[Report of the Medical Officer of Health for Wembley] page 39

Wembley 1936

[Report of the Medical Officer of Health for Wembley]

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Table: CHEMICAL AND BACTERIOLOGICAL WATERREPORTS.

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CHEMICAL AND BACTERIOLOGICAL WATER

REPORTS.

CHEMICAL.	Sample of Water. Colne Valley Water Co. 20/7/36.		Sample of Water. L.M.S. Railway Supply. 16/12/36.		Sample of Water. Rickmansworth & Uxbridge Public Supply. 12/8/36.
CHEMICAL.	Parts per 100,000	Grains per Gallon.	Parts per 100,000	Grains per Gallon.	Parts per 100,000	Grains per Gallon.
Total Solids (dried at 120°C)	39.00	27.30	17.0	11.9	36.5	25.6
Combined chlorine	7.80	5.46	2.50	1.75	7.50	5.25
equivalent to Na CI	12.87	9.01	4.13	2.89	12.38	8.67
Nitric nitrogen (Nitrates)	0.50	0.35	0.46	0.32	0.50	0.35
Nitrous nitrogen (Nitrites)	Nil	Nil	Nil	Nil	Nil	Nil
Ammoniacal nitrogen	0.0002	0.0001	0.0010	0.0007	0.0003	0.0002
Albuminoid nitrogen	0.0036	0.0025	0.0070	0.0049	0.0028	0.0020
Oxygen absorbed in 4 hours at 27°C	0.035	0.024	0.071	0.050	0.031	0.022
Lead or Copper	Nil	Nil	Nil	Nil	Nil	Nil
Temporary hardness (equivalent to CaCo3)	15.0	10.5	3.5	2.4	16.0	11.2
Permanent hardness	Nil	Nil	4.5	3.2	Nil	Nil
Total hardness	15.0	10.5	8.0	5.6	16.0	11.2
BACTERIOLOGICAL.
Average number of organisms producing visible colonies on gelatine plates, incubated at 200220C. for 3 days	24 per c.c.		44 colonies per c.c.		7 per c.c.
Average number of organisms producing visible colonies on agar plates, incubated at 37.5°C. for 2 days	10 per c.c.		17 colonies per c.c.		3 per c.c.
B. Coli	Not found in 100 c.c.		Not found in 100 c.c.		Not found in 100 c.c.
Streptococci	Not found in 30 c.c.		Not found in 30 c.c.		Not found in 30 c.c.
B. Welchii (spores)	Not found in 100 c.c.		Not found in 100 c.c.		Not found in 100 c.c.
BACTERIOLOGIST'S REMARKS:	Results shew this water to be quite satisfactory for drinking purposes.		Results shew this water to be quite satisfactory for drinking purposes.		Results shew this water to be quite satisfactory for drinking purposes.