Anchor: EFFLUENT AND RECEIVING WATER SAMPLING, SAMPLE HANDLING, AND SAMPLE PREPARATION FOR TOXICITY TESTS
Entailed: Toxicity tests require various steps involving water. 
Contradiction: Toxicity tests do not produce any viable results. 
Contradiction: It remains closed to visitors for the time being.
Contradiction: People live in a poor nation.
Contradiction: people listening to the radio
Contradiction: It sounded simple to me.