NMC Nomenca Ltd Phase 2 Intrusive Works at Land adjacent to Stoke Lane, Stoke Bardolph, Burton Joyce, Nottingham R17026 Land adjacent to Stoke Lane, Stoke Bardolph, Burton Joyce, Nottingham Phase 2 Intrusive Ground Works Factual Report NMC Nomenca Ltd April 2017 Final Report R17026 By NCC PLACE at 3:27 pm, May 31, 2017 Grange GeoConsulting i NMC Nomenca Ltd Phase 2 Intrusive Works at Land adjacent to Stoke Lane, Stoke Bardolph, Burton Joyce, Nottingham R17026 Issued by: Grange GeoConsulting Limited 43 Winchilsea Avenue Newark on Trent Nottinghamshire NG24 4AD Tel: 07773529385 Client: NMC Nomenca Ltd Project: Land adjacent to Stoke Lane, Stoke Bardolph, Burton Joyce, Nottingham Title: Phase 2 Intrusive Works Factual Report Status: FINAL Date: April 2017 Document Production Record Issue Number: 1 Name Signature Approved Andrew Hare (BSc MSc DIC FGS) Andrew Hare Document Revision Record Issue Date Revision Details number 1 13th April 2017 Original issue Grange GeoConsulting Limited has prepared this report in accordance with the instructions of NMC Nomenca Ltd for their sole and specific use. Any third parties who may use the information contained herein do so at their own risk. Grange GeoConsulting ii NMC Nomenca Ltd Phase 2 Intrusive Works at Land adjacent to Stoke Lane, Stoke Bardolph, Burton Joyce, Nottingham R17026 CONTENTS 1.0 INTRODUCTION ..................................................................................................................... 6 2.0 INTRUSIVE WORKS ............................................................................................................... 8 3.0 LABORATORY TESTING SCOPE ........................................................................................ 11 4.0 CONTAMINATION RISK ASSESSMENT AND LABORATORY TESTING RESULTS ........... 12 5.0 CONCLUSIONS AND RECOMMENDATIONS....................................................................... 15 6.0 REFERENCES ...................................................................................................................... 16 APPENDICES Appendix A DRAWINGS Appendix B INTRUSIVE WORKS PHOTOGRAPHS Appendix C INTRUSIVE WORKS PLAN AND EXPLORATORY LOGS Appendix D GRANGE GEOCONSULTING LIMITED METHODOLOGY Appendix E CONTAMINATION TESTING RESULTS Grange GeoConsulting iii NMC Nomenca Ltd Phase 2 Intrusive Works at Land adjacent to Stoke Lane, Stoke Bardolph, Burton Joyce, Nottingham R17026 EXECUTIVE SUMMARY AND CONCEPTUAL SITE MODEL Purpose of This Phase 2 Intrusive Works Factual Report Report Client NMC Nomenca Ltd Site Land adjacent to Stoke Lane, Stoke Bardolph, Burton Joyce, Nottingham Site Location The site is located on Stoke Lane, which is a narrow country road located immediately to the west of the small village of Stoke Bardolph. The site is located approximately 4km to the east of Nottingham City Centre, within the district of Gelding. The approximate postcode for the site is NG14 5HQ. Current Use & The site forms a grass area adjacent to the existing Stoke Bardolph Sewage Treatment Description Works (STW) septic tank site. The site is owned and operated by Severn Trent Water. It is situated in a rural area with suburban development to the west. It is sited adjacent to arable land and the River Trent, which lies approximately 500m east. SITEINFORMATION SETTING & Development The intrusive works are associated with proposed upgrades to the Severn Trent network on the land adjacent to Stoke Lane. Geology The site is underlain by Superficial Deposits. Overview of The intrusive works comprised one borehole (4.5m below ground level) to obtain Grange Geo information on the ground conditions at the site. A groundwater monitoring piezometer Intrusive Works was installed in this borehole to monitor the depth of the water table. The collection of samples for chemical analysis (soil and water) and in-situ testing was also carried out. Findings of the Made Ground Intrusive Works Reddish brown to dark brown, slightly sandy, slightly gravelly Clay. The gravels were fine to medium sub-angular to rounded quartzite with rare brick. Abundant roots noted in the lower layer of the Made Ground between 0.4m bgl and 0.8m bgl. Alluvium Highly variable, forming four distinct layers. Reddish brown, slightly sandy, slightly gravelly Clay with gravels of fine to medium, sub-rounded quartzite was observed to 1.3m bgl. A thin layer of firm, grey, silty Clay was present from 1.5m bgl. A layer of Peat, 0.3m thick, was then present to 1.8m bgl, followed by soft to firm, grey Clay with decayed rootlets to 2m bgl. INTRUSIVEWORKS Holme Pierrepont Sand and Gravel Member Medium dense, orange to brown gravelly Sand. Gravels of fine to coarse, sub-rounded quartzite. Evidence of contamination No visual or olfactory evidence of contamination was encountered. Groundwater A groundwater strike was recorded at 3m bgl, with the water level rising to 2.2m bgl after 20 minutes. A groundwater monitoring piezometer was installed at 3.3m bgl. Contamination One soil sample was taken from the Made Ground. The testing results have been Testing screened against Grange GeoConsulting Limited GAC screening values (provided in Appendix E) to carry out an assessment of potential risks associated with contamination. The sample did not record any contaminants exceeding the relevant GACs and did not contain asbestos. One groundwater sample was taken following the drilling of the borehole at approximately 2.5m bgl. The risks to groundwater and surface water from contaminants on site have been assessed against the Environment Agency (2006) Remedial Targets CONCLUSIONS ASSESSMENT & ASSESSMENT & Methodology (RTM). Acceptable Water Quality Targets are defined for protection of human health (based on UK Drinking Water Standards) and for the protection of aquatic ecosystems (Environmental Quality Standards). Grange GeoConsulting iv NMC Nomenca Ltd Phase 2 Intrusive Works at Land adjacent to Stoke Lane, Stoke Bardolph, Burton Joyce, Nottingham R17026 The sample of groundwater taken from WS1 during the ground investigation was not found to contain any contaminant concentrations exceeding the Environmental Quality Stands. Three exceedances of the UK drinking water standards were recorded. Conclusions The ground conditions across the site, as proven during the intrusive works, are in general accordance with the published geological literature. Limited thicknesses of Made Ground overlie Superficial Deposits of Alluvium (which contained a thin layer of peat) and the Holme Pierrepont Sand and Gravel Member. The soil sample taken did not record concentrations of contaminants exceeding the relevant GACs and did not contain asbestos. The water sample did not record any contaminant concentrations exceeding the Environmental Quality Stands, although three exceedances of the UK drinking water standards were recorded. Although the highly-elevated concentration of manganese recorded in the groundwater at the site is not considered to be a risk to the proposed Severn Trent upgrade works, it is recommended that consideration is given to the investigation of elevated manganese concentrations in the vicinity of the STW, by Severn Trent Water. There is not considered to be a risk from contamination at the site. It is recommended that appropriate Health & Safety precautions, dust control and PPE are adopted during any future earthworks on site. Good practice should always be adopted. This Executive Summary forms part of Grange GeoConsulting Limited report number R17026/001 (Issue 1) and should not be used as a separate document. Grange GeoConsulting v NMC Nomenca Ltd Phase 2 Intrusive Works at Land adjacent to Stoke Lane, Stoke Bardolph, Burton Joyce, Nottingham R17026 1.0 INTRODUCTION 1.1 Terms of Reference Grange GeoConsulting Limited was commissioned by NMC Nomenca Ltd to undertake intrusive works, associated with proposed upgrades to the Severn Trent network, on the land adjacent to Stoke Lane. One borehole (WS1) was advanced to obtain information on the ground conditions to support proposed Severn Trent network upgrade works. The borehole was located within a grass area, adjacent to the existing Stoke Bardolph Sewage Treatment Works (STW) septic tank site. The site is owned and operated by Severn Trent Water. The STW serves most of the Nottingham catchment (roughly 650,000 inhabitants) and treats trade waste from a local livestock rendering plant. This report summarises the findings of the intrusive works carried out in March 2017 by Grange GeoConsulting Limited and the laboratory testing undertaken. Authorisation to proceed with this Factual Report was given by NMC Nomenca Ltd via email. The site is located on Stoke Lane, which is a narrow country road, located immediately to the west of the small village of Stoke Bardolph. Residential properties with gardens are present to the south-west, but do not overlook the site. The site is located approximately 4km to the east of Nottingham City Centre, within the district of Gelding. The site is situated in a rural area with suburban development to the west. It is sited adjacent to arable land and the River Trent, which lies approximately 500m to the east. The approximate postcode for the site is NG14 5HQ. A Site Location Plan (Drawing R17026_DWG1) is presented in Appendix A. 1.2 Objectives The objective of the intrusive works was to characterize the underlying ground conditions and assess the environmental quality of the soils and their potential to adversely impact on human health and the wider environment. This included an assessment of the level of contamination