became polluted and after extensive investigation it was decided that the pollution was caused by leakage into two of the service reservoirs. Repairs were put in hand.
306. Out of a total of 305 samples taken from service reservoirs, 288 were of the required standard of purity, 10 of the bad samples being from the Peak area. The overall percentage of samples which showed absence of B. Coli in 100 c.c. was 95%.
307. A total of 618 samples, of which 555 were up to the required standard, was taken from consumers' taps. With the exception of the Peak district the source of pollution was in all cases traced to defects in the consumers' inside services.
308. Pumping. The number of gallons pumped during the year as compared with the previous year was as follows:
Total 1954/55 1953/54 Decrease Raw Water 2,470 million gallons 4,116 million gallons 1,646 million gallons Filtered Water 1,646 million gallons 3,273 million gallons 1,639 million gallons Total ... 5,755 million gallons 803 million gallons ... 2,482 million gallons 25 million gallons 836 million gallonsThe total quantity pumped was approximately 28.1% less than during last year.
309. Waste Detection. The necessity for a restricted supply again prevented much real work being done on waste detection. Attention was confined to tracing visible defects in mains and inside services and the prevention of use of water by consumers for any purposes other than purely domestic.
310. Metered Services. During the year 2,225 additional metered services were installed on the Island and 2,615 on the Mainland, bringing the total to date up to 44,465 of which 23,135 are on the Island and 21,330 on the Mainland.
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