A facility is conditionally exempt from silver recovery requirements if it generates less than 500 gallons per month of silver-containing solution which is: 1) hazardous only for silver 2) treated on-site within 90 days 3) silver concentration is reduced to less than 5 mg/L. Which statements are correct?

A facility is conditionally exempt from silver recovery requirements if it generates less than 500 gallons per month of silver-containing solution which is: 1) hazardous only for silver 2) treated on-site within 90 days 3) silver concentration is reduced to less than 5 mg/L. Which statements are correct?

• A. 1 and 2
• B. 1 and 3
• C. 2 and 3
• D. 1, 2, and 3

Answer: (D)

This conditional exemption applies only when silver-bearing waste is kept at a small scale and managed in a way that minimizes risk. The waste must be hazardous only for silver, meaning there aren’t other hazardous constituents driving the regulation. It also must be generated in a small amount—less than 500 gallons per month. In addition, on-site treatment must occur within 90 days to prevent long-term accumulation, and the silver concentration must be reduced to below 5 mg/L so the residual silver is kept at a very low level. When all three conditions are met, the facility can qualify for the exemption from the full silver recovery requirements. Therefore, all three statements are correct.

This conditional exemption applies only when silver-bearing waste is kept at a small scale and managed in a way that minimizes risk. The waste must be hazardous only for silver, meaning there aren’t other hazardous constituents driving the regulation. It also must be generated in a small amount—less than 500 gallons per month. In addition, on-site treatment must occur within 90 days to prevent long-term accumulation, and the silver concentration must be reduced to below 5 mg/L so the residual silver is kept at a very low level. When all three conditions are met, the facility can qualify for the exemption from the full silver recovery requirements. Therefore, all three statements are correct.