For the scenario provided, where 30% of the infrastructure components contain post-consumer recycled content and 10% by mass are on-site reuse materials, an additional 10% of the infrastructure's mass must come from pre-consumer materials to meet the LEED requirements for recycled content.

Recycled Content Credit:The use of recycled materials in infrastructure contributes to sustainability by reducing the demand for virgin materials and minimizing waste. LEED credits are awarded based on the percentage by mass of recycled content in infrastructure materials.

Recycled Content Categories:

Post-consumer recycled contentrefers to materials recycled after they have been used by consumers, such as paper, metals, or plastics.

Pre-consumer recycled contentinvolves materials that are recycled from manufacturing waste, before they reach the consumer, such as scraps or trimmings.

Required Additional Percentage:In this scenario, the project already has 30% post-consumer and 10% on-site reuse. To maximize the recycled content credit, an additional 10% by mass of the materials must come from pre-consumer recycled content, bringing the total recycled content to 50% (30% post-consumer, 10% pre-consumer, 10% on-site reuse).

The LEED Reference Guide for Neighborhood Development details the calculations and criteria for earning recycled content credits.

TheLEED v4 Neighborhood Developmentdocumentation provides further information on the use of recycled materials in infrastructure.

Detailed Explanation:References:For more information, consult:

LEED Reference Guide for Neighborhood Development

LEED v4 Neighborhood Development