СОРУ
G.F. 73A.
From
Director of Marine.
M.D. 565/1950.
27th July, 1951.
120
Memo
To
Hon. C.U.C.
Your ref: S.D. 482/49.
159
(118)
PROPOSED COMPOST FACTORY AT TSUN WAN.
Your memo dated 12th July, 1951. P.W.D. plan of the layout at Tsun Wan was seen and discussed with Mr. Strange. No details are yet known as to how Mr. Brunt will propose to handle the night soil and refuse once it is landed at the site.
1. Night Soil. It is anticipated that the barges designed to carry night soil in buckets will need to be converted to bulk carriage. This should present no technical difficulty but will cost money. Probably one barge in the new scheme could carry as much as two barges in the existing scheme, but the number of barges to be converted will also depend to some extent on the number of collection points and the facilities provided for storage at those points. At the factory site presumably the night soil will be pumped ashore and it will be possible to have tow barges berthed abreast and pumped out through flexible hoses to the shore main. Alternatively, a pier to take one barge on either side would be suitable with a central delivery pipe.
2. Refuse. In this case everything depends on Mr. Brunt's proposals for handling the refuse once it is ashore. If the refuse is to be carried in separate bins on the barges, each to
be lifted ashore bodily and tipped, the question of the number of bins and loaded weight of each is of primary importance regarding crane strength. If, for instance, a loaded bin is five tons, then
The out-reach about 16 will be required for each barge.
of the crane would be the distance from crane centre to a point 18 feet from the shore side of the barge. The point then arises as to whether the crane would need to be mobile to discharge each delivery into a single hopper from which refuse would be delivered to a conveyor belt system for sorting. If so, the time taken to unload one barge might be excessive and even more
On the so if the bins were smaller to suit a smaller crane. other hand, possibly the conveyor belt would run along parallel to the sea wall and the crane take up a new position only when proceeding to unload the next barge.
Out-reach of the crane will be excessive if barges are moored abreast for unloading and it looks therefore as though at least three berths would be required for refuse barges. Instead of fitting separate dolphins, the better plan would be to
Barges have a dolphin structure the whole length of the sea wall. could then be moored on arrival directly to the frontage and unloaded each in its place or, in the alternative, if Mr. Brunt's scheme requires delivery to one central hopper, each barge could be hand-hauled along the sea front to the fixed unloading point, without the necessity for keeping a tug in constant attendance to bring barges in from moorings off shore.
3.
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Tugs. Our tugs are being overworked now, and if a tug is required to stand by at the factory, the cost of one tug plus operating expenses, must be added to the cost of the compost scheme. The present capital cost of a tug such as now used is roughly $350,000 to $400,000.
cc Hon. C.S.
D.P.W.
(sd) W. Sprague
for Director of Marine.
Page 160Page 161
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