1976-1977 — Page 255

Public Works Department Annual Report 工務司署年報 All AI Reviewed
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APPENDIX CC - Cont'd.

1975-76 1976-77

Average dose Tonnes (mg/1) Tonnes Liquid chlorine 558 1.5 642 Average dose (mg/1) 1.6 Sodium silicofluoride 484 0.8 533 0.8 (as fluoride) (as fluoride)

Salt Water Liquid chlorine, 103 1.6 126 1.8

(12) Quality of Supply

(a) Chemical quality (values expressed in mg/1)

1975-76 1976-77 Range Average Range Average Total hardness (as CaCO3) 10-36 24 10-55 26 Salinity (as NaCl) 10-74 26 5-83 30 Total dissolved solids 27-107 53 25-125 64 Fluoride (as F) (Target level 1.0 mg/1) 0.8 0.8

(b) Bacteriological quality :

1975-76 1976-77 No. taken Free from coliform orgs./100 ml. No. taken Free from coliform orgs./100 ml. Samples from treatment works and service reservoirs 3,654 100% 3,619 99.97% Samples from consumers' taps 5,113 99.67% 4,938 99.23%

245

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APPENDIX CC - Cont'd. 1975-76 1976-77 Average dose Tonnes (mg/1) Tonnes Liquid chlorine 558 1.5 642 Average dose (mg/1) 1.6 Sodium silicofluoride 484 0.8 533 0.8 (as fluoride) (as fluoride) Salt Water Liquid chlorine, 103 1.6 126 1.8 (12) Quality of Supply (a) Chemical quality (values expressed in mg/1) 1975-76 1976-77 Range Average Range Average Total hardness (as CaCO3) 10-36 24 10-55 26 Salinity (as NaCl) 10-74 26 5-83 30 Total dissolved solids 27-107 53 25-125 64 Fluoride (as F) (Target level 1.0 mg/1) 0.8 0.8 (b) Bacteriological quality : 1975-76 1976-77 No. taken Free from coliform orgs./100 ml. No. taken Free from coliform orgs./100 ml. Samples from treatment works and service reservoirs 3,654 100% 3,619 99.97% Samples from consumers' taps 5,113 99.67% 4,938 99.23% 245 Page 255 Page 256
Baseline (Original)
APPENDIX CC - Cont'd. 1975-76 1976-77 Average dose Tonnes (mg/1) Tonnes Liquid chlorine 558 1.5 642 Average dose (mg/1) 1.6 Sodium silicofluoride 484 0.8 533 0.8 (as fluoride) (as fluoride) Salt Water Liquid chlorine, 103 1.6 126 1.8 (12) Quality of Supply (a) Chemical quality (values expressed in mg/1) 1975-76 1976-77 Range Average Range Average Total hardness (asCaCO12) 10-36 24 10-55 26 3 Salinity (as NaC1) 10-74 26 5-83 30 Total dissolved solids 27-107 53 25-125 64 Fluoride (as F) (Target level 1.0 mg/1) 0.8 0.8 (b) Bacteriological quality : 1976-77 Free from 1975-76 Free from coliform orgs./100 ml. No. taken No. taken Samples from treatment coliform orgs./100 ml. works and service reservoirs 3,654 100% 3,619 99.97% Samples from consumers' taps 5,113 99.67% 4,938 99.23% 245 Page, 255Page 256 1
2026-05-12 09:57:54 · Baseline
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APPENDIX CC - Cont'd.

1975-76

1976-77

Average dose

Tonnes

(mg/1)

Tonnes

Liquid chlorine

558

1.5

642

Average dose (mg/1)

1.6

Sodium silicofluoride 484

0.8

533

0.8

(as fluoride)

(as fluoride)

Salt Water

Liquid chlorine,

103

1.6

126

1.8

(12) Quality of Supply

(a) Chemical quality (values expressed in mg/1)

1975-76

1976-77

Range

Average

Range

Average

Total hardness

(asCaCO12)

10-36

24

10-55

26

3

Salinity (as NaC1) 10-74

26

5-83

30

Total dissolved

solids

27-107

53

25-125

64

Fluoride (as F)

(Target level

1.0 mg/1)

0.8

0.8

(b) Bacteriological quality :

1976-77

Free from

1975-76

Free from

coliform

orgs./100 ml.

No. taken

No. taken

Samples from treatment

coliform

orgs./100 ml.

works and service

reservoirs

3,654

100%

3,619

99.97%

Samples from

consumers' taps

5,113

99.67%

4,938

99.23%

245

Page, 255Page 256

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