In 1999, Huntington Beach in California had to be closed due to fecal contamination problem. Immediately there was a series of surveys to determine the source of pollution. This home was in the Santa Ana River water around the river waters, embracing an urban area, a power plant and a reclaimed marsh as a bird sanctuary (Talbert Marsh). Below is a map indicating contaminated water pipes to the river and the sampling stations (numbered circles).
In urban areas of the United States, the storm water network is separated from the network of black water (sewage). Additionally, the sewage is treated before being discharged into the Santa Ana River
The results of microbial contamination of the samples were as follows (numbers in CFU per 100 milliliters).
The results of microbial contamination of the samples were as follows (numbers in CFU per 100 milliliters).
addition, a sampling of fecal microorganisms over several days at station 4 and it was found that:
Microbiologists postulated a hypothesis about the origin but this hypothesis did not convince the city council. It was decided to conduct a more comprehensive series of samples and after they were unable to determine exactly where the pollution occurred. It was found that the initial hypothesis was that by microbiologists correct.
Where contamination originated?
What data supports this conclusion?
Why is an oscillating pattern in station number 4?
Where contamination originated?
What data supports this conclusion?
Why is an oscillating pattern in station number 4?
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