All measurements, tests, and analyses of the characteristics
of waters and wastes to which reference is made in this Code shall
be determined in accordance with the latest edition of IEPA Division
of Laboratories Manual of Laboratory Methods, and shall be determined
at the control manhole provided, or upon suitable samples taken at
the control manhole. In the event that no special manhole has been
required the control manhole shall be considered to be the nearest
downstream manhole in the public sewer to the point at which the building
sewer is connected. Sampling shall be carried out by customarily accepted
methods to reflect the effect of constituents upon the sewage works
and to determine the existence of hazards to life, limb, and property.
(The particular analyses involved will determine whether a twenty-four-hour
composite of all outfalls of a premises is appropriate or whether
a grab sample or samples should be taken. Normally, but not always,
BOD and suspended solids analyses are obtained from twenty-four-hour
composites of all outfalls, whereas pHs are determined from periodic
grab samples.)
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