We had seen that the Armstrong World HQ in Lancaster, PA had achieved an ID credit for acoustic performance utilizing sound absorbing materials, furniture and a sound masking system.

LEED 2009 for Schools has EQp3 and EPc9 which both address acoustic performance.

How can a project pursuing LEED 2009 CI include acoustic performance as a path to an ID credit? Is there a summary of criteria that would be required based on the prior ID credit that Armstrong had achieved?

Thanks for any guidance!