Toxic Water Numbers Days of a Trailer Park
Residents of trailer park near Plaquemine, La, are being forced to move because of poison in well water they use to drink, cook and bathe; residents, many of whom have lived in park for decades, were not told what state knew for years, that aquifer near Plaquemine contains vinyl chloride, toxic chemical used to make plastic; health experts warn that exposure to this colorless chemical could cause cancer, nerve damage, circulatory problems and skin lesions; scientists are unsure just how toxic it is because incidents of drinking or bathing in such contaminated water are so rare; women living in trailer park say many of them had miscarriages; Louisiana Dept of Health and Hospitals first detected contamination in 1997, but failed to tell people there about it; state officials cite 'human error'; now state and federal authorities have launched criminal investigation, and state has empaneled its first grand jury ever on environmental issue; residents of trailer park blame Dow chemical plant nearby, but Dow officials say their plant is not source of pollution; residents are suing Dept of Health and Hospitals, trailer park owner and Dow; photos; map (L)