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Geoenvironmental Appraisal

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Geoenvironmental Appraisal Geoenvironmental Appraisal Land at Preston Road, Hull For Keepmoat Homes Yorkshire East & Strata Homes Report no: 3039/1 Date: January 2019 Tel: 01937 545330 • [email protected] • www.lithos.co.uk SUMMARY OF GEOENVIRONMENTAL ISSUES Job No. 3039 Site area/ha 16 hectares Client: Keepmoat Homes Yorkshire East & Strata Homes NGR: TA 135 302 Site: Preston Road, Hull Nearest postcode: HU9 5UN The site is located approximately 4km east of Hull city centre comprises part of the Preston Road Housing Estate. Prior to the ongoing demolition programme there were about 500 houses (256 pairs of semi-detached, 2-storey properties); about 50% of buildings across the site had been demolished; about 50% were vacant but remained standing; and about 1% remained occupied. Existing (and recently demolished) houses built in the 1930s were constructed on shallow (c. 0.5m deep) strip footings, and no obvious signs of structural distress were noted during the walkover. Lithos were commissioned to provide a geoenvironmental appraisal of the site, which it is understood is to be redeveloped with residential dwellings. Lithos’ investigation included a review of the site's history and environmental setting, and a ground investigation comprising 79 trial pits, 10 deep cable percussion boreholes and 40 road cores with dynamic sample follow-on. A summary of salient geoenvironmental issues is provided in the table below. Issue Remarks The site can be divided into three areas based on ground conditions – Area A (housing recently Areas cleared), Area B (houses remain) and Area C (existing estate roads). A veneer of Demolition Arisings or Made Ground Topsoil to depths of up to 1.1m, but typically c. 0.7m Made ground across areas of demolished land & in the gardens of the remaining houses. Comprises Tidal Flat Deposits which are typically of medium to high strength to depths of c. 1m becoming low to extremely low strength with depth. Natural ground High strength Cohesive Glacial Deposits (Till) are present from c. 7m and extend to depths in excess of 20m. Made Ground across the majority of Areas A and & B is considered suitable to remain in gardens beneath a nominal clean cover of 300mm. Cohesive Made Ground was only encountered 3 of the 89 exploratory holes excavated across the entire site, and significant contamination was only reported in one of these - TP45 (Area A). Cohesive Contamination Made Ground in the vicinity of TP45 is considered contaminated and should be isolated beneath hardstand/floor slabs/highways, or beneath a clean cover of 1,000mm. Ash and & Clinker from beneath Area C (existing roads) should be suitable for isolation beneath hardstand/floor slabs/highways. Mining & The site lies beyond the CA defined coalfields. quarrying No known quarrying has occurred within 250m of the site’s boundary. No significant sources of hazardous gas have been identified and the site lies in an area where less than 1% of properties are above the radon action level. Hazardous gas However, thin beds (maximum thickness of 200mm) of pseudo-fibrous Peat were encountered in 2 of the 10 boreholes at the base of the Tidal Flat Deposits (around 6.5m). Consequently, whilst risks are considered very low, gas monitoring is now being undertaken. Preparatory Demolition of the remaining houses (ongoing) & grubbing up of roads (where they are not being works retained). Lithos have given ‘high level’ consideration to the possibility of a shallow founding solution, but the presence of made ground, high shrinkability clays, (felled) trees, and current-day building regulation / warranty requirements would all require a minimum founding depth of at least 1.0m, and this results in Foundations founding towards (in some places, likely below) the base of the desiccated (high strength) layer. Assuming a founding depth of 1.0m, preliminary calculations suggest that line loads would need to be less than about 20kN/m run. Consequently, at this stage a shallow founding solution is considered unlikely to be viable here and piles will almost certainly be required. Groundwater Excavations should remain dry & stable in the short term; although some relatively minor seepages & excavations might be encountered in shallow soils. Flooding & Soakaways will not provide a suitable means of surface water disposal. drainage The site lies in a Flood Zone 3, but benefits from flood defences. Existing highways typically comprise a 40mm surface course, over a base course 150mm, over Sub-Base Highways (comprising chalk and/or brick), over Ash & Clinker. The total road construction varies from c. 300mm to 600mm depth. Significant developer abnormals relating to geoenvironmental issues at the site are: • Piled foundations • Likely need for surface water balancing This brief summary should not be assumed to represent a complete account of all the potential geo-environmental issues that may exist at the site. As such it is strongly recommended that the report be read in its entirety. CONTENTS 1 INTRODUCTION ............................................................................................................ 1 1.1 THE COMMISSION AND BRIEF......................................................................................................................... 1 1.2 THE PROPOSED DEVELOPMENT ...................................................................................................................... 1 1.3 REPORT FORMAT AND LIMITATIONS ................................................................................................................ 1 2 SITE DESCRIPTION ......................................................................................................... 2 2.1 GENERAL .................................................................................................................................................... 2 2.2 SITE FEATURES .............................................................................................................................................. 2 2.3 SITE OPERATIONS .......................................................................................................................................... 3 3 SITE HISTORY ................................................................................................................. 4 4 ENVIRONMENTAL SETTING ........................................................................................... 6 4.1 GENERAL .................................................................................................................................................... 6 4.2 GROUND STABILITY ...................................................................................................................................... 7 4.3 UXO .......................................................................................................................................................... 7 5 GROUND INVESTIGATION DESIGN .............................................................................. 8 5.1 ANTICIPATED GROUND CONDITIONS & POTENTIAL ISSUES ................................................................................ 8 5.2 PRELIMINARY CONCEPTUAL SITE MODEL......................................................................................................... 8 5.3 GROUND INVESTIGATION DESIGN & STRATEGY ............................................................................................... 9 6 FIELDWORK ................................................................................................................. 10 6.1 OBJECTIVES ............................................................................................................................................... 10 6.2 EXPLORATORY HOLE LOCATION CONSTRAINTS ............................................................................................. 10 6.3 SCOPE OF WORKS...................................................................................................................................... 10 7 GROUND CONDITIONS .............................................................................................. 11 7.1 GENERAL .................................................................................................................................................. 11 7.2 MADE GROUND ........................................................................................................................................ 11 7.3 OBSTRUCTIONS .......................................................................................................................................... 13 7.4 ROADS (AREA C) ..................................................................................................................................... 14 7.5 NATURAL GROUND .................................................................................................................................... 15 7.6 VISUAL & OLFACTORY EVIDENCE OF ORGANIC CONTAMINATION ................................................................. 16 7.7 GROUNDWATER ........................................................................................................................................ 16 7.8 STABILITY ................................................................................................................................................... 17 7.9 REVISED CONCEPTUAL GROUND MODEL (GROUND CONDITIONS) ................................................................. 17 8 CONTAMINATION (ANALYSIS) .................................................................................
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