St. Helens Chronicle. The St. Helens woman has been missing for two weeks. Her boyfriend, currently in the Lane County jail for other offenses, is now considered a person of interest. Police are currently searching for St. Helens woman, Cheryl Hart, who has been missing for nearly two weeks.
First, there are typically two varieties, or species, of arsenic in water: arsenic 3 and arsenic 5.. This is significant because arsenic 3 is very difficult to remove from water and must be changed or oxidized to arsenic 5 before it can be removed.
Source of Arsenic in Water: Arsenic (As) is often used in wood preservation as well as in paint and dye production. It can also be a byproduct of other industrial or agricultural processes. Arsenic can enter ground water through farm run-off or industrial waste.