Appendix B Operating Techiques.Pdf
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The application site is detailed on Drawing Number CEM/A104530/LOC/01. 1.2.2 The site is divided in two by the River Ash which enters the site at the north west under the Upper Halliford Bypass and runs in a south-east direction towards Fordbridge Road. The river then joins the River Thames which is located approximately 400m south at its closest point. 1.2.3 The western boundary is formed by the Gaston Bridge Road (A244), the south by the Fordbridge Road (B375) and the north east by Halliford Road. To the south of the site beyond Forbridge Road is a marina, fishing lake and swan sanctuary. 1.2.4 Residential properties are located to the west, north and south east of the site and the nearest residential property is a detached residential property know as Cuckoo Pound. The property is located along the northern boundary of the western half of the site. Commercial units are located to the south east of the eastern half of the site. 1.3 Geology 1.3.1 The geology of the site and its surrounding area are presented on Drawing Number DESID 9. The maps show that the site is underlain by substantial London Clay deposits, above the Lambeth Group. The Upper Chalk underlies the Tharnet Sand formation, which is stratigraphically separated from it by an unconformity. The site is located near the top of the London Clay and a large thickness (up to 111m) of London Clay can be interpreted to be present below the site. The London Clay is described as a brown to dark grey clay with fine- www.wyg.com creative minds safe hands 1 Watersplash Farm - Operating Techniques grained sands and pebble beds in places. 1.3.2 The younger Claygate Member (fine-grained silty and clayey sand) and Bagshot Formation (fine to medium grained sands with thinly laminated clays and silts in places) are found beneath the superficial deposits to the south and west. 1.3.3 The River Terrace Deposits below the site belong to the Shepperton Gravel Member (first terrace). The Kempton Park Gravels (second terrace), Taplow Gravels (third terrace) and the Langley Silt Member are also present close to the site as shown on Drawing Number DESID 9. 1.3.4 Alluvium (sand, silt and clay associated with the River Ash and River Thames) is also present adjacent to the rivers. 1.3.5 Further details regarding the geology of the site are provided in Environmental Setting and Site Design (ESSD) report (Appendix C of the main application). 1.4 Hydrogeology 1.4.1 With reference to the Environment Agency’s mapping website ‘What’s in my backyard’, the site is not situated within a Groundwater Source Protection Zone (GSPZ). 1.4.2 The Environment Agency’s aquifer maps show that the sand and gravel superficial deposits are classified as a Principal Aquifer which comprise layers of rock or drift deposits that have high intergranular and/or fracture permeability - meaning they usually provide a high level of water storage. 1.4.3 The London Clay bedrock is classified among the “unproductive strata”. These are defined as being generally unable to support abstractions greater than 10m3/d and unlikely to provide significant baseflow or wetland discharges. 1.4.4 The Chalk beneath the London Clay is also classified as a Principal Aquifer. 1.4.5 Further details regarding the hydrogeology of the site are provided in the ESSD report. 1.5 Hydrology 1.5.1 Local surface water features are shown on Drawing Number DESID 11. 1.5.2 The principal surface water feature in the area is the River Thames, which is located about 400 m to the south of the site and flows to the east towards Central London. www.wyg.com creative minds safe hands 2 Watersplash Farm - Operating Techniques 1.5.3 The River Ash, a tributary of the Thames, runs through the site from the north west towards the south east where it joins the River Thames about 400m from the site. 1.5.4 Groundwater level information shows that groundwater flows towards the River Thames, and is likely to provide baseflow to the River Thames and the River Ash. 1.5.5 The area between the site and the River Thames consists of a marina and fisheries which were developed in the lakes formed by historical mineral workings. The marina is fed by the River Thames. 1.5.6 A large number of other open water bodies are located in the wider area, also principally in historical sand and gravel workings. 1.5.7 The Queen Elizabeth II Storage Reservoir, Knight Reservoir, Molesey Reservoirs and Bessborough Reservoir are all located about 1.4km to the south east of the site and the Queen Mary Reservoir is located about 1.5km to the north west. These reservoirs are believed not to be connected to the sand and gravel aquifer.