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Phase I Desk Study Inglewood, Paignton, Devon

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Phase I Desk Study Inglewood, Paignton, Devon Phase I Desk Study Inglewood, Paignton, Devon WB03590 R1 Deeley Freed Estates MULTIDISCIPLINARY ENGINEERING CONSULTANTS Phase 1 Desk Study Report No. Date. WB03590 R1 2nd October 2017 Project Inglewood, Paignton, Devon Client Name Deeley Freed Estates Limited Issue Date/ Number Status Description of Amendments 12/10/16 Final - May 17 Final - 02/10/17 Final Development proposals updated Report Prepared by: Nick Edwards BSc (Hons) MSc FGS Graduate Geotechnical/Geoenvironmental Engineer Approved for Issue by: André Gilleard SiLC CSci CEnv BEng(Hons) Associate Director GeoEnvironmental Issuing Office The Cocoa House, 129 Cumberland Road, Bristol, BS1 6UY x Tel: +44 (0)117 929 2244 GF Suite, Bickleigh House, Park Five Business Centre, Exeter, EX2 7HU Tel: +44 (0)1392 369098 Unit 17.1, The Leathermarket, 11 -13 Weston Street, London, SE1 3ER Tel: +44(0)20 7939 0959 This report is provided for the benefit of the Client. We do not accept responsibility in the event that the report contents are used in whole or in part by a third party and we exercise no duty of care to any such third party. © Clarkebond (UK) Limited MULTIDISCIPLINARY ENGINEERING CONSULTANTS Phase 1 Desk Study CONTENTS EXECUTIVE SUMMARY ......................................................................................................... i 1.0 INTRODUCTION ............................................................................................................ 1 1.1 Instruction and Brief...................................................................................................................................... 1 1.2 Scope of Works ............................................................................................................................................. 1 1.3 Limitations ..................................................................................................................................................... 1 2.0 PHASE 1 ASSESSMENT ............................................................................................... 2 2.1 Site Location and Description ...................................................................................................................... 2 2.2 Geology .......................................................................................................................................................... 2 2.3 Hydrology and Hydrogeology ...................................................................................................................... 3 2.4 Flood Risk ...................................................................................................................................................... 3 2.5 Site History ..................................................................................................................................................... 3 2.6 Environmental Database ............................................................................................................................... 4 2.7 Previous Investigations ................................................................................................................................ 4 3.0 PRELIMINARY CONCEPTUAL MODEL ........................................................................ 5 4.0 GEOTECHNICAL AND ENVIRONMENTAL CONSIDERATIONS .................................. 8 4.1 Proposed Development................................................................................................................................. 8 4.2 Anticipated Ground Conditions ................................................................................................................... 8 4.3 Engineering Considerations ......................................................................................................................... 8 4.4 Recommendations for Further Investigation .............................................................................................. 9 4.5 Outline Recommendations for Remediation and Risk Reduction ............................................................. 9 FIGURES 2.1 - Site Location Plan APPENDICES A – Photofile B – Historic Maps C – Environmental Data WB03590/R1 Phase 1 Desk Study October 2017 White Rock Urban Extension MULTIDISCIPLINARY ENGINEERING CONSULTANTS Phase 1 Desk Study EXECUTIVE SUMMARY Client Deeley Freed Estates Limited Site and Land east of Waddeton Road, Goodrington, Paignton Location Approximate Grid Reference E288116, N57666. Proposed It is proposed that the site will be developed into housing. Development History of Currently the site comprises fields and has been so throughout its history. The Site and Goodrington area to the north east becomes increasingly developed with housing Surroundings between the 1930s and 1980s. Fields bound the site to the west, and south. Anticipated Superficial: Ground • Head – southwest corner only Conditions Solid: • Saltern Cove Formation – Mudstone, northern half of the site • Brixham Limestone Formation – southern half of the site Hydrology & A small pond exists in the east of the site. The next nearest surface water is >1km Hydrogeology away. The strata under the site are Secondary ‘A’ and Principal Aquifers. The site is not located within a Source Protection Zone. A risk of Superficial Deposits Flooding has been highlighted within 50m of the wider site’s boundary . Geotechnical Foundations – Bedrock is anticipated at shallow depths and should be suitable Considerations for conventional strip or pad foundations. An intrusive site investigation should be completed to confirm the soil profile across the site. Suspended Floor Slabs - Suspended floor slabs are likely to be adopted for conventional housing. Buried Concrete - Special measures for the protection of buried concrete may be required. Testing to establish soil chemistry is required to assess this risk. Site Drainage – Soakaway drainage may be feasible in the Brixham Limestone Formation. Testing will be required to confirm. The presence of solution features close to limestone should not be excluded. Environmental Tanks – The desk study highlights the presence of an unspecified tank on site, Considerations none were noted on the site walkover Radon Gas – Full radon protection measures are required. Ground Gas – May be present close to the backfilled quarry and from underlying limestone deposits Invasive Species – Japanese Knotweed has not been observed on site, a careful watch should be kept, particularly during the spring for any growth. Risk Rating The general geotechnical risk is considered to be low to medium. Caution in this respect arises principally from variable and faulted ground, and the potential for solution features. The general risk of significant chemical contamination is considered low, as it has never previously been developed. Minor residual risks relating to pesticide and herbicide residues from agriculture, and the nearby quarry Site Investigation • Trial pitting with soakaway drainage testing Recommendations • Window sampling including in situ strength testing • CBR testing • Geotechnical laboratory testing that is recommended includes pH and water soluble sulphate. • Contaminated land testing that is recommended that include a general indicator suit, speciated total petroleum and polyaromatic hydrocarbons. WB03590/R1 Phase 1 Desk Study October 2017 White Rock Urban Extension Page i of i MULTIDISCIPLINARY ENGINEERING CONSULTANTS Phase 1 Desk Study 1.0 INTRODUCTION 1.1 Instruction and Brief Clarkebond (UK) Limited was commissioned by Deeley Freed Estates Ltd to undertake a Phase I Desk Study on a site to be known as Inglewood, Paignton, Devon. The development is in outline planning but is to be up to 400 residential dwellings, a two form entry primary school and a public house. 1.2 Scope of Works The objectives of the investigation were to determine the sub-surface conditions in respect of: • Preliminary geotechnical advice relating to the anticipated ground conditions • Preliminary contamination assessment to consider potential significant pollutant linkages arising from the historic land uses on and off site. 1.3 Limitations This report is provided for the benefit only of the party to whom it is addressed and we do not accept responsibility to any third party for the whole or any part of the contents and we exercise no duty of care in relation to this report to any third party. This assessment has been based to a large extent on third party data acquired from Third Parties. This data has been taken at face value and has not been subjected to any third party validation. WB03590/R1 Phase 1 Desk Study October 2017 Inglewood, Paignton, Devon Page 1 of 9 MULTIDISCIPLINARY ENGINEERING CONSULTANTS Phase 1 Desk Study 2.0 PHASE 1 ASSESSMENT 2.1 Site Location and Description The site is located approximately 3.3km to the south west of Paignton. It has a central National Grid Reference E288116, N57666. A site location plan is presented as Figure 2.1. The site was visited on 5th September and the following site description completed. The weather at the time was overcast/sunny. Typical photos of the site are included in Appendix A. • The site is irregular in shape and covers an area of approximately 31.45ha. • The site is currently comprises 6no. large fields used for mixed arable and pastoral farming. • The three central fields are surfaced with short, cattle-grazed, stitched grass. The field to the furthest north is densely planted with mixed sapling trees, which is to form a screening area between this and the
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