Performance Standards
Total site area | = | _____ acres | |
- | _____ acres | ||
Base site area | = | _____ acres |
Resource | 1. Open Space Ratio | 2. Acres of Land in Resources | 3. Resource Protection Land (acres x open space ratio) | |
|---|---|---|---|---|
Floodplains | 1.00 | |||
Floodplain soils | 1.00 | |||
Lakes and ponds | 1.00 | |||
Riparian buffer | 1.00 | |||
Watercourses | 1.00 | |||
Wetlands | 1.00 | |||
Wetland margin | 0.80 | |||
Lake and pond shore | 0.70 | |||
Steep slope 25% + | 0.85 | |||
Steep slope 15% + | 0.70 | |||
Woodland | 0.50 | |||
Land with resource restrictions | _____ acres | |||
Resource protection land (Total of Column 3) | _____ acres |
Base site area | _____ acres | ||
Subtract land with resource restrictions | - | _____ acres | |
Remainder | = | _____ acres | |
Multiply by 0.2 | x | _____ acres | |
Recreation land | = | _____ acres |
Resource protection land | _____ acres | ||
Add recreation land | + | _____ acres | |
Resource protection and recreation land | = | _____ acres |
Base site area | _____ acres | ||
Multiply by open space ratio | x | _____ acres | |
Standard minimum open space | = | _____ acres |
_____ acres |
Resource-protection and recreation land | _____ acres | ||
Subtract standard minimum open space | - | _____ acres | |
Unusable land | = | _____ acres | |
(Enter zero if calculation is less than zero) |
Base site area | _____ acres | ||
Subtract unusable land | - | _____ acres | |
Net buildable site area | = | _____ acres |
For nonresidential uses, skip to the next step. | |||
Net buildable site area | _____ acres | ||
Multiply by maximum density | x | _____ acres | |
Number of dwelling units | = | _____ acres | |
(Do not round up) | |||
Net buildable site area | _____ acres | ||
Multiply by maximum impervious surface ratio | x | _____ acres | |
Impervious surfaces | = | _____ acres |
Base site area | _____ acres | ||
Subtract required open space | — | _____ acres | |
Buildable portion of the site | = | _____ acres |
Class | Option | ||
|---|---|---|---|
A | (1) | 1 canopy tree per 40 feet on the boundary of the buffer, plus 1 ornamental tree per 60 feet, arranged within the buffer | |
(2) | 1 canopy tree per 40 feet, arranged within the buffer, plus a hedge on the boundary of the buffer (planted on 3-foot centers) | ||
(3) | 1 canopy tree per 40 feet, plus 1 evergreen tree per 30 feet, arranged within the buffer yard | ||
B | (1) | 1 evergreen tree per 20 feet, arranged within the buffer, plus a hedge on the boundary of the buffer (planted on 3-foot centers) | |
(2) | 1 evergreen tree per 25 feet, arranged within the buffer, plus a berm averaging 4 feet high on the boundary of the buffer | ||
(3) | 1 evergreen tree per 25 feet, arranged within the buffer, plus one Shrub A per 8 feet on the boundary of the buffer | ||
(4) | 1 evergreen tree per 20 feet, arranged within the buffer, plus 1 shrub from Category B per 4 feet on the boundary of the buffer | ||
C | (1) | 1 hedgerow on the lot line, planted on 3-foot centers | |
(2) | A 6-foot-high cedar or spruce fence on the lot line | ||
Type | Size (inches caliper) | ||
|---|---|---|---|
Canopy trees | Acer ginnala — Amur maple | 1 1/2 | |
Acer plantanoides — Norway maple | 1 1/2 | ||
Acer rubrum — Red maple | 1 1/2 | ||
Acer saccharum — Sugar maple | 1 1/2 | ||
Fagus grandifolia — American beech | 1 1/2 | ||
Fagus sylvatica — European beech | 1 1/2 | ||
Gleditsia triacanthos inermis — Locust | 1 1/2 | ||
Liqudamber styraciflua “Rotundilba” — Sweetgum | 1 1/2 | ||
Liriodendron tulipifera — Tulip tree | 1 1/2 | ||
Phellondendron amurense — Amur corktree | 1 1/2 | ||
Plantanus acerifolia — London plane tree | 1 1/2 | ||
Quercus alba — White oak | 1 1/2 | ||
Quercus borealis — Red oak | 1 1/2 | ||
Quercus coccinea — Scarlet oak | 1 1/2 | ||
Quercus palustris — Pin oak | 1 1/2 | ||
Quercus phellos — Willow oak | 1 1/2 | ||
Robina psuedoacacia inermis — Locust | 1 1/2 | ||
Sophora japonica — Japanese pagodatree | 1 1/2 | ||
Tilia-linden — All species hardy to the area | 1 1/2 | ||
Zelkova serrata — Japanese zelkova | 1 1/2 | ||
Ornamental | Amelanchier canadensis — Shadblow | 5 to 6 feet | |
Betula alba — European white birch | 1 1/2 | ||
Betula papyrifera — Paper birch | 1 1/2 | ||
Cornus florida — Flowering dogwood | 5 to 6 feet | ||
Cornus mas — Cornelian cherry | 5 to 6 feet | ||
Crataegus phaenopyrum — Washington hawthorn | 5 to 6 feet | ||
Koelreuteria paniculata — Goldenrain tree | 8 to 10 feet | ||
Laburnum vossi — Golden chain | 1 1/2 | ||
Magnolia soulangeana — Saucer magnolia | 5 to 6 feet | ||
Magnolia virginiana — Sweet bay | 5 to 6 feet | ||
Malus baccata — Siberian crab | 1 1/2 | ||
Malus floribunda — Japanese flowering crab | 1 1/2 | ||
Malus hopa — Hopa red-flowering crab | 1 1/2 | ||
Oxydendrum arboreum — Sourwood | 5 to 6 feet | ||
Pyrus calleryana Bradford — Callery pear | 1 1/2 | ||
Prunus kwanzan — Kwanzan cherry | 1 1/2 | ||
Prunus yedoensis — Yoshino cherry | 1 1/2 | ||
Evergreen 4 to 5 feet | Ilex opaca — American holly | ||
Picea abies — Norway spruce | |||
Picea omorika — Siberian spruce | |||
Picea pungens — Colorado spruce | |||
Pinus nigra — Austrian pine | |||
Pinus strobes — White pine | |||
Pseudotsuga menziesii — Douglas fir | |||
Tsuga canadensis — Canada hemlock | |||
Hedge | Crataegus intricate — Thicket hawthorn | 3 to 4 feet | |
Forsythia intermedia — Border forsythia | 4 to 5 feet | ||
Rhamnus frazula columnaris — Tallhedge buckthorn | 3 to 4 feet | ||
Syringa chinensis — Chinese lilac | 3 to 4 feet | ||
Syringa vulgaris — Common lilac | 4 to 5 feet | ||
Viburnum alatus — Viburnum | 4 to 5 feet | ||
Hedgerow | Buxus — Boxwood | 4 to 5 feet | |
Pyracantha laland — Laland fire thorn | 5 to 6 feet | ||
Juniperus verginiawa — Upright juniper | 4 to 5 feet | ||
Cotoneaster divaricata — Spreading cotoneaster | 3 to 3 1/2 feet | ||
Rhamnus frangula-columnaris — Tall hedge buckthorn | 5 to 6 feet | ||
Shrubs A | Junierus virginiana — Upright juniper | 4 to 5 feet | |
Pyracantha laland — Laland fire thorn | 5 to 6 feet | ||
Taxus capitata — Upright yew | 2 to 3 feet | ||
Taxus hicksi — Hicks yew | 2 to 3 feet | ||
Thuja occidentalis — American arborvitae | 4 to 5 feet | ||
Shrubs B | Euonymus alatus — Winged euonymus | 3 to 4 feet | |
Hamamelis vernalis — Vernal witch hazel | 4 to 5 feet | ||
Hamamelis virginiana — Common witch hazel | 4 to 5 feet | ||
Ilex verticillata — Winterberry | 4 to 5 feet | ||
Rharmnus frangula — Glossy buckthorn | 4 to 5 feet | ||
Viburnum dentatum — Arrowood virburnum | 4 to 5 feet |
Total Sound Level Minus Ambient Sound Level | Correction Factor to be Subtracted from Total Sound Level | |
|---|---|---|
10 | 0 | |
9 | 1 | |
8 | 1 | |
7 | 1 | |
6 | 1 | |
5 | 2 | |
4 | 2 | |
3 | 3 | |
2 | 4 | |
1 | 7 |
Table 1 Continuous Sound Levels by Receiving Land Use | |||||
|---|---|---|---|---|---|
Receiving Land Use Category | Time | Sound Level Limit (dBA) | |||
Residential, public space, open space, agricultural, or institutional | 7:00 a.m. to 10:00 p.m. | 55 | |||
10:00 p.m. to 7:00 a.m., plus Sundays and legal holidays | 50 | ||||
Office, commercial or business | 7:00 a.m. to 10:00 p.m. | 65 | |||
10:00 p.m. to 7:00 a.m., plus Sundays and legal holidays | 60 | ||||
Industrial | At all times | 70 | |||
Performance Standards
Total site area | = | _____ acres | |
- | _____ acres | ||
Base site area | = | _____ acres |
Resource | 1. Open Space Ratio | 2. Acres of Land in Resources | 3. Resource Protection Land (acres x open space ratio) | |
|---|---|---|---|---|
Floodplains | 1.00 | |||
Floodplain soils | 1.00 | |||
Lakes and ponds | 1.00 | |||
Riparian buffer | 1.00 | |||
Watercourses | 1.00 | |||
Wetlands | 1.00 | |||
Wetland margin | 0.80 | |||
Lake and pond shore | 0.70 | |||
Steep slope 25% + | 0.85 | |||
Steep slope 15% + | 0.70 | |||
Woodland | 0.50 | |||
Land with resource restrictions | _____ acres | |||
Resource protection land (Total of Column 3) | _____ acres |
Base site area | _____ acres | ||
Subtract land with resource restrictions | - | _____ acres | |
Remainder | = | _____ acres | |
Multiply by 0.2 | x | _____ acres | |
Recreation land | = | _____ acres |
Resource protection land | _____ acres | ||
Add recreation land | + | _____ acres | |
Resource protection and recreation land | = | _____ acres |
Base site area | _____ acres | ||
Multiply by open space ratio | x | _____ acres | |
Standard minimum open space | = | _____ acres |
_____ acres |
Resource-protection and recreation land | _____ acres | ||
Subtract standard minimum open space | - | _____ acres | |
Unusable land | = | _____ acres | |
(Enter zero if calculation is less than zero) |
Base site area | _____ acres | ||
Subtract unusable land | - | _____ acres | |
Net buildable site area | = | _____ acres |
For nonresidential uses, skip to the next step. | |||
Net buildable site area | _____ acres | ||
Multiply by maximum density | x | _____ acres | |
Number of dwelling units | = | _____ acres | |
(Do not round up) | |||
Net buildable site area | _____ acres | ||
Multiply by maximum impervious surface ratio | x | _____ acres | |
Impervious surfaces | = | _____ acres |
Base site area | _____ acres | ||
Subtract required open space | — | _____ acres | |
Buildable portion of the site | = | _____ acres |
Class | Option | ||
|---|---|---|---|
A | (1) | 1 canopy tree per 40 feet on the boundary of the buffer, plus 1 ornamental tree per 60 feet, arranged within the buffer | |
(2) | 1 canopy tree per 40 feet, arranged within the buffer, plus a hedge on the boundary of the buffer (planted on 3-foot centers) | ||
(3) | 1 canopy tree per 40 feet, plus 1 evergreen tree per 30 feet, arranged within the buffer yard | ||
B | (1) | 1 evergreen tree per 20 feet, arranged within the buffer, plus a hedge on the boundary of the buffer (planted on 3-foot centers) | |
(2) | 1 evergreen tree per 25 feet, arranged within the buffer, plus a berm averaging 4 feet high on the boundary of the buffer | ||
(3) | 1 evergreen tree per 25 feet, arranged within the buffer, plus one Shrub A per 8 feet on the boundary of the buffer | ||
(4) | 1 evergreen tree per 20 feet, arranged within the buffer, plus 1 shrub from Category B per 4 feet on the boundary of the buffer | ||
C | (1) | 1 hedgerow on the lot line, planted on 3-foot centers | |
(2) | A 6-foot-high cedar or spruce fence on the lot line | ||
Type | Size (inches caliper) | ||
|---|---|---|---|
Canopy trees | Acer ginnala — Amur maple | 1 1/2 | |
Acer plantanoides — Norway maple | 1 1/2 | ||
Acer rubrum — Red maple | 1 1/2 | ||
Acer saccharum — Sugar maple | 1 1/2 | ||
Fagus grandifolia — American beech | 1 1/2 | ||
Fagus sylvatica — European beech | 1 1/2 | ||
Gleditsia triacanthos inermis — Locust | 1 1/2 | ||
Liqudamber styraciflua “Rotundilba” — Sweetgum | 1 1/2 | ||
Liriodendron tulipifera — Tulip tree | 1 1/2 | ||
Phellondendron amurense — Amur corktree | 1 1/2 | ||
Plantanus acerifolia — London plane tree | 1 1/2 | ||
Quercus alba — White oak | 1 1/2 | ||
Quercus borealis — Red oak | 1 1/2 | ||
Quercus coccinea — Scarlet oak | 1 1/2 | ||
Quercus palustris — Pin oak | 1 1/2 | ||
Quercus phellos — Willow oak | 1 1/2 | ||
Robina psuedoacacia inermis — Locust | 1 1/2 | ||
Sophora japonica — Japanese pagodatree | 1 1/2 | ||
Tilia-linden — All species hardy to the area | 1 1/2 | ||
Zelkova serrata — Japanese zelkova | 1 1/2 | ||
Ornamental | Amelanchier canadensis — Shadblow | 5 to 6 feet | |
Betula alba — European white birch | 1 1/2 | ||
Betula papyrifera — Paper birch | 1 1/2 | ||
Cornus florida — Flowering dogwood | 5 to 6 feet | ||
Cornus mas — Cornelian cherry | 5 to 6 feet | ||
Crataegus phaenopyrum — Washington hawthorn | 5 to 6 feet | ||
Koelreuteria paniculata — Goldenrain tree | 8 to 10 feet | ||
Laburnum vossi — Golden chain | 1 1/2 | ||
Magnolia soulangeana — Saucer magnolia | 5 to 6 feet | ||
Magnolia virginiana — Sweet bay | 5 to 6 feet | ||
Malus baccata — Siberian crab | 1 1/2 | ||
Malus floribunda — Japanese flowering crab | 1 1/2 | ||
Malus hopa — Hopa red-flowering crab | 1 1/2 | ||
Oxydendrum arboreum — Sourwood | 5 to 6 feet | ||
Pyrus calleryana Bradford — Callery pear | 1 1/2 | ||
Prunus kwanzan — Kwanzan cherry | 1 1/2 | ||
Prunus yedoensis — Yoshino cherry | 1 1/2 | ||
Evergreen 4 to 5 feet | Ilex opaca — American holly | ||
Picea abies — Norway spruce | |||
Picea omorika — Siberian spruce | |||
Picea pungens — Colorado spruce | |||
Pinus nigra — Austrian pine | |||
Pinus strobes — White pine | |||
Pseudotsuga menziesii — Douglas fir | |||
Tsuga canadensis — Canada hemlock | |||
Hedge | Crataegus intricate — Thicket hawthorn | 3 to 4 feet | |
Forsythia intermedia — Border forsythia | 4 to 5 feet | ||
Rhamnus frazula columnaris — Tallhedge buckthorn | 3 to 4 feet | ||
Syringa chinensis — Chinese lilac | 3 to 4 feet | ||
Syringa vulgaris — Common lilac | 4 to 5 feet | ||
Viburnum alatus — Viburnum | 4 to 5 feet | ||
Hedgerow | Buxus — Boxwood | 4 to 5 feet | |
Pyracantha laland — Laland fire thorn | 5 to 6 feet | ||
Juniperus verginiawa — Upright juniper | 4 to 5 feet | ||
Cotoneaster divaricata — Spreading cotoneaster | 3 to 3 1/2 feet | ||
Rhamnus frangula-columnaris — Tall hedge buckthorn | 5 to 6 feet | ||
Shrubs A | Junierus virginiana — Upright juniper | 4 to 5 feet | |
Pyracantha laland — Laland fire thorn | 5 to 6 feet | ||
Taxus capitata — Upright yew | 2 to 3 feet | ||
Taxus hicksi — Hicks yew | 2 to 3 feet | ||
Thuja occidentalis — American arborvitae | 4 to 5 feet | ||
Shrubs B | Euonymus alatus — Winged euonymus | 3 to 4 feet | |
Hamamelis vernalis — Vernal witch hazel | 4 to 5 feet | ||
Hamamelis virginiana — Common witch hazel | 4 to 5 feet | ||
Ilex verticillata — Winterberry | 4 to 5 feet | ||
Rharmnus frangula — Glossy buckthorn | 4 to 5 feet | ||
Viburnum dentatum — Arrowood virburnum | 4 to 5 feet |
Total Sound Level Minus Ambient Sound Level | Correction Factor to be Subtracted from Total Sound Level | |
|---|---|---|
10 | 0 | |
9 | 1 | |
8 | 1 | |
7 | 1 | |
6 | 1 | |
5 | 2 | |
4 | 2 | |
3 | 3 | |
2 | 4 | |
1 | 7 |
Table 1 Continuous Sound Levels by Receiving Land Use | |||||
|---|---|---|---|---|---|
Receiving Land Use Category | Time | Sound Level Limit (dBA) | |||
Residential, public space, open space, agricultural, or institutional | 7:00 a.m. to 10:00 p.m. | 55 | |||
10:00 p.m. to 7:00 a.m., plus Sundays and legal holidays | 50 | ||||
Office, commercial or business | 7:00 a.m. to 10:00 p.m. | 65 | |||
10:00 p.m. to 7:00 a.m., plus Sundays and legal holidays | 60 | ||||
Industrial | At all times | 70 | |||