Explanation
The percentage of diverted waste for Materials and Resources Credit, Construction and Demolition Waste Management is calculated by dividing the total weight of diverted materials by the total weight of waste generated1. Diverted materials are those that are reused, recycled, salvaged, or donated2. In this case, the total weight of diverted materials is:
* 8 tons (7.3 tonnes) of recycled demolition steel and concrete
* 6 tons (5.4 tonnes) of used furniture donated to a non-profit organization
* 1 ton (0.9 tonnes) of removed carpet and ceiling tiles sent back to the manufacturer
* 40% of 3 tons (2.7 tonnes) of commingled scrap, which is 1.2 tons (1.1 tonnes) The sum of these weights is 16.2 tons (14.7 tonnes). The total weight of waste generated is 20 tons (18.1 tonnes). Therefore, the percentage of diverted waste is:
(16.2 / 20) x 100 = 81%
However, the credit allows for a 10% adjustment for vegetative waste, which is not considered a building material3. Therefore, the percentage of diverted waste after adjustment is:
(81 - 10) = 71%
The closest answer option to this value is B. 75%.
References:
* Construction and Demolition Waste Management
* Construction Waste Management
* Construction and Demolition Waste Management - Canada Green Building Council