[Report of the Medical Officer of Health for Orpington] page 33

Orpington 1959

[Report of the Medical Officer of Health for Orpington]

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Average Results of the Chemical Examination of the Water supplied to Orpington during the Year 1959.

Milligrammes per litre (unless otherwise stated)

Description of the Sample	No. of Samples	Ammoniacal Nitrogen	Albuminoid Nitrogen	Oxidised Nitrogen	Chlorides as CL	Oxygen abs. from Permanganate 4 hrs. at 27°C.	Turbidity in terms of Silica	Colour, mm. brown 2. ft. Tube Burgess's Tintometer
Description of the Sample	No. of Samples	Ammoniacal Nitrogen	Albuminoid Nitrogen	Orpington well	Chlorides as CL	Oxygen abs. from Permanganate 4 hrs. at 27°C.	Turbidity in terms of Silica	Colour, mm. brown 2. ft. Tube Burgess's Tintometer	4	0010	0020	6-9	16	002	Nil	Nil
N. Orpington well	4	0014	0 027	5 0	14	006	Nil	Nil
Eynsford well	8	0 009	0 026	41	16	Nil	Nil	Nil
Lullingstone well	4	0013	0 024	4-3	14	008	0.1	Nil
Sundridge No. 4 well	4	0 007	0 020	3 0	16	0 04	Nil	Nil
Westerham well	4	0010	0 023	5 0	13	0 02	Nil	Nil
Thames derived	386	0030	0 074	3-6	28	104	0.4	9

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Continued from previous page

Describe of the sample	Hardness (Total)	pH. Value	Hardness (noncarbonate)	pH. Value	Phosphate as PO₄	Silicate as sio₂	sulphate as F	Magnesium MG	Potas sium as K	B.O.D. 5 days	Electrical Conductivity (Gemmhos)
Orpington well	278	44	7-2	-	-			-	1.6	-	525
N. Orpington well	262	30	7-2	-	—			-	1.7	-	475
Eynsford well	258	34	7-2	—	-			-	1.4	—	475
Lullingstone well	248	26	7-2	-	-			-	7.2	-	475
Sundridge No. 4 well	210	42	7.4	—				-	2.0	-	425
Westerham well	258	32	7.2	-	-			-	1.1	-	500
Thames derived	254	56	7-8	090	9	54	0-2	4.0	-	—	525