was sampling
Question 4 If the chemical is known to be present naturally in the area, such as the minerals calcium or arsenic, was sampling sufficient to determine whether levels are unusually high? | Pregunta 4 Si se sabe que la sustancia química está presente naturalmente en la zona, como los minerales calcio o arsénico, ¿fue el muestreo suficiente para determinar si los niveles eran inusualmente altos? |
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