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Hailsham South WTW Geotechnical and Geo-Environmental Interpretative Report

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Hailsham South WTW Geotechnical and Geo-Environmental Interpretative Report Hailsham South WTW Geotechnical and Geo-environmental Interpretative Report 17/05/2018 Issue 00 MWH Project Code: 41523623 Document No: 41523623/GEO/RP/639176/001 Version Date Description/Amendment Prepared by (Author) Checked by Reviewed by 00 17/05/2017 For Issue G I Davies (Geotechnical) / L Connelly (Geotechnical) / J R Harris (Geotechnical & Geo- F Giacomello (Geo-Env) J Hoy te (Geo-Env) Env) Contents Introduction and Proposed Works ...................................................... 1 Purpose and Objectives of Report .................................... 2 Site Information .................................................................................. 2 Existing Reports ............................................................... 2 Weeks Consulting Limited Investigation (2002) ................ 2 MWH Geotechnical Desk Study (2017) ............................ 2 ESG Limited Ground Investigation (2017) ........................ 2 Site Setting ....................................................................... 2 Historical Land Use .......................................................... 3 Ground Conditions ............................................................ 4 Geology ............................................................................ 4 Hydrogeology ................................................................... 4 Hydrology ......................................................................... 4 Scope of Investigation ........................................................................ 5 Results and Interpretation ................................................................... 5 Ground Conditions ............................................................ 5 Made Ground (surfacing / sub-base) ................................ 7 Made Ground (re-worked Weald Clay) ............................. 7 Alluvium ............................................................................ 7 Weald Clay Formation ...................................................... 7 Geotechnical Testing ........................................................ 7 Made Ground (concrete / sub-base) ................................. 7 Made Ground (re-worked Weald Clay) ............................. 8 Alluvium ............................................................................ 9 Weald Clay Formation .....................................................10 Resistivity Testing ............................................................12 Summary .........................................................................13 Engineering Considerations ...............................................................14 Foundations .....................................................................14 Tertiary Treatment Plant Area .........................................16 Centrifuge Plant Area ......................................................16 Ferric Dosing Plant Area .................................................17 Oxidation Ditch Area ........................................................17 Excavation and ground support .......................................17 Slopes .............................................................................18 i Hailsham South Geotechnical & Geo-environmental WTW Interpretative Report Pipework, Ducting and Chambers ...................................18 Groundwater, Flotation and Dewatering ..........................18 Groundwater Control .......................................................18 Buoyancy and Flotation ...................................................18 Ground Aggressivity / Concrete Design ...........................19 Design of Buried Concrete ..............................................19 Design of Ferrous Pipework ............................................19 Geo-Environmental considerations ....................................................19 Soil Quality Assessment ..................................................20 Scope of Assessment ......................................................20 Soil Screening Results and Recommendations ...............20 Health and Safety ............................................................20 Assessment of Disposal Options for Excavated Materials20 Screening Methodology ...................................................20 Screening Results ...........................................................21 Groundwater Assessment ...............................................21 Ground Gas Assessment ................................................22 Material Suitability for Reuse ...........................................22 Recommendations for Further Work ..................................................23 References ........................................................................................24 Appendices ...............................................................................................26 Appendices 1. Site Layout Drawing and Proposed Works Details 2. Topographic Survey 3. ESGL Factual Report on Ground Investigation 4. Land Quality Screening Results Summary and Atkins CatWaste Soil Hazardous Properties Assessment ii Hailsham South Geotechnical & Geo-environmental WTW Interpretative Report Abbreviations ACEC Aggressive Chemical Environment Class BGS British Geological Survey DI Ductile Iron DS Design Sulphate FE Final Effluent HST Humus Settlement Tank LCP Local Control Panel OS Ordnance Survey PST Primary Settlement Tank SAF Submerged Aerated Filter TPS Total Potential Sulphate WTW Wastewater Treatment Works iii Hailsham South Geotechnical & Geo-environmental WTW Interpretative Report Introduction and Proposed Works Various upgrades to the treatment process plant are proposed at Hailsham South WTW, of which the following new structures are proposed which require geotechnical and geo-environmental input to the design: Tertiary Treatment Plant Area • Four Actiflo AS5 units, each on a 13.90m x 4.05m reinforced concrete base slab of 0.50m thickness with the underside +3.40mOD; the gross ground pressure imposed by each unit is 48.21kPa • MCC, sand storage, mess room, lab for jar testing and poly make-up kiosk, all on a common 13.40m x 10.40m reinforced concrete base slab of 0.40m thickness with the underside at +3.50mOD; the gross ground pressure imposed is 22.88kPa • Tertiary pumping station comprising a 5.05m x 5.96m x 2.45m deep dry well chamber (underside +2.00mOD) and an adjoining 4.02m x 5.76m x 5.01m deep wet well chamber (underside -0.76mOD); the gross ground pressure imposed is 57.52kPa • Phosphate monitoring kiosk, around 3.00m x 3.00m in plan with the underside at +3.86mOD • Final effluent chamber of 8.25m x 3.00m plan dimensions and 3.50m deep with the underside at +1.70mOD; gross ground pressure imposed is 65.37kPa • Welfare building, a 9.80m x 6.40m blockwork structure on twelve foundation pads of 0.60m x 0.60m with the underside at +3.60mOD; the gross ground pressure imposed by the pads is 107kPa • Hardstanding surrounding the tertiary treatment plant Centrifuge Plant Area • Centrifuge structure, on a 11.00m x 9.00m reinforced concrete base slab of 0.30m thickness with the underside at +3.35mOD; the gross ground pressure imposed is 18.03kPa • Two sludge cake vessels, each on a 9.00m x 8.00m reinforced concrete base slab of 0.30m thickness with the underside at +3.33mOD; the gross ground pressure imposed by each vessel is 11.32kPa • Poly make-up plant kiosk and MCC for the centrifuge, on a 8.00m x 4.00m reinforced concrete base slab of 0.30m thickness with the underside at +3.54mOD; the gross ground pressure imposed is 24.88kPa • Road extension for the centrifuge/ cake vessel plant Ferric Dosing Plant Area • 30m3 ferric storage kiosk on a 9.89m x 4.20m reinforced concrete base slab of 0.40m thickness with the underside at +4.03mOD; the gross ground pressure imposed is 34.97kPa • Fuel tank for 800kVA generator (13,000 litres capacity), on a 3.20m x 1.80m reinforced concrete base slab of 0.3m thickness with the underside at +3.95mOD; the gross ground pressure is 34.06kPa. • Switchboard kiosk, on a 7.00m x 3.00m reinforced concrete base slab of 0.30m thickness with the underside at +2.71mOD; the gross ground pressure imposed is 32.04kPa Oxidation Ditch Area • Blowers and ventilation plant, on a 13.00m x 7.00m reinforced concrete base slab of 0.30m thickness with the underside at +3.18mOD; the gross ground pressure imposed is 17.99kPa 1 Hailsham South Geotechnical & Geo-environmental WTW Interpretative Report Inlet Works Area • Screening handling units / cover and skip rail The site layout and details of the proposed works are included in Appendix 1. Purpose and Objectives of Report A ground investigation was carried out in June 2017; this report presents a summary of ground conditions encountered and indicates some of the pertinent geotechnical and geo-environmental issues that need to be addressed as part of the design. Site Information Existing Reports The following reports are relevant to the proposed works: Weeks Consulting Limited Investigation (2002) A ground investigation was carried out by Weeks Consulting Limited in 2002 (WCL, 2002), the investigation comprised a single machine excavated trial pit and a single cable percussion borehole. MWH Geotechnical Desk Study (2017) A desk study specific to the proposed works was carried out (MWH, 2017). The desk study scope included a review of historic OS maps and existing ground investigation data (in particular the Weeks Consulting Limited investigation records) in order to determine the likely ground and groundwater
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