G.F. 73A
From C.U.C.
717
S.D. 482/49.
Demo
118
To
Hon. D.P.W.
Date: 12th July, 1951.
181
Proposed Compost Factory at Tsun Wan.
PD) in 23/641/50 I atte
(90)
The plan attached to your memorandum PWD 7121/51 of 16th June to Hon. C. S. copied to me shows four dolphins on the 700 feet of sea frontage which it is proposed to utilise for the compost factory and only makes provision for two 98 foot refuse barges to discharge simultaneously. In addition to garbage it will be necessary to discharge nightsoil at the seawall for use in the factory and the present proposals are that the nightsoil should be conveyed in liquid form in covered steel tankers from which the nightsoil will be pumped into the factory. I understand from Director of Marine that it will be possible to convert the existing 78 foot steel nightsoil barges for this purpose. I have no information as to the proposed layout of the factory but it seems certain that it will be necessary to make separate provision on the sea wall for the unloading of nightsoil and refuse. The purpose of this memorandum is to ask your advice on the planning of the berthing facilities. When we know the maximum number of vessels for which simultaneous berthing facilities can be provided, it will be possible in the light of our towing schedule to determine the rate at which the cranes and pumps on the sea wall must be capable of unloading each refuse and nightsoil barge.
2.
It is not possible to make an exact forecase because there may be changes in the number and sitting of our refuse and nightsoil barge stations but I attach for your information a copy of an estimated schedule prepared by the Chief Inspector in charge of Sanitation together with a covering minute written at my request. From this it appears that it will be necessary to make provision for six 100 ton refuse barges to be unloaded daily between 9 a.m. and 1.45 p.m. and one 100 ton barge to be unloaded between 1.45 p.m. and 4 p.m. At the same time it will be necessary for three nightsoil barges to be discharged between 10.25 a.m. and 1.45 p.m. and another three between 1.45 p.m. and 6 p.m.
It also appears that between 10.45 a.m. and 1.30 p.m. nine vessels will be off Tsun Wan simultaneously. From 10.45 a.m. to 12.30 p.m. there will be six refuse barges and three nightsoil barges and from 12.30 p.m. to 1.30 p.m. six nightsoil barges and three refuse barges.
3
It is not known whether it will be possible for two or more vessels to be discharged whilst lying alongside each other at a single berth but it seems probable that the beam of the refuse barges will make it impossible to do more than unload the vessel lying immediately alongside, although the same problem may not arise with the nightsoil barges. It also seems probable that it will be necessary to station a tug all day at the sea wall to shift barges between offshore moorings and the various discharge berths.
4. It will of course be necessary to plan for a more rapid rate of discharge than is demanded by the schedule itself since allowance must be made for mechanical breakdowns on the part of the unloading machinery. If it is in any way feasible, I consider that at least two 78 foot berths should be available for the discharge of nightsoil and not less than three berths for the refuse barges.
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