HISTORY OF COLCHESTER CORPORATION WATER WORKS. 35 
NO. 2A. ARTESIAN WELL WATER (CHALK SUPPLY). 
Sample taken a few feet, below surface of water in well, 24th February 1898. 
The organic matter contained in the water yielded :— 
When distilled with alkaline permanganate *06 parts per million of 
Ammonia 
When boiled with acid permanganate for 15 minutes, it absorbed 
1 * 40 parts per million of oxygen 
W T hen digested with acid permanganate for 4 hours at 8o° Fah., 
' 52 parts per million of oxgyen. 
Hardness. 
The total hardness in degrees per gall, was 0*0. 
Each grain of hardness represents the soap-destroying power of one 
grain of carbonate of calcium (chalk) or its equivalent of other salts. 
The Saline constituents are given below in grains per gallon 
Carbonate of Calcium .. 
4* 6 
Carbonate of Magnesium 
.. 4*2 
Carbonate of Sodium .. 
.. 11*8 
Chloride of Sodium 
•• 36*3 
Sulphate of Sodium 
•• 7*5 
Traces of Ammonia Nitrates Iron and Silica 
•• *5 
Phosphates .. .. .. .... 
none 
Total solids dried at i8o°C. 
65* 1 
The free Ammonia amounted to * 80 parts per million. 
The Nitric Nitrogen to " 1 per million. 
• 
(Signed) John Thresh, M.D., D.Sc. and F.I.C., 24th February 1898. 
NO. 3. SUDBURY CORPORATION WATER WORKS. CHALK 
WATER. 
Parts per million 
Free Ammonia .. .. .. .. .. .. .. .. * o 
Ammonia Albuminoid .. .. .. .. .. .. * 03 
Grains per gallon 
Total solid residue .. .. .. .. .. .. .. 34*27 
Chlorine .. .. .. .. .. .. .. .. .. 3*18 
Chloride of Sodium (calculated) .. .. .. .. .. 5* 25 
Nitrogen as Nitrates and Nitrites .. .. .. .. .. o* 17 
Nitrate of Soda (calculated) .. .. .. .. .. .. 1* 02 
Temporary Hardness .. .. .. .. .. .. .. 16* 6 
Permanent Hardness .. .. .. .. .. .. ..4*9 
T otal Hardness .. .. .. .. .. .. .. . . 21*5 
NO. 4 HALSTEAD WATER WORKS. CHALK WATER. 
Sample taken 200 feet from surface 
One gallon contains the following number of grains and decimal parts 
of a grain of the respective substances :— 
Total suspended solid matter dried at 250° Fah. .. .. .. none 
„ dissolved „ „ „ „ „ . 32 
Ammoniacal matter yielding 10% of Nitrogen (equal to ammonia 
per million o*07) . .. .. ..0*04 
