[Report 1963] / Medical Officer of Health, Torquay Borough.

  • Torquay (England). Borough Council.
Date:
1963
Catalogue details

Licence: Attribution 4.0 International (CC BY 4.0)

Credit: [Report 1963] / Medical Officer of Health, Torquay Borough. Source: Wellcome Collection.

    39/92 (page 37)
    BACTERIOLOGICAL RESULTS xt i r ri i f 1 day at 37 C. Number of Colonies j A i j i • a < 0 per ml. developing on Agar ] ^ 2 days at 37°C. 0 per ml. Presumptive Coli-aero- Present in genes Reaction . . — ml. Bact. coli (Type 1) . . -—- ml. Cl. welchii Reaction . . —ml. Absent from 100 ml. 100 ml. 100 ml. 3 days at 20°- 22”C. 0 per ml. Probable Number 0 per 100 ml. 0 per 100 ml. This sample is reasonably clear and bright in appearance, alkaline in reaction and free from metal apart from minute traces of iron and aluminium. The water is soft in character and has a comparatively low content of mineral constituents. It is free from noticeable colour, of a high standard of organic quality and of satsifactory bacterial purity. These results are indicative of a pure and wholesome water suitable for public supply purposes. H. Sample 15.11.63. Chapel Hill Service Reservoir, Torquay. Fully treated water - coagulated, filtered, hardened and chlorinated. Source: Tottiford and Fern worthy Catchments. CHEMICAL RESULTS IN PARTS PER MILLION Appearance: Bright with a few particles Colour 8 pH. 8.6 Electric Conductivity 84 Chlorine present as Chloride 12 Hardness: Total . . 25 Nitrate Nitrogen 0.7 Ammoniacal Nitrogen 0.010 Albuminoid Nitrogen 0.043 Metals: Aluminium 0.13 Iron 0.08 Zinc, Copper, Lead and Manganese Absent Turbidity .. .. Less than 3 Odour .. .. .. Nil Free Carbon Dioxide ... Trace Dissolved Solids dried at I80°C. 56 Alkalinity as Calcium Carbonate . . . . 10 Carbonate . . 15 Non-Carbonate 10 Nitrite Nitrogen ... less than 0.01 Oxygen Absorbed . . . . 1.0 Residual Chlorine . . . . 0.04 BACTERIOLOGICAL RESULTS Number of Colonies developing on Agar f 1 day at 37°C. 2 days at 37°C. < 2 per ml. 9 per ml. Presumptive Coli-aero- Present in genes Reaction . . — ml. Bact. coli (Type 1) . . —ml. Cl. welchii Reaction . . — ml. Absent from 100 ml. 100 ml. 100 ml. 3 days at 20°- 22C. 2 per ml. Probable Number 0 per 100 ml. 0 per 100 ml. This sample is practically clear and bright in appearance, has a reaction on the alkaline side of neutrality and is free from metals apart from minute traces of iron and aluminium. The water is very soft in character and has a fairly low content of mineral and saline constituents in solution. Its organic quality and bacterial purity are of a high standard. These results are indicative of a pure and wholesome water suitable for public supply purposes. 0Signed) GORDON MILES, for The Counties Public Health Laboratories