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77
I have been instructed by the Port Sanitary Committee to take samples
when the works are completed, and submit them to the City Analyst in order
to ascertain that the necessary standard of purity of the effluent is maintained.
THE FIRST SCHEDULE.
REGULATIONS FOR EXAMINING THE EFFLUENT AND FOR
PRESCRIBING THE STANDARDS OF PURITY.
A.—Method of taking Samples.
1. The Corporation shall provide and maintain a manhole in the outfall
pipe or conduit (Work No. 12) authorised by this Act, at a point near to
the boundary of the lands described in the section of this Act whereof the
marginal note is " Utilization of sewage lands," and shall provide facilities in
the manhole for collecting samples of the effluent discharged from the works.
2. At intervals of half-an-hour three samples of the effluent, each containing
one gallon, shall be collected at the said manhole. These samples shall be
mixed together, and three clean glass stoppered Winchester bottles shall be
filled therefrom. These bottles shall be properly sealed and labelled. One of
such bottles shall be taken by the medical officer taking the samples, and the
other two bottles shall be left with a representative of the Corporation at
their sewage works, one of the bottles so left being retained by the Corporation
in an ice-box for examination, in case of difference, by a person from time to
time appointed for the purpose by the Local Government Board.
B.—Standards of Purity.
3. Solid matter.—Each gallon shall not contain more than four grains of
solid matter in suspension.
4. Odour.—The effluent shall have no offensive odour, and when kept for
three days at a temperature of 98 degrees Fahrenheit in a full stoppered
bottle, shall not develop a putrefactive odour.
5. Impurity figure.—The impurity figure, as ascertained by the method
described in these regulations, shall not exceed 16.
C.—Method of Examination.
6. In order to ascertain the quantity of solid matter in suspension, put 700
cubic centimetres of the sample into a suitable cylinder so that it may be
about one foot in depth, and allow it to stand for a period of 24 hours. At
the end of that period withdraw 650 cubic centimetres by means of a syphon,