Repository: UIHistories Project: Board of Trustees Minutes - 1880 [PAGE 130]

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128 Well Water—Continued.

Potassium permanganate required Organic matter Organic matter Potassium permanganate required 5.72 3.95 3.95 1.41 1.97 3.66 1.97 2.53 18.33 4.93 4 51 *11.28 1.97 0.84 49.79 2.11 1.00 2.01 3.05 2.03 2.37 2.37 0.33 4.02 2.71 2.01 0.33 1.35 j | ! i ! ! | ! I ! 1 ! ! ! 1

S p e c i m e n of w a t e r .

| S p e c i m e n of w a t e r ,

33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60

28.60 ! 61 19.75 62 19.75 63 7.05 64 9.85 65 18.30 66 9.85 67 12.65 68 91.65 69 24.65 70 22.55 71 56.40 72 9.85 73 4.20 |74 248.95 75 10.55 76 5.00 J77 10.05 !78 15.15 79 10.15 80 11.85 81 11.85 82 1.65 83 20.10 |84 13.55 185 10.05 86. 1 65 !87 6.75

•

' ,

5.43 1.35 3.73 4.45 1.60 1.60 9.17 17,52 14.07 6.11 1.43 3.05 49.26 7.81 1.15 1.60 2.71 2.01 0.67 5.43 4.02 1.60 1.01 0.69 6.61 3.73 3.05

27.15 6.75 18.65 22 25 8.00 8.00 45.85 87.60 70 35 30.55 7.15 15.15 246.30 39.05 5.75 8 00 13.55 10.05 3.35 27.15 20.10 8.00 5.05 3.35 33.05 18.65 15.25

II. Potassium Permanganate required. 11.30 14.10 35.91 18.81 24.54 1.41 15.50

CISTERN WATERS. Potassium Permanganate required. 18.90 11.14 10.77 6.45 1.52 24.70 33.01

Specimen of W a t e r .

Organic Matter.

Specimen of Water.

Organic Matter.

1 2 3 4 5 6 7

56 50 70.55 179.55 94.05 122 70 7.05 77.50

8 9 10 11 12 13 14

94.50 55.70 53.85 32.25 7.60 123.20 165.05

By referring to the results above, it will be seen that organic matter is a constant constituent of both well and cistern water, and that its amount varies widely in both kinds of water. The amount of organic matter usually assumed to be admissible in drinking water is about twenty parts in a million parts of water. From the results given above, it would appear that this proportion of organic matter is entirely too high to be taken for the standard of purity. In fact, enough of the well waters contained five parts or less of organic matter in a million, to warrant the assumption of five parts organic matter in a million parts of water as the limit for good drinking water, in this community at least. If we assume either twenty parts or five parts of organic matter in a million parts of water as the standard of purity, it will be seen that a large num-