Lackabeg, Kildavin, Co Carlow

Site Investigation Report

Prepared by Thomas Campbell Consulting Engineers Limited

part of the

Client: Carlow County Council Date: 07/09/20 Project Title: Proposed Development at Lackabeg, Kildavin Document No: 2020-081-CC-1-100 Title of Document: Site Investigation Report – Trial pit Issue: Rev 0

DOCUMENT CONTROL SHEET

Document: Site Investigation

Client: Carlow County Council

Project Title: Development at Lackabeg, Kildavin, Co Carlow

Document No: 2020-081-CC-1-101

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Table of Contents 1.0 INTRODUCTION ...... 4 2.0 SITE LOCATION ...... 4 3.0 SITE CONTOURS ...... 5 4.0 TRIAL PIT LOCATION ...... 6 5.0 SITE INVESTIGATION PROCEDURE ...... 7 6.0 SITE INVESTIGATION RECORDED INFORMATION ...... 7 7.0 SUMMARY ...... 14 8.0 APPENDIX NO 1 ...... 15 9.0 APPENDIX NO 2 ...... 16

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1.0 INTRODUCTION Thomas Campbell Consulting Engineers Limited were requested to complete site investigation works at Lackabeg, Kildavin Co County Carlow. The purpose of the site investigation works, is to classify the underlying geological conditions and determine the most appropriate foundation design.

The site is located in a triangular parcel of land. The site is bordered by the R724 on the Southern Boundary, the N80 on the East and Northern boundary and a local access road on the Western boundary

The site investigation works were completed on Friday the 13/08/2019. This report includes all information recorded as part of the works and recommendation for the most appropriate foundation design

2.0 SITE LOCATION The site is located on the R724 Kildavin to Myshall road. Access is via the R724 The boundary of the site is highlighted in Red below.

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3.0 SITE CONTOURS The site contours vary from 54.444mOD on the south elevation of the site to 56.803mOD on the northern elevation of the site. The proposed site changes significantly (2.36m over 29m) in level from the front to the rear of the site.

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Client: Carlow County Council Date: 07/09/20 Project Title: Proposed Development at Lackagbeg Kildavin Document No: 2020-081-CC-100 Title of Document: Site Investigation Report – Trial pit Issue: Rev 0

4.0 TRIAL PIT LOCATION It was proposed to complete four trial pits across the site to get an indication of the underlying geology. Sit investigation works included the following • Trial Trench A – at the proposed location of house no 1(plot no 1 and driveway) • Trial Trench B – at the proposed location of house no 2 and no 3 (plot no 2 and plot no 3) • Trial Trench C - at the location of the rear retaining wall (boundary with public playground) • Trial Trench D – at the location of the retaining wall (immediately to the rear of the proposed properties).

Please see attached appendix no 1 for locations of trial holes

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5.0 SITE INVESTIGATION PROCEDURE The field work was carried out in accordance with BD5930 (2015): Code of Practice for Site Investigations. The trial pits were excavated with a 3CX excavator, which is the equivalent excavation force of a 6-8ton 360-degree excavator. All trial pits were excavated to 2m below ground level approximately. The excavation of the trial pits was monitored and the change in underlying strata layers was identified and recorded. The excavated material stock pile was also examined and classified.

6.0 SITE INVESTIGATION RECORDED INFORMATION Trench A • Existing ground level – 55.185 • Finished Floor level - 54.40 • Proposed top of Foundation – 53.185 • Depth of excavation – 2.0m (dug to 2m)

Trial trench A was excavated to 2.0m below ground level. Upper Strata layers of coarse soil start to turn to rock type geology at 2.0m below ground level. Underlying geology in the upper layers of Coarse soils, slightly sandy, sand – principal soil type, very dense,

No water present in the excavation. Trench is stable

Trial Trench A

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Trench B • Existing ground level – 54.440 • Finished Floor level - 54.400 • Proposed top of Foundation – 53.400 • Depth of excavation – 1.0m • Actual depth – 1.7m

Infront of Plot 1&2 Trial trench B was excavated to 1.7m below ground level. Upper Strata layers of coarse soil start to turn to rock type geology at 1.7m below ground level rising sharply to ground level at the location of Plot no 2. Underlying geology in the upper layers of Coarse soils, slightly sandy, sand – principal soil type, very dense,

No water present in the excavation. Trench is stable

Trial Trench B

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Infront of Plot 3 Rock present immediately at surface

No water present in the excavation. Trench is stable

Trial Trench B

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Trench C • Existing ground level – 56.533 (average) • Proposed Finished Garden level - 55.300 • Proposed top of Foundation for RC wall – 52.900

Trial trench C was excavated to 0.5m below ground level. Rock is present at 0.5m below ground level No water present in the excavation. Trench is stable

Trial Trench C

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Trench D • Existing ground level – 56.533 (average) • Proposed Finished Garden level - 55.300

Trial trench D was excavated to 0.5m below ground level. A section of trench D for a distance of 3m (at the rear of plot no 1) had no rock present at a depth of 2.0m below ground level.

Rock is present at 0.5m below ground level No water present in the excavation. Trench is stable

Trial Trench D

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7.0 SUMMARY

Units 01 / Plot 1 The trail pits completed along the eastern side of the site, namely trial trench A contain organic matter (topsoil) to a depth of 0.4m. This overlays a mixed stratum of coarse soils which are very dense. The coarse soils/dense material extends to the bottom of the trial pit at 2m below ground level, where rock is encountered

The underlying strata is suitable to bear point loads generated by a strip footing. The most appropriate foundation design for units 01 is as follows; • Removal of the 0.4m of organic matter (topsoil) • Excavation of dense, coarse soils to required formation level • Construction of strip footing foundation (1200mm in width, 400mm in depth, with a layer of A393 mesh).

Units 02 & 03 / Plot 2&3 The trail pits completed along the northern and eastern side of the site; namely trial trench B contain organic matter (topsoil) ranging in depth of 0.1 to 0.4m. This overlays a mixed stratum of coarse soils which are very dense, ranging in depth from 0.4m to 1.7m at which point rock is present.

Please refer to appendix no 2 for further details on expected locations of rock on site.

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8.0 APPENDIX NO 1

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9.0 APPENDIX NO 2

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