SW8060347_COMPLIANCE_20060626

STORMWATER DIVISION CODING SHEET
POST -CONSTRUCTION PERMITS
PERMIT NO.
SW Z/�
DOC TYPE
❑ CURRENT PERMIT
❑ APPROVED PLANS
❑ HISTORICAL FILE
QED COMPLIANCE EVALUATION INSPECTION
l
DOC DATE
p
YYYYMMDD

CURB AND GUTTER ANALYSIS FILE: S:IWQSIC&G1SW8 060347
PROJECT NUMBER.
SW8 060347
DATE:
26-Jun-06
PROJECT NAME:
Meadowview Elem Sch
RECEIVING STREAM:
UT to Blue Creek
CLASS:
SC; NSW
DRAINAGE BASIN:
White Oak
INDEX:
19-8
A= BY+MY
i, inlhr=
7
P= B + 2Y
(1 + MA2)^0.5
n=
0.027
R= AIP
M=
5
HD Packet Curb Outlets
FLOWRATE 1 VELOCITY COMPUTATION
Q=CiA
<=.05
V=QIA
Swale # DA
BUA
C
Q
Slope
Velocity
acres
acres
cfs
(ft/ft)
fps
1 0.49
0.18
0.49
1.67
0.006
1.65
2A 0.64
0.17
0.41
1.82
0.0045
1.46
2B 1.06
0.4
0.49
3.67
0.004
1.68
4 0.29
0.13
0.55
1.12
0.007
1.39
10 0.49
0.33
0.73
2.49
0.004
1.48
13 0.43
0.39
0.91
2.73
0.003
1.40
14 0.28
0.16
0.65
1.27
0.003
1.15
15 0.42
0.21
0.59
1.73
0.004
1.39
22 0.29
0.12
0.52
1.06
0.005
1.33
23 0.45
0.45
0.98
3.09
0.005
1.72
24A 0.54
0.18
0.46
1.74
0.0035
1.34
24B 0.94
0.39
0.52
3.45
0.0008
0.89
NORMAL DEPTH COMPUTATION
SWALE # B Y A P R Zav Zrea
1
0
0.45
1.01
4.59
0.22
0.37
0.39
2A
0
0.5
1.25
5.10
0.25
0.49
0.49
2B
0
0.66
2.18
6.73
0.32
1.03
1.05
4
0
0.4
0.80
4.08
0.20
0.27
0.24
10
0
0.58
1.68
5.91
0.28
0.73
0.71
13
0
0.625
1.95
6.37
0.31
0.89
0.90
14
0
0.47
1.10
4.79
0.23
0.42
0.42
15
0
0.5
1.25
5.10
0.25
0.49
0.50
22
0
0.4
0.80
4.08
0.20
0.27
0.27
23
0
0.6
1.80
6.12
0.29
0.80
0.79
24A
0
0.51
1.30
5.20
0.25
0.52
0.53
24B
0
0.88
3.87
8.97
0.43
2.21
2.21
GRASS COVER SPECIFIED ON PLANS:
ALLOWABLE VELOCITY, fps, for slopes 0%-5%, easily erodible soil:
Bermuda 5 Bluegrass 4.5
Fescue 4.5 Legume 3.5
Bahia 4.5
COMMENTS

VORTSNTRY SYSTEM Filename:
NET ANNUAL TSS REMOVAL EFFICIENCY
S:\WPDATA\WQSWORTSENTRW60347-1
Project # SW8 060347-1 System #1 (System E) Date
Project Name Meadowview Elementary School Reviewer
Recvng Stream UT to Blue Creek Classification
Drainage Basin White Oak Index #
Site Area 30.4 acres Drainage Area
Impervious Area Calculation
Buildings
Parking/Asphalt 11800
Concrete
Total, sq ft
Volume/Storage Calculation
If Rational Method is used, place a 1 in this box
RV
VORTSENTRY Model No. Selected
VortSentry Treatment Vol, CF:
Design Ratio'
Flow Rate Capacity, CFS
10 Year 10 Min High Intensity Event
RV -
Volume Flow Rate
Required Bypass Capacity, Q
Elevation at B ass Weir
Weir Elev., ft: 48.43 Length, L,
Rim Elev., ft: 50,40
27-Jun-06
P.Bartlett
SC; NSW
19-8
12632 SF
0.29 ac
Rational Cc (list C after each BIJA)
% Impervious- 93.4%
vvr4-
Cc: 0.95
0.89
VS40
50.00
::77%
4,
0.6 (@ 80% TSS Removal of OK 110 Silica Sand)
7.26 in/hr
0.89
1.3 CFS
F 0.93] Co1 3.3
Q=Cc)LH 312
H= 0.55
WEIR, WSEL:
Weir El. +
Must be <
50.40 Rim Elev.
1", 30-Min Event
2.00 in/hr
Volume Flow Rate
�' CFS
-
Operating Rate
Rainfall
Operating Rate, %Total Rainfall
%Removal
%Relative
Intensity, jUIE
cfs1c;f 2qq!!s-
Efficiency4
Efficiency
0.02
0.0001 4.40
98.0
4.3
0.04
0.0002 4.80
98.0
4.7
0.06
0.0003 5.20
98.0
5,1
0.08
0.0004 4,60
98.0
4,5
0.10
0.0005 4.00
98.0
3,9
0.12
0.0006 3.50
98.0
3A
0.14
0.0007 3.70
96.9
3.6
0.16
0,0008 3.50
96.9
3.4
0.18
0.0009 3.20
96.9
3.1
0.20
0.0010 120
96.9
3,1
0,25
0.0013 6.20
95.8
5.9
0.45
0.0023 18.40
94.7
17.4
0.65
0.0034 10.70
92.5
9.9
0.85
0.0044 6.80
91.4
6.2
1.00
0,0052 6.10
87.7
5.3
11.25
0,0065 3,30
84.0
2.8
1.50
0.0077 180
83.2
3.2
1.75
0.0090 1.70
82.4
1.4
2.00
0.0103 1.00
81,6
0.8
2.25
0.0116 0.70
80.0
0.6
2.50
0.0129 0.80
75.7
0.6
99.60
93.3
% Rain Failing at >2.5inthr or Bypassing Treatment
0.4
Assumed Removal Efficiency for Bypassed Flows,
%
0.0
Removal Efficiency Adjustment' , %
6.8
Net Annual TSS Removal Efficiency, %
Required Net Annual TSS Removal Efficiency, %
:
iii770=
Notes:
'Design Ratio = (Tot.
Drain. Area) x (Runoff Coefficient)NortSentry Treatment Volume
2 Operating Rate, gpm/sf = Intensity, in/hr x Design Ratio
313ased on 10 years of rainfall data from NCDC Station 9457, Wilmington
WSO Airport, New Hanover County, NC
413aSed on Vortechnics laboratory verified removal of OK110 silica gradation with mean particle size of 110 microns,
cMa"ng partides ranging from 53-150 mimm.
513eduction due to use
of 60-minute data for a site that has a time of concentration less than 30-minutes.

VORTSENTRY SYSTEM
Filename:
S:IWPDATAIWQSIVORTSENTRY1060347-2
NET ANNUAL TSS REMOVAL EFFICIENCY
Project # SW8060347-2 System #2 (system D)
Date
27-Jun-06
Project Name Meadowview Elementary School
Reviewer
P.Bartlett
Recvng Stream UT to Blue Creek
Classification
SC; NSW
Drainage Basin White Oak
Index #
19-8
Site Area 30.4 acres
Drainage Area
16988 SF
0.39 ac
Impervious Area Calculation
Rational Cc (list C after each BUA)
Buildings
Parking/Asphalt 15100
1
Concrete
Total, sq ft510D
% Impervious= 88.9%
Volume/Storage Calculation
If Rational Method is used, place a 1 in this box
RV
VORTSENTRY Model No. Selected
VortSentry Treatment Vol, CF:
Design Ratio'
Flow Rate Capacity, CFS
10 Year 10 Min High Intensity Event
RV
Volume Flow Rate
Required Bypass Capacity, Q
Elevation at Bypass Weir
Weir Elev., ft:F 47.83 Length, L, ft:
Rim Elev., ft. 150.40
Cc: 0.91
0.85
VS40
50.00
5
0.7 (Q 81.6% TSS Removal of OK110 Silica Sand)
7.26 in/hr
0.85
i24 CFS
1.7 CFS
0.93 CD1 3.33
Q=CoLH12
H= 0,68
WEIR, WSEL:
Weir El. + H= '; ?d8'; 1` fi
Must be <
50.40 Rim Elev.
1", 30-Min Event
2.00 in/hr
Volume Flow Rate
i`i0s615
CFS
Operating Rate
:- ° OJ 133'
cfs/cf
Rainfall
Operating Rate2, %Total Rainfall
%Removal
%Relative
Intensity, in/hr
cfslcf Depth3
Efficiencv4
Efficiency
0.02
0,0001 4.40
98.0
4.3
0.04
0.0003 4.80
98.0
4.7
0.06
0.0004 5.20
98.0
5.1
0.08
0.0005 4.60
98.0
4.5
0.10
0.0007 4.00
98.0
3.9
0.12
0.0008 3.50
98.0
3A
0.14
0.0009 3.70
96.9
3.6
0.16
0.0011 3.50
96.9
3.4
0.18
0,0012 3.20
96.9
3.1
0.20
0.0013 3.20
96.9
3.1
0.25
0.0017 6.20
95.8
5.9
0.45
0.0030 18.40
94.7
17.4
0.65
0.0043 10,70
92.5
9.9
0.85
0.0056 6.80
91.4
6.2
1.00
0.0066 6.10
B7.7
5.3
1.25
0.0083 3.30
84.0
2.8
1.50
0.0099 3,80
83.2
3.2
1.75
0.0116 1.70
82.4
1.4
2.00
0.0133 1.00
81.6
0.8
2.25
0.0149 0.70
80.0
0.6
2.50
0,0166 0.80
75.7
0.6
99.60
93.3
% Rain Falling at >2.5inlhr or Bypassing Treatment
0.4
Assumed Removal Efficiency for Bypassed Flaws, %
0.0
Removal Efficiency Adjustment' , %
6.8
Net Annual TSS Removal Efficiency, %
8�1=
Required Net Annual TSS Removal Efficiency, %
==. 7T 0
Notes:
'Design Ratio = (Tot. Drain. Area) x (Runoff Coefricient)NortSentry Treatment Volume
20perating Rate, gpmisf = Intensity, in/hr x Design Ratio
3Based on 10 years of rainfall data from NCDC Station 9457, Wilmington WSO Airport, New Hanover County, NC
°Based on Vortechnics laboratory verified removal of OK110 silica gradation with mean particle size of 110 microns,
wntalnang particles ranging from 53-150 microns.
5Reduction due to use of 60-minute data for a site that has a time of concentration less than 30-minutes.

1 .f
VORTSENTRY SYSTEM
Filename:
NET ANNUAL_ TSS REMOVAL EFFICIENCY
Project # SW8 060347-3 System #3 (System F)
Date
Project Name Meadowview Elementary School
Reviewer
Recvng Stream UT to Blue Creek
Classification
Drainage Basin White Oak
Index #
Site Area 30.4 acres
Drainage Area
Impervious Area Calculation
Buildings
Parking/Asphalt 77900
Concrete
Total, sq ft 7T9(iQ
Volume/Storage Calculation:
If Rational Method is used, place a 1 in this box
RV
VORTSENTRY Model No. Selected
VortSentry Treatment Vol, CF:
Design Ratio'
Flow Rate Capacity, CFS
10 Year 10 Min High Intensity Event
RV
Volume Flow Rate
Required Bypass Capacity, Q
Elevation at BVpass Weir
Weir Elev„ ft: 46.75 Length, L, ft: F 1.31
Rim Elev., ft: 51.00
M1
S:1W PDATAIWQSIVORTSENT RY1060347-3
27-Jun-06
P.Bartlett
SC; NSW
19-8
87120 SF
2.00 ac
Rational Cc (list C after each BUA)
1
% Impervious= 89.4%
Cc: 0.92
0.85
VS60
170.00
i301:#f
3.4 (@ 55.7% TSS Removal of OK110 Silica Sand)
7.26 inlhr
0.85
i;12'4 CFS
9.0 CFS
Col3.33
Q=CDLH3l2
H= 1.62
WEIR, WSEL:
Weir El. + H- s ;' = = i i $;37: ft
Must be <
51.00 Rim Elev.
1", 30-Min Event
2.00 inlhr
Volume Flow Rate
~i3i42 CF5
Operating Rate
=<4U.1 cislcf
Rainfall
Operating Rate2, %Total Rainfall
%Removal
%Relative
Intensity, inlhr
cfslcf Depth
Efficiency
Efficiency
0.02
0.0002 4.40
98.0
4.3
0.04
0.0004 4.80
98.0
4.7
0.06
0.0006 5.20
96.9
5.0
0.08
0,0008 4.60
96.9
4.5
0.10
0.0010 4.00
96.9
3.9
0.12
0.0012 3,50
95.8
3.4
0,14
0.0014 3.70
95.8
3.5
0.16
0.0016 3.50
95.8
3.4
0.18
0,0018 3.20
94.7
3.0
0.20
0.0020 3.20
94.7
3.0
0.25
0.0025 6,20
93.6
5.8
0,45
0.0045 18A0
89.6
16.5
0.65
0.0065 10,70
84.0
9.0
0.85
0.0085 6.80
82.4
5.6
1.00
0.0101 6.10
80.8
4.9
1.25
0,0126 3.30
71.3
2.4
1.50
0.0151 3.80
62.6
2.4
1.75
0.0176 1.70
57.0
1.0
2.00
0.0201 1.00
55.7
0.6
2.25
0.0226 0.70
44.6
0.3
2.50
0.0251 0.80
34.2
0.3
99.60
87.4
% Rain Falling at >2.5iNhr or Bypassing Treatment
0A
Assumed Removal Efficiency for Bypassed Flows,
%
0.0
Removal Efficiency Adjustment' , %
6.8
Net Annual TSS Removal Efficiency, %
i842i
Required Net Annual TSS Removal Efficiency, %
77 0i
Notes:
'Design Ratio = (Tot.
Drain. Area) x (Runoff Coefficient)NortSentry Treatment Volume
Operating Rate, gpmisf = Intensity, inlhr x Design Ratio
38ased on 10 years of rainfall data from NCDC Station 9457, Wilmington WSO Airport, New Hanover County, NC
°Based on Vortechnics laboratory verified removal of OK110 silica gradation
with mean
particle size of 110 microns,
comairurq panides runpirq fmm 53.150 mimes.
5Reduction due to use of 60-minute data for a site that has a time of concentration less than 30-minutes.

'VORTS�ENTRY SYSTEM
Filename:
S:IWPDATAIWQSIVORTSENTRY1060347-4
NET ANNUAL TSS REMOVAL EFFICIENCY
Project # SW8 060347-4 System #4 (System G)
Date
27-Jun-06
Project Name Meadowview Elementary School
Reviewer
P.Bartlett
Recvng Stream UT to Blue Creek
Classification
SC; NSW
Drainage Basin White Oak
Index #
19-8
Site Area 30.4 acres
Drainage Area
21786 SF
0.50 ac
Impervious Area Calculation
Rational Cc (list C after each BUA)
Buildings
Parking/Asphalt 20500
1
Concrete
Total, sq ft i; ?2(j50{
% Impervious= 94.1%
Volume/Storage Calculation
If Rational Method is used, place a 1 in this box
RV
VORTSENTRY Model No. Selected
VortSentry Treatment Vol, CF:
Design Ratio'
Flow Rate Capacity, CFS
10 Year 10 Min High Intensity Event
RV
Volume Flow Rate
Required Bypass Capacity, Q
Elevation at B ass Weir
Weir Elev., ft: 47.93 Length, L, ft:
Rim Elev., ft:1 50.50
Cc: 0.95
0.90
VS40
50.00
0.9 Q 81.6% TSS Removal of OK110 Silica Sand)
7.26 inlhr
0.90
CFS
2.4 CFS
0.93 Co 3.33
Q=CoLH312
H= 0.83
WEIR, WSEL:
Weir E1. + H= a:::4876 ft
Must be <
50.50 Rim Elev,
1", 30-Min Event
2.00 inlhr
Volume Flow Ratei90
CFS
Operating Rate
€RQ#9
cfs/cf
Rainfall
Operating Rate, %Total Rainfall
%Removal
%Relative
Intensity, inlhr
cfslcf D. epth3
Efficiency
Efficiency
0.02
0.0002 4.40
98.0
4.3
0.04
0.0004 4.80
98.0
4.7
0.06
0.0005 5.20
98.0
5.1
0.08
0.0007 4.60
98.0
4.5
0,10
0,0009 4.00
98.0
3.9
0.12
0,0011 3.50
98.0
3.4
0.14
0.0013 3.70
96.9
3.6
0.16
0,0014 3.50
96.9
3.4
0.18
0,0016 3.20
96.9
3.1
0.20
0.0018 3.20
96.9
3.1
0.25
0.0022 6.20
95.8
5.9
0.45
0.0040 18,40
94.7
17.4
0.65
0.0058 10.70
92.5
9.9
0.85
0.0076 6.80
91.4
6.2
1.00
0.0090 6.10
87.7
5.3
1.25
0.0112 3.30
84.0
2.8
1.50
0.0135 3.80
83.2
3.2
1.75
0.0157 1.70
82.4
1.4
2.00
0.0179 1.00
81.6
0.8
2.25
0.0202 0.70
80.0
0.6
2.50
0.0224 0.80
75.7
0.6
99.60
93.3
% Rain Falling at >2.5iNhr or Bypassing Treatment
0.4
Assumed Removal Efficiency for Bypassed Flows, %
0.0
Removal Efficiency Adjustment' , %
6.8
Net Annual TSS Removal Efficiency,
%
Required Net Annual TSS Removal Efficiency, %
- 77 O'iais
Notes:
'Design Ratio = (Tot. Drain. Area) x (Runoff Coefficient)fvortSentry Treatment Volume
Operating Rate, gpmisf = Intensity, inlhr x Design Ratio
36ased on 10 years of rainfall data from NCDC Station 9457, Wilmington WSO Airport, New Hanover County, NC
"Based on Vortechnics laboratory verified removal of OK110 silica gradation with mean particle size of 110 microns,
containing panides ranging from 53-150 mimns.
5Reduction due to use of 60-minute data for a site that has a time of concentration less than 30-minutes.

06/20/2006 12:29
8663768511 CONTECH STORMWATER PAGE 02/15
VortSentry� Stage Discharge Calculations
Meadowview Elementary School
��yoNow- a- wFw@w H Onslow County, NC � ���
sTORMWATER Model VS40 'efi
sawTioHs_
System D = No • 0
Treatment Chamber Outlet Orifice
Orifice Area (ft) = 0.180
Discharge Coefficient = 0.56
Flow Partition Weir
Crest El. (ft) =
Weir Crest Length (ft) =
Discharge Coefficient =
0.83
0.93
(3.33)
Head
/A/ (ft)
Elevation
(ft)
Treatment Flow
B ass Flow Rate
(cfs)
Total Flow Rate
(cfs)
(cfs)
V. 0.25
47.25
0.2
0
0.2
0.50
47.50
0.3
0
0.3
0.75
47.75
0.5
0
0.5
1.00
48.00
0.6
0.2
0.8
1.25
48.25
0.7
0.8
1.5
1.50
48.50
0.8
1.6
2.4
1.75
48.75
0.8
2.7
3.5
2.00
49.00
0.9
3.8
4.7
2.25
49.25
1
5.2
6.2
2.50
49.50
1
6.6
7.6
2.75
49.75
1.1
8.1
9.2
3.00
50.00
1.2
9.8
11
3.25
50.25
1.2
11.5
12.7
3.50
50.50
1.3
13.3
14.6
3.75
50.75
1.3
15.3
16.6
Calculated b :
JLS Date:
4/18/2006 IlChecked
By: Date:
18.0
16.0
14.0
12.0
u
m 10.0
8.0
0
u. 6.0
4.0
2.0
0.0
0.00
21401 DADS
Stage Discharge
0.50 1.00 1.50 2.00 2.50 3.00 3.50 4.00
Head (fl)
�0 treatment
Q total
3UN 2 3
6/19/2006

06/20/2006 12:29 8663768511 CONTECH STORMWATER PAGE 03/15
VortSentry® Net Annual TSS Removal Efficiency Estimate
r,� ue Meadowview Elementary School
V%►`ft-A iOnslow County, NC
STORMWATER Model VS40
SOt_tli101uS.,
System D = hto &
Design Ratio' = 0.39 acres x 0.85 2 r� �^°" = 0 007
50 ft3
.vo6,G
Rainfall Intensity
"thr
Flow Rate
Operating Rate
% Total'Rainfall
Rmvl. Effcva
%
Rai. Effcy
-
efs
cfs/ft'
/De th'
0.02
0.01
0.00013
/ 26.8%
98.0%
26.3%
0.04
0.01
0.00026
1 17.8%1
98.0%
17.4%
0.06
0.02
0.00040
/ 13.2%
98.0%
12.9%
0.08
0.03
0,00053
1 8.0% 1
98.0%
7.8%a
0.10
0.03
0.00066
5.7%
96.9%
5.6%
0.12
0.04
0.00079
1 4.6% 1
96.9%
1 4.4%
0.14
0.05
0.00092
1 3.2% 1
96.9%
3.1 %
0.16
0.05
0.00106
1 3.1 % 1
96.9%
3.0%
0.18
0.06
0.00119
1 2.1 % 1
96.9%
2.0%
0,20
0.07
0.00132
1 2.0% 1
95.8%
1.9%
0.25
0.08
0.00165
1 1 2.9% 1
95.8%
1 2.8%
0.45
0.15
0.00297
1 6A % 1
93.6%
5.7%
0.65
0.22
0.00429
1 1.3% 1
91.4%
1.2%
0.95
0.31
0.00627
1.4% 1
85.9%
1.2%
1.15
0.38
0.00758
k 0.8% 1
83.2%
0.7%
1.50
0.50
0.00989
i 1.0% 1
81.6%
0.8%
0.00
0.00
0.00000
1 0.0%
98.0%
0.0%
0.00
0.00
0.00000
0.0% !
98.0%
0.0%
0.00
0.00
0.00000
\ 0.0% /
98.0%
0.0%
0.00
0,00
0.00000
'10.0%
98.0%
0.0%
Net Annual TSS Removal Efficiency=
97%
1 - Design Ratio = (Total Drainage Area x Runoff Coefficient) / VortSentry Treatment Volume
= The Total Drainage Area and Runoff Coefficient are specified by the slte engineer
- Operating Rate (cfsfft3) = Rainfall Intensity ("/hr) x Design Ratio _ -? fJ 1
- Based on 10 years of rainfall data from NCDC station 807, Billings WSO, Yellowstone County, MT
4 - Removal efficiencies are based on Vortechnics laboratory verified removal of OK-110, a commercially available
silica gradation with a mean particle size of 110 microns, contafning particles ranging from 53-150 microns. 131
Calculated by: JLS Date: 04/18/06 = Checked by: Date:
21401 DADS 6/19/2006

06/20/2006 12:29 8663768511 CONTECH STORMWATER PAGE 04/15
VortSentry® Bouyancy Calculation Results
� Meadowview Elementary School
G EM"I Onslow County
STO MWAM Model VS40
50LlInONS_
system D No. 0
VortSenW Geometric 5 ifications: VortSent Section Heights:
Manhole Inside Diameter (ft):
4
Riser 1 Section fl :
0
Manhole Outside Diameter (ft):
4.83334
Additional Riser Section ft :
0
Wall Thickness ft :
0.41667
VortSente Section ft:
4
Top Slab Thickness (ft):
0.45833
Riser 2 Section MY
2.67
Base Slab Thickness (ft):
0.66667
Base Section LL
3.33
Inlet Pipe Diameter (ft):
1.25
Base Extension Width (ft):
0.00
Propertles of Materials Ibs!
Unit Weight of Concrete: 150
Unit Weight of Aluminum: 167
Unit Weight of Water: 62
Unit Weight of Saturated Soil: 48
Unit Weight of Unsaturated Soil: 110
Sfte Elevation Information (ft):
Water Table Elevation: 48.40
Finished Grade Elevation: 50.40
Depth of Overlying Saturated Soil: 0.0
Depth of Ove Unsaturated Soil: 1.0
Inlet pipe invert ft : 47
Bottom of tank elevation ft : 37.87
Top of tank Elevation ft : 49.37
Volume of Overlying Saturated Soil fl3 : 0
Volume of Overlying Unsaturated Soil (ff): 19
ITEM
WEIGHT LBS
WEIGHT(TONS)
Top Slab
1,261
0.6
Riser 1 Section
0
0.0
Additional Riser Section
0
0.0
VortSentryo Section includes Inlet/Outlet Sleeve
6,346
3.2
Riser 2 Section
2,315
1.2
Base Section
4,723
2.4
Base Extension or Anti -floatation Collar
0
0.0
Overyng Saturated Soll
0
0.0
Overlying Unsaturated Soil
2,076
1.0
Weight of water in tank
0
0.0
TOTAL 16,721 a
Assumes tank is empty)__
Height of Water Table Above Bottom of Tank (ft): 10.53
Corresponding Water Table Elevation (ft): 48.4
Volume of Water Displaced by Tank ft : 193
Bouyancy Force of Displaced Water X 150/6 FOS: 13,862
Net Bouyancy Force Down (Ibf): 2,859
Calculated B : JLS 4/18/2006 1 Checked By:

06/20/2006 13:25
B663768511
CONTECH STORMWATER
PAGE 01/11
-7,6
P'.g 3
VortSentryo Stage Discharge Calculations
Meadowview Elementary School
Nil►.: ;m. F+
Onslow County, NC
sr°MM'4TER
Model VS44
SOLLMONS-
�
System E = i,(o.
Treatment Chamber Outlet Orifice
Flow Partition Weir
Orifice Area (ft) =
0.180
Crest El. (ft) =
0.83
Discharge Coefficient =
0.56
Weir Crest Length (ft) =
0.93
Discharge Coefficient =
3-33
Head
Elevation
Treatment Flow
Bypass Flow Rate
Total Flow Rate
(cfs)
(cis)
(ft)
(ft)
(cfs)
0.25
47.85
0.2
0
0.2
0.50
48.10
0.3
0
0.3
0.75
48.36
0.5
0
0.5
1.00
48.60
0.6
•0.2
0.8
1.25
48.85
0.7
0.8
1.5
1.50
49.10
0.8
1.6
2.4
21401EADS
RECEIVE®
IUN 2 0 2006
6/20/2006
PARKER

06/20/2006 13:25. 8663768511 CONTECH STORMWATER RAGE 02/11
VortSentry® Net Annual TSS Removal Efficiency Estimate
i ,�,Meadowview Elementary School
►�rMC"n Onslow County, NC
STOWMATER Model VS4a
SOLiJT14N5,.
System E = oo , Q r -
Design Ratio' = 0.29 acres x 0.9 `
50 ft3 = 0.005
Rainfall Intensity Flow Rate OperatingRatez % Total Rainfall Rmyl. Effcv' Rel. Effcv
"thr cfs cfs1w Depth 3 % #4.7%
0.02 0.01 0.00010 4.4% 98.0% %
0.04 0.01 0.00021 4.8% 98.0%
0A6
0.02
0,00031
5.2%
98.0%
5.1%
0.08
0.02
0.00042
4.6%
98.0%
4.5%
0.10
0.03
0.00052
4.0%
98.0%
4.0%
0.12
0.03
0.00062
3.5%
98.0%
3.4%
0.14
0.04
0.00073
3.7%
96.9%
3.6%
0.16
0.04
0.00083
3.5%a
96.9%
3.3%
0.18
0.05
0.00093
3.2%
96.9%
3.1 %
0.20
0.05
0.00104
3.2%
96.9%
3.1 %
0.25
0.07
0.00130
6.2%
95.8%
5.9%
0.45
0.12
0.00234
18.4%
94.7%
17.4%
0.65
0.17
0.00338
10.7%
92.5%
9.9%
0.85
0.22
0.00441
6.8%
91.4%
6.2%
1.00
0.26
0.00519
6.1 %
87.7%
5.3%
1.25
0.33
0.00649
3.3%
84.0%
2.8%
1.50 0.39 0.00779 3.8% 83.2% 3.2%
1.75 0.46 0.00909 1.7% 82.4% 1.4%
2.00 0.52 0.01038 1.0% 81.6% 0.8%
2.25 0.59 0.01168 0 B% v ,-/ 80.0% 0.6%
2.50 0.65 0.01298 0.8% 75.7% 0.6%
Net Annual TSS Removal Efficiency = 93%
- Design Ratio = (Total Drainage Area x Runoff Coefficient) / VortSentry Treatment Volume
= The Total Drainage Area and Runoff Coefficient are specified by the site engineer.
- Operating Rate (cfs/ft) = Rainfall Intensity C/hr) x Design Ratio
- Based on 10 years of rainfall data from NCDC station 9457, Wilmington WSO Airport, New Hanover County, NC
- Removal efficiencies are based on Vortechnics laboratory verified removal of OK-110, a commercially available
ira gradation with a mean particle size of 110 microns, containing particles ranging from 53-150 microns.
alculated by: JLS Date: 04/18/06 IlChecked bv: Date:
21401 FADS 6/20/2006

86/20/2006 13:25 8663768511 CONTECH STQRMWATER
PAGE 03/11
VortSentry' Bouyancy Calculation Results
p� Meadowvlew Elementary School
Onslow County
srortMwA7ER Model VS40
SOLtlTlONS_
System E - No.
VortSent ° Geometric Specifications: VortSen Section Heights:
Manhole Inside Diameter (ft):
4
Riser 1 Section (ft):
0
Manhole Outside Diameter (ft):
4.83334
Additional Riser Section ft :
0
Wall Thickness (ft):
0.41667
VortSen Section (ft):
4
Top Slab Thickness (ff):
0.45833
Riser 2 Section (ftY.
2.67
Base Slab Thickness (ft):
0.66667
Base Section ft :
3.33
Inlet F3pe Diameter ft :
1.25
Base Extension Width ft :
0.00
Pro rtles of Materials Ibslilt
Unit Wel ht of Concrete: 150
Unit Weight of Aluminum: 167
Unit Weight of Water: 62
Unit Weight of Saturated Soil: 48
Unit Weight of Unsaturated Soil: 110
Site Elevation Information (ft):
Water Table Elevation: 48.00
FINshed Grade Elevation: 51.00
Depth of Overlying Saturated Soll: 0.0
Depth of Overlying Unsaturated Soil: 1.0
Inlet pipe invert R : 47.6
Botom of tank elevation (ft): 38.47
Top of tank Elevation (ft): 49.97
Volume of Overlying Saturated Soil (fig): 0
Volume of Ovedying Unsaturated Soll (ft): 19
ITEM
WEIGHT LB5
WEIGHT ONS
Top Slab
1261
0.6
Riser 1 Section
0
0.0
Additional Rfser Section
0
0.0
VortSente Section includes Inlet/Outlet Sleeve
6,346
3.2
Riser 2 Section
2,315
1.2
Base Section
4,723
2.4
Base Extension or Anti -floatation Collar
0
0.0
Overlying Saturated Soil
0
0.0
OverMng Unsaturated Soif
2,076
1.0
Weight of water in tank
0
0.0
TOTAL 16,721 a
Assumes tank Is empty)
Hei ht of Water Table Above Bottom of Tank ft : 9.53
Corresponding Water Table Elevation (ft): 48.0
Volume of Water Displaced by Tank ft' : 175
Bogyancy Force of DIs laced Water X 151/16 FOS: 12,546
Net Bouyancy Force Down (IbQ: 4,176
Calculated By: JLS 4/18/2006 Checked B

06/20/2006 13: 2!
' - r
B663768511
CONTECH STORMWATER PAGE 04/11
4 G..q ' Uv
47,tfli - ?
VortSent ' Stage Discharge Calculations
Mleadowview Elementary School
�AN I z� Onslow County, NC ������
SrORMWAM Model VS60
sorurtausK System F = NO.T
Treatment Chamber Outlet Orifice
Orifice Area (ft) = 0.475
Discharge Coefficient = 0.56
Flow Partition Weir
Crest El. (ft) =
Weir Crest Length (ft) =
Discharge Coefficient =
1.25
1.31
3.33
Head
L'5V JAI (ft)
Elevation
(ft)
Treatment Flow
Bypass Flow Rate
{cfs
Total Flow Rate
cfs)
cfs)
0.25
46.65
0.4
0
0.4
0.50
46.90
0.8
0
0.8
0.75
47.15
1.1
0
1.1
1.00
47.40
1 A
0
1.4
1.25
47.65
1.7
0
1.7
1.50
47.90
1.9
0.5
2.4
1.75
48.15
2.1
1.5
3.6
2.00
48.40
2.3
2.8
5.1
2.25
48,65
2.4
4.3
6.7
2.50
48.90
2.6
6
8.6
2.75
49.15
2.7
7.9
10.6
3.00
49.40
2.9
10
12.9
3.25
49.65
3
12.2
15.2
3.50
49.90
3.1
14.6
17.7
3.75
50.15
3.2
17.1
20.3
Calculated by:
JLS Date:
41181200E
Checked S : Date:
25.0
20.0
15.0
m
a
o, 10.0
LLI
5.0
0.0
0,00
21401FADS
Stage Discharge
0.50 1.00 1-50 2.00 2.50 3.00 3.50 4.00
Head (ft)
Q treatment
- ' a total I �
6/20/2006

06/20/2006 13:25 8663768511 CONTECH 5TORMWATER PAGE 05/11
VortSentryo Net Annual TSS Removal'Efficiency Estimate
„�� MM v. Meadowview Elementary School
11► MEW OOnslow County, NC ffift
sTORMWATER Model VS60 fire lint
soLurlONs_
System F
Design Ratio' =
2 acres x 0.85 = 0.01
170 ft3
Rainfall Intensl
"Air
Flow Rate
Onerating Rate,
% Total Rainfall
Rmvl. Effcv4
Rai. Effcv
cfs
cfs/ft'
Depth'
0.02
0.03
0.00020
4.4%
98.0%
4.3%
0.04
0.07
0.00040
4.8%
98.0%
4.7%
0.06
0.10
0.00060
5.2%
96.9%
5.0%
0.08
0.14
0.00080
4.6%
96.9%
4.5%
0.10
0.17
0.00100
4.0%
96.9%
3.9%
0.12
0.20
0.00120
3.5%
95.8%
3.4%
0.14
0.24
0.00140
3.7%
95.8%
3.6%
0.16
0.27
0.00160
3.5%
95.8%
3.3%
0.18
0.31
0.00180
3.2%
94.7%
3.0%
0.20
0.34
0.00200
3.2%
94.7%
3.0%
0.25
0.43
0.00251
6.2%
93.6%
5.8%
OA5
0.77
0.00451
18.4%
89.6%
16.5%
0.65
1.11
0.00651
10.7%
84.0%
9.0%
0.85
1.45
0.00852
6.8%
82.4%
5.6%
1.00
1.70
0.01002
6.1 %
80.8%
4.9%
1.25
2.13
0.01253
3.0%
71.3%
2.1 %
1.50
2.55
0.01503
3.0%
62.6%
1.9%
1.75
2.98
0.01754
,'f.2%, ,(,7
57.0%
0.7%
2.00
3.40
0.02004
/0.6%.\ {, ti
55.7%
0.3%
2.25
3.83
0.02255
44.6%
0.2%
2.50
4.25
0.02505
0.4%%r) . 0
34.2%
0.1 %
Net Annual_T-SS Removal Effiicienc =
86%
1 - Design ratio (Total Drainage Area x Runoff Coefficient) I VortSentry Treatment Volume
= The Total Drainage Area and Runoff Coefficient are specified by the slte engineer.
2 - Operating Rate (cfs/fP) = Rainfall Intensity ("/hr) x Design Ratio
3 - Based on 10 years of rainfall data from NCDC station 9457, Wilmington WSO Airport, New Hanover County, NC ✓
6-Removal efficiencies are based on Vortechnics laboratory verified removal of OK-110, a commercially available
adation with a mean particle size of 110 microns, containing particles ranging from 53-150 microns.
ted b : AS
bate: 04/18/06 Checked by: Date:
214011=ADS 6/20/2006

06/20/2006 13:25 8663768511 CONTECH STORMWATER PAGE 06/11
VortSentryo Bouyancy Calculation Results
p
� Meadowview Elementary School
� Onslow County
STORMUVATM Model VS60
Sptl}TIpNS System IF µo.
VortSenW Geometric Specifications: VortSenW Section Hai hts:
Manhole Inside Diameter (fi):
6
Riser 1 Section M.
0
Manhole Outside Diameter ft :
7.16666
Additlonal Riser Section ft :
0
Wall Thickness (ft).,
0.58333
VortSent Section ft :
6
Top Slab Thickness ft :
0.75
Riser 2 Section ft :
4
Base Slab Thickness (ft):
0.66667
Base Section ft).,
3.33
Inlet Pi a Diameter (ft):j
2
Base Extension Width Cft):1
0.00
Properties of Materials ibsl
Unit Wel ht of Concrete: 150
Unit Weight of Aluminum: 167
Unit Weight of Water. 62
Unit Wei ht of Saturated Soil: 48
Unit Weis ht of Unsaturated Soil: 110
Site Elevation Information ft :
Water Table Elevation: 48.00
Finished Grade Elevation: 51.00
Deplh of Overlying Saturated Soil: 0.0
De ih of OverlyingUnsaturated Soil: 1.1
Inlet pipe invert ft : 46.4
Bottom of tank elevation (ft): 34.72
Top of tank Elevation (ft): 49.89
Volume of Overlying Saturated Soil (ft3 : 0
Volume of Overtying Unsaturated Soil (ft): 45
ITEM
WEIGHT LBS
WEIGHT(TONS)
Top Slab
4,538
2.3
Riser 1 Section
0
0.0
Additional Riser Secdon
0
0.0
VortSente Section Includes Inlet/Outlet Sleeve
16,194
8.1
Riser 2 Section
7,239
3.6
Base Section
10,060
5.0
Base Extension or Anti -floatation Collar
0
0.0
OverlyIng Saturated Soil
0
0.0
Ovedying Unsaturated Soil
4,943
2.5
Weight of water In tank
0
0.0
TOTAL 42,974 21
Assumes tank is empt
Hei ht of Water Table Above Bottom of Tank (ft); 13.28
Corresponding Water Table Elevation (ft): 48.0
Volume of Water Displaced by Tank (ft): 536
BouYancy Force of Displaced Water X 15% FOS: 38,434
Net Bouyancy Force Down (Ibf): 4,540
Calculated Br. JLS 4/18/2006 Checked By:

06/20/2006 13:25 8663768511 CONTECH STORMWATER
PAGE 07/11
�7 e-)3--
VortSentry® Stage Discharge Calculations
Meadowview Elementary School
m
Onslow County, NC
STORNMlATI R
Model VS40t
SOLUTIONS_
System Go OQ.0
Treatment Chamber Outlet Orifice
Flow Partition Weir
Orifice Area (ft2) =
0.180
Crest El. (ft) =
0.83
Discharge Coefficlent =
0.56
Weir Crest Length (ft) =
0.93
Discharge Coefficient =
3.33
Head
Elevation
Treatment Flow
Bypass Flow Rate
Total Flow Rate
(ft)
(ft)
cfs
(cfs)
(cfs
Gov. 0.25
47.35
0.2
0
0.2
0.50
47.60
0.3
0
0.3
0.75
47.85
0.5
0
0.5
1.00
48.10
0.6
0.2
0.8
1.25
48.35
0.7
0.8
1.5
1.50
48.60
0.8
1.6
2.4
1.75
48.85
0.8
2.7
3.5
2.00
49.10
0.9
3.8
4.7
2.25
49.35
1
5.2
6.2
2.50
49.60
1
6.6
7.6
2.75
49.85
1.1
8.1
9.2
3.00
50.10
1.2
9.8
11
3.25
50.35
1.2
11.5
12.7
3.50
50.60
1.3
13.3
14.6
3.75
50.85
1.3
15.3
16.6
Calculated b :
JLS Date:
4/18/2006
Checked By:
Date:
Stage Discharge
18.0
_
i
16.0�
14,0
IBM
10.0
r } Fx
gt -
-� Q treatment
_ . .. Q total
l
K
4 r a te, • Of
6.0
4.0
2.0
0.00
0.50 1.00 1.50 2.OD 2.50 3.00 3.50 4.00
Head (ft)
21401 GADS
6/20/2006

06/20/2006 13:25 8663768511 CONTECH STORMWATER PAGE 08/11
VortSentryo Net Annual TSS Removal Efficiency Estimate
��
Meadowview Elements School
'y ,I"
Onslow County, NC
��
STORMWATER
Model VS40
�����Min
SOLUTIONS_
System G = t4
Design Ratio'
0.5 acres x 0.9
0.009
50 ft3
Rainfall Intensity
!Flow Rate
Operating Ratez
% Total Rainfall
Rmyl. Effcy_'
-
Rai. Effcy
-
efs
De th'
"/hr
cfs/ft'
%
%
0.02
0.01
0.00018
4.4%
98.0%
4.3%
0.04
0.02
0.00036 1
4.8%
98.0%
4.7%
0.06
0.03
0.00054
5.2%
98.0%
5.1 %
0.08
0.04
0.00072
4.6%
96.9%
4.5%
0.10
0.05
0.00090
4,0%
96.9%
3.9%
0.12
0.05
0,00107
3.5%
96.9%
3.4%
0.14
0.06
0.00125
3.7%
96.9%
3.6%
0.16
0.07
0.00143
3.5°%
95.8%
3.3%
0.18
0.08
0.00161
3.2%
95.8°%
3.0%
0.20
0.09
0.00179
3.2%
95.8°%
3.0%
0.25
0.11
0.00224
6.2%
94.7%
5.8%
0.45
0.20
0.00403
18.4%
91.4°%
16.8%
0.65
0.29
0.00582
10.7%
85.9%
9.2%
0.85
0.38
0.00761
6.8°%
83.2%
5.6%
1.00
0.45
0.00895
6.1 °%
82.4%
5.0%
1.25
0.56
0.01119
3.3%
80.8°%
2.7%
1.50
0.68
0.01343
3.8%
75.7%
2.9°%
1.75
0.79
0.01567
1.5%
67.0%
1.0%
2.00
0.90
0.01790
0.7%
58.3%
0.4%
2.25
1.01 1
0.02014
0.5% 1
57.0% 1
0.3%
2.50
1.13
0.02238
0.5% 1
55.7%
0.3%
Net Annual TSS Removal Efficient = 89%
1 - Design Ratio (Total Drainage Area x Runoff Coefficient) / VortSentry Treatment Volume
= The Total Drainage Area and Runoff Coefficient are specified by the site engineer.
2 - Operating Rate (cfsW) = Rainfall Intensity ("/hr) x Design Ratio
3 - Based on 10 years of rainfall data from NCDC station 9457, Wilmington WSO Airport, New Hanover County, NC
- Removal efficiencies are based on Vortechnics laboratory verified removal of OK-110, a commercially available
silica gradation with a mean particle size of 110 microns, containing particles ranging from 53-150 microns.
Calculated by JLS Date: 04/18/06 Checked by: Date.
21401 GADS 6/20/2006

06/20/2006 13:25 8663768511 CONTECH STORMWATER PAGE 09/11
VortSentry® Bouyancy Calculation Results
A - Meadowvlew Elementary School
VII Win Onslow County
sroRMAHR Model VS40
sol.unaNL System G : to • 4�
VortSentryo Geometric S ecfflcations: VortSent Section Heights:
Manhole Inside Diameter ft :
1 4
Riser 1 Section ft :
0
Manhole Outside Diameter (ft):
4.83334
Additional Riser Section (ft):
0
Wall Thickness R :
0.41667
VortSent Section M
4
To Slab Thickness (ft):
0.45833
Riser 2 Section ft :
2.67
Base Slab Thickness (ft):
0.66667
Base Section (ft.
3.33
Inlet Pipe Diameter (ft):1
1.5
1 Base Extension Width ft :
0.00
Properties of Materials Ibslft
Unit Weight of Concrete: 150
Unit Weight of Aluminum: 167
Unit Weight of Water. 62