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47
Bacteriological.
No. of samples 251 252 251 256
Colony count on Agar at 37 °C — — — 27.9
B. Coli test: —
% of samples negative 100 ml. 100 100 100 98 1
B. Coli per 100 ml 0.0 0.0 0.0 0.031
DRAINAGE AND SEWERAGE.
The Borough Engineer reports that the construction of 260
yards of 24 inch diameter surface water sewer in Princes Plain
was completed during the year in connection with the erection of
permanent prefabricated houses.
CESSPOOLS.
No new premises were erected with cesspool drainage, and
the details of inhabitated properties in the Borough which are
not on the water carriage drainage system are as shown in the
Annual Report for 1946.
RIVERS, STREAMS AND LAKES.
The Borough Engineer reports that the length of 170 yards
of the River Ravensbourne immediately north-west of the
culvert under the builder's yard in Westmoreland Road was regraded,
and 20 yards north-west of Hayes Lane culverted.
Ten inspections and reinspections were made by the sanitary
inspectors during the year, and an inspection was made of the
pond in Church House Gardens following upon the receipt of a
complaint as to its condition. Two samples of water were taken
from this pond, with the following results:—
Sample A.—B. Coli (presumptive) present in 1 c.c., absent in 1/10 c.c.s.
Further tests showed that these were not typical B. Coli.
Sample B.—B. Coli (presumptive) present in 1/10 c.c., absent in 1/100
c.c.s. Further tests showed that these were not typical B. Coli.
There was no evidence of recent faecal contamination in
either sample.
SWIMMING BATHS AND POOLS.
The sanitary inspectors made a total of 28 inspections of
swimming baths and pools in the Borough, and 16 samples of
water were taken for examination. The results of these
examinations are as follows:—
Four samples taken from the Corporation's Swimming Pool
all satisfactory.
Twelve samples taken from privately owned swimming
baths and pools—10 were found to be satisfactory, and 2 were