In this Sept. 13, 2017 photo, a boat with a dive flag is shown at San Jacinto River Waste Pits near the Interstate 10 bridge over the river in Channelview, Texas. The Environmental Protection Agency says an unknown amount of a dangerous chemical linked to birth defects and cancer may have washed downriver from a Houston-area Superfund site during the flooding from Hurricane Harvey. (AP Photo/David J. Phillip)
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