Page 80 - The Engineering Guide to LEED-New Construction Sustainable Construction for Engineers

LEED Sustainable Sites 61

than the building type’s average listed in the document by the Institute of Transportation
Engineers (ITE) entitled Parking Generation, Third Edition, Washington, D.C., 2004.
For example, in one municipality, a sit-down restaurant use may require a minimum
of one-half parking space for each customer seat (most people go to restaurants in groups)
plus one for each employee in a shift. The maximum may allow for an increase of 25
percent over this, which is reasonable based on customers who may wish to wait for
service. Other zoning codes may have the formula for a similar use based on gross floor
area or customer floor area. To obtain zoning approval, the designers must meet this
minimum requirement unless they have a valid reason to ask for a variance. If a variance
is granted from the minimum by the local municipal planning organization (MPO), then
this should be included in the submittal documents. An example of a valid reason for a
lower than minimum total parking may be the availability of shared parking off-site.

LEED 2009 Case 1 Option 1 Case 1 Option 1 for credit SSc4.4, is for nonresidential
construction and has two requirements. The first is that the total number of parking
spaces (TP) does not exceed the required zoning minimum as previously defined. The
second requirement in Option 1 for credit SSc4.4 is to designate the minimum number
of preferred parking spaces for carpools or vanpools (CVPP1) for 5 percent of the total
provided parking spaces as given in Eq. (2.4.12).
CVPP1 = 0.05 × TP (2.4.12)

The minimum number of preferred parking spaces for carpools or vanpools (CVPP1)
must always be a whole number, and any fractional calculations must be rounded up to
the next-higher whole number. Alternatively, instead of providing these spaces, discounted
parking passes may be available for all carpools or vanpools as previously noted.
The submittals for Option 1 of credit SSc4.4 should include the zoning calculations
for minimum required parking to obtain the total parking (or the appropriate alternative
method based on the Portland, Ore., zoning code or the ITE report in LEED 2.2) and the
calculation of the minimum number of preferred parking spaces for carpools or
vanpools (CVPP1). A plan should be submitted showing both the total number of
parking spaces (TP) and the location of at least the minimum number of preferred
parking spaces for carpools or vanpools (CVPP1) as appropriately marked in relation to
the other parking spaces and the entrance. Again, instead of providing these spaces,
discounted parking passes may be available for all carpools or vanpools as previously
noted and provisions for this verified in the submittal.
LEED 2009 Case 1 Option 2 Case 1 Option 2 of credit SSc4.4 for nonresidential uses, is
similar to Case 1 Option 1 but is for the special case where very little parking is provided,
perhaps representing projects in areas with well-established mass transit or other
transportation and parking opportunities. The submittals should first establish that the
total parking provided (TP) is less than 5 percent of the FTE building occupants and then
provide the calculation for the minimum number of preferred parking spaces for carpools
or vanpools (CVPP2) as given in Eq. (2.4.13) and an area map showing their location.
CVPP2 = 0.05 × TP (2.4.13)

The minimum number of preferred parking spaces for carpools or vanpools (CVPP2)
must always be a whole number, and any fractional calculations must be rounded up to
the next-higher whole number. Again, instead of providing these spaces, discounted