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54
Chemical Examination
Milligrammes per
litre
(unless otherwise stated)
Ammonia Nitrogen 0. 027
Albuminoid Nitrogen 0.074
Oxidised Nitrogen-Nitrate 3.9
Chloride as C1. 29.
Oxygen abs. from Permanganate
4 hrs. at 27°C 1.16
Turbidity in terms of Silica 0.3
Colour m.m. brown 2 ft. Tube
Burgesses Tintometer 11.
Hardness (Total) 260
Hardness (non-Carbonate) 56
PH Value 7.9
Phosphate as P04 0.90
Silicate as Si02 10
Electrical Conductivity (Gemmhos) 550
Bacteriological Examination (After dilorination)
Plate counts (average per ml.)
Colonies counted on agar 37°C (20-24 hrs.) 6.4
Coliform test Percentage Samples negative
in 100 ml.
Coliform 99.33
E. Coli 99.91
SECTION 95 PUBLIC HEALTH (LONDON)
ACT 1936
In 1957 Certificates of Habitation were issued in respect of
1,258 new dwellings in regard to the provision of a proper and
sufficient water supply, 642 of these were for Borough Council
property.