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c). The supply being hard in character is not liable to be plumbo-solvent.
d). All new and repaired mains are disinfected with chlorine; after a predetermined
period of contact the pipes are flushed out and refilled; samples of
water are then collected from these treated mains; and the mains are returned
to service only after results are found to be satisfactory.
The quality control from these Laboratories is carried out by means of
daily sampling from sources of supply, through the treatment works or well
stations, from the distribution system, and through to the consumer. Any
sign of contamination or any other abnormality is immediately investigated.
e). (i) The Board has no record of the number of structurally separate dwellings
supplied in your area, but the population supplied direct according to the
Registrar General's estimates at 30th June, 1966, was 180,186.
(ii) No houses were permanently supplied by standpipe.
Other observations.
f). There were no changes to the general scheme of supply in your area.
g). The following additions to the mains in your area took place:
(i) trunk mains — 1,001 yards.
(ii) other mains — 875 yards."
The following water samples were taken in the Borough by Inspectors of the
Health Department:
Satisfactory. Unsatisfactory.
Swimming bath water 77 10
Paddling pool water — 2
Domestic water supply 8 —
Sewage disposal works effluent 1 —
86 12
In all cases where unsatisfactory samples of public and schools swimming bath
water were obtained immediate consultation took place with the Baths Manager; and
the follow up samples in all cases were satisfactory.
Two samples of water from a recreation ground paddling pool were taken and
although there is no specific standard laid down for these pools, the results were not
considered satisfactory. Consultation took place with the Parks Department and the
method of chlorination was checked and improved. Follow up samples were not
obtained as by this time the pool was not refilled as the summer season was at an end.
SEWERAGE & SEWAGE DISPOSAL
I am obliged to (a) Mr. A. S. Knolles, B.Sc., M.Inst.C.E., M.I.Mun.E., Chartered
C.E., the Borough Engineer and Surveyor, and (b) Mr. L. H. Thompson, A.M.I.C.E.,
A.M.I.S.P., Regional Engineer, Greater London Council for the following reports:—
a) The improvements to the air compressor stations at Hampton Wick and Bell
Hill, Hampton, referred to in the previous report, have now been completed, enabling
the compressor station at Hampton Works to be closed down. All remaining ejector
stations in the area are now undergoing a complete overhaul.
In conjunction with the widening of Heath Road, Twickenham, work is proceeding
on the laying of a new surface water sewer in the widened portion of the road.
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