Phase I Desk Study, Site Reconnaissance & Phase II Site Investigation Report at Roselands, Seddlescombe Street, Seddlescombe, Kent, TN33 0QQ for Chartway Group Report Reference: LP001170 Report Date: 28th June 2016 LE/QMS/Doc 7/5-1 Issue 5 LP 001170: Roselands, Seddlescombe TABLE OF CONTENTS A INTRODUCTION .............................................................................................................................. 9 1 Authority .......................................................................................................................................... 9 2 Objective .......................................................................................................................................... 9 3 Scope of Works .............................................................................................................................. 9 3.1 Phase 1 Scope ...................................................................................................................... 10 3.2 Intrusive Investigation Scope ........................................................................................... 11 4 Limitations ..................................................................................................................................... 12 B PHASE I – Desk study ..................................................................................................................... 13 5 Environmental Setting ................................................................................................................. 13 5.1 Site Location and Description ......................................................................................... 13 5.2 Geology ................................................................................................................................ 13 5.3 Hydrogeology ...................................................................................................................... 14 5.4 Hydrology ............................................................................................................................. 14 5.5 Flooding ................................................................................................................................ 14 5.6 Designated Environmentally Sensitive Sites ................................................................. 15 5.7 Ground Workings .............................................................................................................. 15 5.8 Mining, Extraction and Natural Cavities ....................................................................... 15 6 Site Usage ...................................................................................................................................... 15 6.1 Current Land Use .............................................................................................................. 16 6.2 Evidence of Onsite Contamination ................................................................................ 16 6.3 Neighbouring Land Use .................................................................................................... 16 6.4 Evidence of Off Site Contamination .............................................................................. 16 6.5 Site History .......................................................................................................................... 16 6.6 Unexploded Ordnance (UXO) ....................................................................................... 17 6.7 Waste Planning and Landfill Records ............................................................................. 18 6.8 Other Regulatory Records .............................................................................................. 18 6.9 Radon .................................................................................................................................... 18 C PRELIMINARY CONCEPTUAL SITE MODEL ......................................................................... 19 7 Environmental Risk Assessment .............................................................................................. 19 7.1 Conceptual Site Model (CSM) ......................................................................................... 19 7.2 Sources ................................................................................................................................. 19 7.3 Receptors ............................................................................................................................. 20 7.4 Pathways and Potential Pollutant Linkages ................................................................... 20 7.5 Qualitative Risk Assessment of Pollutant Linkages .................................................... 20 LE/QMS/Doc 7/5-1 Issue 5 LP 001170: Roselands, Seddlescombe 7.6 Conclusions ......................................................................................................................... 20 8 Geotechnical Risk Assessment ................................................................................................. 21 8.1 Geotechnical Risk Register .............................................................................................. 21 8.2 Conclusions ......................................................................................................................... 21 D PHASE II - Intrusive Investigation ................................................................................................. 22 9 Investigation Rationale ................................................................................................................ 22 10 Site Work ...................................................................................................................................... 22 10.1 Date and Weather Conditions ....................................................................................... 22 10.2 Site Work Methods ........................................................................................................... 22 10.3 Field Tests ............................................................................................................................ 23 10.4 Laboratory Analysis ........................................................................................................... 24 11 Ground Conditions ..................................................................................................................... 25 E GEOTECHNICAL INFORMATION ........................................................................................... 27 12 Strata Encountered ..................................................................................................................... 27 12.1 Made Ground ...................................................................................................................... 27 12.2 Ashdown Formation .......................................................................................................... 27 F GEOTECHNICAL APPRAISAL .................................................................................................... 28 13 Swelling and Shrinkage ............................................................................................................... 28 14 Sulphates ........................................................................................................................................ 29 15 Groundwater ................................................................................................................................ 29 16 Soakage Potential ......................................................................................................................... 29 16.1 Test Results ......................................................................................................................... 29 16.2 Recommendations .............................................................................................................. 30 17 Bearing Capacity and Foundations .......................................................................................... 30 17.1 Shallow Foundations .......................................................................................................... 30 18 Floor Slabs ..................................................................................................................................... 30 19 Roads .............................................................................................................................................. 31 20 Excavations .................................................................................................................................... 31 21 Filling ............................................................................................................................................... 32 22 Settlement ..................................................................................................................................... 32 23 Heave and Uplift .......................................................................................................................... 32 G GEO-ENVIRONMENTAL APPRAISAL ...................................................................................... 34 LE/QMS/Doc 7/5-1 Issue 5 LP 001170: Roselands, Seddlescombe 24 Conceptual Site Model ..............................................................................................................