Jackie Young-Medcalf, executive director and founder of the Texas Health and Environment  Alliance, a nonprofit that aims to inform and protect communities affected by toxic waste sites, stares hard at the water moving toward the waste pits, knowing it will flow into local well lines and flood the ground during hurricanes and tropical storms. Environmental activist isn’t a role the 33-year-old former model and beauty queen ever expected to play. If it weren’t for these waste pits, her life might have been entirely different.