Shawfair Park Site, Danderhall
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SHAWFAIR PARK SITE, DANDERHALL REPORT ON SITE INVESTIGATIONS DATE AUGUST 2019 CLIENT SHAWFAIR LLP www.masonevans.co.uk SHAWFAIR LLP SHAWFAIR PARK SITE, DANDERHALL REPORT ON SITE INVESTIGATIONS Date of Issue: August 2019 Report Status: First Edition Project Reference: P19/216 Prepared by: Lindsay Reid – Project GeoScientist Reviewed and Approved by: Niall Lawless – Managing Director Mason Evans Partnership Limited The Piazza 95 Morrison Street GLASGOW G5 8BE www.masonevans.co.uk Shawfair Park Site, Danderhall August 2019 C O N T E N T S PAGE NO EXECUTIVE SUMMARY 1.0 INTRODUCTION 1 1.1 Commission 1 1.2 Investigation Proposals 1 1.3 Limitations 1 2.0 SUMMARY OF DESK STUDY INFORMATION 4 2.1 The Site 4 2.2 Site History 5 2.3 Published Geological Information 6 2.4 Preliminary Conceptual Site Model 9 2.5 Receptor Characterisation 9 2.6 Source Characterisation 9 2.7 Pathway Characterisation (Pollutant Linkages) 10 3.0 SITE INVESTIGATIONS 14 3.1 Objectives 14 3.2 Scope and Methods of Investigations 14 3.3 Summary of Ground Investigation Data 15 3.4 Investigation Rationale 16 3.5 Analytical Procedures 19 4.0 INVESTIGATION RESULTS 20 4.1 Ground Conditions 20 4.2 Groundwater 22 4.3 Visual/Olfactory Evidence of Contamination 24 5.0 CONTAMINATION RISK ASSESSMENT 25 5.1 Human Health and Groundwater Risk Assessment Screening Criteria 25 5.2 Statistical Analysis of Data 25 5.3 Ground Gas Assessment 26 5.4 Building Materials Assessment 26 Mason Evans Partnership Limited Shawfair Park Site, Danderhall August 2019 6.0 HUMAN HEALTH RISK ASSESSMENT 27 6.1 Contaminants in Soils 27 6.2 Herbicide/Pesticide Screen 28 7.0 WATER ENVIRONMENT RISK ASSESSMENT 29 7.1 Water Environment Vulnerability 29 7.2 Surface Water Assessment 29 7.3 Conclusions 32 8.0 GROUND GAS EMISSIONS 33 8.1 General 33 8.2 Ground Gas – Results 33 8.3 Ground Gas – Assessment 33 8.4 Radon 39 8.5 Conclusions 39 9.0 RISKS TO CONSTRUCTED DEVELOPMENT 40 9.1 Sulphate Attack on Construction Materials 40 9.2 Water Supply Pipes 40 9.3 Phytotoxicity 42 10.0 REVISED CONCEPTUAL SITE MODEL 43 10.1 Contamination Sources 43 10.2 Pollutant Linkage Assessment 43 10.3 Mitigation Measures 43 10.4 Waste Management Legislations 45 10.5 Contingent Liabilities 46 11.0 GEOTECHNICAL ASSESSMENT 47 11.1 General 47 11.2 Topsoil 47 11.3 Made Ground 47 11.4 Glacial Soils (granular) 47 11.5 Glacial Soils (cohesive) 47 11.6 Glacial Till 48 11.7 Particle Size Distribution Testing (PSD’s) 48 11.8 Potential Re-Use Potential of On-Site Materials in Earthworks 48 11.9 Rockhead 49 Mason Evans Partnership Limited Shawfair Park Site, Danderhall August 2019 12.0 FOUNDATION RECOMMENDATIONS 50 12.1 Details of the Development 50 12.2 Foundations (relative to existing site levels) 50 12.3 Excavations 50 13.0 MINING AND MINE ENTRIES 51 13.1 General 51 13.2 Mining Methods 51 13.3 Mining Conditions 52 13.4 General Principles of Surface Instability 53 13.5 Surface Instability Due to Mining 54 13.6 Potential for Future Mineral Extraction 54 13.7 Mine Entries 54 13.8 Quarrying 54 14.0 ROAD CONSTRUCTION 55 14.1 General 55 14.2 Ground Conditions 55 14.3 Chemical Contamination 55 14.4 Gas Emissions 55 14.5 Mining and Mineral Stability 55 15.0 INVASIVE SPECIES 56 15.1 General 56 15.2 Results 56 16.0 CONCLUSIONS AND RECOMMENDATIONS 57 16.1 General 57 16.2 Contamination and Gas Emissions 57 16.3 The Built Environment 57 16.4 Foundation Recommendations (relative to existing site levels) 58 16.5 Mining 58 16.6 Invasive Plants 58 16.7 Consultations with Public Authorities 58 Mason Evans Partnership Limited Shawfair Park Site, Danderhall August 2019 L I S T O F D R A W I N G S PAGE NO Drawing No P19/216/SI/R/F/01 Site Location Plan 2 Drawing No P19/216/SI/R/F/02 Study Area 3 Drawing No P19/216/SI/R/F/03 Extract from Published Geological Survey Map (Drift and Solid) 7 Drawing No P19/216/SI/R/F/04 Preliminary Conceptual Site Model 12 Drawing No P19/216/SI/R/F/05 Location of Exploratory Holes 17 Drawing No P19/216/SI/R/F/06 Recorded Made Ground Thickness 21 Drawing No P19/216/SI/R/F/07 Recorded Depth to Definite Rockhead 23 Drawing No P19/216/SI/R/F/08 Ground Gas Emissions Survey 34 Drawing No P19/216/SI/R/F/09 Revised Conceptual Site Model 44 L I S T O F A P P E N D I C E S Appendix 1 Site Walkover Survey (June 2019) Appendix 2 Envirocheck Report Appendix 3 SEPA Databases Appendix 4 The Coal Authority Report Appendix 5 BGS Borehole Scans Appendix 6 Mine Abandonment Plants Appendix 7 Records of Exploratory Holes Appendix 8 Sampling Strategy and Analysis Rationale Appendix 9 Gas and Groundwater Monitoring Results Appendix 10 Chemical Laboratory Analysis Results Appendix 11 Metal Bioavailability Assessment Tool (M-BAT) and Lead Screening Tool Appendix 12 RTM Groundwater Modelling Worksheets Appendix 13 Waste Classification Report (HazWaste Online, July 2019) Appendix 14 Geotechnical Laboratory Analysis Results Appendix 15 Kleerkut Limited Invasive Plant Survey (June 2019) Mason Evans Partnership Limited Shawfair Park Site, Danderhall August 2019 EXECUTIVE SUMMARY Client SHAWFAIR LLP Site Shawfair Park Site, Danderhall Project Objectives . To investigate the possible presence of ground contamination and any potential associated risks. To investigate the ground conditions and provide recommendations on foundation and infrastructure design. To provide recommendations (if any) for additional works/remediation required. Assessment of Risks No significant contamination source was identified at the site, and no significant risks to site to Human Health & users, construction personnel, vegetation or the Water Environment were identified. the Water Consequently, no remedial measures are considered necessary at the site. Environment Waste Acceptance Criteria (WAC) testing was undertaken on a selection of made ground samples obtained from across the proposed development site. Our interpretation of the WAC results, together with chemical analyses, indicate that the made ground soils may be classified as ‘inert waste’ if required to go to landfill. However, should soils be required to be removed from site to a landfill cell, we would recommend that the Waste Classification Report and the soil analyses sheets be presented to the accepting landfill operator to allow them to carry out their own assessment and classification of the materials. Assessment of the UKWIR testing indicates that polyethylene (PE) water supply pipework should be suitable for Built Environment use within the proposed development. However, this will require to be confirmed by Scottish Water. Recommended concrete (ACEC) Classification for the site is AC-1s with a Design Sulphate Class of DS-1. Assessment of Based on the results of the gas monitoring undertaken to date, gas protection measures, Ground Gas corresponding to a ‘Characteristic Situation 2’, will be required within the proposed development due to the presence of elevated carbon dioxide within the shallow soils. Confirmatory monitoring is continuing at the site and the results will be reported as an addendum to this report upon completion. Foundation Given the generally variable of the soils at the site, it is concluded that abnormal foundations will Construction be required, assuming that site levels will generally be maintained. The most appropriate foundation option is considered likely to be vibro-compaction. However, the suitability of the soils for vibro-compaction would require to be confirmed by specialist contractors and it is possible that they may require further investigation to enable them to view the soils in-situ. If confirmed to be appropriate, vibro-compaction should be able to provide a uniform foundation layer for suitably reinforced shallow foundations designed to an allowable bearing capacity of 100 kPa to 125 kPa. If a greater bearing capacity is required, piling to the underlying competent rock strata, utilising end-bearing piles, should be considered. The underlying rock strata, which was encountered at varying depths of between 6.50 m and 7.80 m, should provide a presumed bearing value of greater than 500 kPa. Mining Mining instability is not considered a potential constraint to development. Mason Evans Partnership Limited Shawfair Park Site, Danderhall August 2019 EXECUTIVE SUMMARY - CONT Radon Radon protection measures are not considered necessary within the proposed development given that the site is located within a Lower Probability Radon Area (less than 1% of homes are estimated to be at or above the Action Level). Invasive Plants Horsetail was identified within the western site area. As such, we would recommend that specialist advice be sought on this matter to ensure that an Invasive Weeds Management Plan/Management Strategy is put in place as soon as possible in order to manage risk and reduce the possibility of spread. Mason Evans Partnership Limited Shawfair Park Site, Danderhall August 2019 1.0 INTRODUCTION 1.1 Commission 1.1.1 Mason Evans (ME) were commissioned by Shawfair LLP (the Client), to undertake ground investigations at a site known as ‘Shawfair Park Site’, Danderhall, in connection with the proposed development of the site (Drawing Nos. P19/216/SI/R/F/01 and 02). The proposed development layout was not available at the time of reporting but was understood to be for a commercial development. 1.2 Investigation Proposals 1.2.1 The investigation proposals were outlined in our correspondence to the Client, dated June 2019. The intention of the investigation was to provide further information on the following: . Soil profile beneath proposed development areas of the site .