SW8050216_COMPLIANCE_20050520

STORMWATER DIVISION CODING SHEET
POST -CONSTRUCTION PERMITS
PERMIT NO.
SW Laf/%r2l(//
DOC TYPE
El CURRENT PERMIT
❑ APPROVED PLANS
❑ HISTORICAL FILE
COMPLIANCE EVALUATION INSPECTION
DOC DATE
YYYYMMDD

slzvl o 5 re V..� I
Permit No. S L) R 0 2
(to be provided by DWQ)
State of North Carolina Department of Environment and Natural Resources Division of Water Quality
STORMWATER MANAGEMENT PERMIT APPLICATION FORM
UNDERGROUND INFILTRATION TRENCH SUPPLEMENT
This form may be photocopied far use as an original
DWO Stormwater Management Plan Review: A complete stormwater management plan submittal includes a
stormwater management permit application, an underground infiltration trench supplement for each system, design
calculations, and plans and specifications showing all stormwater conveyances and system details.
I. PROJECT INFORMATION
Project Name: Fore Christ Ministries
Contact Person: Decarol Williamson — Phone Number: [phone]
For projects with multiple infiltration systems, a supplement form must be completed for each system. This worksheet
applies to: Trench Bed 2 — (Front) in Drainage Area 2
(from plans) (from Form SWU-101)
II. DESIGN INFORMATION (attach supporting calculations/documentation): Soils Report Summary
(based upon an actual field investigation and soil borings)
Soil Type Sand
Infiltration Rate 90 in/hr r cf/hr/sf (circle appropriate units)
SHWT Elevation 48' — 49' sl (Seasonal High Water Table elevation)
Trench Design Parameters
Design Volume 3,851.4 c.f
Design Storm 1.5 inch event (1.5 inch event far SA waters, 1 inch event for others)
Drawdown Time < I hour
Perforated Pipe Size 10 inch diameter
Perforated Pipe Length 4,300 ft.
No. Observation Wells 1 (may be required on a case -by -case basis)
Stone Type #57 Clean Washed (if used)
Stone Void Ratio 0.4
Trench Elevations (in feet mean sea level)
Bottom Elevation 50.00' finsl
Storage/Overflow Elevation 6' finsl
Form SW-107 Rev 3.99 Pagel of 4

Trench Dimensions
Height ft.
Width 93.2 ft.
(see plans for trench details)
III. REQUIRED ITEMS CHECKLIST
Length 100 ft.
Volume Provided 3851.4 cu.ft.
The following checklist outlines design requirements per the Stormwater Best Management Practices manual
(N.C. Department of Environment, Health and Natural Resources, November 1995) and Administrative Code
Section: 15 A NCAC 2H .1008.
Initial in the space provided to indicate that the following design requirements have been met and supporting
documentation is attached. If the applicant has designated an agent in the Stormwater Management Permit
Application Form, the agent may initial below. Attach justification if a requirement has not been met.
Applicants Initials
a. rQ4 System is located 50 feet from class SA waters and 30 feet from other surface waters.
b. System is located at least 100 feet from water supply wells.
c. _.7ie Bottom of system is at least 2 feet above the seasonal high water table.
d.D00 Bottom of the system is 3 feet above any bedrock or impervious soil horizon.
e._O�P Off --line system, runoff in excess of the design volume bypasses the system (bypass detail provided).
f.COO, System is designed to draw down the design storage volume to the proposed bottom elevation under
seasonal high water conditions within five days based upon, infiltration through the bottom only (a hydrogeologic
evaluation may be required).
g.Q�10_ Soils have a minimum hydraulic conductivity of 0.52 inches per hour.
h.7C�_' System is not sited on or in fill material or DWQ approval has been obtained.
i.ZCQ Plans ensure that the installed system will meet design specifications (constructed or restored) upon initial
operation once the project is complete and the entire drainage area is stabilized.
J. IC4 System is sized to take into account the runoff at the ultimate built -out potential from all surfaces draining
to the system, including any off -site drainage.
k. _IX .-System is located in a recorded drainage easement for the purposes of operation and maintenance and has
recorded access easements to the nearest public right-of-way.
1. Re System captures and infiltrates the runoff from the first 1.0 inch of rainfall (1.5 inch event for areas
draining to SA waters ).
m. Drainage area for the device is less than 5 acres.
n.X_A pretreatment device ( filter strip, grassed swale, sediment trap, etc.) is provided.
o. 0,CV— Trench bottom is covered with a layer of clean sand to an average depth of 4 inches.
p. 31L Sides of the infiltration trench are lined with geotextile fabric.
q.0CW_ Rock used is free of fines (washed stone) and has a large void ratio.
r. _.BW _Side to bottom area ratio is less than 4:1.
S. Observation well(s) are provided (case -by -case basis).
t.Vegetated filter is provided for overflow (50 feet for SA waters, 30 feet for other waters) and detail is
shown on plans.
u. (i A benchmark for checking sediment accumulation is provided.
Form SWU-107 Rev 3.99 Page 2 of 4

IV. UNDERGROUND INFILTRATION TRENCH OPERATION AND MAINTENANCE
AGREEMENT
1. After every runoff producing rainfall event and at least monthly inspect the bypass/overflow structure for
blockage and deterioration and the infiltration system for erosion, trash accumulation, grass cover, and general
condition.
2. Repair eroded areas immediately, re -seed as necessary to maintain adequate vegetative cover, mow vegetative
cover to maintain a maximum height of six inches, and remove trash and blockages as needed to maintain system
performance.
3. Remove accumulated sediment annually or when depth is reduced to 75% of the original design depth.
Restore depth to original design depth without over -excavating. Over -excavating may cause the required water table
separation to be reduced and may compromise the ability of the system to perform as designed.
4. The water level in any monitoring wells will be recorded after a I inch rainfall event and at least once a month.
Chronic high water table elevations (within 1 foot of the bottom of the system for a period of three months) shall be
reported to DWQ immediately.
5. If DWQ determines that the system is failing, the system will immediately be repaired or replaced to original
design specifications. If the system cannot be repaired to perform its design function, other stormwaier control devices
as allowed by NCAC 2H .1000 must be designed, approved and constructed.
6. Remove accumulated sediment from the infiltration system annually or when depth in the unit is reduced
to 75% of the original design depth. The system shall be restored to the original design depth without over -
excavating. Over -excavating may cause the required water table separation to be reduced and may compromise
the ability of the system to perform as designed. Removed sediment shall be disposed of in an appropriate
manner and shall not be handled in a manner that will adversely impact water quality (i.e. stockpiling near a
stormwater treatment device or stream, etc.).
A benchmark shall be established in the infiltration system. The benchmark will document the original design
depth so that accurate sediment accumulation readings can be taken. The measuring device used to determine the
depth at the benchmark shall be such that it will give an accurate depth reading and not readily penetrate into
accumulated sediments.
When the depth at the benchmark reads,
from the system.
Form SWU-107 Rev 3.99 Page 3 of 4
the accumulated sediment shall be removed

I acknowledge and agree by my signature below that I am responsible for maintaining the stormwater
collection system in accordance with the six maintenance procedures listed above. I agree to notify DWQ
of any problems with the system or prior to any changes to the system or responsible parry.
Print Name and Title: _f_)� e-Q
Address: � i. L 'd Q UJ U L t 1�}', i ..V\ ; UOs
Phone: G 0 Date: S
Signature:
Note: The legally responsible party should not be a homeowners association unless more than 50% of the lots have been sold and a
resident of the subdivision has been named the president.
I, ,, {{ S�G rfA A il rvJ411a\Notary Public for the State of , County of
tU do hereby certify that _ �J e CraOl W : Ul rn, _Y-_Vn personally appeared before me this Y{
day of ,and acknowledge the due execution of the forgoing infiltration basin maintenance
requirements. Witness y hand and official seal,
t c SV S
My, commission expires
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Fore Christ Ministries
Hydrologic and Hydraulic Calculations
Revised
May 2005
R CEIVED
MAY 10 2005
Prepared by: SW 8 O jJ6
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MAY'
East Coast
Engineering Company, P.A.
Consulting Engineers
Shallotte, North Carolina 28459
Post Office Box 2469 4918 Main Street
Office: 910,754,8029

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STORMWATER INFILTRATION TRENCH DESIGN CALCULATION {10 INCH PIPE)
FORE CHRIST MINISTRY
I AREA INFORMATION . I
Impervious Area 54501 SF.
Percent Impervious 20 %
Soil Type SAND ,
Infiltration Rate / .5 IN / MIP
Infiltration Rate Vr 90 IN / HR
Existing Ground Elevation \ 51.5 FT
SHWT Elevation 48
Design Storm 1.5 IN
Rv Value 0.23 FT
Volume Required �----R.-8 2- —31 CF
DISTRIBUTION PIPES
Perforated Pipe ID 9.90 IN
Perforated Pipe OD 11.36 IN
Trench Width �2kir7, FT
Distance Between Pipes IIIIIIIIIIIIIIIIIIII�j4!64 IN
Trench Height � 1436 FT
Void Ratio (WASHED STONE)l�OTg
Volume per Linear Foot for Stone 0.361 CF
Volume per Linear Foot for Pipe 0.535 CF
Volume Per Linear Foot for Trench 0.896 CF
Total Volume Provided �8,t 51; CF
Hegwred VS. Provided Volume OK
Drawdown Time 0.190 HOURS
Drawdown Time Below 5 Days OK
IMPERVIOUS DATA
13173 Buildings
19027 Parking
21017 Drive r
1284 Sidewalk
i r r Future Impervious
54501 Total
�ED 1 ,
Number of Trenches 2D
Length of each Trench 240 FT
Width of each Trench 2.17 FT
Trench bed total width 43.3 FT
Height of each Trench 16.36 IN
Volume Provided 4299.2 CF
# 57 stone volume req'd. 10800 CF
BED 2
Number of Trenches
43
Length of each Trench
100
FT
Width of each Trench
2.17 FT
Trench bed total width
93.2 FT
Height of each Trench
16.36 IN
Volume Provided
3851.4 CF
# 57 stone volume req'd.
9675 CF
BED 3
Number of Trenches
Length of each Trench
FT
Width of each Trench
FT
Trench bed total width
FT
Height of each Trench
IN
Volume Provided
0.0 CF
# 57 stone volume req'd.
0 CF
Total Volume Provided 8150.6 CF
Total Rock Vole Re 'd 20475 CF
Volume
Psi. . (Ib/ft') 98.5 1008 TONS
119
r
1K ray a?eo
BED 4
Number of Trenches
Length of each Trench
FT
Width of each Trench
FT
Trench bed total width
FT
Height of each Trench
IN
Volume Provided
0.0 CF
# 57 stone volume req'd.
0 CF
BED 6
Number of Trenches
Length of each Trenchl
FT
Width of each Trench
FT
Trench bed total width
FT
Height of each Trench
IN
Volume Provided
0.0 CF
# 57 stone volume req'd.
0 CF
BED 6
Number of Trenches
Length of each Trench
FT
Width of each Trench
FT
Trench bed total width
FT
Height of each Trench
IN
Volume Provided
0.0 CF
# 57 stone volume req'd.
0 CF
Page 1 of 1 Rev.5/6/2005

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TRENCH BED CROSS SECTION 10" SYSTEM (BED 1 - REAR)
TOP PVMNT MIN., 52.53
6" ROCK FILL TOP, 52.37
4" FILL DIRT TOP, 51.87
#57 STONE TOP, 51.53
---------------------------------------------------------------
PIPE TOP, 51.28
#57 STONE BED TOP, 50.34

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TRENCH BED CROSS SECTION 10" SYSTEM (BED 2 - FRONT)
TOP PVMNT MIN., 52.36
6" ROCK FILL TOP, 52.20
L =� = =� = =�= = �
4" FILL DIRT TOP, 51.70
#57 STONE TOP, 51.36
----------------------------------------------------------------
PIPE TOP, 51.11
- — - .-., - — - — - — - — - — - — - -- - — - — - — - — - — - — - — - — - — - — - — - �
#57 STONE BED TOP, 50.17

Fore Christ Ministry
Catch Basin Drainage Flow Calculations
East Coast Engineering Company, PA
JCR
Qao.SD=5', Drainage Area =
Drainage Area =
Design Storm =
Surface
Asphalt/Rooftop
Grass
Total A'
Weighted 'C'
Q; = C i'A
Q to SD=3 Drainage Area
Drainage Area =
Design Storm =
Surface
Asphalt/Rooftop
Grass
Total A'
Weighted 'C'
Q;=CIA
Q to SD 1 Drainage Area =
Drainage Area =
Design Storm =
Surface
Asphalt/Rooftop
Grass
Total A'
Weighted 'C'
Q; = CIA
28,019 SF QaoSD 4• Drainage Area = 5,994 SF
0.64 Acres Drainage Area = 0.14 Acres
10 -YR storm Design Storm = 1 10 -YR storm
Acres C ValueSurface Acres C-Value�'�
10.64 0.95 Asphalt/Rooftop 0.14 0.95
0.00 0.2 Grass 0.00 0.2
0.64323 Total A' 0.1376
0.95 Weighted 'C' 0.95
{,4.33857 cfs Q, = C iA 092813 is
2,764 SF Q;to SD 2' Drainage Area = 21,461 SF
0.06 Acres Drainage Area = 6.49 1 Acres
10 -YR storm Design Storm = i 0 -YR storm
Acres C- Value rr� Surface Acres C-Valuer'
0.06 0.95 Asphalt/Rooftop 0.49 0.95
0.00 0.2 Grass 0.00 0.2
0.06345 Total 'A' 0,49268
0.95 Weighted 'C' 0.95
42_799 cfs Q; = C rA 3?3231 cfs
95,453 SF
0.13 Acres
10 -YR storm
Acres C-Value�r�
0.13 0.95
0.00 0.2
0.12518
0.95
FT4�436 cfs
(1) Table 8.03a; (2) Figure 8.03a; (3) Figure 8.03b of the NCDENR Erosion and Sediment Control Planning and Design Manual. Revision Date: 5/9l2005

Fore Chris Ministry
Storm Drain Pipe Calculations
East Coast Engineering Company, PA
JCR
Box ID
Total 0
Upstream Pipe
Downstream
Pipe
Pipe Size
Type Pie
"n" Value
Slope %
Flow
Area
(SF)
Wetted
Perimeter
(FT.)
Hydraulic
Radius
I (FT.)
Velocity
I (FPS)
o MAX
CHECK
SD8
3.32
SD1
OUTLET
15
HDPE
0.012
2.67%
1.23
3.93
0.31
9.32
11.43
OK
SD7
4.34
SD3 , SD4
OUTLET
15
HDPE
0.012
1.92%
1.23
3.93
0.31
7.90
9.69
OK
SD6
4.34
SD3 , SD4
FRONT BED
15
HDPE
0.012
0.40%
1.23
3.93
0.31
3.61
4.42
OK
SD5
4.34
SD3 , SD4
SD6
15
HDPE
0.012
0.40%
1.23
3.93
0.31
3.61
4.42
OK
SD4
0.93
SD3 , SD4
SD5
15
HDPE
0.012
0.40%
1.23
3.93
0.31
3.61
4.42
OK
SD3
0.43
NONE
SD4
15
HDPE
0.012
0.40%
1.23
3.93
0.31
3.61
4.42
OK
SD2
3.32
NONE
REAR BED
15
HDPE
0.012
0.40%
1.23
3.93
0.31
3.61
4.42
OK
SD1
0.84
NONE
REAR BED
15
HDPE
0.012
0.40%
1.23
3.93
0.31
3.61
4.42
OK
Revision Date. 5/9/2005

SD -1
� SD -2
I
I

INFlrTRAT ON TRENCH ANALYSIS
Project # SW 8 050216-1
Project Name Fore Christ Ministries
Recvng Stream Shingletree Swamp
Drainage Basin Lumber
Site Area 6.22 acres
Drainage Area 1: "Bed 1- Rear"
Impervious Area Calculation
Buildings 13173
Parking/Streets 14320
Sidewalks
OS Future Alloc.
Total '€7483
Volume/Storage Calculation -
Filename: S:IWPDATAIWQSIINTRENCH1050216-1
Date 25-May-05
Reviewer P.Bartlett
*Classification C u" (� " ,j .yi 0')
Index # 15-23-2 0 `]" L
Drainage Area 56113 SF
outside the 575' AEC
if Rational Method is used, place a 1 in this box 0
Required
Design Storm
RV
Volume tv.�fo
Provided
Pipe Diameter
Length Of a Single run of Pipe
Number of Pipe Runs in Trench
Storage In Piping
Total Storage in Piping
Cross -Sectional Area Of Pipe Runs
Length Of Trench
I Width Of Trench
Height Of Trench
Cross -Sectional Area Of Trench
Voids Volume, 40%
Trench Volume per linear foot
Minimum Trench length required
Total Volume Provided
Elevation Of Bottom Of Trench
Elevation Of SHWT
Overflow Elevation
Exfiltration Rate / Drawdown
Reported Hydraulic Conductivity
Bottom Surface Area
25 YEAR 24 HOUR STORM NIA
Intensity, i = .33 inches 1 hour
Qr=CIA=
Qp through the bottom of the basin=
1.29 Acres
Rational Cc (list C after each BUA)
0.95
0.95
% Impervious: 49.0%
Cc: 0.57
1.5 in
0.49
3.0 CF Vf h99 P1.
Pipe Size 1 Pipe Size 2
0.833 Feet
240 Feet
20
2616 Cubic Feet
26i6€ Cubic Feet
10.900
240 Feet
43.3 Feet
1.36 Feet
58.89 SF
F6; CF
Cubic Feet
€932 Feet
7223: Cubic Feet
50.17 Mean Sea Level
48.17 Mean Sea Level
51.53 Mean Sea Level
7.5 Cubic Feet Per Hour Per Sq Ft
10392 Square Feet
:00::1 hours
0.24 CFS
21.6500 CFS Must be > Qr
10 YEAR 10 MIN HIGH INTENSITY EVENT
Intensity, i = 6.3 inches 1 hour
Volume for 10 yr. 10 min. event =
2763.18 CF < 7223 CF

INFI�TRAT ON TRENCH ANALYSIS Filename: S:IWPDATAIWQSIINTRENCH1050216-2
Project # SW8 050216-2
Project Name ,Fore Christ Ministries
Recvng Stream Shingletree Swamp
Drainage Basin Lumber
Site Area 6.22 acres
Drainage Area 2: "Bed 2- (Front)"
Impervious Area Calculation
Buildings
a Parking/Streets 25724
i Sidewalks 1284
OS Future Alloc.
Total �27p[38
Volume/Storage Calculation'
Date
Reviewer
*Classification
Index #
Drainage Area
* outside the 575' AEC
If Rational Method is used, place a 1 in this box
Required
Design Storm
RV
V luthe to€;Stole
Provided
Pipe Diameter
Length Of a Single run of Pipe
Number of Pipe Runs in Trench
Storage In Piping
Total Storage in Piping
Cross -Sectional Area Of Pipe Runs
Length Of Trench
Width Of Trench
Height Of Trench
Cross -Sectional Area Of Trench
Voids Volume, 40%
Trench Volume per linear foot
Minimum Trench length required
Total Volume Provided
Elevation Of Bottom Of Trench
Elevation Of SHWT
Overflow Elevation
Exfiltration Rate / Drawdown
Reported Hjdraulic Conductivity
Bottom Surface Area
ps~ew+Eiowr €1' rie
25 YEAR 24 HOUR STORM NIA
Intensity, i = .33 inches I hour
Qr=CiA=
Qp through the bottom of the basin=
25-May-05
P.Bartlett
C
15-23-2
52222 SF
1.20 Acres
Rational Cc (list C after each BUA)
0.95
0.95
% Impervious= 51.7%
Cc: 0.59
1.5 in
0.52
i�5$ CF
Pipe Size 1 Pipe Size 2
0.833 Feet
100 Feet
43
2343 Cubic Feet
a € 3 _.$! Cubic Feet
23.434
100 Feet
93.2 Feet
1.36 Feet
126.75 SF
4.133`
CF
Cubic Feet
Feet
Cubic Feet
54G
i=€6476
0.23 CFS
19.4167 CFS
50 Mean Sea Level
48 Mean Sea Level
51.36 Mean Sea Level
7.5. Cubic Feet Per Hour Per Sq Ft
9320 Square Feet
€Qsi) hours
Must be > Or
10 YEAR 10 MIN HIGH INTENSITY EVENT
Intensity, i = 6.3 inches i hour
Volume for 10 yr. 10 min. event =
2664.08 CF <
6476 CF