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Seamark Placed for Margate Treatment Project
01 Feb 2007
The offshore components of Southern Water’s £80 million wastewater treatment project at Margate UK are nearing completion (see Maritime Journal September 2006).Once completed, 20m litres of dry weather flow wastewater generated daily by 93,000 people in Margate and Broadstairs will be discharged into the sea at Margate following treatment at the Foreness Point and Weatherlees treatment plants.
Main contractors are a consortium of Black and Veatch and Costain, with Cornwall based
Seacore Ltd responsible for the marine side of the project. A new 1.8m diameter storm water discharge pipeline has been tunnelled beneath the seabed, emerging 600m offshore into a pre-dug 13m by 8m by 7m deep pit then upwards to a diffuser with two Tideflex Duckbill valves centred approximately 1.8m above the seabed. The pit was then filled with a grouted granular fill topped with two concrete mattresses wired together and a 200mm concrete topping.
Marking the diffuser was essential, being in a busy area for both commercial and leisure craft.
Anglian Marine Services and Haven Ports Ltd utilising their jack-up barge Haven Seaway, assisted by Felixarc Marine’s multi-cat Gray Mammoth, installed a fixed structure in the form of a steel triangular dolphin with sides approximately 5m in length. The whole structure is around 18m high and comprises three sections connected by conical spurs and sockets in each section. The two lower sections are embedded within the pit with three short lengths emerging from the pit fill to which the main upper section is attached.
The northernmost leg has a double fabricated fender with bump stops protecting a vertical ladder providing access to the maintenance platform and safety cage at the very top of the structure, 6.2m above Ordnance Datum Newlyn and 3.9m above MHWS. Lowestoft based Pelangi International provided the required navigational marks comprising top mark, radar reflector and a solar powered light and battery.
By Peter Barker
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