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(a) Physical Examination
Colour Faint blue Taste normal
Appearance Bright and clear Smell none
Electric Conductivity at 20°C. 255 Units
pH. 7.4
(b) Chemical Examination in parts per million
Total solid residue (dried at 180°C.) 176
Chlorine present as chloride 15.2
Ammonia, free 0.00
Ammonia, Albuminoid 0.00
Nitrate nitrogen 5.9
Nitrite nitrogen —
Oxygen absorbed from (a) in 4 hours 0.11
permanganate solution (b) in 15 mins. —
Hardness, as CaC03—Temporary 89
Permanent 32
Total 121
Alkalinity, as CaCOa 89
Free carbon dioxide, as C02 —
Iron absent
Other metals absent
Residual chlorine —
(c) Bacteriological Examination
Number of colonies developing per millilitre of water:—
on agar in 2 days at 37 °C. 0
on agar in 3 days at 22 °C. 0
Bacteria of indication enumeration:—
Organisms of the coliform group 0 per 100 ml.
Streptococci 0 „
CI. welchii 0 „
Remarks
This water is of good organic purity, attractive in appearance and of moderate
hardness and salinity. It is similar in chemical composition to previous samples
from the same source.
The bacteriological condition of the water is excellent.
As judged by this examination, the water is pure and wholesome and is suitable for
the public supply.
Drainage and Sewerage
The routine work of cleansing and flushing of soil and surface water
sewers, the maintenance of soakaways and repairs to road gullies, frames
and manhole covers was carried out by the Engineer and Surveyor's
department.
A new manhole was constructed on the existing soil sewer in Park
Lane between Acre Lane and Park Gate Road.
The construction of a relief surface water sewer in Culvers Avenue
between Green Wrythe Lane and the River Wandle is now in hand.
Three hundred and thirty-one drainage obstructions affecting 1,038
properties were dealt with during the year.
Rivers and Streams
Routine clearance of the River Wandle and its tributaries, which is the
responsibility of the County Council, was carried out by that Authority.
The Improvement Scheme for the River Wandle prepared by the
County Council and referred to in last year's report, has been agreed by the
District Authorities bordering the River and work is expected to commence
on the down river reaches in 1960.
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