SW5100602_BUA Allocations_20230526

IV. PROJECT INFORMATION
1. In the space provided below, briefly summarize .how the stormwater runoff will be treated.
The existing stormwater pond will not be modified. Only i_rrt ervious area allotment will be revised to
incorporate the new building addition.
2. a. If claiming vested rights, identify the supporting documents provided and the date they were approved:
❑ Approval of a Site Specific Development Plan or PUDApproval Date:
❑ Valid Building Permit Issued Date:
❑ Other: Date:
b. If claiming vested rights, identify the regulation(s) the project has been designed in accordance with:
❑ Coastal SW —1995 ❑ Ph II — Post Construction
3. Stormwater runoff from this project drains to the Tar -Pam River basin.
4. Total Property Area: 26.24 acres
5. Total Coastal Wetlands Area: 0 acres
6. Total Surface Water Area: 0 acres
7. Total Property Area (4) — Total Coastal Wetlands Area (5) — Total Surface Water Area (6) — Total Project Area:
26.24 acres
Total project area shall be calculated to exclude the followin : the normal goal of imppounded structures, the area
between the banks of stremns and rivers, the area below the Normal High Water (NM line or Mean High Water
(MHW) line, and coastal wetlands Iandward from the NHW (or MHW) line. The resultant project area is used to
calculate overall percent built upon area (BUA). Non -coastal wetlands landward of the NHW (or MHW) line 7nay be
included in the total project area.
8. Project percent of impervious area: (Total Impervious Area / Total Project Area) X 100 =16.8 %
9. How many drainage areas does the project have?l (For high density, count 1 for each proposed engineered
stormwater BMP. For low density and other projects, use 1 for the whole property area)
10. Complete the following information for each drainage area identified in Project Information item 9. If there
are more than four drainage areas in the project, attach an additional sheet with the information for each area
provided in the same format as below.
Basin Information :.
Drainage Area 1
Drainage Area T
Drainage Area
Drainage Area _
Receiving Stream Name
UN Trib to
Town Creek
Stream Class
C:NSW
Stream Index Number *
28-83
Total Drainage Area (sf)
442,572
On -site Drainage Area (sf)
442,572
Off -site Drainage Area (sf)
0
Proposed Im ervious Area (sf}
250,795
% Impervious Area** (total)
21.9%
Impervious" Surface Area
Drainage Area 1
Drainage Area
Drainage Area _
Drainage Area _
On -site Buildings/Lots (sf)
57,600
On -site Streets (sf)
0
On -site Parking (sf)
57,738
On -site Sidewalks (sf)
1,115
Other on -site (so
92,654
Future (sf)
41,688
Off -site (sf)
0
-
Existing BUA*** (sf)
0 (Post 1994)
Total (sf):
250,795
" Stream Class and Index Number can be determined at: htt : rtal.nedenr.or' web zv )s csu elassi ications
Form SWU-101 Version Oct. 31, 2013 Page 3 of 6