Pre-tender Design DSD. Stonecutter Island. Hong Kong. To improve the water quality of the Victoria Harbour, the Harbour Area Treatment Scheme (HATS), formerly known as the Strategic Sewage Disposal Scheme (SSDS), was committed to be implemented in stages to provide treatment for the sewage collected from the urban areas on both sides of the Harbour. It is currently developing the Phase 2A whose main targets are the upgrading of eight existing preliminary treatment works on Hong Kong Island and the upgrading of the existing Stonecutters Island Sewage Treatment Works from the present design treatment capacity of 1.7 million cubic meters per day to cater for the ultimate development scenario of the whole of HATS catchment.

1. Licitación DSD. Colector Isla Stonecutter. Hong Kong
Pre-tender Design DSD. Stonecutter Island. Hong Kong
Para mejorar la calidad de las aguas de Victoria Harbour, el Harbour Area Treatment Scheme (HATS), también nombrado como “Plan estratégico de eliminación de aguas residuales” (SSDS), se ha
comprometido a proporcionar tratamiento para las aguas residuales provenientes de las áreas urbanas en ambos márgenes del puerto. Actualmente se está desarrollando la Fase 2A cuyos principales
objetivos son la mejora de las ocho obras existentes de tratamiento preliminar en la Isla de Hong Kong y la mejora de la depuración de aguas residuales existente desde la capacidad de tratamiento actual
de 1,7 millones de metros cúbicos por día hasta la capacidad de tratamiento correspondiente al completo desarrollo del SSDS.
El proyecto implica la construcción de un túnel de conducción de las aguas desde las plantas de tratamiento de Stonecutter Island hasta el emisario submarino. Este túnel se excavará mediante el método
de perforación y voladura. Tendrá aproximadamente 880 m de longitud, 8,5 m de diámetro interior y conecta con un pozo de 80 m de profundidad en cada extremo.
La geología de la alineación del túnel y de los pozos se encuentra compuesta por granitos pertenecientes a la Lion Rock Suite (Periodo Jurásico o Cretácico). El lecho de roca es generalmente de grano
medio a grueso, con espaciamiento medio y apertura cerrada. Por lo general, a la cota del eje del túnel se encuentran granitos moderadamente descompuestos o de calidad superior. Los depósitos
superficiales, cuyo espesor varía entre 15,0 y 25,0 metros, consisten principalmente en rellenos antrópicos, suelos aluviales y suelos marinos.
To improve the water quality of the Victoria Harbour, the Harbour Area Treatment
Scheme (HATS), formerly known as the Strategic Sewage Disposal Scheme
(SSDS), was committed to be implemented in stages to provide treatment for
the sewage collected from the urban areas on both sides of the Harbour. It is
currently developing the Phase 2Awhose main targets are the upgrading of eight
existing preliminary treatment works on Hong Kong Island and the upgrading
of the existing Stonecutters Island Sewage Treatment Works from the present
design treatment capacity of 1.7 million cubic meters per day to cater for the
ultimate development scenario of the whole of HATS catchment.
An Effluent Tunnel is proposed to convey the effluent from upgraded treatment
facilities on Stonecutter Island to the outfall. This tunnel will be excavated by drill
and blast method. It is approximately 880 m long, 8.5 m in inside diameter and
has a 80 m deep shaft at each end.
The alignment geology of the tunnel and the shafts is composed by granite of
the Lion Rock Suite (Jurassic or Cretaceous in age). The bedrock is generally
medium to coarse grained with medium spaced and tight to extremely narrow
joints. Generally, moderately decomposed or better granite will be encountered
at the tunnel level. Superficial deposits mainly comprise reclaimed fill, alluvium
and marine deposits and its thickness varies between 15,0 and 25,0 meters.
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