You have three wells. Well 1 has sewage contamination and has elevated levels of chloride at 800mg/Liter and arsenic at 4mg/Liter. There is an uncontaminated background well (Well 2) with Chloride levels at 100mg/Liter and arsenic at 0.1mg/Liter. Well 3 is located down gradient of the contaminated area with a Chloride level of 300mg/liter.
1) If the Arsenic concentration for Well 3 is 0.8mg/Liter, what would the retardation coefficient be for arsenic?
2) What would be the mixing fraction for Well 3? Note the contamination component with the letter "p".