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Consultant engineer High Point Rendel is involved in three sewerage schemes in southern England, worth around £28 million together.Rendel will design and supervise the construction of two Southern Water projects at Ventnor and Bembridge, Isle of Wight.Tenders for both of these schemes, worth £18 million in total, will be invited early next year.And six firms have put in bids for a £10 million scheme in Lyme Regis, Dorset, with an award expected next month.The Isle of Wight projects, due for completion in 1995, will incorporate treatment works, pumping stations, pipelines and long sea outfalls.Dr Alan Clark, the project director and managing director of Rendel Geotechnics, said of the Ventnor scheme: 'It is in an ancient landslip complex and land stability is a key factor.'The scheme is expected to feature a seafront interceptor sewer and pump station at Collins Point with a pumping main/gravity sewer to headworks at Flowers Brook, and an 800 m long sea outfall.At Bembridge, a pumping main/gravity sewer could run from a pump station at Lane End to headworks at Foreland Field Road, incorporating a 2,300 m long sea outfall.There is also a proposal to include pumping 4 km to an existing treatment works at Sandown.Lyme Regis is another town with landslide movement problems, and Rendel Geotechnics has designed schemes to protect it from coastal erosion and wave attack and to improve the town's sewerage and sewage treatment system.Six firms have tendered for the latter £10 million project. Work includes 1,500 cu m of stormwater sewerage storage tanks, and a 200 m tunnel underneath part of the town.