[Report of the Medical Officer of Health for Southgate] page 30

Southgate 1933

[Report of the Medical Officer of Health for Southgate]

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Some time prior to sample No. 4 having been taken a quantity
of evil-smelling material was deposited in the lake by some person
or persons unknown.

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The following tables set out the Chemical and Bacteriological analyses:—

Chemical Analyses.

	Sample—
Parts per 100,000.	No. 1.	No. 2.	No. 3.	No. 4.	No. 5.	No. 6.
Chlorine	4.00	4.6	4.45	4.7	4.6	4.5
,, X 1.647 =Sodium Chloride	6.58	7.57	7.23	7.74	7.57	7.4
Nitrogen as Nitrates	Trace	Trace	0.02	Trace	Nil	Nil
Saline Ammonia	0.027	0.071	0.025	0.03	0.025	0.05
Albuminoid Ammonia	0.08	0.093	0.085	0.115	0.11	0.115
Oxygen absorbed in 3 hours at 37^oC.	0.4	0.32	0.44	0.25	0.65	0.64

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Bacteriological Analyses.

	No. 1.	Sample— No. 2.	No. 3.	No. 4.	No. 5.	No. 6.
Gelatine plates kept for 4 days at 20°C.	10 colonies per c.c.—1, or 10% liquefied gelatine.	(Complete liquefaction occurred)
Agar plates kept for 24 hours at 37°C.	28 colonies per c.e.	26	92	uncountable.	420	4,000
Bacteria	B.Coli in 0.1 o .e. Streptococci in 5 c.c. B. Enteritidis Sporogenes in 5 c.c.	B.Coli in 1 c.c.	B.Coli in 10 c.e.	B.Coli in 0.1 c.c.	B.Coli in 1 c.c.	B.Coli in 1 c.c.

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The Analysts' reports were as follows:—

Sample No. 1. Chemical.	"The figures for the albuminoid ammonia and oxygen absorbed are high and render this water unsuitable for a swimming lake."
Bacteriological.	"There is no standard for a swimming pool water, but such water should approximate to a drinking water in cleanliness, and as every feature of the examination shows pollution with excremental organisms to a high degree, it should be considered as unsuitable for bathing purposes in its present condition."