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39
Considerable mains extensions have been carried out by both
the Metropolitan Water Board and the South Essex Waterworks
Company, to deal with the development of the various building
estates in the more outlying parts of the Town.
2. Rivers and Streams.—Vide Annual Report, 1925.
(a) Seven Kings Stream.
A certain amount of difficulty has been created in this stream by the
discharge of the effluent from the Corporation's Sewage Works at Hainault,
unsatisfactory samples having been obtained ; it was considered that this might
be on account of trade sewage being admitted from a firm of tarpaulin manufacturers.
This firm, on representation, put in a series of settlement and filtration
tanks, and this was sufficient to render their sewage satisfactory for treatment,
as proved by analysis.
Further samples of effluent discharged into the stream, did not, however,
give a good result, and the Analyst reported that beet washing from certain
premises might interfere with the treatment of the sewage. This beet washing
effluent has been diverted from the Hainault Sewage Works, and irrigated over
the crops on the land. Further samples of the effluent are being taken.
(b) Goodmayes Watercourse.
A firm of Accumulator manufacturers were found to be discharging into
the surface water sewer, drainage from presses in the pasting shop. A sample
of the discharge was taken and the Analyst's report stated: "this is a markedly
acid liquid containing large traces of lead and iron salts."
This firm subsequently constructed a filter for cleansing the effluent prior
to its discharge into the surface water sewer.
(c) Outfall Sewer from Sewage Works to River Roding.
Complaint was made during the early part of the year by the Port of
London Authority that acid was being discharged into the River Roding
through the effluent pipe from the Sewage Works. The pipe was inspected in
Ilford Lane and no acid was found in the pipe at that point. The pipe afterwards
passes close to a chemical works and through the curtilage of another
chemical works. Both these firms use acids in considerable quantities. Careful
investigation was made at the time, but the source of the acid discharge was not
located. Further excavation and investigation was carried out, and the Port
of London Authority, as well as this Department, have the matter under
observation.
(d) River Roding (Wanstead Sewage Works).
Arising out of a complaint received as to pollution of the River Roding
by the Wanstead Sewage Works a sample of the effluent was taken and the
result transmitted to the Wanstead Urban District Council. A reply was
received to the effect that a Contract had been entered into by the Wanstead
Urban District Council for carrying out extensions to their Works, which should
be completed in nine months from April, 1930.