A Cow's tender had rinsed fertilizer residue into water trough after the spreading fertilizers on his ranch. About 3 gallons of water remained in the water trough when the irrigation specialists arrived. The water trough sample taken for analysis was obtained after the 3 gallons were diluted to 1,000gallons. Determine the concentration of nitrates in water trough the prior to refilling. When the concentration of the water trough was 5,000ppm.