Sustainable Sites (Continued)
Reduced Site Disturbance (1)
Conserve existing natural areas and restore damaged areas to provide habitat and promote biodiversity.
On greenfield sites, limit site disturbance including earthwork and clearing of vegetation to 40 feet beyond
the building perimeter, 5 feet beyond primary roadway curbs, walkways, and main utility branch trenches,
and 25 feet beyond pervious paving areas that require additional staging areas in order to limit compaction in
the paved area; OR, on previously developed sites, restore a minimum of 50% of the remaining open area
by planting native or adapted vegetation.
Reduce the development footprint (including building, access roads and parking) to exceed the
installation/base's/base's master plan local zoning's open space requirement for the site by 25% or in
accordance with installation/base policy on open space set asides, whichever is greater.
Note requirements on plans and in specifications. Establish contractual penalties for destruction of trees and site
areas noted for protection. Reduce footprints by tightening program needs and stacking floor plans. Establish
clearly marked construction and disturbance boundaries. Delineate laydown, recycling, and disposal areas. Use
areas to be paved as staging areas. Work with local horticultural extension services, native plant societies, or
installation/base agronomy staff to select indigenous plant species for site restoration and landscaping.
Stormwater Management (1)
Limit disruption of natural water flows by minimizing storm water runoff, increasing on-site infiltration and reducing
Implement a stormwater management plan that results in:
No net increase in the rate or quantity of stormwater runoff from undeveloped to developed conditions; OR, if
existing imperviousness is greater than 50%, implement a stormwater management plan that results in a
25% decrease in the rate and quantity of stormwater runoff.
Treatment systems designed to remove 80% of the average annual post development total suspended solids
(TSS), and 40% of the average annual post development total phosphorous (TP), by implementing Best
Management Practices (BMPs) outlined in EPA's Guidance Specifying Management Measures for Sources
of Nonpoint Pollution in Coastal Waters (EPA-840-B-92-002 1/93).
Significantly reduce impervious surfaces, maximize on-site stormwater infiltration, and retain pervious and
vegetated areas. Capture rainwater from impervious areas of the building for groundwater recharge or reuse
within building. Use green/vegetated roofs. Utilize biologically-based and innovative stormwater management
features for pollutant load reduction such as constructed wetlands, stormwater filtering systems, bioswales, bio-
retention basins, and vegetated filter strips. Use open vegetated swales to reduce drainage velocity and erosion,
reduce system maintenance, increase vegetative variety and support wildlife habitat where space permits.
Landscape and Exterior Design to Reduce Heat Islands
Reduce heat islands (thermal gradient differences between developed and undeveloped areas) to minimize
impact on microclimate and human and wildlife habitat.
Provide shade (within 5 years) on at least 30% of non-roof impervious surface on the site, including parking
lots, walkways, plazas, etc., OR, use light-colored/ high-albedo materials (reflectance of at least 0.3) for 30%
of the site's non-roof impervious surfaces, OR place a minimum of 50% of parking space under-ground OR
use open-grid pavement system (net impervious area of LESS than 50%) for a minimum of 50% of the
parking lot area.
Use ENERGY STAR Roof compliant, high-reflectance AND low emissivity roofing (initial reflectance of at
least .65 and three-year-aged reflectance of at least .5 when tested in accordance with ASTM E408) for a
minimum of 75% of the roof surface; OR, install a "green" (vegetated) roof for at least 50% of the roof area.
Employ design strategies, materials, and landscaping designs that reduce heat absorption of exterior materials.
Note albedo/reflectance requirements in the drawings and specifications. Provide shade (calculated on June 21,
noon solar time) using native or climate tolerant trees and large shrubs, vegetated trellises, or other exterior
structures supporting vegetation. Substitute vegetated surfaces for hard surfaces. Explore elimination of blacktop
and the use of new coatings and integral colorants for asphalt to achieve light colored surfaces.
Adapted material not reviewed or endorsed by U. S. Green Building Council.
U. S. Green Building Council. Used by permission.
Sustainable Project Rating Tool (SPiRiT) v.1.4.1