WORLD TRADE
ORGANIZATIONG/TBT/Notif.00/294/Add.1
21 January 2002
(02-0286)
Committee on Technical Barriers to Trade Original:  Spanish
NOTIFICATION
Addendum
The following communication from Colombia is being circulated in accordance with
Article 10.6.
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By resolution 424 of 18 May 2001, Colombia has amended Articles 178 and 180 of
Resolution 1096 of 2000 adopting the Technical Regulations for the Drinking Water and Basic
Sanitation Sector, notified in document G/ TBT/Notif.00/294 of 30 June 2000, as follows:
Article 178 – PRIOR STUDIES FOR SEA OUTFALLS.  The following studies shall be
conducted before designing a sea outfall:  characterization of waste water with a view to establishing
the type of treatment needed prior to discharge - as a minimum, a screening process shall be
conducted to separate non-biodegradable floating objects that could return to the beaches;
hydrography and bathymetry of the discharge area;  statistical study of oceanic currents and their
correlation with wind velocity and direction at least once an hour, of tides and of ecosystems;
determination of the T 90  value, i.e. the time necessary for 90 per cent of the coliforms to disappear, in
hours;  geological studies of the seabed to determin e the path to be followed when installing the sea
outfall pipe, avoiding, as far as possible, irregular rock and coral formations.  The depth of disposal
shall be calculated to guarantee a minimum dilution of 1:100.
Article 180 – TREATMENT PRIOR TO SEA OUT FALL DISCHARGE.  A system for the
prior treatment of waste water shall be designed, constructed and operated which, coupled with initialdilution, dispersion, assimilation and decay, guarantees compliance with the receiver quality
objectives contained in the environmental and health legislation in force and any amendments,
extensions or replacements thereof.
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