Page 84 - The Engineering Guide to LEED-New Construction Sustainable Construction for Engineers

LEED Sustainable Sites 65

Criteria for Most Sites Urban Sites That Also Earn SSc2
Credit point WETNAT + LSNAT + LSNAP WETNAT + LSNAT + LSNAP + VNAPR
≥ Maximum of [0.5(A − BF) or 0.2 A ] ≥ Maximum of [0.5(A − BF) or 0.2 A ]
T T T T
EP point WETNAT + LSNAT + LSNAP WETNAT + LSNAT + LSNAP + VNAPR
≥ Maximum of [0.75(A − BF) or ≥ Maximum of [0.75(A − BF) or 0.3 A ]
T T T
0.3 A ]
T
TABLE 2.5.1 Summary of Protected/Restored Habitat Areas for Previously Developed Sites LEED 2009

Note that projects earning SS Credit 2 (Development Density and Community
Connectivity) and having vegetated roof surfaces may use these vegetated roof areas in
the calculation of the total of the areas restored or protected if these vegetated roof areas
meet the native/adapted species criteria. Otherwise, the vegetated roof surfaces are not
included. Raised planters were not specifically addressed in LEED-NC 2.2, but it is
assumed that they too may count for urban areas, earning SSc2 if appropriately planted,
but not for other projects. By raised planters, the author is referring to decorative
planters that are substantially raised from the ground surface, not curbed landscape
areas. Curbed landscape areas should count in all cases if appropriately planted.
The requirements for previously developed sites can be summarized using the
following additional definitions and sets of equations and are summarized in Table 2.5.1.
LSNAP Represents all the previously disturbed areas on the ground that are
replanted with native and adapted plants
VNAPR Represents all the roofed areas that are planted with native and adapted plants
One point is earned for most previously developed sites if the following is true:

WETNAT + LSNAT + LSNAP ≥ Maximum of [0.5 × (A − BF) or 0.2 A ] (2.5.1)
T T
or for the previously developed urban sites where SSc2 is also earned, the following is true:
WETNAT + LSNAT + LSNAP + VNAPR ≥ Maximum of [0.5 × (A − BF) or 0.2 A ] (2.5.2)
T T
Special Circumstances and Exemplary Performance
If the project site contains both greenfield areas and previously developed areas, then
these areas must each conform to the requirements of Case 1 and Case 2, respectively.
The previously developed sites may be awarded one point for exemplary performance
if the restored/protected areas total more than 75 percent of the project area, excluding
the building footprint, or as further required in LEED 2009, 30 percent of the total project
area, whichever is greater.
An additional exemplary performance point is earned for most previously developed
sites if
WETNAT + LSNAT + LSNAP ≥ Maximum of [0.75 × (A − BF) or 0.3 A ] (2.5.3)
T T
or for the previously developed urban sites where SSc2 is also earned, the following is true:
WETNAT + LSNAT + LSNAP + VNAPR ≥ Maximum of [0.75 × (A − BF) or 0.3 A ]
T T
(2.5.4)