1.   During the event, extensive water quality samples were taken to assess the degree of pollution.

2.   This links via a Wide Area Network to the laboratory which processes water samples.

3.   Further water samples will be tested today when supplies are expected to be back to normal.

4.   Also on Saturday, search boats placed wreaths on the water at the request of families, and collected water samples for the families to take home.

5.   A month later, the concentration of both chlorides and sulfates inexplicably doubled in new water samples.

6.   But now, electronic devices can analyze the water sample and identify extremely small amounts of chemical pollutants in concentrations of as little as a few parts per billion.

7.   City employees take water samples from throughout the five boroughs each day for testing.

8.   City workers collect dozens of water samples for testing from designated sites from hydrants to restaurant faucets around the five boroughs every day.

9.   Each day, city collectors take water samples for laboratory analysis.

10.   Essentially it consists of collecting a water sample, then adding a reagent.