Desk Study Report Land Off Pound Lane, Semington
Total Page:16
File Type:pdf, Size:1020Kb
DESK STUDY REPORT LAND OFF POUND LANE, SEMINGTON Prepared for: Richborough Estates Limited ASL Report No. 061-16-087-11 April 2016 ASL Holly Farm Business Park Honiley Warwickshire CV8 1NP T: +44(0)1926485508 F: +44(0)1926485507 E: [email protected] W: www.aslenvironmental.co.uk DESK STUDY REPORT LAND OFF POUND LANE, SEMINGTON CONTENTS 1.0 INTRODUCTION.......................................................................................... 3 2.0 THE SITE .................................................................................................... 4 3.0 GEOLOGY .................................................................................................... 6 4.0 HYDROLOGY ............................................................................................... 6 5.0 HYDROGEOLOGY ........................................................................................ 7 6.0 SITE HISTORY ............................................................................................ 8 7.0 STATUTORY DATABASE SEARCH ............................................................... 10 7.1 General .................................................................................................. 10 7.2 Database Search Results .......................................................................... 10 7.3 Environment Agency Search Results ........................................................... 10 7.4 Geological Hazards ................................................................................... 10 7.5 Contemporary Trade References ................................................................ 11 8.0 ASSESSMENT OF CONTAMINATION RISK ................................................. 12 8.1 General .................................................................................................. 12 8.2 On-Site Sources of Contamination .............................................................. 12 8.3 Off-Site Sources of Contamination ............................................................. 12 8.4 Receptors and Pathways ........................................................................... 12 8.5 Potential Pollutant Linkages and Qualitative Risk Assessment ........................ 13 9.0 GEOTECHNICAL CONSIDERATIONS .......................................................... 15 10.0 FURTHER WORK ....................................................................................... 16 11.0 SUMMARY AND RECOMMENDATIONS ....................................................... 17 REFERENCES ...................................................................................................... 18 GENERAL NOTES ................................................................................................. 19 TABLES 1 Summary of Site History FIGURES 1 Site Location 2 Site Layout 3 Conceptual Site Model APPENDICES I Environmental Database Search II Historical Map Extracts ASL Report No. 061-16-087-11 Page No. 2 of 19 April 2016 DESK STUDY REPORT LAND OFF POUND LANE, SEMINGTON 1.0 INTRODUCTION In March 2016, ASL was instructed by Richborough Estates Limited to undertake a desk study of the site known as Land off Pound Lane, Semington. The instruction to proceed with these works was received by email from Richborough Estates Limited dated 16th March 2016. The purpose of this desk study is to determine any potential environmental and geotechnical risk issues and liabilities pertaining to the future development of the site. It is understood the proposed development will comprise a residential end use however there are no proposed development layout plans available at this time. This assessment uses available information on the site and the surrounding area sourced from environmental databases maintained by the Environment Agency (EA), historical ordnance survey maps, a site walkover survey, a review of the site’s environmental setting and an appraisal of the current and former land uses with a view to determining the potential for contamination to be present at the site. This report presents the findings of this assessment together with the factual data sourced during the course of these works which are appended for completeness. It should be noted that this assessment cannot determine the actual levels of contamination present at the site only the potential for contamination to be present. The general notes section should be consulted in relation to the limitations of this report. This report has been prepared for the sole benefit of the Clients, Richborough Estates Limited and their representatives and agents. The report has been written based on the results of data searches and site conditions encountered at the time of the assessment. Future changes in legislation and advances in current best practises or provision of more detailed design proposals will result in this report requiring review and possible further assessment after the date of issue. The general notes section within this report should be noted in relation to the limitations of this assessment. ASL Report No. 061-16-087-11 Page No. 3 of 19 April 2016 2.0 THE SITE The site is located directly to the north of Pound Lane to the west of Semington and can be located approximately by National Grid Reference ST 823 605. A site location plan is presented as Figure 1 of this report. The site comprises an irregularly shaped piece of land covering an area of approximately 5 hectares with maximum dimensions of approximately 270m by 230m with the long axis aligned approximately north to south. The site is sloped gently down to the north with a maximum change in elevation of approximately 7m across the site. The change in elevation is steepest at the southern boundary where the site meets the adjacent Pound Lane roadway. A steep slope up is also present along the northern boundary of the site forming an embankment up to the Kennel and Avon Canal located directly off-site to the north. The embankment is approximately 2m in height at its highest point. The site is divided into three fields comprising a larger field located centrally and in the south and west and two smaller fields in the north-east. The southern boundary between the larger field and the smaller field is formed by a drainage ditch lined by a mature hedgerow with numerous trees. The western boundary is formed by a wooden fence and locally a stone wall. The boundary between the two smaller fields is formed by a wooden fence. The smaller field in the north-eastern corner of the site is roughly rectangular in shape with maximum dimensions of approximately 100m by 80m with the long axis aligned north-west to south-east. This field is used for pastoral farming. There is a small rectangular shed used as a livestock shelter located centrally to the southern boundary of this field constructed with corrugated plastic walls and a sloping corrugated plastic roof. The northern boundary of this field is marked by a metal fence and a number of large mature trees. The eastern boundary is marked by a drainage ditch lined with a mature hedgerow and a number of large mature trees. The western boundary is formed by a wooden fence. There are two access points to this field formed by farm gates in the north-eastern corner and centrally to the western boundary. The smaller field located centrally in the north is roughly rectangular with maximum dimensions of approximately 55m by 85m with the long axis aligned north north-east to south south-west. This field is used for pastoral farming. There is a small stable located in the south-west corner of this field constructed with wooden walls and sloping corrugated plastic roof. There is a triangular manhole cover located in the north-west corner of this field. There are two access points into this field formed by farm gates on the western and eastern boundaries of this field. The large field occupies the remainder of the site and comprises an irregularly shaped piece of land with maximum dimensions of approximately 250m by 255m with the long axis aligned approximately north to south. This field appears to be fallow and comprises an area of undeveloped open space. There is a roughly circular pillbox constructed with concrete walls and a flat roof located in the north-west corner of this field. There is also a circular manhole cover located centrally. Access to this field is via a farm gate located centrally on the southern boundary giving access from Pound Lane. A gap in the hedgerow in the south-western corner of this field gives access to the neighbouring field. There are three sections of powerlines transecting the site in multiple directions. The main section transects the site from the north-west to south-east and terminates in the south- east corner of the largest field. At this termination point a second section is created ASL Report No. 061-16-087-11 Page No. 4 of 19 April 2016 running north-south and bisecting the smaller field in the north-east corner of the site. A final section bisects the western portion of the larger field and runs south-north. This final section converges to the main section running north-west to south-east in the north-west corner of the larger field. The site is bound to the north by the Kennel and Avon Canal with agricultural land beyond, to the east by residential properties, to the south by Pound Lane with residential properties beyond and the west by undeveloped agricultural land. The site layout is presented on Figure 2. It is understood the proposed development will comprise a residential end use however there are no development