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(9)
The Board of Agriculture suggests that the number of
samples which should be taken in any district is three per 1,000
of the population.
DRAINAGE AND SANITARY CONVENCES.
The drains or sanitary fittings of 69 premises were found
to he in some respect defective. In 15 cases it was found necessary
to take up and entirely relay the drains. In 31 cases drains were
found to he stopped up. 19 water closets, 14 sinks, 50 water closet
cisterns, 24 inspection chambers and 15 soil pipes were renewed or
repaired. 3 cesspools were abolished.
It was necessary to obtain the authority of the Council
under Section 41 of the Public Health Act 1875, to enter premises
for the purpose of opening up the ground and examining the drains
of eight houses. In all cases the drains were found to be defective.
Three cesspools were abolished after drains had been relayed
and connected to the sewer.
I reported last year that the Dollis Brook was being
polluted by sewage from the St. Josephs Convent School at Totteridge,
and Statutory Notice was served upon the owners requiring them to
install an approved sewage purification plant of sufficient capacity
to deal with a school of 250 boarders and staff.
There being no sewer to drain into, plans were submitted
at the end of 1936 and the work was proceeded with during this
year, and an up to date plant installed consisting of a Settlement
Tank, Rotary Filter Bed and Humus Chamber.
The plant is working satisfactorily and has given a clear
and good effluent up to the present.
A complaint was received from the Secretary of the
Ratepayers Association concerning the condition of the Brook near
Folly Farm, which forms the boundary between Totteridge, Barnot
and Mill Hill, Hendon, An inspection of the Brook revealed a