SW8120204_COMPLIANCE_20120216

STORMWATER DIVISION CODING SHEET
POST -CONSTRUCTION PERMITS
PERMIT NO.
SW21910-04
DOC TYPE
❑ CURRENT PERMIT
❑ APPROVED PLANS
❑ HISTORICAL FILE
COMPLIANCE EVALUATION INSPECTION
DOC DATE
;��UA«P
YYWMMDD

�mm �re.y
SW8 040239 Before
2/16/12
Modification
(44 Lots)
SW8 040239
All Lots Except 28
(43 Lots)
SW8120204
Lot 28
(1 Lot)
Project Area (ac)
29.62
28.602
1.018
Wetland Area (ac)
1.8
1.8
0.0
Project Area, Wetland Corrected (ac)
27.82
26.802
1.018
Project Area, Wetland Corrected (sf)
1,211,839
1,167,482
44,357
Max % (per 15A NCAC 2H .1005, eff. 911195)
25.0%
25.0%
Max BUA (sf):
302,960
291,870
Actual % BUA
25.0%
25.5%
43.4%
Allocated BUA(sf):
302,920
298,168
19,229
Onsite
302,920
298,168
12,931
Buildings (4,752sf/lot)
209,088
204,336
4,752
Existing Overbuilt
4,481
Additional Impervious Proposed
3,698
Streets
73,854
73,854 0
Sidewalks
19,978
19,978 0
"Extra" Future Potential (sf):
0
0 0
Offsite
0
0 6,298
Amount "over" 25% Low Density (sf):
N
6,298

General Data: Impervious, Drainage Area and Volume
PROJECT NUMBER: SW8
120204
Reviewer:
K Johnson
DRAINAGE BASIN:
White Oak
Current Date
15-Feb-12
Original Run Date:
15-Feb-12
DA Number
1
2
3
4
5
6
7
8
9
10
BMP Type
Closed SF
No BMP in
DA
No BMP in
DA
No BMP In
DA
No BMP In
DA
No BMP In
DA
No 8MP In
DA
Na BMP In
DA
No BMP In
DA
No BMP In
DA
Receiving Stream
UT Queens
Creek
Stream Index
19-41-16
Class
SA; HOW
Impervious Area
Proposed Impervious ALL IMPERVIOUS Total flZ:
19,229
0
0
0
0
0
0
0
0
0
Onsite Buildings
19,229
Onsite Streets
Onsite Parkin
Onsite Sidewalks
Onsite Other
Future
Offsite
Existing
P_reviousl -P. rmi rvt Id Rule
11,050
0
0
0
0
0
0
0
0
0
Onsite Buildings
11,050
Onsite Streets
Onsite Parkin
Onsite Sidewalks
Onsite Other
Future
Mile
Existing
P.ro osed Im envious Sub ect to 20081P.hll Rule it 2:
8,179
0
0
0
0
0
0
0
0
0
Draina a Area
Drainage Area Total ftZ:
50,655
Onsite ftZ:
44,357
Offsile ft :
6,298
vacf-tgl• °,uw•t� rome:u ^
Ereviousl -Permitted Drain a Area • !d Rule ftz:
50,655
0
0
0
0
0
0
0
0
0
Onsite ftZ:
44,357
Offsile ft :
6,298
Proposed DA (Being Added By Mod) , ft :
0
Drainage Area Sub' et to Old Rule ftZ:
42,476
01
0
0
0
0
01
0
0
0
Drainage Area Sub' ct to New Rule ftZ:
8,179
Percent Impervious Overall, per DA:
37.96%
Volume Required
Volume Required, Old Rule ft3:
1,509
RvpWDwelopment, Old Rule:
0.28
Desi n Storm Old Rule in:
1-5
Volume Required, New Rule ft3:
2,245
RVPre Development. New Rule:
0,05
0.05
0,05
0.051
0.05
0.05
0.05
0.05
0.05
0,05
Rvpw Development• New Rule:
0.95
Design Storm1.5-, in:
1.5
1.51
1.5
1.5
1.5
1.5
1.5
1.5
1.5
1.5
Design Storm,n24h„ in:
3.66
Subject to SA? Y or N
Y
Volume Required,.5-, ft :
971
Volume Required,ytUh„ ft :
2,245
Volume Required, Total Old +New Rule W:
3,754

Closed Sand Filter
PROJECT NUMBER: SWS
120204
Reviewer:
K Johnson
DRAINAGE BASIN:
White Oak
Current Date
15-Feb-12
Original Run Date:
15-Feb-12
DA Number
1
2
3
4
5
6
7
8
9
10
BMP Type
Volume, Area & Head
Water Quality Volume WQ Simple Method, ft3:
Closed SF
3.754
No BMP in
CA
No BMP In
CA
No BMP in
CA
Na BMP In
CA
No BMP In
CA
No BMP In
CA
No BMP In
CA
No BMP In
CA
No BMP in
CA
Water Quality Volume, Adjusted (WQVAdi), ft3:
Re wired Volume
2,8151
Volume Provided ft3:
1,759
System provides a separate storage tank, 2,834cf
System Holds the Required Volume?
N
Head, Max Head on Fitter, H,,,, ft:
2.2
Elevation Bottom of Grate Elevation fmsl.
31.3
Elevation Weir blw Chambers fmsl:
36.0
Elevation Top of Sand Elevation fmsl:
33.5
Elevation Bottom of Sand Elevation fmsl:
31.3
Head, Average Head on Filter, HA, ft:
9.1
Surface Area, Sed. Basin Provided, Asp,o,m,,,, ft2:
248
Surface Area, Sed. Basin Minimim, Asm., ft2:
248
Surface Area, Sand Filter Bed Provided, Arp,o idd, ft2:
277
Surface Area, Sand Filter Bed Mimimum, AFMr. ft2:
431
Depth of Sand ft.
2.2
Surface Area Mimum Required (As+AF), ftz:
1,297
Has Hma, Been Met?:
Y
Is Enough As provided?:
Y
Is Enough AF Provided?:
Drawdown
Orifice Diameter, in:
N
6.00
Orifice Diameter, ft:
0.50
Orifice Area ft2:
0.196
Head, Average Head on the Orifice, HAo,&e1 ft
1.56
Flow Rate Minimum for 40 Hrs, Osec:
0.03
Flow Rate Through Orifice DWQ Calc ft3/sec:
1.180