I'm hoping someone can make this requirement interpretation crystal clear for me as I'm struggling to fully grasp what it mean. Assume all project space was initially greenfield. Assume a 1000sqft greenfield space initially existing for simplicity sake. 50% or 500 sqft will ultimately incorporate the building and parking lot after construction. 

Does the stated requirement for this credit mean that for any Greenfield area on the project site 400sqft (40%) of that area can't so much as be driven on or disturbed in any way whatsoever by construction equipment or temporary stored placement of materials/equipment? Would a project essentially need to build a fence around 400sqft of onsite greenfield to comply to ensure it's not touched during construction to comply?

...OR can the requirement be interpreted as: If 700sqft (70%) of the initial greenfield space was disturbed in some capacity during construction for the building and construction process so a min of 100sqft would need to be restored afterwards to bring that initial requirement of 40% being preserved and protected back into compliance?