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.
Water containing sodium salts (soft water) is more corrosive than water containing calcium or magnesium salts (hard water), because hard water minerals tend to coat the inside of pipes and reduce the potential for corrosion. Several different types of metals are often used in a plumbing system.