[Report 1969] / Medical Officer of Health, Calne & Chippenham R.D.C.

  • Calne and Chippenham (England). Rural District Council.
Date:
1969
Catalogue details

Licence: Attribution 4.0 International (CC BY 4.0)

Credit: [Report 1969] / Medical Officer of Health, Calne & Chippenham R.D.C. Source: Wellcome Collection.

    38/56 (page 24)
    Bacteriological Examimation of Untreated \7ater froia Soorces. Similar supervisory ;TOrk is done regular], with untreated waters from the Board's sources, and in the past year the results were as follows 674 samples of raw water were submitted. Excellent: Colif om count Of less than 1 • • • 484 Satisfactory: It ti II 1-3 • « • A. « • 112 Suspicious: It 11 II 4-10 • « • • • • 39 Unsatisfactory: It M II more than 10 ... 39 Samples excellent and satisfactory, 88-g^. Typical Chemical Analyses of Raw Waters. Source and Date: Chippenham Borehole 19^11,63 Rodbourne Borehole 16.7.69 Charlton Borehole 22.10.69 Calstone Springs 16.4.69 widdenham Springs 18.6,69 Colour Nil Nil Nil Nil Nil Odour Nil Nil Nil Nil Nil pH. ) 7.2 7.6 7.3 7.1 7.5 Free CO2 (p.p.ra. 35 12 27 45 16 Chloride ( / 49 42 23 13 44 Hardness ( ) ) 350 300 290 325 305 Carbonate s ( 275 215 25G 275 235 Non-Carbonates ( ) 75 85 40 50 70 Nitrate Nitrogen( 0.3 0.4 2.5 3.3 3.1 Nitrite Nitrogen ( ” ) Absent Absent Absent Absent Absent Oxygen Absorbed ( ) 0,30 0.00 0.00 0.00 0.00 Alb.Nitrogen ( ) ) 0.02 0.00 0.20 OclO 0.00 Metals 1 Absent Absent Absent Absent Absent Fluoride ( ” J - ) 0.75 0.75 0.4 Less ihan 0.1 0.2 Chlorination of all sources is practised vdth the aim of obtaining .Chlorine residuals at all consumers’ points of supply of between 0.1 and 0.3 parts per million. The Board continues to exercise supervision of the quality of raw water from all the sowces by submitting samples to their Consultant Chemists, the Counties Public Health Laboratories, London, and any changes in chemical or mineralogical qualities of the water are reported upon by Ivir.Gordon lliles, the Principal of those Laboratories, Fluoride occurs naturally in quantities from 0,4 to 0,7 parts per million in the v;ater obtained from the deep borehole sources in the limestone, but it is usually absent in the v/aters obtained from shallow wells and spring sources. The Board is advised by its Consultant Chemists that none of the waters supplied are plumbo-solvent. The Board continues to make provision for increases in the demand for water, by seeking additional sources, and this v/ork is being done in close co-operation with the River Authorities, v/hose statutory areas extend through the Board’s area of supply. -24-