SW8060742_COMPLIANCE_20060927

STORMWATER DIVISION CODING SHEET
POST -CONSTRUCTION PERMITS
PERMIT NO,
SW eag (2
DOC TYPE
❑ CURRENT PERMIT
❑ APPROVED PLANS
❑ HISTORICAL FILE
COMPLIANCE EVALUATION INSPECTION
DOC DATE
YYYYM M DD

W a
O -C
September 7, 2006
Mr, Brian K. Keesee
BKK Construction, Inc.
8300 E. Oak Island Drive
Oak Island, NC 28465
Subject:- Request for Additional Information
Stormwater Project No. SW8 060742
Oak Island Building Supply
Brunswick County
Dear Mr. Keesee:
Michael F. F;aslcp, Governor
William G. Ross 1r., Secretary
North Carolina Department of Frivironment and Natural Resources
Alan W, Klimek, P.E. Director
Division of Water Quality
The Wilmington Regional Office received some of the previously requested additional
information regarding the pending Stormwater Management Permit Application for Oak Island
Building Supply on August 10, 2006. A preliminary review of the submitted information has
determined that the application is not complete. The following information is needed to
continue the stormwater review:
The Secretary of State has no listing for BKK Construction, Inc. They do have a
listing for Brian Keith Keesee Construction, Inc. It is extremely important that an
accurate corporate name be provided on the application. If Brian Keith Keesee
Construction, Inc., is the corporate name listed with the Secretary of State, then
that'is what you need to put on the application. Your title within the corporation is
also very important. The annual reports filed with the Secretary of State indicate
that you are the President of Brian Keith Keesee Construction, Inc. Please
provide a correct corporate name on the application and your title within the
corporation.
2. On sheets 01.0 and 01.1, in DA #2, the Stormtech system is obscuring the line
demarcating the limits of the parking lot pavement and one side of the access
drive.
3. Please eliminate the "rock boxes" for the roof drains. The runoff from the roof
drains should be directly connected to the Stormtech system therefore no rock
boxes are needed.
4. On page 4 of the application, several things have been left blank. Please date
your signature. Please initial the 5 blank lines at the top right, and please
complete Section VII with the name, address and phone number of your
consultant, J.W. Huggins, P.E. I am returning the original signature page
received on July 27, 2006, to Mr. Huggins. Please make the necessary additions
and either return the original page or provide a new original.
5. 1 have made a few changes to the supplements, which better reflect the
proposed condition. Please note that the trench height has been revised to 4'
because the 12" of stone above the Stormtech chamber cannot be counted as
storage volume.
No
Onc
rihCarolina
Alatura!!y
North Carolina Division of Water Quality 127 Cardinal Drive Extension Wilmington, NC 28405 Phone [phone] Customer Service
Wilmington Rcgional Office [nternet: www.ncwaterqu<ality.o g Fax [phone]
An Equal Opportunity/Affirmative Action Employer - 50% Recycled110% Post Consumer Paper

Mr. Keesee
July 31, 2006
Stormwater Application Noo.SW$ 060742
6. Please provide original signatures for all documents. The Division is
unable to accept photocopied signatures. i can use the original signature
pages of the supplement forms that were received on July 27, 2006 with
the revised pages 1 & 2 of each infiltration trench supplement that were
received on August 10, 2006.
7. Please label NC 133 south of NC 211, on the vicinity map.
Please note that this request for additional information is in response to a preliminary
review. The requested information should be received in this Office prior to September
21, 2006, or the application will be returned as incomplete. The return of a project will
necessitate resubmittal of all required items, including the application fee.
If you need additional time to submit the information, please mail or fax your request for
a time extension to the Division at the address and fax number at the bottom of this
letter. The request must indicate the date by which you expect to submit the required
information.
The construction of any impervious surfaces, other than a construction entrance under
an approved Sedimentation Erosion Control Plan, is a violation of NCGS 143-215.1 and
is subject to enforcement action pursuant to NCGS 143-215.6A.
Please reference the State assigned project number on all correspondence. Any
original documents that need to be revised have been sent to the engineer or agent. All
original documents must be returned or new originals must be provided. Copies are not
acceptable. If you have any questions concerning this matter please feel free to call me
at [phone].
Sincerely,
Linda Lewis
Environmental Engineer
ENBlarl: S:IWQSISTORMWATERIADDINF0120061060742.sep06
cc: J.W. Huggins, P.E.
Linda Lewis
Page 2 of 2

VI. SUBMITTAL REQUIREMENTS
Only complete application packages will be accepted and reviewed by the Division of Water Quality (DWQ).
A complete package includes all of the items listed below. The complete application package should be
submitted to the appropriate DWQ Regional Office.
Please indicate that you have provided the following required information by initialing in th pac rovided
next to each item.
Initial f
• Original and one copy of the Stormwater Management Permit Application Form
• One copy of the applicable Supplement Form(s) for each BMP
• Permit application processing fee of $420 (payable to NCDENR)
• Detailed narrative description of stormwater treatment/management
• Two copies of plans and specifications, including:
Development/Project name
F..ngineer and firm
-Legend
North arrow
Scale
Revision number & date
Mean high water line
Dimensioned property/project boundary
Location map with named streets or NCSR numbers
Original contours, proposed contours, spot elevations, finished floor elevations
Details of roads, drainage features, collection systems, and stormwater control measures
Wetlands delineated, or a note on plans that none exist
Existing drainage (including off -site), drainage easements, pipe sizes, runoff calculations
Drainage areas delineated
Vegetated buffers (where required)
lll. AGENT AUTHORIZATION
J
If you wish to designate authority to another individual or firm so that they may provide information on your
behalf, please complete this section.
Designated agent (individual or firm):
Mailing Address:
City:
Phone: { ]
VIII. APPLICANT'S CERTIFICATION
State:
Fax: ( )
W
1, (print or type name of person listed in General Information, item 2)
certify that the information included on this permit application form is, to the best of my knowledge, correct and
that the project will be constructed in conformance with the approved plans, that the required deed restrictions
and protectivegQvenantsLwile-orded, and that the proposed project complies with the requirements of 15A
NCAC 211
Signature: Date: '1
Form SWU-101 Version 3.99 Page 4 of

Permit No.
(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 for 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. PROTECT INFORMATION
Project Name :
Contact Person: _�_r . A rN t-R- 5-e— P Phone Number.
For projects with multiple infiltration systems, a supplement form must be completed for each system. This
worksheet applies to: Trench _ A. in Drainage Area O 1,.
(from plans) (from Form SWU-1 p1)
II. DESIGN INFORMATION (attach supporting calculations/documentation):
Soils Report Summary (based upon an actual field investigation and soil borings)
Soil Type AQ. a."a 4-0 r.-I-e - Sore
Infiltration Rate _ 1 4A G or cflhrlsf (circle appropriate units)
SHWT Elevation _ ) (A. S t finsl (Seasonal High Water Table elevation)
Trench Design Parameters
Design Volume 15 c2r2n c f L 3�� b S +0
�I '-o- .
Design Storm 4VS inch event (1.5 inch event ors. waters, I inch event far others)
Drawdown Time 1.7r days
7 S To60— r-
Perforated Pipe Size inch/diameter
Perforated Pipe Length I�b �' i- _ ft• C, �13 5� C� n++,S
No. Observation Wells 3 (may be required on a case -by -case basis)
Stone Type (if used) # Jr -7-
,77zx.) G'
Stone Void Ratio �`^ (40o
q'1r
Trench Elevations (in feet mean sea level)
Bottom Elevation fmsl
Storage/Overflow
� Elevation �� + 5 fmsl
r
Form SWU-107 Rev 3.99 Page 1 of 4

Trench Dimensions ZL
Height _ L ft.
Width
025(fi-c.d (-C �)Aa fbpor-di e
III. REQUIRED ITEMS CHECKLIST
Length
Volume Provided
Storrn fed? ch2r,� b&-,
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. System is located 50 feet from class SA waters and 30 feet from other surface waters.
b. System is Iocated at least 100 feet from water supply wells.
c. Bottom of system is at least 2 feet above the seasonal high water table.
d. Bottom of the system is 3 feet above any bedrock or impervious soil horizon.
ftj�— -
I K e.
Off-line system, runoff in excess of the design volume bypasses the system (bypass detail
provided). A 3" de-51 y-7 ShZ -m r'S
11
f.
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.
Soils have a minimum hydraulic conductivity of 0.52 inches per hour.
h.
System is not sited on or in fill material or DWQ approval has been obtained.
i.
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.
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.
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.
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.
A pretreatment device ( filter strip, grassed swale, sediment trap, etc.) is provided.
Ark o.
Trench bottom is covered with a layer of clean sand to an average depth of 4 inches.
kkp. Sides of the infiltration trench are lined with geotextile fabric.
Mr q. Rock used is free of fines (washed stone) and has a large void ratio.
r. Side to bottom area ratio is less than 4:1.
Form SWU-107 Rev 3.99 Page 2 of 4

As. 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.
R u. A benchmark for checking sediment accumulation is provided.
IV. UNDERGROUND INFILTRATION TRENCH OPERATION AND MAINTENANCE AGREEMENT
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 I 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 stormwater 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 U. (PZ5 , the accumulated sediment shall be removed
from the system.
r
75
2. S' I. F-7S . (� 25'
Form SVM-107 Rev 3.99 Page 3 of A

Permit No. Sou 0
(to be provided by DWO
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 for 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_
1. PROJECT INFORMATION
Project Name:
; IA"., � S v
Contact Person: b r 4 a rn f C 4e—4.-t-e— Phone Number: LI JQ J - SA IS
For projects with multiple infiltration systems, a supplement form must be completed for each system. This
worksheet applies to: Trench -L in Drainage Area 61
(from plans) (from Form SWU-101)
11. DESIGN INFORMATION (attach supporting calculations/documentation)-
Soils Report Summary (based upon an actual field investigation and soil borings)
Soil Type
��-�U� +0 P'^e, so -%A
Infiltration Rate
�
or cf/hr/sf (circle appropriate units)
SHWT Elevation
. AS
fmsl (Seasonal Nigh Water Table elevation)
Trench Design Parameters
31512
V�
Design Volume
c.f.
Design Storm
. + -S _3
inch event (1.5 inch event for SA waters, I inch event for others)
Drawdown Time
Perforated Pipe Size
days
inch d ameter
Perforated Pipe Length
!J 1
ft 44
No. Observation Wells
`Z-
(may be required on a case -by -case basis)
Stone Type (if used)
* S 4
11
`r`� �v m� ���7
Stone Void Ratio
Trench Elevations (in feet mean sea level)
Bottom Elevation 16,S fmsl '
Storage/Overflow Elevation fmsl
Form SWU-107 Rev 3.99 Page 1 of 4

Trench Dimensions y I1ti
Height ft. Length " b ft
Width fl. Volume Provided 35q b cu.ft.
III. REQUIRED ITEMS CHECKLIST
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.
Initials
a. 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. Bottom of system is at least 2 feet above the seasonal high water table.
d. Bottom of the system is 3 feet above any bedrock or impervious soil horizon.
e. Off-line system, runoff in excess of the design volume bypasses the system (bypass detail
provided).
f. , 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. Soils have a minimum hydraulic conductivity of 0.52 inches per hour.
h. System is not sited on or in fill material or DWQ approval has been obtained.
Ali. 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. 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. 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.
_4� I. System captures and infiltrates the runoff from the first 1.0 inch of rainfall (1.5 inch event
for areas draining to SA waters ).
kAm. Drainage area for the device is less than 5 acres.
AAn. A pretreatment device ( filter strip, grassed swale, sediment trap, etc.) is provided.
o. Trench bottom is covered with a layer of clean sand to an average depth of 4 inches.
p. Sides of the infiltration trench are lined with geotextile fabric.
q. Rock used is free of fines (washed stone) and has a large void ratio.
ASr. Side to bottom area ratio is less than 4:1.
Form 5WU-107 Rev 3.99 Page 2 of 4

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. A benchmark for checking sediment accumulation is provided.
IV. UNDERGROUND INFILTRATION TRENCH OPERATION AND MAINTENANCE AGREEMENT
1. After every runoff producing rainfall event and at Ieast 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 wager 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 stormwater 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. L,
When the depth at the benchmark reads e CO25 the accumulated sediment shall be removed
from the system,
Form SWU-107 Rev 3.99 Page 3 of 4

JULf-IA-2t;06 13:28 �From:SWE 9107999958
To:9103502004 P.4/7
S� � ocoo -7qZ
INFILTRATION SITE VISIT REQUEST
Name of the Project: .�s��• d
�v:�1�..,,
S�y�,1,
Location (attach a clear vicinity map):
YxSS
La-1
&Sc L AF04 J �%� ,fc/,mod0 1/G
Stroot address, SR
or, community, olC.
Directions from the nearest major intersection: _A>oot kA-4.
Owner/Applicant Name: KlWrl Klre-a c
Consultant Name: J-W. Ham;--c 41.
Consultant Contact Information: ,9 77"42(. 0 (8WJ 5-9?7- YB _Z�
Phone, fax, email, etc.
or .
Existing ground elev_ @basin/trench=
SHWT elev.=
SHWT plus 2' (max. bottom elev.)=
#1 #2 #3 #4 #5 #6 #7 #8
Date/Time of Soils Investigation: � �a/f� /a _`'3 a
Summary/Comments: j L
c e-A 41r c sl:171-1
All proposed infiltration areas and existing, active utility lines located within the proposed basin/trench
must be marked and flagged. If these areas are not flagged, the Soils Scientist reserves the right to
decline to do the investigation. If the proposed infiltration system will be located in an area of existing
pavement and there is no open area nearby, equipment capable of breaking through the impervious
layer must be provided. The soils investigation does not take the place of a soils report prepared by
an appropriate professional, The Soils Scientist will only verify the soil conditions that are reported in
the Soils Report, and make a determination as to the suitability of the site to meet the infiltration
design requirements under NCAC 2H.1000, and assumes no liability should the system fail.

JUII_,�04006 17:17 From:58ME
.9107999958 To:9103502004 P.3/5
LEGEND
Note: Site plan drawing provided to S&ME by Approximate
J.W. Huggins Engineering personnel. Test Location
SCALE: NOT TO SCALE HAND -AUGER BORING AND DOUBLE RING FIGURE
INFILTROMETER TEST LOCATIONS NUMBER
CHECKED BY: PAM S&ME4265
OAK ISLAND BUILDING SUPPLY
LONG BEACH ROAD
DRAWN BY: JNS ENGINEERING • TESTING OAK ISLAND, NORTH CAROLINA
ENVIRONMENTAL SERVICES
DATE: 7-6-06 1 IS&ME PROJECT NUMBER: 1061-06-236D

INFILTRATION TRENCH ANALYSIS
Filename: - S:IWQSISTORMWATERIEXCELSPREADSHEETSIINTRENCH1060742.sepO6
Project # SW8
060742.sepO6
Original Run Date: July 28, 2006
Project Name
Oak Island Building Supply
Date
07-Sep-06
Receiving Stream
Calf Gully Creek
Reviewer
L. Lewis
Drainage Basin
Cape Fear
Classification:
SC Sw HQW
Site Area
2.29 acres
Index #
CPF17 18-88-9-3-3-1
Impervious Area Calculation
Trench 1
Trench 2
Trench 3
Trench 4
Trench 5
Trench 6
Buildings, sf=
6000
Parking/Street, sf=
76000
8051
Concrete, sf =
Future, sf =
Other, sf =
Total BUA
76000
14061
0
0
01
0
Drainage Area
76000
24000
% Impervious=
100.0%
58.5%
#DIV/O!
#DIV/O!
#DIV/0!
#DIV/O!
Cc=
0.950
0:667
#DIV/O!
#DIV/O!
#DIV/O!
#DIV/O!
Design Storm, in.:
3
3
Rv
0.95
0.58
#DIV/O!
#DIV/O!
#DIVIQ!
#DIV/O!
Req. Volume, cf
18050 <'#DIVIQ+
Pipe 1 'Diameter, ft=
Pipe 1 Run Length,ft
No. of Pipe 1. Runs
0
0
0
0
Stormtech, cf per unit
45.9
45.9
0
0
0
0
# of Stormtech Units
235
44
Length of Trench, ft
334.5
156.5
Width Of Trench,ft
25.25
11
Height Of Trench.ft
4
4
Voids Volume, cf
9199
1947
0
0
0
0
Volume Provided
19986 .;.
; 3966:>
0
: 0:>
0
0
Bottom Elevation
16.5
16.5
SHWT Elevation
14.5
14.5
Overflow Elevation
21.5
21.5
Infiltration Rate,in/hr
14.8
14.8
SA @Bottom , sf
1274
596
0
0
0
0
Drawdown Time, hrs.
11.48 ;:
4 71.'
#DIV14! ..
#DIVIQ! ;
#DIVIQ+::,
#DIVIQ!:,;
25 YEAR 24 HOUR STORM
i = .33 inches
/ hour
Qr= C i A=
0.55
I 0.12
#DIV/O!
#DIV/01
#DIVIQ!
#DIV/01
Qp, bottom of basin=
0.44
l 0.20 I
0.00
0.00
I 0.00 I
0.00
10 YEAR 10 MIN HIGH
INTENSITY EVENT
i = 7 inches
/ hour
Volume =
6961.43
I 1544.21 I
#DIV/01
#DIV/O!
I #DIV/01 I
#DIV/O!

BKK Project - Tc and CN calculations
pre post pre post
Sub Basin - Lot # n 11 1 12 12
1
Total lot area
sgft
Total Lot area - acres
Total lot perimeter
ft
CN Calcs
Area 1 sgft - lot - pervious
sgft
Area 1 CN
n
Area 1 sgft - buildings
sgft
Area 1 CN
n
Area 1 sgft - roads
sgft
Area 1 CN
n
Area 1 sgft
sgft
Area 1 CN
n
Area 1 sgft
sgft
Area 1 CN
n
Sub Basin area
sgMi
Weighted CN
n
Percent Impervious
%
TC Calcs
SHEET FLOW
Sheet Flow Length - L ft
Mann ings for sheetflow - n
2 year 24 hr rainfall - P2 inch
Slope of watershed - S
Sheet Flow TC Hr
SHALLOW FLOW
Shallow Flow Length - L ft
Slope of watercourse - S
Velocity
Shallow Flow TC hr
Triangular section
Slope ZA
Depth ft
Hydaulic Radius ft
Channel flow length
Mannings for sheetflow - n
Slope of watershed - S
Hydraulic Radius ft
Open Channel Flow TC hr
76000
76000
1.7447199 11.7447199
O.0027261
OA02726
39-01
98.0
0.01
100.0
300
200
0.15
0.15
2.4
2.4
0.015
0.015
0.509
0.368
0
100
0.01
0.015
1.6134
1.9760034
0.000
0.014
3
3
2
2
0
0
30
30
0.2
0.2
0.01
0.01
0
0
0.000
0.000
24000
24000
0.550964
10.550964
0.000861
0.000861
39.0
73.5
0.0
58.5
150
100
0.15
0.15
2.4
2.4
0.015
0.015
0.293
0.212
0
5D
0.01
0.015
1.6134
1,976003
O.00D
0.007
3
3
2
2
0
0
30
30
0.2
0.2
0.01
0.01
0
0
0.0001
0.000
r�
Total TC Hr 1 0.5091 1 0.293
Storage Coefficient Hr 1 0,3061 0.2291 1 0.1760.131
RECEIVED
JUL 2 7 2006
DWQ
PROD # 2���Z

01-06-0180
BKK Building Supply
Drainage area 1 Storage -Elevation -Discharge
depth
ft
v
cuft
v
acre-ft
q
cfs
0
0
0
0
0.5
1594
0.0365982
1.01
1
3190
0.0732424
1.11
1.5
6624
0.152087
1.21
2
15674
0.359875
1.31
2.5
17940
0.4119024
1.41
3
19270
0.4424392
1.51
3.5
300001
0.68881
2.46
Drainaqe area 2 Storage-Elevation-Discharqe
depth
ft
v
cuft
v
acre-ft
q
cfs
0
0
0
0
0.5
297.18644
0.0068234
0.279
1
594,74576
0.0136554
0.28
1.5
1234.9831
0.0283552
0.281
2
2922.2712
0.0670953
0.282
2.5
3344.7458
0.0767954
0.283
3
3592.7119
0.0824887
0.284
3.51
300001
0.68881
2.93

J.W. Huggins P.E. Engineering, Inc.
PO BX 11351
SOOI O'Quinn Blvd. [fait F Southport NC 2846E
��
PH:910-278-1226 Fax:[phone]
iwhmmnanvCa�ec-n.crom
ADDRESS BUILDING SUPPLY AREA 01
Job Number: 01-06-180
Pre construction
Mark
IType of land use
C
Area sqft
Area ( acres)
CxA
land cover ( mean Now velocity)
length of overland flow (fi)
Area( acres)
V fpm
VxA
1
Business Neighborhood Area medium rate
0.35
76000
1.744719927
0.61065197
114% sloe Lawn
150
1.744719927
13.1
22.85583104
2
None
0
0
0
none
150
0
0
0
3
None
0
0
0
none
150
0
0
0
4
None
0
0
0
none
150
0
0
0
5
None
0
0
0
none
150
0
D
0
6
None
0
0
0
none
150
0
01
0
7
None
0
0
0
none
150
0
D
0
8
None
0
0
0
none
150
0
0
0
9
None
0
0
0
none
150
0
0
0
10
None
0
0
0
none
150
0
0
0
totals
76000 1.744719927 0.61065197
1.744719927
22.85583104
C
area weighted average
0.35
V
area weighted average
13.1 fpm
Tc
Time of Concentration
30.54 minutes
11
maximum intensity 1 year
2.53383075 inchesfhour
110
maximum intensity 10 year
I 4.79985825 incheslhour
allowable
q 1
1.54728875
100%1 1.5473 cfs
q 10
2.931 D42917
100% 2.9310 cfs

Post construction
Mark
Type of land use
C
Area ( sqft
Area acres
CxA
land cover ( mean flow velocity }
length of overland flow (ft)
Area(
acres)
V f m
VxA
1
Business Neighborhood Area medium rate
0.35
0
0
0
1/4% sloe Lawn
150
0
13.1
0
2
Roofs high rate
0.95
76000
1,744719927
1.65748393
none
150
0
0
0
3
Streets - Drives & walks low rate
0.75
0
0
1/4% sloe PavementtConcrete
150
0
19
0
4
None
0
0
0
none
150
0
0
0
5
None
0
0
0
none
150
0
0
0
6
None
0
0
0
none
150
0
0
a
7
None
0
0
0
none
150
0
0
0
8
None
0
0
0
none
150
0
0
0
9
None
0
0
0
none
150
0
D
0
10
None
0
0
0
none
150
0
0
0
totals
76000 1.744719927 1.65748393
0
0
unaccounted
0 0
C
area weighted average
0.95
V
area weighted average
#pIVl01 fpm
Tc
Time of Concentration
22.92 minutes
time for 1.0"
10146 Bypass Volume
li
maximum intensity 1 year
2.5767885 inchesihour
11.8 hr
6333 cult of water @ 1.0"
i10
maximum intensity 10 year 4.8812335 inchesfhour
8.6 hr
23433 cult of water tat 1 yr
44333 tuft of water for 10 yr
q 1
4.27098553 flow to be controlled 2.7237 cfs
q 10
1
8,090566086 Iflow to be controlled 5.1595 cfs
Lot Size
76000 sgft
3o% of lot
22800 sqft
total impervious
76000 sqft
overage
53200 sqft
percent impervious
100.00%

Project : 01-06-0180 Simulation Run : 10 year event Reservoir: Drainage area 1
Start of Run : 01Jan2006, 12:00 Basin Model: Basin 1
End of Run: 04Jan2006, 12:00 Meteorologic Model : SCS II 10Y
Execution Time: 25Ju12006, 11:20:34 Control Specifications : Control 1
Volume Units: AC -FT
)mputed Results
Peak Inflow: 9.36 (CFS) Date/Time of Peak Inflow: 02Jan2006, 00.12
Peak Outflow: 1.86 (CFS) Date/Time of Peak Outflow : 02Jan2006, 00.54
Total Inflow: 1.10 (AC -FT) Peak Storage : 0.42 (AC -FT)
Total Outflow: 1.10 (AC -FT) Peak Elevation : 3.28 (FT)

0.45
0.40
0.35
0.30
Q 0.25
m
0.20
U- 0.15
0.10
0.05
0.00
F
1L
U
3
a
E
Reservoir Element "Drainage areal" Results for Run "10 year event"
11
i
1
r,
r I
3.50
3.11
2.72
2.33
1.94
1.56
w
1.17
0.78
0.39
0.00
1210 00:00 12:00 00:00 12:00 00:00 12:00
01Jan2008 I 02Jan2006 I 03Jan2006 f 04Jan20D6
...... RuMOYEAR EVENT EleirWRNNAGE AREA 1 RnkStM — — MIDYEAR EVENT &mADRAWAGE AREA 1 ResAPod Eledon
— Run:14 YEAR EVENT Elem r ORAINAGE AREA 1 ResultOdo# --- Rol YEAR EVENT EleawdRNNAGE AREA 1 ResuKombined In

® J.W. Huggins P.E. Engineering, Inc.
PO BX 11351
5001 O'Quinn Blvd. Unit F Southport NC 2$461
PH:910-278-1226 Fax:[phone]
iw h oo m o a n y P ec. rr. co m
ADDRESS BUILDING SUPPLY AREA 02
Job Number: 01-06-180
Pre construction
Mark
Type of land use
C
Area (s ft)
Area ( acres)
CxA
land cover ( mean flow velocity)
length of overland flow (ft)
Area( acres)
V f m
VxA
1
Business Neighborhood Area medium rate
0.35
24000
0.550964187
0.19283747
114% slope Lawn
150
0.550964187
13.1
7.217630854
2
None
0
0
0
none
150
0
4
6
3
None
0
0
0
none
150
0
0
0
4
None
0
0
0
none
150
0
0
0
5
None
0
0
0
none
150
0
0
0
6
None
0
0
0
none
150
0
0
0
7
None
01
1 01
0
1 none
1 1501
01
0
0
8
None
0
0
0
none
1 150
0
0
0
9
None
0
0
0
none
150
0
0
0
10
None
0
0
0
none
150
0
0
0
totals 24000 0.550964187 0.19283747
0.550964187
7.217630854
C
area weighted average
1 0.35
V
area weighted average
13.1 fpm
Tc
Time of Concentration
17.58 minutes
11
maximum intensity 1 year
2.60689275 inches/hour
110
maximum intensity 10 year
4.93826025 incheslhour
allowable
q 1
0.502706591 100% 0.5027 cfs
q 10
1 0.952281591 100% D.9523 cfs

Post construction
Mark
Type of land use
C
Area { sgft J
Area (acres)
CxA
land Dover mean Flow velocity)
length of overland Flow (ft)I
Area( acres)
V f m
VxA
1
Business Neighborhood Area medium rate
0.35
9949
0.228397612
0.o7993916
114% slope Lawn
150
0.228397612
13.1
2.992C08724
2
Roofs high rate
0.95
14051
0.322566575
0.30643825
none
150
0
0
0
3
Streets - Drives & walks low rate
0.75
0
0
114% slope Pavement/Concrete
150
0
19
0
4
None
0
0
0
none
150
0
0
D
5
None
0
0
0
none
150
0
0
0
6
None
0
0
0
none
150
0
0
0
7
None
0
0
0
none
150
0
0
0
8
None
0
0
0
none
150
0
0
0
9
None
0
0
0
none
150
0
0
0
10
None
0
0
0
none
150
0
0
0
totals 24000
0.550964107 0.38637741
0.228397612
2.992008724
unaccounted 0
0
C
area weighted average
F 0.701275
V
area weighted average
13.1 fpm
Tc
Time of Concentration
1 13.141 tes
time for 1.0"
1926 Bypass Volume
11
maximum intensity 1 year
2.63192325 inches/hour
1 i .8 hr
2000 cuft of water @ 1.0"
110
maximum intensity 14 year 4.98567575 incheslhour
8.6 hr
4332 tuft of water fot 1 yr
q 1
1.01691559 flow to be controlled 0.5142 cfs
8196 cuft of water for 10 yr
q 10
1.926352486 flow to be controlled
1 0.9741 1cfs
Lot Size
24000 sgft
30% of lot
7200 sgft
total impervious
14051 sgft
overage
6851 sgft
percent impervious
58.55°h

Project. 01-06-0180 Simulation Run : 10 year event Reservoir: Drainage Area 2
Start of Run : 01 Jan2006, 12.00
End of Run: 04Jan2006, 12:00
Execution Time: 25Ju12006, 11.20:34
Volume Units
puted Results
Basin Model : Basin 1
Meteorologic Model: SCS II 10Y
Control Specifications : Control 1
AC -FT
Peak Inflow: 2.96 (CFS) Date/Time of Peak Inflow: 02Jan2006, 00:12
Peak Outflow: 0.66 (CFS) Date/Time of Peak Outflow: 02Jan2006, 00:48
Total Inflow: 0.35 (AC -FT) Peak Storage : 0.11 (AC -FT)
Total Outflow: 0.35 (AC -FT) Peak Elevation : 3.02 (FT)

0.12
0.10
w 0,08
U
Q
0.06
N
0.04
0.02
-0.00
3.0
2,'
2.1
LL U
U
3
0
w
0.11
Reservoir Element "Drainage Area T Results far Run 10 year event"
1;
n
,
I_I
i
�I
0.o-t"----
12:00
0142006
3.50
2.92
2.33
F
W
1.75
m
W
1.17
0.58
0.00
00:00 12:00 00:00 12:00 DOM 12:00
02Jan2OO6 I 03Jan2006 I 04Jan20G6
...... Run;10 yeas event ElementDRAINAGE AREA 2 Resuri SV* — — Run 10 year event Elemert.DRAINAGE AREA 2 Resull:Pod Eevation
— Run.10 year event ElementDRAINAGE AREA 2 Result0 dox --- Run 10 year even Elemerk:DRA1NAGE AREA 2 Rff&Cor dined hlor

StormTech Warranty
Page 1 of 2
MARKETS WE SERVE
CUSTOMER SERVICE
• j StormTech Cost Comparison
Phone, Fax or E-mail
us with product
questions or PLEASE NOTE: This site calculator utilizes a 40% porosity within the stone.
comments about our
website. Site Calculator
Get ADS
Sales/Pricing
Information
LANGUAGEIIOIOMA�y
Cambie al espanol
See related
StormTech
Chambers
Technical Data
+, View Technical Data
by Market
0,51 View Technical Data
by Data Type
® View Technical Data
by Product Type
Technical questions?
�d See our
Prod uct[Technical
FAQs
Enter the Required Storage Volume and select a StormMaster system and the
calculator will approximate the total system size and cost needed.
Required Storage Volume:
StormTech Systems:
StormTech Volume per Chamber:
Number of Chambers Needed
Required Bed Size:
Quantity of Stone: *
Volume of Excavation:
Area of filter fabric: *
3512 1 ft3 Calculate
SC _ 740 Reset
81.6 CF w/12" of stone below
44
1635,92
159.72
304.92
199.95
I
ft2
Yds3 222.64
Yds3
Yds2
Quantity
Cost'
Chambers: i44
$' 185
/ unit**
Stone: 222.64
$ 12.00
/ ton
Excavation: 304.92
$' 5.00
/ yard
Filter Fabric: � 199.95
$; 0.50
/ yard
'Call 1-888-296-5367 for estimated chamber pricing.
* includes 10% overage for bed perimeter
Total
$ 8,140.00
$ 2,671.68
$ 1, 524.60
$ 99.98
Subtotal $ 12.434.00
Cost per ft3 $ 3.54
,Tons
For general estimate purposes only. Contact Stormtech for costs on specific
projects and associated variables. Does not reflect changes in geographical costs
or contractors overhead, profit and other miscellaneous expenses.
'Chamber costs may not be inclusive of shipping.
http://www.ads-pipe.com/us/en/technical/siteealc.shtm1 7/24/2006

StormTech Warranty Page 1 of 2
UARKFTC WF AFRI/P
CUSTOMER SERVICE
July 24, 20
. 9 StormTech Cost Comparisons snarl
Phone, Fax or E-mail
us with product
questions or PLEASE NOTE: This site calculator utilizes a 40% porosity within the stone.
comments about our - o�
website. Site Calculator
Pt
Enter the Required Storage Volume and select a StormMaster system and the
Get ADS
calculator will approximate the total system size and cost needed.
How
Sales/Pricing
PipeMe
Information
Required Storage Volume:
19000
ft3 Calculate
N-12 Pi
LANGUAGE r.IDIOM A_ _ �;
StormTech Systems:
SC - 740
Reset
Cambie al espaRol
StormTech Volume per Chamber:
81.6 CF w112" of stone below
A Te:
"Installatio
two weeks
Number of Chambers Needed:
233
would only
60 feet a c
See related
Required Bed Size: *
8662.94
ft2
we were a
StormTech
than
moreQuantity
Chambers
of Stone: `
845.79
Yds3 1178.98 Tons
y�"
day."
Technical Data
Volume of Excavation: •
1614.69
Yds3
Mike Wilsc
+,
View Technical Data
Area of filter fabric:
1058.8
Yds2
Installatior
by Market
Westmar,
From the c
Quantity
Cost'
Total
View Technical Data
by Data Type
Chambers: 233
$185
1 unit*" $ 43,105.00
Stone: 1178.98
$;12.00
1 tan $ 14,147.76
zB
View Technical Data
by Product Type
Excavation: 1614.69
$ 5.00
yard $ 8,073,45
`'-;
Technical questions?
Filter Fabric: 1058.8
$ 0.50
1 yard $ 529.40
See our
'Call 1-888-296-5367 for estimated chamber pricing.
Prod uctfTechn ical
FAQs
Subtotal $ 65,854.00
Cost per ft3 $ 3.47
" includes 10% overage for bed perimeter
For general estimate purposes only. Contact Stormtech for costs on specific
projects and associated variables. Does not reflect changes in geographical costs
or contractors overhead, profit and other miscellaneous expenses.
*'"Chamber costs may not be inclusive of shipping.
http://www.ads-pipe.com/us/enitechnical/siteeale.shtm1 7/24/2006