[Report of the Medical Officer of Health for Chislehurst] page 47

Chislehurst 1956

[Report of the Medical Officer of Health for Chislehurst]

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Average Results of the Chemical and Bacteriological Examination of the water supplied to Chislehurst and Sidcup Urban District Council during 1956.

Milligrammes per litre (unless otherwise stated).

Description of the Sample	Bexley New Well	North Orpington Well No. 1	Orpington	Short-lands No. 1	Short-lands No. 2	Eyns-ford Bore Hole	Eyns-ford Well	Horton Kirby	Wilmington No. 1	Wilmington No. 2	Darenth Well	Darenth Bore Hole	Thames-derived
Number of Samples	5	3	3	4	4	1	3	3	4	4	3	3	1598
Ammonia Nitrogen	0.006	0.002	0.003	0.001	0.005	0.000	0.005	0.005	0.012	0.004	0.005	0.007	0.036
Albuminoid Nitrogen	0.022	0.027	0.018	0.024	0.025	0.025	0.023	0.023	0.027	0.026	0.027	0.030	0.086
Oxidised Nitrogen—Nitrite	—	—	—	—	—	—	—	—	—	—	—	—	—
Oxidised Nitrogen—Nitrate	5.6	4.7	6.2	4.8	5.1	4.0	3.8	4.5	6.6	8.4	5.0	5.5	4.3
Chlorides as Cl.	17	12	15	16	16	15	14	17	22	21	16	16	30
Oxygen abs. from Perman ganate 4 hrs. at 27°C.	0.06	0.06	0.10	0.08	0.06	0.06	0.06	0.06	0.18	0.18	0.06	0.12	1.16
Turbidity in terms of Silica	Nil	Nil	Nil	Nil	Nil	—	Nil	Nil	Nil	Nil	Nil	Nil	0.3
Colour, m.m. brown 2 ft. Tube Burgess's Tintometer	Nil	Nil	Nil	Nil	Nil	—	Nil	Nil	Nil	Nil	Nil	Nil	13
Hardness (Total)	282	262	278	282	282	248	260	256	284	292	262	280	258
Hardness (non-carbonate)	54	42	48	74	72	42	40	42	56	62	38	54	72
pH Value	7.2	7.1	7.1	7.2	7.2	7.3	7.2	7.2	7.1	7.2	7.1	7.2	7.7
Phosphate as PO₄	—	—	—	—	—	—	—	—	—	—	—	—	0.90
Silicate as SiO₂	—	—	—	—	—	—	—	—	—	—	—	—	10
Sulphates as So₄	28	8	16	40	40	8	12	20	22	22	14	22	58
B.O.D. 5 days at 20°C.	—	—	—	—	—	—	—	—	—	—	—	—	—
Electrical Conductivity (gemmhos)	475	450	475	475	500	400	400	425	400	425	425	450	500