SW8060742_HISTORICAL FILE_20061024

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

State Stormwater Management Systems
Permit No. SW8 060742
STATE OF NORTH CAROLINA
DEPARTMENT OF ENVIRONMENT AND NATURAL RESOURCES
DIVISION OF WATER QUALITY
STATE STORMWATER MANAGEMENT PERMIT
HIGH DENSITY DEVELOPMENT
In accordance with the provisions of Article 21 of Chapter 143, General Statutes of North
Carolina as amended, and other applicable Laws, Rules, and Regulations
PERMISSION IS HEREBY GRANTED TO
Brian K. Keesee & Brian Keith Keesee Construction, Inc.
Oak Island Building Supply
4255 Long Beach Road, Southport, Brunswick County
FOR THE
construction, operation and maintenance of two underground infiltration trench systems in
compliance with the provisions of 15A NCAC 2H .1000 (hereafter referred to as the
"stormwater rules') and the approved stormwater management plans and specifications and
other supporting data as attached and on file with and approved by the Division of Water
Quality and considered a part of this permit.
This permit shall be effective from the date of issuance until October 24, 2016, and shall be
subject to the following specified conditions and limitations:
I. DESIGN STANDARDS
1. This permit is effective only with respect to the nature and volume of stormwater
described in the application and other supporting data.
2. This stormwater system has been approved for the management of stormwater
runoff as described in Section 1.7 on page 3 of this permit. The stormwater controls
fc r Drainage Areas 01 and 02 have been designed to handle the runoff from 76,000
ft and 14,051 ft of impervious area, respectively.
3. The design storm for each system is 3 inches therefore a vegetated filter is not
required. Runoff in excess of the design storm is intended to bypass through the top
of the catch basins and flood the parking areas until it can infiltrate.
4. The tract will be limited to the amount of built -upon area indicated on page 3 of this
permit, and per approved plans.
5. All stormwater collection and treatment systems must be located in either dedicated
common areas or recorded easements. The final plats for the project will be recorded
showing all such required easements, in accordance with the approved plans.
6. The runoff from all built -upon area within the permitted drainage area of this project
must be directed into the permitted stormwater control system.
Page 2 of 7

State Stormwater Management Systems
Permit No. SW8 060742
rI
The following design criteria have been provided in the infiltration trench and must be
maintained at design condition:
a
b.
C.
d.
e.
f.
h.
i.
1.
k.
i.
m
n.
o.
Drainage Area, acres:
Onsite, ft
Offsite, ft2:
Total Impervious Surfaces, ft2:
Design Storm, inches:
Trench Dimensions, L x W x H, ft:
Perforated Pipe Diameter/Length:
Bottom Elevation, FMSL:
Bypass Weir Elevation, FMS.. :
Permitted Storage Volume, ft
Type of Soil:
Expected Infiltration Rate, inlhr:
Seasonal High Water Table, FMSL
Time to Draw Down, hours:
Receiving Stream/River Basin:
Stream Index Number:
Classification of Water Body:
II. SCHEDULE OF COMPLIANCE
DA 01 DA 02
1.74
0.55
76,000
24,000
0
0
76,000
14,051
3
3
334.5x25.25x4
156.5x11 x4
nla
nla
16.5
16.5
21.5
21.5
19,176
3,590
Med, to Fine Sand (both)
14.8
14.8
14.5
14.5
12
5
Calf Gully Creek / Cape Fear
CPF17 18-88-9-3-3-1
"SC Sw HQW"
The stormwater management system shall be constructed in its entirety, vegetated
and operational for its intended. use prior to the construction of any built -upon
surface.
2. During construction, erosion shall be kept to a minimum and any eroded areas of the
system will be repaired immediately.
3. The permittee shall at all times provide the operation and maintenance necessary to
assure the permitted stormwater system functions at optimum efficiency. The
approved Operation and Maintenance Plan must be followed in .its entirety and
maintenance must occur at the scheduled intervals including, but not limited to:
a. Semiannual scheduled inspections (every 6 months).
b. Sediment removal.
C. Mowing and revegetation of slopes and the vegetated filter.
d. Immediate repair of eroded areas.
e. Maintenance of all slopes in accordance with approved plans and
specifications.
f. Debris removal and unclogging of bypass structure, filter media, flow
spreader, catch basins, piping and vegetated filter.
g. A clear access path to the bypass structures must be available at all times.
4. Records of maintenance activities must be kept and made available upon request to
authorized personnel of DWQ. The records will indicate the date, activity, name of
person performing the work and what actions were taken.
5. The facilities shall be constructed as shown on the approved plans. This permit shall
become voidable unless the facilities are constructed in accordance with the
conditions of this permit, the approved plans and specifications, and other supporting
data.
6. If the stormwater system was used as an Erosion Control device, it must be restored
to design condition prior to operation as a stormwater treatment device, and prior to
occupancy of the facility.
Page 3 of 7

State Stormwater Management Systems
Permit No. SW8 060742
7. Upon completion of construction, prior to issuance of a Certificate of Occupancy, and
prior to operation of this permitted facility, a certification must be received from an
appropriate designer for the system installed certifying that the permitted facility has
been installed in accordance with this permit, the approved plans and specifications,
and other supporting documentation. Any deviations from the approved plans and
specifications must be noted on the Certification. A modification may be required for
those deviations.
8. Access to the stormwater facilities shall be maintained via appropriate easements at
all times.
9. The permittee shall submit to the Director and shall have received approval for
revised plans, specifications, and calculations prior to construction, for any
modification to the approved plans, including, but not limited to, those listed below..
a. Any revision to any item shown on the approved plans, including the
stormwater management measures, built -upon area, details, etc.
b. Project name change.
C. Transfer of ownership.
d. Redesign or addition to the approved amount of built -upon area or to the
drainage area.
e. Further subdivision, acquisition, lease or sale of all or part of the project area.
The project area is defined as all property owned by the permittee, for which
Sedimentation and Erosion Control Plan approval or a CAMA Major permit
was sought.
f. Filling in, altering, or piping of any vegetative conveyance shown on the
approved plan.
10. The permittee shall submit final site layout and grading plans for any permitted future
areas shown on the approved plans, prior to construction.
11. A copy of the approved plans and specifications shall be maintained on file by the
Permittee for a minimum of ten years from the date of the completion of construction.
12. The Director may notify the permittee when the permitted site does not meet one or
more of the minimum requirements of the permit. Within the time frame specified in
the notice, the permittee shall submit a written time schedule to the Director for
modifying the site to meet minimum requirements. The permittee shall provide copies
of revised plans and certification in writing to the Director that the changes have been
made.
III. GENERAL CONDITIONS
This permit is not transferable except after notice to and approval by the Director. In
the event of a change of ownership, or a name change, the permittee must submit a
formal permit transfer request to the Division of Water Quality, accompanied by a
completed name/ownership change form, documentation from the parties involved,
and other supporting materials as may be appropriate. The approval of this request
will be considered on its merits and may or may not be approved. The permittee is
responsible for compliance with all permit conditions until such time as the Division
approves the transfer request.
2. Failure to abide by the conditions and limitations contained in this permit may subject
.the Permittee to enforcement action by the Division of Water Quality, in accordance
with North Carolina General Statute 143-215.6A to 143-215.6C.
3. The issuance of this permit does not preclude the Permittee from complying with any
and all statutes, rules, regulations, or ordinances, which may be imposed by other
government agencies (local, state, and federal) having jurisdiction.
Page 4 of 7

State Stormwater Management Systems
Permit No. SW8 060742
4. In the event that the facilities fail to perform satisfactorily, including the creation of
nuisance conditions, the Permittee shall take immediate corrective action, including
those as may be required by this Division, such as the construction of additional or
replacement stormwater management systems.
5. The permittee grants DENR Staff permission to enter the property during normal
business hours for the purpose of inspecting all components of the permitted
stormwater management facility.
6. The permit may be modified, revoked and reissued or terminated for cause. The
filing -of a request for a permit modification, revocation and reissuance or termination
does not stay any permit condition.
7. Unless specified elsewhere, permanent seeding requirements for the stormwater
control must follow the guidelines established in the North Carolina Erosion and
Sediment Control Planning and Design Manual.
8. Approved plans and specifications for this project are, incorporated by reference and
are enforceable parts of the permit.
9. The permittee shall notify the Division any name, ownership or mailing address
changes within 30 days.
Permit issued this- a 24th day of October 2006.
NO CAROLINA V NMENTAL MANAGEMENT COMMISSION
.ror Alan W.Klimek, P.E., Director
Division of Water Quality
By Authority of the Environmental Management Commission
Page 5 of 7

It
r
1W 1E71-LJGC;-11*N4S-
I-1-glXle-cril-Ig <'&-- surveying; Inc.
P.O. Box 11351, Southport, NC 28461
PH: 910-278-1226 Fax: [phone]
September 19, 2006
Linda Lewis
NC DENR
Division of Water Quality
127 Cardinal Drive Ext.
Wilmington, NC 28405
RE: Oak Island Building Supply
Stormwater Project No. SW8 060742
Dear Ms Lewis,
We are responding to your comment letter dated September 7, 2006 as follows:
Issues are addressed as they were on your comment letter which is attached.
1) Pages 1 & 4 of the Stormwater Management Permit Application Form have updated
corporate information.
2) An additional detail on page 01.1 without the Stormtech system obstruction is
provided.
3) The roof drain "rock boxes" have been eliminated on pages 01.0 and 01.1.
4) Page 4 of the Stormwater Management Permit Application Form has been updated.
5) Text referring to stone above Stormtech system has been changed so as to not infer
that it is counted as storage volume.
6) Page 4 of the Infiltration Trench Supplement and page 4 of the Stormwater
Management Permit Application Form have been provided with original signatures.
7) NC 133 south of NC 211 has been labeled on the vicinity map on page 01.0
SEP 2 0 206

r
JW HILTGGINS
rip-irneerinp-r 8r- Surveviri—o- Inc.
P.O. Box 11351, Southport, NC 28461
PH: 910-278-1226 Fax: [phone]
We are providing two (2) copies of revised sheet 01.0 and sheet 01.1 along with (2)
copies of pages I & 4 of the Stormwater Management Permit Application Form.
Additionally we are providing (4) copies of page 4 of the Infiltration Trench Supplement
with the (2) sets of pages 1-3 for the Infiltration Trench Supplement you sent us for your
continued review and approval. Please contact us if you have any further questions or
comments. Thank you for your assistance on this project.
Sincerely,
J W Huggins
Engineering & Surveying Inc.
J W Huggins, P.E.

,i -
J W Huggins Engineering Inc.
P.O. Box 11351, Southport, NC 28461
Stormwater Narrative
Monday, August 7. 2006
Narrative for the development of a building supply at 4255 Long Beach Rd. in Southport,
NC.
Drainage Area 1
The stormwater from the site will be collected by sloping the lot from the property lines
to the center at a minimum of 1/2%. At the center of the lot there is a StormTech SC-740
Chamber System. This System is tied together by 3' x 3' x 6' deep drop inlets with 12"
and 2' diameter pipes. The stormwater will be collected for storage and infiltration in the
StormTech SC-740 chambers. Each chamber has 81.6 cubic feet of stormwater storage.
The system consists of 235 chambers for a total of 19,176 cubic feet of storage. This will
contain all of the stormwater from the site. This design allows for all of drainage area 1
to be impervious. Additionally, this design is for a 1.57, 24-hour design event to be
contained and furthermore, 3" of storage is obtained so the "no overflow" requirements
are met.
Drainage Area 2
The stormwater from the roof surface will be collected into the gutter system and piped to
3' x 3' x 3' #57 rock boxes for storage and infiltration; these rock boxes are then piped
with 8" pipe to the second StormTech SC-740 system. The impervious surfaces outside
of the roof areas will have a 1 % slope to the edges of the surface. At the edge of the lot
there is a StormTech SC-740 Chamber System. This System is tied together by 3' x 3' x
6' deep drop. inlets with 12" pipes. The stormwater will be collected for storage and
infiltration in the StormTech SC-740 chambers. Each chamber has 81.6 cubic feet of
stormwater storage. This system consists of 44 chambers for a total of 3590 cubic feet of
storage. This design allows for 6,000 square feet of building and 8200 square feet of
impervious surfaces. All of the stormwater will be contained on the site in the storage
and infiltration system. Additionally, this design is for a 1.5", 24-hour design event to be
contained and furthermore 3", of storage is obtained so the "no overflow" requirements
are met.

J W Huggins Engineering Inc.
P.O. Box 11351, Southport, NC 28461
Stormwater Narrative
Monday, August 7, 2006
Pre Construction conditions were determined using TR-55 calculations.
The Project is divided into 2 Drainage areas as follows:
Draingge Area 1:
Bann Area
76000 sgft
1.744 Acre
Imperious Area
76000 sgit
1.744 Acres
Impervious Percent
100%
Drainage Area 2:
Basin Area
24000 sgft
0.551 Acre
Impervious Area
8051 soft
0.185 Acres
Impervious Percent
58.59/o
See Attached Tc and
CN calculation sheet for Total TC, Storage Coefficient, and
Weighted CN.
See Attached spreadsheets for Pre -Construction Intensities and Flow rates

Page 1 of' 1
North Carolina
Elaine F Marshall i EPARTMENT OF'THE
Secretary . SECRETARY OF STATE
Corporations
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°Corporations Division
"Secretary of State's web site
Print
*Printable Page
PO Box 29622 Raleigh, NG 27626-0622 (919}807-2000
Date: 9/7/2006
Click here to:
View Document Filings I
Print apre-populated Annual Report Form i Annual Report Count I Fil
an Annual Report I
Corporation Names
Name Name Type
NC Brian Keith Keesee Legal
Construction Inc
Business Corporation Information
SOSID:
Status:
Date Formed:
Citizenship:
State of Inc.:
Duration:
Registered Agent
Agent Name:
Registered Office Address
Registered Mailing
Address:
Principal Office Address:
Principal Mailing Address
0615806
Current -Active
1/10/2002
Domestic
NC
Perpetual
Keesee, Brian Keith
226 Northeast 63rd Street
Oak Island NC 28465
226 Northeast 63rd Street
Oak Island NC 28465
226 Northeast 63rd Street
Oak island NC 28465
226 Northeast 63rd Street
Oak Island NC 28465
Stock
Class Shares No Par Value Par Value
Common 10000 Yes NIA
For questions or comments about the North Carolina Secretary of State's web site, please send e-mail to Webmaster,
http:l/www.secretary.state.nc.us/Corporations/Corp.aspx?Pltemld=5409128 9/7/2006

SOS ID: 0615806
Date Filed: 4/18/2005 12:15:01) PM
Elaine F. Marshall
North Carolina Secretary of State
i 479 Business Corporation Use this form only it 2005108 09041
-t North Carolina Annual Report AnnualContactRaport forme
Liability Partnerships, and Lirnited Liability Companies.
Name of Corporation: BRIAN KEITH KEESEE CONSTRUCTION INC
State of Incorporation: NC Fiscal Year Ending: 12 31 04
Mon1h / Day / Year
Secretary of State Corp. ID Number: 0 615 8 0 6 Federal Employer la Number: 010585968
H this is the Initial annual report filing, you must complete the entire form. If your business corporation's
information has not changed since the previous report, check the box and complete Llne 7 only.
I. Registered agent & registered office street address: (Must be a North Carolina Address)
Name;
Street Address:
My. Stets. Zip Code: County:
2. Mailing address if different from street address:
Mailing Address:
City, State, Zlp Code..
3. N registered agent changed, signature of new agent:
(signature constitutes consent to the appointment)
4. Enter principal office address and tetephone number here:
Street Addre=
Chy, State, Zip Code: Telephone:
5. Brieftr describe the nature of business:
6. Enter name, title, and business address of principal officers here:
Complete Form CD-479A to list additional principal officers
Name: Title,
Address:
City: State: Zip:
Name: Titta:
Address:
C' : State: Zip:
Name:
Address:
Title:
7. C Of report
/ ? v ,
State:
completed by all corporations).
S1911ture {Form imut 59 signed by an officer or corporation)
�4A�' Yee Sce
Type or Print name
its
— Title

TO : 84591-- "
SOSID: 615806
22 007 5 17 i Date Filed: 1/10/2002 4:00 PM
State of North Carolina Elaine F. Marshall
Department of the Secretary of State North Carolina Secretary of State
ARTICLES OF INCORPORATION
Pursuant to §55-2-02 of the General Statutes of North Carolina, the undersigned does hereby suhmit these Articles of
Incorporation for the purpose of forming a business corporation.
1. The name of the corporation
2. The number of shares the corporation is authorized to issue is:
Theseesshares shall be: (check either a orb)
a, A! all of one class, designated as common stock; or
b—divided into classes or series within a class as provided in the attached schedule,
with the information required by N.C.G.S. Section 55-6-01.
3. The street address and county of the initial registered office of the corporation is:
Number and Street
City, State, Zip Code d T S L )I.%J L> ry C 2- k q t.5 - -County 111JS�+1 ]rCK
4. The mailing address if different from the street address of the initial registered office is:
5. The name of the initial registered agent is: i )Srl9�
6. Any other provisions, which the corporation elects to include, are attached.
7. The name and address of each incorporator is as follows:
22t� ;40leTNl5*SY- 'G39n Sr
rS kYlA t A G ?-N Lr
8. These articles will be effective upon filing, unless a date and/or time is specified:
This the —L-5rday of LrA4 tA At-1 20-0-1,--
AND
NOW ON
l` Eden)f^mot
Type or Print Name and Title
NOTES:
1. Filing fee is S125. This document and one exact or conformed copy of these articles must be filed with the Secretary of State.
(Revised January 2000) (Form 8-01)
CORPORATIONS DIVISION P. 0, BOX 29622 RALEIGH, NC 27626-0622

15
SOS] D: 0615806
Date Filed: 7/21/2003 10:25:00 AM
Elaine F. Marshall
North Carolina Secretary of State
2003 146 00067
CD-479 (45) Business Corporation Use this form only V y
7•e1 North Carolina Annual Report Contact the N.C. Secr 2 9
s
Annual Report form fail
Liability Partnerships, and Limited Liability Companies.
Name of Corporation, BRIAN KEITH KEESEE CONSTRUCTION INC
Slate of Incorporation. NC
Secretary of State Corp. 10 Number: 0 615 8 06'
Fiscal Year Ending:
Federal Employer ID Number: 010585968
If this Is the Initial annual report tiling, you must complete the entire form if your business corporation's
information has not changed since the previous report, check the box and complete Line B only.
1. Registered agent & registered office mailing address Agora: BRIAN KEIT1•I KEESEE
Mailing Address: 226 NORTHEST 63RD ST
OAK ISLAND NC 28465
2. Street address & county of registered office Street Address: 226 NORTHEAST 63RD ST
County: BRUNSWICK
3. If registered agent changed, signature of now agent:
{antra comtltutes cement to lh• appointment)
4. Enter principal office address here: 226 NORTHEAST 63RD ST
OAK ISLAND NC' 28465
5. Enter principai office telephone number here: i�,� •�n'Cj, D�� Q
fi. Enter name, title, and business address of principal oir"m here;
Complete Form CD-479A to list additional principal officers
�iAV'o -
Mon Day/Yaar
--* 0
Name: BRIAN KEITH KEESEE Title: PRESIDENT
Address: 226 NORTHEAST 63RD ST
City:. OAK I S LAND state: NC _ zip: 28465
Name: rule:
Address:
Cam: State: Zip:
Name: Title:
Address:
City; State: Zip:
7. Briefly descrihe the nature of business:
0 RU ION OF ESIDENTIAL HOUSES
B icatio 41 po ust be completed by all corporations
4Aki�
lq turn ( orm t be argnad by an of flwr or rarpuauan) Date
BRIAN KEITH KEESEE PRESIDENT
_�� � e!'Pa llilf#Ifll ill 111111111 Jill 111 1111111111111111111111

Michael F. Easley, GUVemOr
�o�oF w A r�9QG
July 31, 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:
William G. Ross Jr., Secretary
North Carolina Department of Fnvironment and Natural Resources
Alan W. Klimek, P.E. Director
Division of Water Quality
The Wilmington Regional Office received a Stormwater Management Permit Application for
Oak Island Building Supply on July 27, 2006, with a scheduled Express Review date of July
27, 2006. The check for the application fee was only written for $2,000, whereas the project is
high density, and requires a $4,000 fee. Check #1800 for $4,150.00 was received on July 31,
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:
tI%1. Please provide proposed grading in the form of actual finished grade spot
elevations and contours. Flow arrows depicted the direction of drainage are not
sufficient.
2. Please report your title within the corporation in Section 1.2 of the application.
Only a person of at least the level of vice president in the corporation may sign
the application and supplements.
3. Please have .the consultant redraw the plans to an acceptable engineering scale.
The current scale of 1132" = 1' is not acceptable. The smallest scale on my
architect's scale is 3132" = 1'.
,f 4. The dimensions shown on the plans for Trench #1 do not appear to be correct.
Please check and revise as necessary. Based on the provided Stormtech plan
and section details, a minimum trench length of 236 feet and a minimum trench
width of 48' is required to accommodate the 233 proposed Stormtech units for
Trench #1 in the proposed configuration. Based on the dimensions shown on the
plans of 73'-10" and 97'-6", only a total of 171 feet of trench is provided. The
width of Trench #1 is not specified on the plans.
✓5. Please provide accurate dimensions for the building, parking, sidewalk and
storage areas.
i/ 6. The Stormtech plan details are not matching up very well with the proposed
configuration of the trenches.
7. Please add the number of Stormtech units being proposed for each Trench, and
the individual volume for a single Stormtech SC-740 unit (45.9 cubic feet, One
without stone?) Np�(tthtCarolina
Na&ra!!y
North Carolina Division of Water Quality 127 Cardinal Drive Extension Wilmington, NC 28405 Phone [phone] Customer Scrvice
Wilmington Regional Office Internet: www,ncwaterquality.org Fax [phone]
An Equal OpportunitylAffirmative Action Employer — 50% Regcledll0% Post Consumer Paper

Mr. Keesee
July 31, 2006
Stormwater Application No. SW8 060742
8. The supplement forms are geared toward the more traditional gravel
trench with perforated piping however, they can be adapted for the
Stormtech system. Please report the trench length and width on each
supplement. The consultant has indicated that this varies, but I disagree.
Based on the proposed configuration, a finite trench length and width can
be established.
9. The specifications for Stormtech indicate that the 81.6 cubic feet of
volume per unit for the SC-740 includes 12" of stone. Does this value
include the 6" of stone above the unit as well?
10. Please sign, seal and date the calculations.
11. Please delineate the individual post -development drainage area for each
of the two proposed trenches.
12. Please provide a vicinity map on the plans and show the nearest
intersection of two major roads. A major road is any 1, 2 or 3 digit NC, US
or interstate highway. Ideally, the vicinity map should be geared toward
driving to the site from Wilmington.
13. Due to the insufficiency of this application, the Division is requiring a
$1,000 resubmittal fee.
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 August 11,
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 Division is allowed 90 days from the receipt of a completed application
to issue the permit.
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.ju106
cc: J.W. Huggins, P.E.
Linda Lewis
Page 2 of 2

ADS Products - Bio-Diffuser Leaching Chambers
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1 SC-740TM chambers
;.r
The StormTech SC-740T1' Chamber
optimizes storage volumes in
relatively small footprints. By
providing 2.2 ft3/ft2 (minimum) of
storage, the SC-740TM chambers
can prevent excessive excavation,
backfill and associated costs.
' StormTech chambers have been
subjected to advanced in -ground testing protocols and high-level
industry expert review. They have been evaluated to support HS-
20 live loads following current AASHTO procedures for loads,
structural capacity and factor of safety when installed per
StormTech's Chamber Installation Instructions.
StormTech chambers are molded from Polypropylene resin, which
is inherently resistant to environmental stress cracking and
chemicals typically found in stormwater runoff. .
Click here to view the technical drawing with the
specifications of the SC-740TM Chamber.
Nominal Chamber Specifications
Chamber Size (W x H x
Installed I-)
51.0" x 30.0" x
85.4"
Chamber Storage
45.9 ft3
Chamber Wei ht
74.0 Ibs
Minimum Installed Storage
74.9 ft3
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4255 Long Beach Rd SE
Southport, NC 28461-8626
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1. �
1
Brian Keesee Construction
Building Supply Stormwater
Storm'Tech Design Data
Prepared by:
.IW Huggins P.E. Engineering Inc.
PO Box 11351
Southport NC 28461
910-278-1226

I a McmMaRW OMMOO
I
Table 5 and Table 6 provide incremental storage volumes
for SC-310 and SC-740 chamber systems. This infor-
mation may be used to calculate a detentionlretention
system's stage storage volume.
Product Specifications: 1. 1, 2.2, 2.3, 2.4 and 2.6
TABLE 5 - SC•310 Incremetrtal Storage Volumes Per Chamber
Assumes 40% Stone Porosity. Calculations are Based
Upon a 6-inch Stone Base Under the Chambers.
BD kEftaU (W)
RINU Ord
MwCap
28_
31.00
27
_14.70 _
14.70 -
30.21
26
Slone 14.70
29.42
-_ 28.63
�- 25
Cover 14.70 �
24
_ 14.70 _
27.84
- 23
Y 14.70
27.05 _
22 r_^_
_ 14.70 �- 26.26
21 14.64 _
25.43�_
20
14.49 _
_ 24.54
19
14.22
23.58
18 - _ -R
- -13-68 _
22.47 -,
.17 _
12.99
2125_ _
16
12-17
19.97 j
15
11.25
18.62_
10 23 _i_
.�..... 17.22 _
T 13
9.15
15.78
12
7.99
14.29
11
6-78
_ 12-77
10
--
5.51
11.22
9
4.19
_ 9.64
r-- 8 _
*
2.83 �y�-.-_--
8.0_3
7
1.43
6.40T--J
6
0
4.74
3.95
5
0
4
Stone_0
- 3.16 _
3
Foundation 0
0 _
2.37
2
1.58
1
0
0.79
Note. Add 0.79 cu. fc of storage for each additional inch of
stone foundation.
TABLE 6 - SC-740 Incremental Storage Volumes Per Chamber
Assumes 40% Stone Porosity. Calculations are Based
Upon a 6-inch Stone Base Under the Chambers.
O0 tf o a er Cumu ailve lal Sysle n
n yste n Chamee Cumulal e
Stange it Slo age 11
42
45.90
74.90 _
41
~.
45.90
73.77 _
40�
--
Stone 45.90
72.64
39
Cover 45.90
71.52
38
G_ 45.90 _
70.39
T _ 36
35
45.90
68.14 _
66.98_
T 34�
_45.85
45.69
65.75 i
45.41
f 64.46
_33
T 32_
31
44.81
44.01
62.97
61.36
30
43.0_
6 59.66
r _ _ 29 _
28
41.98
40.80
57.89
5605
27
26
39.54_
38.18
_ _ . 54.17
52.23
_
425
T 36.74
50.23
24 �r
23
- 35.22
33.64
48.19
46.11
22
31.99
44.00_�
21
30.29
1 41.85
19 -�
26.74
24.89
i
37.47__ _
35.23 I
_- 17 J
16
23.00
21.06
32.96
30.68
15
19.09
T28.36,��
14
17.08
26.03
_ 13
15.04
23.68
12
12.97
ii
-inns
1R49 !
10
_ 8.74
16.51
9
_
6.58
14.09
8
4.41
11.66
7 -
6
2.21
0
9.21 �
6.76
5.53 I
5- -
0
-�� 4
3
Stone 0
Foundation 0
0
4.51
3.38
2
1
2.25
0
1.13
_ _
Note: Add 1.13 cu. ft of storage for each additional inch of
stone foundation.
14 Call StormTech at 888.892.2694 or visit our website at www.storFntech.com for technical and product information.

L'
0-0 OUOUMt OMRt gu
For quick calculations, refer to the Materials Worksheet
on StormTech's website at www.stormtech.com.
10.1 SYSTEM SIZING
The following steps provide the calculations necessary to
size a system. The worksheet on page 17 itemizes these
calculations and costs. If you need assistance determin-
ing the number of chambers per row or customizing the
bed configuration to fit a specific site, call StormTech's
Technical Services Department at 14888-892-2694.
1) Determine the amount of storage volume (Vs)
required.
It is the design engineer's sole responsibility to deter-
mine the storage volume required by local codes.
TABLE 7 — Storage Volume Per Chamber
Bare �— Chamber and Stone 'Chamber, Stone Foundation Depth
Storage 1 6"- 12"-- 1r
SlormTech SC-740 45.9 74.9 81.7 88.4
SlormTech SC-310 14.7 31.0 35.7 T 40-4
Note: Storage volumes are in cubic feet per chamber. Assumes 40%
porosity for the stone plus the chamber volume.
2) Determine the number of chambers (C) required.
To calculate the number of chambers needed for
adequate storage, divide the storage volume (Vs)
by the volume of the selected chamber, as follows:
C = Vs / Volume per Chamber
3) Determine the required bed size (S).
To find the size of the bed, multiply the number
of chambers needed (C) by either:
StormTech SC-740 bed area per chamber = 33.8 it'
StormTech SC-310 bed area per chamber = 23.7 ft'
S = (C x bed area per chamber) + (1 foot x bed
perimeter in feet)
NOTE• It is necessary to add one foot around the perimeter of the
bed for end caps and working space.
4) Determine the amount of stone (Vst) required.
TABLE 8 - Amount of Stone Per Chamber in Tons
-- ---- -- Stone Foundation Depth
StormTech SC-740 3.8 (2.8 yd) 4.6 (3-3 yd') 5.5 (3.9 yd')
StormTech SC-310 2.1 (1.5 yd') 2.7 (1.9 yd') : 3.4 (2.4 yd')
Note: Assumes 6 inches of stone above, and between chambers.
To calculate the total amount of washed, crushed angu-
lar stone required, multiply the number of chambers (c)
by the selected tons of stone from Table B.
NOTE. Washed, crushed angular stone is also required around the
perimeter of the system.
5) Determine the volume of excavation (Ex) required.
6) Determine the area of filter fabric (F) required.
TABLE 9 — Volume of Excavation Per Chamber
Y -- - Stone Foundation Depth
StarmTech SC-740 5.5 6.2 6.8
StormTech SC-310 2.9 3.4 T3.8
Note: Volumes are in cubic yards per chamber. Assumes 6 ruches of
separation between chamber rows and 18 inches of cover. The vol-
ume of excavation will vary as the depth of the cover increases.
Each additional foot of cover will add a volume of excavation of
1.3 cu. yds. per SC-740 and 0.9 cu. yds. per SC-310 chamber.
The bottom and sides of the bed and the top of the
angular stone must be covered with a non -woven geot-
extile (filter fabric) that meets AASHTQ M288 Class 2
requirement. The area of the sidewalls must be calculat-
ed and a 2-foot overlap must be included where two
pieces of filter fabric are placed side -by -side or end -to -
end. Geotextiles typically come in 15 foot wide rolls.
7) Determine the number of end caps (Ec) required.
Each row of chambers requires two end caps.
Ec = number of rows x 2
16 Call StormTech at 888.892.2694 or visit our website at www.storrntech.com for technical and product information.

. .�L1111 [l llilal Vv [111 YI111Y
It,- . —
- - _ _ 1 1W
MARKETS WE SERVE
F, I StC,rI':"1 E:Ci i f:;S� "Dt1"1pai :>on
Phone, Fax or C-mail
us with product
CUSTOMIER SERVICE
questions or PLEASE NOTE. This site calculator utilizes a 40% porosity within the stone.
comments about our
website.
Get ADS
Sales/Pricing
Information
LANGUAGE / I0iO AA
Cambie al e-spanol
RFI�ATFE] INFC1RdA'if"10,; A`.1
W,. See related
-� StormTech
Chambers
Technical Data
View Technical Data
by Mafket
,." View Technical Data
by DatA.Type
View Technical Data
by ProdUcA Type
Technical questions?
See cur
Product/Technical
FAQs -
Site Calculator
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: 3512 ft3 Calculate
StormTech Systems: SC - 740 FTR —es et
StormTech Volume per Chamber: 81.6 CF w112" of stone below
Number of Chambers Needed:
44
Required Bed Size: "
1635 92
ftz
Quantity of Stone. *
159.72
Yds3
222.64
Volume of Excavation: '
304.92
Yds3
Area of filter fabric: `
199.95
Yds2
Quantity
Cost,
Total
Chambers: 44
$ 185
/ unit"`
$ 8,140.00
Stone. 222.64
$ 12.00
/ ton
$ 2,671.68
Excavation: 304.92
$ 5.00
/ yard
$ 1,524,60
Filter Fabric: 199.95
$ 0.50
/ yard
$ 99 98
,Call 1-888-296-5367 for estimated
chamber pricing
Subtotal 5 12,434.00
Cost per ft3 $ 3.54
. includes 10% overage for bed perimeter
Tons
For general estimate purposes only. Contact Stormtech for costs on specific
projects and associated variables. foes not reflect changes in geographical costs
or contractors overhead, profit and other miscellaneous expenses.
"Chamber costs may not be inclusive of shipping.
L,.._.11.,..,. "A' „;. " ,.,,/110/,,,,/IeWlinirraiI/ellrrralr c1111111 7/24/2006

1101 ILI
i t-%ii'=CIL Yauiy
- - — ' K
MARKETS WE SERVE
C (:) ,.'J. Cc I'.,...I !")I.-
r Phone,.F?x or E-mail
us with product
CUSTOMER SERVICE
questions or PLEASE NOTE. This site calculator utilizes a 40% porosity within the stone.
comments about our
website. Site Calculator
Enter the Required Storage Volume and select a StormMaster system and the
Get ADS calculator will approximate the total system size and cost needed.
Salesi Acing
Information
LANGUAGE I IDIOMA
Cambie al..espgool
See related
StormTech
Chambers
Technical Data
1 View Technical Data
by Market
View Technical Data
by Data Type
View Technical Data
by Froduct Type
Technical questions?
See our
Product/Technical
FAQs
Required Storage Volume: 19000 ft3 Calculate
StormTech Systems: SC - 740 Reset
StormTech Volume per Chamber: 81 6 CF w112" of stone below
Number of Chambers Needed:
233
Required Bed Size: '
8662.94
ft 2
Quantity of Stone: "
845.79
Yds3
1178.98
Volume of Excavation: "
1614.69
Yds3
Area of filter fabric' "
1058,8
Yds2
Quantity
Cost,
Total
Chambers: 233
$ 185
1 unit—
$ 43,105,00
Stone: 1178,98
$ 12.00
1 ton
$ 14.147.76
Excavation; 1614 69
$ 5.00
1 yard
$ 8,073 45
Filter Fabric: 1058.8
$ 0.50
I yard
$ 529.40
'Call 1-888-296-5367 for estimated
chamber pricing.
Subtotal $ 65.854.00
Cost per ft3 $ 3.47
* includes 10% overage for bed perimeter
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.
July 24, 20
II Z, Sear,
r
1.....•1l....,......,1.. ...«.r., n,�.�z/,iclr.•nit�?/'i�i9u`alIC11F'!`�l(' 41111111

July 20, 2006
J.W. Huggins Engineering, Inc.
Post Office Box 113 61
Southport, North Carolina 28461
Attention: Mr. Avram Adelman, EIT
Reference: Double Ring Infiltrometer Testing
4255 Lang Beach Road
Oak Island, North Carolina
S&ME Project No. 1061-06-236D
Dear Mr. Adelman:
RECEIVED
JUL. 2 l 2006
DWQ c=
>PROJ# 5wgb(rD�4'L
In accordance with S&ME Proposal 235-06 dated June 29, 2006, S&ME personnel have recently conducted
double -ring infiltrometer testing of the surficial soils at the subject site at the approximate locations shown
in Figure 1. Specifically, our representatives performed the following work items:
Advanced one hand-augered boring at the site in order to visually classify the in -
place soils. The hue and chroma of the recovered soil samples were compared to a
Munsell Soil Color Chart.
2. Conducted one double -ring infiltrometer test at a depth of 18 inches below the
existing ground surface. This testing was conducted in general accordance with
American Society for Testing and Materials (ASTM) procedure D-3385 entitled,
"Infiltration Rate of Soils in Field Using Double -Ring Infiltrometer".
Based on our field classifications of the excavated soils at the hand -angered boring location, the in -place
soil consists of sands with varying amounts of silt which extended to the maximum completed boring depth
of 76 inches below the existing ground surface, Water was encountered in the borehole at a depth of 71
inches below the existing ground surface. The site water level will fluctuate with climatic and seasonal
conditions, however, and may be higher or lower at other times of the year.
S&ME, INC. / 6409 Amsierdarn Way, Building B3 / Wilmingion, NC 213405 / p 910.799.9945 f 910.799.9958 1 www.smeinc.cam

J.W. Huggins Engineering, Inc.
S&ME Job Number 1061-06-236D
July 20, 2006
Page Two
The average infiltration rate at the test location was 14.8 inches per hour. A summary of the field test
results is presented in Tables 1 and 2.
S&ME appreciates the opportunity to provide our services during this phase of the project. Should you
have any questions after reviewing this letter, or if we can be of additional assistance, please do not hesitate
to contact us at your convenience.
Sincerely,
S&ME, INC.
Paul A. V
Environmental Professional
PAURGIVUins
Attachments
Randy Martin, P.E.
Branch Manager

Depth
Location Inches
1 0-15
15-45
45-76
TABLE 1
Hand Auger Borings
Munsell Soil Descriptions
Oak Island Building Supply
4255 Long Beach Road
Oak Island, North Carolina
S&ME Project No. 1061-06-236D
Hue Value/Chroma Soil Description
2.5 Y 511 Gray slightly silty medium to fine SAND
2.5 Y 4/4 Olive brown slightly silty medium to fine SAND
2.5 Y 7/2 Light gray slightly silty medium to fine SAND
Water was encountered at a depth of 71" below the existing ground surface.
According to the Soil Survey of Brunswick County, the area wherein HA-1 was advanced consists of the
Kureb soil series, which has a reported seasonal high water table of 6 feet below land surface.

TABLE 2
Double Ring Infiltrometer Testing
Oak Island Building Supply
4255 Long Beach Road
Oak Island, North Carolina
S&ME Project No. 1061-06-23 6D
Location: 1
Date of Test: July 13, 2006
Depth of Test Below Site Grade: 18 inches
Depth of Water in Rings: 3 inches
Depth to Water: 71"
Average Infiltration Rate: 14.8 inches per hour
High Water Table: >6 feet below land surface*
Soil Series. Kureb*
Inner Diameter of Inner Ring: 11'/4 inches
Inner Diameter of Outer Ring: 22'/z inches
Note: *As interpolated from the "Soil Survey of Brunswick County" prepared by the United States
Department of Agriculture Soil Conservation Service

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 FIGURE
RING INFILTROMETER TEST LOCATION NUMBER
CHECKED BY: PAM OAK ISLAND BUILDING SUPPLY
-rM 4255 LONG BEACH ROAD
DRAWN BY: JNS ENGINEERING • TESTING OAK ISLAND, NORTH CAROLINA
_ ENVIRONMENTAL SERVICES
DATE: 7-6-06 1 JS&ME PROJECT NUMBER: 1061-06-236D