SW8030518_COMPLIANCE_20030515 (2)

STORMWATER DIVISION CODING SHEET
POST -CONSTRUCTION PERMITS
PERMIT NO.
DOC TYPE
❑CURRENT PERMIT
❑ APPROVED PLANS
❑ HISTORICAL FILE
COMPLIANCE EVALUATION INSPECTION
DOC DATE-
ao.1)51j`
YYYYMMDD

Sig 0--5071311
01
C�)
STORMWATER SUBMITTAL REQUIREMENTS
INFILTRATIONIEXFILTRATION SYSTEMS
Basins and Trench
A. Site Plan
1.
Development/Project Name
2.
Designer=s seal, signature, name and firm.
3.
Legend
t�
4.
North Arrow
5.
Location Map with direction, distance to named streets, NCSR numbers.
6.
Scale
✓ '
7.
Date
—�
Revision number and date.
Original contours, proposed contours, spot elevations, finished floor. elevations.
10.
Existing drainage, including off -site. Include a map of any offsite areas.
11.
Prop crty/P roj ect boundary lines, dimensioned.
12.
Mean High Water Line, if necessary.
13.
Drainage easements, pipe sizes.
Wetlands delineated, or a note on the plans that none exist. Infiltration system may not
be located in a wetland.
15---Betai4-s-e,f-the-read7parking,-cuL-de_sacs„,incl,udin s ewalks_curh-and- utter .
17.
Level spreader mechanism within a basin. (Not needed for trench).
8
Vegetated filter detail if SA waters involved. This is NOT a connector ditch.
Dimensions of th, road, parking cul-de-sacs, sidewalks, and curb and gutter.
20.
Unit footprint with dimensions and concrete wood deck areas noted.for apartments
or condo development.
21.
Basin section with:
Bottom elevation R �,
Storage elevation
22.
Slopes: 3:1 C.�.�
Trench section w' h: U
evation
\!'hnd width of trench. 7 ¢'iJ if,
ed pipe size , ��
r
mat rial
23. Bypass structure detail. Must bypass prior to enterin ethe ponktrench. (Contact DWQ
for required design storm if no bypass is provided.)
24. Location of monitoring wells, if necessary.
25. Vegetation requirements. Weeping Love Grass its Inot suitable for use
inNC.
_ �r v j s`uv -! Lit - l.J � v, l✓ V �. • C!' Gc �
4S
�5"Y'VLC "S ru'vj 7

STORMWATER SUBMITTAL REQUIREMENTS
WFILTRATION/EXFILTRATION SYSTEMS
Basins and Trench
B. Calculations
1. Required volume, 1.5" for SA, 1.5" for non -SA, for bypassing systems. Contact DWQ
for design storm for non -bypassing systems.
2. Provided volume.
3. Drawdown time for the basin/trench.
4. Built -upon area draining to each basin/trench
C. Supporting Documentation
1. A completed permit application and supplement.
a. Is the person who signed the landowner or a leasee? Must be landowner.
b. Sections completely filled in and initialed.
C. Check signature per .1003 (e). Make sure title is provided.
d. If agent signs, signatory authorization from owner.
e. Infiltration supplement sheet provided.
f. Mailing address & phone of applicant- no C/O.
g. Verify water body classification.
h. Missing information.
L Hand initial design requirements.
2. Soils report
a. Type of soil
b. Bore location log
C. Depth to&asonal High Water Table
d. Expected'infiltration rate. Use lowest value if a range is specified.
3
Proposed deed restrictions, if applicable.
�gvgoo) c..r�
d F
t
105 4�70

5/15/2003
CDC
WATERSHED DATA
Total Drainage Area
s . ft. acres
74,052 1.70
Impervious Area
Land Use
s . ft.
I acres
buildings
10,560
0.24
arkin las halt
13,006
0.30
concrete
3,514
�27,080
0.08
Total
0.62
INFILTRATION SYSTEM:
Volume of first inc
C
Volume provided:
❑RAWDOWN RATE:
one narr or runorr =
r= 3.545.24 cu-
Vp = 5,662.00 cu-ft
RATE OF INFILTRATION 6 INIHR
DEPTH OF BASIN: 31.2 1N
DRAW DOWN RATE: 5.2 HRS
Lake Ave 03033
Infiltration Basin
10-year Storm
°% impervious = 0.366
= 36.6°%
say 37.0%
CPRE = 0,25
CPOST = (°% imp.)(.95)+(1-0% imp.)(.25)
0.51
12 = 5.06 inlhr
110 = 6.30 inlhr
125 = 7.13 inlhr
Rainfall 1.5
Pond #1 (so Pond #2 (so
657 Bottom: 531 38.2 Elev
1687 Flood Pool: 1480 40.8 ' Elev
�o01111N/w �
CARO��ti
a SEAL 9;:
17374
GRES
19
I 'V�