We are a couple of blocks from the river, using a dug well that is only 14 feet deep.... The entire valley is river gravel, so the level of the water table is basically the level of the river.... In the spring, our sump-pump runs every couple of minutes, and it's only about 4 feet below grade.... I agree that the gravel bed will likely filter out all the particulate matter no problem.... my only concerns is other contaminants that are water soluable and could travel through the gravel and into our well.... I sent the photos to Global TV, you never know it might be on the News tonight.... I am also concerned about the health of the river itself, of course.... it could be very bad for the ecosystem....

Bob