1974-1975 — Page 27

Public Works Department Annual Report 工務司署年報 All AI Reviewed
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(a) Chemical quality (values expressed in parts per million)

1973-74 1974-75

Range Average Range Average Total hardness (as CaCO3) 10-64 28 10-55 31 Salinity (as NaCl) 10-168 40 8-97 39 Total dissolved solids 30-240 75 23-148 73 Fluorides (as F) 0.8 0.8

(Target level 1.0 p.p.m.)

(b) Bacteriological quality

1973-74 No. taken orgs./100 ml. Samples from treatment works and service reservoirs Free from Coliform 2,971 100% 1974-75 Samples from consumers' taps Free from Coliform 3,498
4,088 99.57%
99.24% 3,324 99.88%

216

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(a) Chemical quality (values expressed in parts per million) 1973-74 1974-75 Range Average Range Average Total hardness (as CaCO3) 10-64 28 10-55 31 Salinity (as NaCl) 10-168 40 8-97 39 Total dissolved solids 30-240 75 23-148 73 Fluorides (as F) 0.8 0.8 (Target level 1.0 p.p.m.) (b) Bacteriological quality 1973-74 No. taken orgs./100 ml. Samples from treatment works and service reservoirs Free from Coliform 2,971 100% 1974-75 Samples from consumers' taps Free from Coliform 3,4984,088 99.57%99.24% 3,324 99.88% 216
Baseline (Original)
(a) Chemical quality (values expressed in parts per million) 1973-74 1974-75 Range Average Range Average Total hardness (as CaCO3) 10-64 28 10-55 31 Salinity (as NaCl) 10-168 40 8-97 w 39 Total dissolved solids 30-240 75 23-148 73 Fluorides (as F) 0.8 0.8 (Target level 1.0 p.p.m.) (b) Bacteriological quality 1973-74 Free from Coliform No. taken orgs./100 ml. Samples from treat- ment works and 2,971 100% service reservoirs 1974-75 Free from Coliform No. taken orgs./100 ml. 3,324 99.88% Samples from consumers' taps 3,498 99.57% 4,088 99.24% 216
2026-05-12 06:03:59 · Baseline
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(a) Chemical quality (values expressed in parts per million)

1973-74

1974-75

Range Average

Range

Average

Total hardness (as CaCO3)

10-64

28

10-55

31

Salinity (as NaCl)

10-168

40

8-97

w

39

Total dissolved solids

30-240

75

23-148

73

Fluorides (as F)

0.8

0.8

(Target level 1.0 p.p.m.)

(b) Bacteriological quality

1973-74

Free from Coliform

No. taken orgs./100 ml.

Samples from treat-

ment works and

2,971

100%

service reservoirs

1974-75

Free from Coliform

No. taken orgs./100 ml.

3,324

99.88%

Samples from

consumers' taps

3,498

99.57%

4,088

99.24%

216

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