From a recent CBS CHANNEL 2/KCAL 9 report:
Heavy rains in Southern California have washed away a chemical that had contaminated a proposed luxury-home development in the San Fernando Valley.
Just days before an official cleanup project was to begin, state toxic officials have found that all the perchlorate is gone.
Last fall, inspectors found the chemical that is used in rocket fuel was in Dayton Canyon Creek at a concentration about 166 times higher than the state allows.
After the New Year's storms drenched the site with water, they found none.
Reminds one of the old saying, "the solution to pollution is dilution".
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Posted by: Jesse | June 12, 2012 at 10:45 AM
Gee, doesn't take a genius to realize that dilution by stormwater is a fact of life in January. However, I think that when the rains stop, the proportion of direct runoff - i.e. rainwater in the creek will drop and the chances for springwater being the source of the water that is there increases.
So sampling would only really be comparable if it was taken at the same time of the year. And heavy rains might skew sampling data dramatically.
And, with any sampling, it's an age old rule that any one 'good' sampling event can never be used to 'prove' safety. Its just one data point.
However, one very 'bad' sampling event can tell you with 100% certainty that there is a problem.
That is basic logic. Think about it a bit and you'll understand why.
When its raining, the clean rain is of course going to dilute the toxic stuff in the groundwater.
But it doesn't rain forever. certainly not in California where it basically rains only in the winter, and not at all in the summer and fall.
Posted by: Sorry, Anonymous for now.. | August 01, 2006 at 04:44 PM