20231140 Ver 1_230808_The Institute - Impervious Surface Increase Calculation_20230814

existing site footprint = 1.86 acres (per Wake County GIS)
1.86 acres = 81,022 sq ft.
existing impervious surface = 36,668 sq ft.
existing % impervious = (existing impervious surfaces / existing site footprint) * (100)
(36,668 sq ft. / 81,022 sq ft.)*(100) = 45
new impervious surface total = existing impervious surface + proposed impervious surface
36,668 sq ft. + 933 sq. ft. = 37,601 sq ft.
new % impervoius = (new impervious surface / existing site footprint) * (100)
(37,601 sq ft. / 81,022 sq ft.) * (100) = 46
*overall increase in impervious surface (stormwater runoff potential) = 1
1 % < 10% maximum required for exemption per Raleigh LIDO 9.2.2.E.2.b
*note: existing impervious surface footprint based off as -built survey by BNK consulting engineers 05/13/1991
SITE PLAN LEGEND
0 oveallsite
I� ew loos
0 loos
The Institute I Buffer Authorization Info - G003
1 8/8/23
�a E__cTS