1948-1949 — Page 64

Public Works Department Annual Report 工務司署年報 All AI Reviewed
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60

TABLE IV

QUALITY OF WATER.

Summary of Water Analyses for 1948/49.

Bacteriological Analyses

Number shewing B. Coli present in :--

Type of Water Locality Total No. of Samples examined Number shewing B. Coli absent in 100 cc. Number & Percentage Raw Island 198 186 11 Mainland 53 46 7 Total 251 232 19 Filtered but Unchlorinated Island 197 80 15 31 1 51 Mainland 53 35 2 1 12 12 20 Total 250 82 16 43 1 71 Filtered and Chlorinated. At Service Reservoirs. Island 223 3 1 Mainland 55 1 Total 278 3 2 10 3 Filtered and Chlorinated. From Taps Island 477 383 2 10 19 18 93 242 117 Mainland 205 92 92 24 24 77 116 116 Total 682 8 1 37 3 6 210 94% 102 102 2 52 95% 24 24 8 262 94% 126 126 6 10 42 1222 411 86% 234 234 1 6 16 179 87% 44 44 2 7 16 58 590 278 278 87%

STANDARDS OF PURITY AIMED AT —

Raw water B. Coli absent in 22 cc.

Filtered unchlorinated water B. Coli absent in 50 cc. Filtered and chlorinated water B. Coli absent in 100 cc.

Note: Where bad tap samples were found the services were washed out and chlorinated.

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60 TABLE IV QUALITY OF WATER. Summary of Water Analyses for 1948/49. Bacteriological Analyses Number shewing B. Coli present in :-- Type of Water Locality Total No. of Samples examined Number shewing B. Coli absent in 100 cc. Number & Percentage Raw Island 198 186 11 Mainland 53 46 7 Total 251 232 19 Filtered but Unchlorinated Island 197 80 15 31 1 51 Mainland 53 35 2 1 12 12 20 Total 250 82 16 43 1 71 Filtered and Chlorinated. At Service Reservoirs. Island 223 3 1 Mainland 55 1 Total 278 3 2 10 3 Filtered and Chlorinated. From Taps Island 477 383 2 10 19 18 93 242 117 Mainland 205 92 92 24 24 77 116 116 Total 682 8 1 37 3 6 210 94% 102 102 2 52 95% 24 24 8 262 94% 126 126 6 10 42 1222 411 86% 234 234 1 6 16 179 87% 44 44 2 7 16 58 590 278 278 87% STANDARDS OF PURITY AIMED AT — Raw water B. Coli absent in 22 cc. Filtered unchlorinated water B. Coli absent in 50 cc. Filtered and chlorinated water B. Coli absent in 100 cc. Note: Where bad tap samples were found the services were washed out and chlorinated.
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60 TABLE IV QUALITY OF WATER. Summary of Water Analyses for 1948/49. Bacteriological Analyses Number shewing B. Coli present in :-- Number & Percentage Physical & Chemical Analyses Total No. of Samples examined Number found satisfactory Number shewing B. Coli absent in Type of Water Locality Total No. shewing B. Coli absent in 100 cc. of Samples examined 10 cc. or less 16.6 cc. 25 cc. 33 cc. 50 cc. 100 cc. 22 cc. 50 cc. Island 198 186 11 Raw Mainland 53 46 מא 3 4 Total 251 232 19 3 15 Island 197 80 15 31 1 51 Filtered but Unchlorinated Mainland 53 35 2 1 12 12 20 Total 250 82 16 43 1223 1 71 Island 223 3 1 Filtered and Chlorinated. At Service Mainland 55 1 Reservoirs. Total 278 પ 3 2 10 3 Island 477 2 10 Filtered and Chlorinated. Mainland 205 From Taps Total 682 8 1 1 1 19 18 93 242 117 383 92 92 24 24 77 116 116 37 3 6 210 94% 102 102 2 52 95% 24 24 8 262 94% 126 126 6 10 42 1222 411 86% 234 234 1 6 16 179 87% 44 44 2 7 16 58 590 87% 278 278 STANDARDS OF PURITY AIMED AT — Raw water B. Coli absent in 22 cc. Filtered unchlorinated water B. Coli absent in 50 cc. Filtered and chlorinated water B. Coli absent in 100 cc. Note: Where bad tap samples were found the services were washed out and chlorinated.
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60

TABLE IV

QUALITY OF WATER.

Summary of Water Analyses for 1948/49.

Bacteriological Analyses

Number shewing B. Coli present in :--

Number & Percentage

Physical & Chemical Analyses

Total No. of Samples examined

Number found satisfactory

Number shewing B. Coli

absent in

Type of Water

Locality

Total No.

shewing B. Coli absent in 100 cc.

of Samples examined

10 cc. or less

16.6 cc.

25 cc.

33 cc.

50 cc.

100 cc.

22 cc.

50 cc.

Island

198

186

11

Raw

Mainland

53

46

מא

3

4

Total

251

232

19

3

15

Island

197

80

15

31

1

51

Filtered but Unchlorinated

Mainland

53

35

2

1

12

12

20

Total

250

82

16

43

1223

1

71

Island

223

3

1

Filtered and

Chlorinated.

At Service

Mainland

55

1

Reservoirs.

Total

278

પ

3

2

10

3

Island

477

2

10

Filtered and Chlorinated.

Mainland

205

From Taps

Total

682

8

1

1

1

19

18

93

242

117

383

92

92

24

24

77

116

116

37

3

6

210

94%

102

102

2

52

95%

24

24

8

262

94%

126

126

6

10

42

1222

411

86%

234

234

1

6

16

179

87%

44

44

2

7

16

58

590

87%

278

278

STANDARDS OF PURITY AIMED AT —

Raw water B. Coli absent in 22 cc.

Filtered unchlorinated water B. Coli absent in 50 cc. Filtered and chlorinated water B. Coli absent in 100 cc.

Note: Where bad tap samples were found the services were washed out and chlorinated.

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