Which of the following properties must not be present in receiving waters in injurious quantities?

The correct choice pertains to properties like turbidity, color, and oil film that must not be present in injurious quantities in receiving waters. These factors can significantly affect the health of aquatic ecosystems.

Turbidity refers to the cloudiness or haziness of a fluid caused by large numbers of individual particles that are generally invisible to the naked eye. High turbidity can limit light penetration, which is essential for aquatic plants like algae. This disruption can lead to photosynthesis issues, effectively harming the entire aquatic food web.

Color, often influenced by dissolved organic material, can also indicate pollution and affect the water quality. It may interfere with the ability of aquatic organisms to find mates or food and can impact the growth of submerged aquatic vegetation.

Oil film is indicative of contamination by hydrocarbons, and even small quantities can be harmful. Oil can suffocate fish and other aquatic organisms by creating a barrier on the water surface that prevents oxygen exchange.

In summary, the properties mentioned are critical for maintaining healthy aquatic environments, and their presence in high quantities can signify pollution that poses risks to both wildlife and human uses of water resources.