Metrolina Engineering and Surveying Associates - SSW-SWU-101-Corrected pg 3-Grove Manor

Form SWU-101 Version Oct. 31, 2013 Page 3 of 6
IV. PROJECT INFORMATION
1. In the space provided below, briefly summarize how the stormwater runoff will be treated.
The storm water will be treated by 3 BMPs, 2 sand filters and 1 wet pond.

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 PUD Approval 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 Catawba River basin.
4. Total Property Area: 15.5 acres 5. Total Coastal Wetlands Area: acres
6. Total Surface Water Area: acres
7. Total Property Area (4) – Total Coastal Wetlands Area (5) – Total Surface Water Area (6) = Total Project
Area+: 15.5 acres
+ Total project area shall be calculated to exclude the following: the normal pool of impounded structures, the area
between the banks of streams and rivers, the area below the Normal High Water (NHW) line or Mean High Water
(MHW) line, and coastal wetlands landward 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 may
be included in the total project area.
8. Project percent of impervious area: (Total Impervious Area / Total Project Area) X 100 = 42.3 %
9. How many drainage areas does the project have?3 (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 2 Drainage Area 3 Drainage Area
Receiving Stream Name Twelvemile Crk Twelvemile Crk Twelvemile Crk
Stream Class * C C C
Stream Index Number * 11-138 11-138 11-138
Total Drainage Area (sf) 3.72 1.88 14.99
On-site Drainage Area (sf) 3.72 1.88 7.18
Off-site Drainage Area (sf) 0 0 7.81
Proposed Impervious Area** (sf) 2.00 0.89 2.91
% Impervious Area** (total) 54 47 19

Impervious** Surface Area Drainage Area 1 Drainage Area Drainage Area 3 Drainage Area
On-site Buildings/Lots (sf) 64600 22800 87400
On-site Streets (sf) 16250 11350 21050
On-site Parking (sf)
On-site Sidewalks (sf) 6500 4540 8420
Other on-site (sf)
Future (sf)
Off-site (sf) 10018
Existing BUA*** (sf)
Total (sf): 87350 38690 126888
* Stream Class and Index Number can be determined at: http://portal.ncdenr.org/web/wq/ps/csu/classifications
** Impervious area is defined as the built upon area including, but not limited to, buildings, roads, parking areas,
sidewalks, gravel areas, etc.
*** Report only that amount of existing BUA that will remain after development. Do not report any existing BUA that
is to be removed and which will be replaced by new BUA.