 0 Iona Road, near corner of homestead in paddock SHEET O PROJECT: Re-zoning Housing Middle Road LOCATION: Havelock North JOB No: mn 976 me 0.00 m (m) m x m x 0.6m SECONARY AN MINOR COMPONENTS : Sandy SILT; brown, rootlets. irm, dry. EXCAV. STARTE: 4//6 EXCAV INISHE: 4//6 CONITION WEATHERING STRENGTH / ENSITY ESTIMATE EECTS, STRUCTURE Sandy SILT; light brown/light grey, rootlets present. irm, dry; sand, fine. [Residual Soil] KINAPPERS GROUP 9.5 Highly weathered, light brown fine grained SANSTONE. Very weak. VW EN O AT 0.6m. Unable to excavate further T+T_ATATEMPLATE.GT jlb Log Scale :0.8 EXCAVLOG 464.GPJ -Mar-06

29 EXCAVATION No: TP7 Hole Location: Iona Road, corner of paddock. SHEET O PROJECT: Re-zoning Housing Middle Road LOCATION: Havelock North JOB No: mn me 5.00 m 5.5 (m) m x m x 0.6m SECONARY AN MINOR COMPONENTS : Sandy SILT; brown, rootlets. irm, dry. EXCAV. STARTE: 4//6 EXCAV INISHE: 4//6 CONITION WEATHERING STRENGTH / ENSITY ESTIMATE EECTS, STRUCTURE Sandy SILT; light brown/light grey, rootlets present. irm, dry; sand, fine. KINAPPERS GROUP 4.5 Highly weathered, light brown fine grained SANSTONE. Very weak. m: Thin seam of ash/tephra. EN O AT 0.6m. VW Unable to excavate further T+T_ATATEMPLATE.GT jlb Log Scale :0.8 EXCAVLOG 464.GPJ -Mar-06

30 EXCAVATION No: TP8 Hole Location: 0 Iona Road SHEET O PROJECT: Re-zoning Housing Middle Road LOCATION: Havelock North JOB No: mn me 9.00 m 9.5 (m) m x m x 0.75m SECONARY AN MINOR COMPONENTS : Sandy SILT; dark brown, rootlets. irm, dry. EXCAV. STARTE: 4//6 EXCAV INISHE: 4//6 CONITION WEATHERING STRENGTH / ENSITY ESTIMATE EECTS, STRUCTURE Sandy SILT; very light grey, micaceous, rootlets present. irm, seam of tephra/ash. KINAPPERS GROUP 8.5 Highly weathered, light brown fine grained SANSTONE. Very weak. VW 0.7m: Becomes more cemented. EN O AT 0.75m Unable to excavate further T+T_ATATEMPLATE.GT jlb Log Scale :0.8 EXCAVLOG 464.GPJ -Mar-06

31 EXCAVATION No: TP9 Hole Location: 0 Iona Road, middle of paddock SHEET O PROJECT: Re-zoning Housing Middle Road LOCATION: Havelock North JOB No: mn me 6.0 m 0.7m x.5m x.m EXCAV. STARTE: 4//6 EXCAV INISHE: 4//6 (m) SECONARY AN MINOR COMPONENTS CONITION WEATHERING STRENGTH / ENSITY ESTIMATE EECTS, STRUCTURE : Sandy SILT; brown, rootlets. irm, dry. 6.0 Sandy SILT; light grey, rootlets present. irm, dry, trace calcareous clasts. Coarse GRAVELS (greywacke) in sandy silt matrix; light brown. Loose, dry; gravel, rounded. L ALLUVIUM 5.5 Clayey SILT, some fine sand; light brown/grey. irm, dry, low plasticity. [CW Mudstone] KINAPPERS GROUP Silty CLAY; light brown/grey. Stiff, moist, moderate to high plasticity. [Completely Weathered MUSTONE] M St EN O AT.m. T+T_ATATEMPLATE.GT jlb Log Scale :0.8 EXCAVLOG 464.GPJ -Mar-06

32 EXCAVATION No: TP0 Hole Location: 40 Middle Road, middle of paddock between two stream valleys SHEET O PROJECT: Re-zoning Housing Middle Road LOCATION: Havelock North JOB No: mn me 6.0 m 0.7m x.m x.m EXCAV. STARTE: 4//6 EXCAV INISHE: 4//6 (m) SECONARY AN MINOR COMPONENTS CONITION WEATHERING STRENGTH / ENSITY ESTIMATE EECTS, STRUCTURE : Sandy SILT; brown, rootlets. irm, dry. 6.0 Sandy SILT; light brown, rootlets present. irm, dry; sand, fine. [Residual Soil] KINAPPERS GROUP Clayey SILT; brown, trace rootlets. irm, dry. [Completely Weathered SILTSTONE] Clayey SILT; light brown. Very stiff, slightly moist [CW Siltstone]. M VSt EN O AT.m. 5.0 Unable to excavate further T+T_ATATEMPLATE.GT jlb Log Scale :0.8 EXCAVLOG 464.GPJ -Mar-06

33 EXCAVATION No: TP Hole Location: 5 Middle Road SHEET O PROJECT: Re-zoning Housing Middle Road LOCATION: Havelock North JOB No: mn me 5. m 6.0 (m) m x m x.m SECONARY AN MINOR COMPONENTS : Sandy SILT; brown, rootlets. irm, dry. EXCAV. STARTE: 4//6 EXCAV INISHE: 4//6 CONITION WEATHERING STRENGTH / ENSITY ESTIMATE EECTS, STRUCTURE 5.0 -m: Limestone seam. Sandy SILT; light brown, rootlets present. irm, dry; sand, fine. [Residual Soil] KINAPPERS GROUP Sandy SILT, minor clay; light brown. irm, dry. [Completely Weathered SANSTONE] Clayey SILT, with fine sand; light brown. irm, moist. [Completely Weathered SILTSTONE] M Sandy SILT; light brown. Stiff, moist. Silty SAN, minor clay; light brown, speckled light. Very dense, moist [Completely Weathered Sandstone]. St V.0 EN O AT.m. T+T_ATATEMPLATE.GT jlb Log Scale :0.8 EXCAVLOG 464.GPJ -Mar-06

34 EXCAVATION No: TP Hole Location: 9 Middle Road SHEET O PROJECT: Re-zoning Housing Middle Road LOCATION: Havelock North JOB No: mn me.60 m 0.7m x m x.5m EXCAV. STARTE: 4//6 EXCAV INISHE: 4//6 (m) SECONARY AN MINOR COMPONENTS CONITION WEATHERING STRENGTH / ENSITY ESTIMATE EECTS, STRUCTURE.5 : Sandy SILT; brown, rootlets. irm, dry. Sandy SILT, some rounded gravels (greywacke), trace rootlets present; light brown/grey. irm, dry. ALLUVIUM.0 Sandy SILT; brown, mottled orange brown speckled brown/black. Stiff, dry. 0.6m: seam of rounded coarse gravels..0 Clayey SILT, with fine sand; light brown. Stiff, moist. M St Sandy SILT, with some clay, trace rounded cobbles; light brown. Stiff, moist. EN O AT.5m T+T_ATATEMPLATE.GT jlb Log Scale :0.8 EXCAVLOG 464.GPJ -Mar-06

35 Tonkin & Taylor Ltd Housing Re-Zone - Middle Road and Iona Road - Geotechnical Investigation Report Hastings istrict Council April 06 Job No: