Item C1 First Time Sewer Network and Upgrade of Existing Wastewater
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SECTION C MINERALS AND WASTE DISPOSAL Background Documents - the deposited documents, views and representations received as referred to in the reports and included in the development proposals dossier for each case and also as might be additionally indicated. Item C1 First time sewer network and upgrade of existing wastewater treatment works and associated infrastructure for New Romney, Greatstone-on-Sea and Lydd-on-Sea – SH/05/0053 A report by Head of Planning Applications Unit to Planning Applications Committee on 19 July 2005. An application for a first time sewer network to serve individual properties in existing settlements, associated upgrade of existing wastewater treatment works and associated infrastructure to serve the settlements of New Romney, Greatstone-on-Sea and Lydd-on- Sea by Southern Water Plc. Recommendation: subject to completion of a legal agreement Planning Permission BE GRANTED. Local Member: Mr F Wood-Brignall Unrestricted Introduction 1. Members of the Planning Applications Committee visited the area and two sites in particular, The Lade Car Park, Greatstone-On-Sea and Church Road construction compound, New Romney on 31 May 2005. The minutes of that visit are appended to this report (Appendix 1). The Site and Surroundings 2. The planning application area is complex and is probably best understood by reference to the site plans on the following pages. It encompasses most of New Romney, all of Greatstone-on-Sea and Lydd-on-Sea; detailed descriptions of areas where there are particular issues will be given later in the report. C1.1 First time sewer network and upgrade of existing wastewater treatment works and associated infrastructure for New Romney, Greatstone-on-Sea and Lydd-on-Sea – SH/05/0053 3. The land use within the scheme area is predominantly residential with some commercial and retail businesses, the latter located primarily in New Romney. Parts of the proposed first time sewerage (FTS) and some of the pumping stations would be located on the periphery of the built up area, which is bordered by low lying agricultural and pasture land. The landscape is generally open with views across a wide area. To the south of New Romney and west of Greatstone, lies the Denge Marsh. Within this area are a number of designated sites including the Dungeness Candidate Special Area of Conservation (cSAC), Dungeness to Pett Level Special Protection Area (SPA) as well as several Sites of Special Scientific Interest (SSSI’s) and a National Nature Reserve (NNR). 4. The main roads running through the area include the A259, which runs through New Romney and is the main route into the scheme area. The B2071 runs between New Romney and Littlestone-on-Sea, thereafter connecting to the coast road that runs down through Greatstone-on-Sea and on to Lydd-on-Sea. 5. New Romney Wastewater Treatment Works (WTW) itself lies to the east of the Romney Hythe and Dymchurch Railway line south of Littlestone-on-Sea and north of Greatstone-on-Sea and is reached via a dedicated access road off the B2071. The WTW is sited against a backdrop of a wooded tree belt on the edge of open rough grassland that stretches over 6. 500m to the south of the southern edge of housing in Littlestone-on-Sea. It is generally well located within the landscape and shielded from most views they mostly being from a distance. Location Plan 7. I attach the following site plans showing the extent of the scheme in New Romney, Greatstone-on-Sea and Lydd-on-Sea. Large scale versions of these plans will be displayed in the council chamber at committee and the report will be available on the website. C1.2 First time sewer network and upgrade of existing wastewater treatment works and associated infrastructure for New Romney, Greatstone-on-Sea and Lydd-on-Sea – SH/05/0053 New Romney Location Plan C1.3 First time sewer network and upgrade of existing wastewater treatment works and associated infrastructure for New Romney, Greatstone-on-Sea and Lydd-on-Sea – SH/05/0053 Greatstone Location Plan Need for the Scheme 8. The UK water regulator, OFWAT, is responsible for ensuring that water companies carry out their responsibilities under the Water Industry Act 1991. They also have a responsibility to ensure that the Urban Waste Water Treatment Directive (UWWTD) is complied with. Under the UWWTD, member states have until December 2005 to provide first time sewerage to urban areas with a population equivalent threshold of 2000 persons. However, OFWAT has granted a derogation of this obligation to Southern Water until 2007. C1.4 First time sewer network and upgrade of existing wastewater treatment works and associated infrastructure for New Romney, Greatstone-on-Sea and Lydd-on-Sea – SH/05/0053 9. Shepway District Council also requested through Section 101A of the Water Industry Act 1991 that first time sewerage be provided for New Romney. The Applicant has a duty to respond to this. Proposal 10. The application is to provide a First Time Sewerage (FTS) collection system for New Romney, and Greatstone-on-Sea and Lydd-on-Sea (hereafter referred to as Greatstone). The majority of properties in New Romney and all properties in Greatstone currently use either septic tanks or cesspools for wastewater and sewerage collection. 11. The proposed scheme would comprise in total approximately 29km of rising main and gravity sewer with associated infrastructure as well as requiring an upgrade to New Romney WTW. The scheme can effectively be split into three parts, the system proposed for New Romney; the system proposed for Greatstone and the upgrade to the treatment works. I shall now describe the proposal for each part in a little more detail. 12. New Romney FTS would comprise a gravity sewer system with pipelines running beneath the roads. These would feed into a series of pumping stations located around the periphery of the town and providing the necessary pressure to transport sewage east to the existing New Romney WTW. The pumping stations would in most cases be sited on open land immediately adjacent to the peripheral roads. 13. The following are the key elements of the New Romney FTS scheme: • 5950m of sewer constructed in open cut trench; • 600m of rider sewer constructed in open cut trench; • 1340m of sewer constructed by trenchless methods; • 3150m of rising main constructed in open cut trench; and • 5 submersible pumping stations and one storage chamber 14. In addition at four of the five pumping stations a temporary site compound would be required for materials and equipment storage and general site facilities e.g. portacabin offices, toilets, fuelling facilities etc. The compounds would be located immediately adjacent to the pumping station sites. Compounds at pumping stations 1 and 3 would be larger to also serve as main construction compounds for works associated with the laying of the sewers. All compounds would be fenced off and secured to prevent unauthorised access. 15. Greatstone-on-Sea FTS would comprise a vacuum sewer system. As with the New Romney section all pipelines would run beneath the roads, with Coast Drive acting as C1.5 First time sewer network and upgrade of existing wastewater treatment works and associated infrastructure for New Romney, Greatstone-on-Sea and Lydd-on-Sea – SH/05/0053 the main artery. Following negotiations a combined pumping station/public toilet building would be constructed within the existing car park opposite the junction of Coast Drive and Taylor Road with a minor extension to the rear of the car park. From here sewage would be pumped northwards where a connection would be made to the existing sewer system located approximately at the junction of Dunes Road and Alfred Road. 16. The following are the key elements of the Greatstone FTS scheme: • 11,100m of vacuum sewer of sizes 110mm to 200mm diameter • Four vacuum sewer sub catchments discharging to the vacuum station • 518 approx. number vacuum collection chambers with vacuum system valves • 3,600m of 90mm diameter crossover pipe connecting the collection chambers to the vacuum sewers • Vacuum station with 4 vacuum pumps, 1 vacuum/sewage vessel and 2 pumps discharging to Dunes Road pumping station via a 2980 long 200mm diameter rising main 17. Two temporary construction compounds are proposed one adjacent to the existing Dunes Road pumping station and the other on the car park adjacent to the proposed vacuum pumping station on Coast Drive. Both compounds would be fenced off and secured to prevent unauthorised access. 18. New Romney Wastewater Treatment Works upgrade would comprise the following elements: • Replacement or refurbishment of some of the existing assets in order to optimise operational and treatment efficiency; • Provision of two new humus tanks in order to meet surface loading requirements; • More extensive upgrading work in relation to the inlet works, effluent recycle and washwater facilities; • A UV standby facility • One new primary settlement tank • A new plastic media biological filter; • A deep bed rapid granular media filter; • sludge thickening and storage to handle the increase in sludge production, and • extra storm storage (may be needed) 19. A temporary construction compound would be required adjacent to the northern boundary of the site on land owned by Southern Water. It would include contractor site offices, mess facilities, storage, car parking etc. The compound would extend approximately 20m from the existing access gate fence line, northwards, parallel to the access road and cover an area of 10,000m 2. Access into the compound would be C1.6 First time sewer network and upgrade of existing wastewater treatment works and associated infrastructure for New Romney, Greatstone-on-Sea and Lydd-on-Sea – SH/05/0053 via the main WTW access road off Station Road.