Monitoring is done to identify, quantify, and track contaminants and to determine where and when corrective action should take place. At least three wells, one upgradi-

ent and two downgradient, should be maintained, and the well water should be tested at specified intervals. Most sites have more than three wells; the applicable regulations vary by state. Monitoring is conducted before, during, and after the landfill operating period. Remedial action is required when downgradient water quality is significantly worse than upgradient water quality.

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