SW8030231_HISTORICAL FILE_20060818

STORMWATER DIVISION CODING SHEET
POST-CONSTRUCTION PERMITS
PERMIT NO. SW8
DOC TYPE ❑ CURRENT PERMIT
❑ APPROVED PLANS
X,ISTORICAL FILE
❑ COMPLIANCE EVALUATION INSPECTION
DOC DATE
YYYYM DD

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2006 08 :38 RM TRUGREEN CHEMLAWN 9106865103 P. 01
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P Pages: G3 / (INCLUDRJG COVER)
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%716-2006 08 :39 AM TRUGREEN CHEMLAWN 9.106865103 P. 02
Nrr��2C,1 -.)p
ELECTION OF OFFICERS
RESOLVED FURTHER, that the following persons are appointed to the offices named, .
to serve in the offices indicated until their successors have been duly appointed and qualified:
President.............................................Todd A. Russell
Secretary.............................................Khristain.A. Russell �.
Treasurer .................. . . .......Khristain.A. Russell
A-DOPTION OF CORPORATE SEAL �r
RESOLVED, that pursuant to the Bylaws of the Corporation, the Board of
Directors adopt as the corporate seal of this Corporation a circular seal, an imprint
of which is made on the margin adjacent to this resolution.
MISCELLANEOUS ITEMS
RESOLVED, that the proper officers of the Corporation are authorized to pay or cause to
6; paid all fees and expenses incident and necessary to the organization of the Corporation; and
RE,SOLVED FURTHER, that the proper officers of the Corporation are authorized to pay
or cause to be paid any costs previously advanced on behalf of the Corporation or expenses
incurred on behalf of the Corporation prior to or subsequent to the organization; and
RESOLVED FURTHER, that the proper officers of the Corporation are authorized and
directed to do and perform all acts and things necessary and f.ppropriate to commence and carry
i)n Qie business which the corporation was formed to conduct; and
RESOLVED FURTHER, that any action taken prior to the date of these resolutions by
,:he 6ice-porator, officers or director in connection with the incorporation and organization of the
C:ca-oome -;o> are ratified and adopted as the action of the Corporation, effective as of the date such
anion was taken.
This action and these resolutions are effective as of June 6, 2005.
(SEAL)
To A. Russell, Director
o—- , (SEAL)
Khristain A. Russell, Director
A0449

SWO 030231 Lot 19 Blue Cove Express Review Comments
Subject: SWO 030231 Lot 19 Blue Cove Express Review Comments
From: Linda Lewis <[e-mail]>
Date: Fri, 11 Aug 2006 17:14:13 -0400
To: Jonathan Ham <[e-mail]>
Jonathan:
Attached please find my express review comments for this project.
Linda _
030231.aug06.doc Content-Type: application/msword
Content-Encoding: base64
I of 1 8/11/2006 5:14 PM

�OF W ATFq Michael F.Easley,Govemor
�O (r William G.Ross Jr.,Secretary
rNorth Carolina Department of Environment and Natural Resources
p Y Alan W.Klimek,P.E.Director
Division of Water Quality
August 11, 2006
Todd Russell, President
Double R, Inc., DBA TruGreen Cheml-awn
8109 Market Street
Wilmington, NC 28411
Subject: Request for Additional Information
Stormwater Project No. SW8 030231 Mod.
Lot 19 Blue Cove Subdivision
New Hanover County
Dear Mr. Russell:
The Wilmington Regional Office received some of the previously requested information regarding the
pending Express Stormwater Management Permit Application for Lot 19 Blue Cove Subdivision on July
25, 2006. The application is still incomplete. Please submit the following items in order to continue the
review:
1. Please provide official documentation of your title as President of this corporation. The
information from the Secretary of State corporate website proves only that you are the
incorporator and the registered agent for the corporation. Being a registered agent does not
make you the president of the corporation. The information we need is official
documentation such as the minutes of a meeting or a resolution of the corporation wherein
you are named as the president.
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 25, 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
ENB/arl: S:\WQS\STORMWATER\ADDINFO\2006\030231.aug06
cc: Jonathan Ham, Tripp Engineering 0.
�, ,r� ca of na
Linda Lewis Naturally
North Carolina Division of Water Quality 127 Cardinal Drive Extension Wilmington,NC 28405 Phone[phone] Customer Service
Wilmington Regional Office Intemee www.ncwalcraualitv.ore Fax [phone]
An Equal Opportunity/Affirmative Action Employer—50%Recycled1l0%Post Consumer Paper

OF `INA'Fq Michael F.Easley,Governor
�O G William G.Koss Jr..Secretary
rNorth Carolina Department of Environment and Natural Resources
1
Alan W.Klimek,P.E.Director
Division of Water Quality
August 11, 2006
Todd Russell, President
Double R, Inc., DBA TruGreen Cheml-awn
8109 Market Street
Wilmington, INC 28411
Subject: Request for Additional Information
Stormwater Project No. SW8 030231 Mod.
Lot 19 Blue Cove Subdivision
New Hanover County
Dear Mr. Russell:
The Wilmington Regional Office received some of the previously requested information regarding the
pending Express Stormwater Management Permit Application for Lot 19 Blue Cove Subdivision on July
25, 2006. The application is still incomplete. Please submit the following items in order to continue the
review:
1. Please provide official documentation of your title as President of this corporation. The
information from the Secretary of State corporate website proves only that you are the
incorporator and the registered agent for the corporation. Being a registered agent does not
make you the president of the corporation. The information we need is official
documentation such as the minutes of a meeting or a resolution of the corporation wherein
you are named as the president.
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 25, 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,
4C&-1
Linda Lewis
Environmental Engineer
ENB/arl: S:\WQS\STORMWATER\ADDINFO\2006\030231.aug06
cc: Jonathan Ham, Tripp Engineering r�On�et,Cuol;na
Linda Lewis walurally
North Carolina Division of Water Quality 127 Cardinal Drive Extension Wilmington,NC 29405 Phone[phone] Customer Service
Wilmington Regional Office Internet: www.ncwateruuality.org Fax [phone]
An Equal OpportunitylAffirmative Action Employer—50%Recycled110%Post consumer Paper

Job No. UIUI/ICC/
•J
Date: v 1
TRIPP ENGINEERING, P.C.
419 Chestnut Street, Wilmington, NC ')8401
Phone: [phone] • FAX: (910) 70C4
Email [e-mail]
a�
LETTER OF TRANSMITTAL
To: NJW
A I(� a
o
1�NQ—
Attention:
Subject:
_ FAX TRANSMITTAL: NUMBER OF PAGES INCLUDES COVER
I am sending you: �) ATTACHED ( ) UNDER SEPARATE COVER
( ) Prints ( ) Tracings ( ) Copy of letter ( ) Specifications ( ) Other
Copies Item No. Descri tion
h
G
IIRRQ�JEIVED
AUG 0 9 90015
These are transmitted as checked below:
k) For Approval ( ) For Your Use ( )ISign & Return ( ) Review
Remarks: OY�JaV
cc:
Signed:

SW8 030231 Lot 19 Blue Cove
Subject: SW8 030231 Lot 19 Blue Cove
From: "Phillip Tripp" <[e-mail]>
Date: Fri, 4 Aug 2006 14:54:35 -0400
To: "Linda Lewis" <[e-mail]>
Linda,
Please note we were intending to place the liner on the detention pond slopes that are adjacent to the
wetlands as originally proposed by Land Management Group. Our plan shows the a liner covering both
ponds entirely and that is incorrect. We are forwarding revised plans to your office. All other revisions
should be accurate as per our July 21 ,2006 re-submittal.
Thank you. Phil
l of 1 8/4/2006 3:17 PM

'QF WATF90 Michael F. Iasley,Govemor
G William G. Ross Jr.,Secretary
North Carolina Department o(Environment and Natural Resources
1 y
Q Y Alan W.Klimek,P.E.Director
Division of Water Quality
June 23, 2006
Mr. Todd Russell
Double R, Inc., DBA TruGreen Cheml-awn
8109 Market Street
Wilmington, NC 28411
Subject: Request for Additional Information
Stormwater Project No. SW8 030231 Mod.
Lot 19 Blue Cove Subdivision
New Hanover County
Dear Mr. Russell:
The Wilmington Regional Office received an Express Stormwater Management Permit
Application for Lot 19 Blue Cove Subdivision on April 26, 2006, with a scheduled Express
review date of April 27, 2006. Additional information was previously requested via letter dated
April 27, 2006. The Division also received a letter dated June 9, 2006, from Land Management
Group regarding the use of an impermeable geomembrane liner in the pond to prevent the
groundwater in the wetland from migrating into the pond and drying up the wetland. My
comments in regard to that letter are:
1 . Please use the proposed liner in the forebay as well.
2. Please provide revised plans which incorporate the April 27, 2006, review comments
in addition to the geomembrane.
3. Please provide specifications for the geomembrane, such as the name of the
company that will supply the membrane, the brand name of the membrane, the
thickness, installation requirements, maintenance requirements, and repair
procedures. If special maintenance considerations are needed, please be sure to
incorporate them into the pond maintenance agreement on the supplement.
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 July 8, 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.
NophCarolina
dl atura(/y
North Carolina Division of Water Quality 127 Cardinal Drive Extension Wilmington,NC 28405 Phone[phone] Customer Service
Wilmington Regional Office Intemec www.nc,aterquality.org Fax [phone]
An Equal Opportunity/Affirmative Action Employer—50%Recycled110%Post Consumer Paper

Mr. Russell
June 23, 2006
Stormwater Application No. SW8 030231 Mod.
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
ENB/arl: S:\WQS\STORMWATER\ADDINFO\2006\030231.jun06
cc: Jonathan Ham, Tripp Engineering
Linda Lewis
Page 2 of 2

TRII'P ENGINEERING, P.C.
0 419 Chestnut Street °
Wilmington, North Carolina 28401
Phone: [phone] FAX: [phone]
July 21, 2006
NCDENR
Division Water Quality
127 Cardinal Drive
Wilmington, NC 28405-3845
Attn: Ms. Linda Lewis
Re: Lot 19 Blue Cove
SW8 030231
TE 06018
Dear Linda:
In response to your comments dated April 27 and June 23, 2006, we offer the following:
June 23, 2006
1. The liner is proposed for the forebay as well.
2. See below.
3. Information on the geomembrane is enclosed.
April 27, 2006
1. Both ponds shall be lined with a 30 mil PVC liner to prevent drainage of the
wetlands.
2. Since the pond will be lined, the wetlands will not be used for storage and treatment.
3. The numbers on both the application and calculations have been updated to match
sheet C 1.
4. The datum assumed at 100.00' is at the centerline of the road at the center of the lot.
5. Todd Russell is now listed as president on the application and proof of Mr. Russell's
agent status is included.
6. The calculations have been updated.
7. The forebay has been corrected.
8. The detail sheet has been corrected.
9. - 11. The supplement has been corrected.
Please review for approval and contact us with any questions, comments or if you need
additional information. Thank you.
Sincerely,
Tripp Engineering, P.C.
Jonathan W. Ham, E.I. JUL 2 5 2006
JWH:dcb
Enc.

7/20/2006 Lot 19 Blue Cove 06018
JWH Stormwater Calculations
Total Drainage Area
s .ft. acres
111,078 2.55
Impervious Area
Land Use s .ft. acres
building 8,540 0.20 % impervious = 0.445
asphalt 12,691 0.29 = 44.5%
ravel 26,983 0.62 say 45.0%
concrete 1,229 0.03
Total 49,443 1.14
Stormwater Calculations:
Time of Concentration:
Hydraulic Length (L) = 600 ft.
change in Height(H) = 2 ft. CPRE= 0.25
Tc = (L'/H).-° /128 CPOST= (% imp.)(.95)+(1% imp.)(.25)
= 9.68 min. = 0.57
110= 6.30 in/hr
Flow for 10 year, 6 hour Storm (010): 150= 7.79 in/hr
QPRE_ (CPRE)x(110)x(Area)
= 4.02 cfs Flow for 50 year, 6 hour Storm (Qs0):
QPOST' (CPOST)X(110)X(Area) _ QPRE— (QPRE) x(110)x (Area)
9.16 cfs = 4.97 cfs
QPOST= (CPOST)x(110) x (Area)
Detention Pond Design: = 11.32 cfs
Pond Size:
Elevation Surface Area
ft. (sq.ft.) State Surface Area Requirement at normalpool:
Normal Pool 96.20 4,808 Pond side slopes= 3 :1
Flood Pool 98.00 7,789 Depth below N.P. = 5.5 ft.
Top of Bank 99.50 10,612 SA/DA= 0.0280
Bottom of Pool 90.20 343 (Chart for 90%TSS Removal for Wet Detention
Pond without Vegetative Filter
Required SA= (SA/DA) x(Total Drainage Area)
Total Provided Storage Volume: = 3.110 sq. ft.
Vol. _ [(Normal pool SA+ Flood Pool SA)/21
x(F.P. elev. -N.P. elev.) State Volume Requirement for Storage of first V runoff:
11,337 cu.ft. Vol. _ [(1/12)x (DA)x (% imp.)] +
[(1/12) x(DA) x (1% imp.) x C]
C = 0.2
5,148 cu. ft.
CA RO
RECEIVED
SEAL
JUL 2 5 2006 =-o 17374 a =
DWQ iGINEf
PROJ#
06018pond 1 of 2 ' Z(•QSO

7/20/2006 Lot19 Blue Cove 06018
JWH Storrnwater Calculations
Pond Volume:
Bottom SA= 343 sq. ft.
Normal Pool SA= 4,808 sq. ft.
Vol. _ [(N.P. SA+Bottom SA)/2]x(N.P. el. -Bottom el.)
= 15,452 cu. ft.
Forebav:
Required Volume
Vol. = 20% of storage volume
= 3,090 cu. ft.
Provided Volume
Bottom SA= 267 sq. ft.
Normal Pool SA= 1,957 sq. ft.
Vol. _ [(N.P. SA+ Bottom SA)/21 x(N.P. el.- Bottom el.)
3,336 cu. ft.
depth = 3 ft.
Outlet Structure Design:
Flow for 2-day drawdown: Flow for 5-day drawdown:
7for 1 st V of stormwater, for 1 st 1"of storwater,
Q storm
water,
Required Vol. / 172,800 sec. (2-days) Q= Required Vol./432,000 sec. (5-days)
0.030 cfs = 0.012 cts
Required Area of Pipe for 2-day drawdown: Required Area of Pipe for 5-day drawdown:
A= Q/[Cd x SQRT(2 x g x h)] A= Q/[Cd x SQRT(2 x g x h)]
Cd = 0.6 Cd = 0.6
g = 32.2 ft./s2 g = 32.2 ft./sz
h = (F.P.elev.- N.P. elev.)/2 h= (F.P. elev.- N.P. elev.)/2
0.9 ft. = 0.9 ft.
A= 0.0065 sq. ft. A= 0.0026 sq. ft.
Diameter of Pipe for 2-day drawdown: Diameter of Pipe for 5-day drawdown:
DIA. = SQRT[(A x 4)/pi] DIA. = SQRT[(A x 4)/pi]
= 0.0911 ft. = 0.0576 ft.
1.09 in. = 0.69 in.
Use 1.0"orifice
Outlet Structure Check:
Using a 4'x 4' Basin, Q= Cw x L x Hi.s
Perimeter L) = 16 ft. H = [Q/(Cw x Off
Cw= 3
Q= CIA = 0.33 ft.
C = (%imp.)(.95) + (1%imp.)(.25)
= 0.57 Peak elevation= flood pool elevation + H
I = 6.30 in. for a 10 yr. Storm = 98.33 ft.
A= 2.55 Acres
= 9.16 cfs
06018pond 2 of 2

Page 1 of 1
North Carolina
r
c 11` t Elaine F. Marshall DEPARTMENT OF THE
Secretary SECRETARY of STATE
PO Box 29622 Raleigh,NC 27626-0622 i.9191807-2000
Corporations Date: 7/20/2006
eCorporations Home
°Important Notice Click here to:
"Corporations FAQ View Document Filings i
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°Annual Reports 1997 Status: Current-Active
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Search Date Formed: 6/6/2005
oBy Corporate Name Citizenship: Domestic
OFor New Corporation State of Inc.: NC
06y Registered Agent
Online Orders Duration: Perpetual
°Start An Order Registered Agent
ONew Payment Procedures 9 9
Contact Us
°Corporations Division Agent Name: Russell, Todd A.
°Secretary of State's web site Registered Office Address: 8109 Market Street
Print Wilmington NC 28411
QPrintable Page Registered Mailing Address: 8109 Market Street
Wilmington NC 28411
Principal Office Address: 8109 Market Street
Wilmington NC 28411
Principal Mailing Address: 8109 Market Street
Wilmington NC 28411
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Class Shares No Par Value Par Value
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For questions or comments about the North Carolina Secretary of State's web site, please send e-mail to Webmaster.
http://www.secretary.state.ne.us/Corporations/Corp.aspx?PitemId=7760677 7/20/2006

led
me', ��iiubrc/l�o�i%
e',/gllice r)qita;2622
W'i/iriirykw� , ._/h iU (C 0olixn 28,,'(02
ii�hiJ eiil:.SIre)nie Jiri/e J.'; JUne 9, 2006 Pins.:D/O-6.i1-0060
Ili/urin�/aii,.il'�6'26'�i2Y rrrrrr./n��ion�i.nrl
TO: Linda Lewis
NCDENR Stormwater Permitting
127 Cardinal Drive Ext.
Wilmington, NC
RE: Lot#19 Blue Cove
Chesterfield Road
Castle Hayne, NC
On June 5ih, 2006 Land Management Group, Inc. conducted several soil borings on the Chesterfield Road
property owned by Mr. Todd Russell. These borings were conducted throughout the area where the stormwater
pond is proposed. Data from these borings was then used to calibrate an ellipse equation which calculated the
lateral drainage effect of the proposed stormwater feature. On-site drainage is a concern due to the proximity of
existing 404 wetlands on the property.
Our investigations determined the lateral drainage effect of the proposed stormwater feature to be approximately
108 ft. The existing wetlands on the property are currently located 15 ft. from the outer edge of the stormwater
pond and would likely be impacted by the installation of the feature. In order to eliminate hydrologic drainage of
the wetland system, Land Management Group, Inc. has recommended the use of a non-permeable geotextile
liner which reduces lateral drainage to approximately 7 ft. This liner will be installed around the entire southern
boundary of the stormwater pond and will prevent any hydrologic impact from occurring as a result of the pond
installation. The results from the ellipse equations have been attached. An edited site plan showing the locations
of the soil borings and the placement of the geotextile liner are also included.
Respectfully,
S.0 Certification
Number 57 G. Craig Turner
CEIVED Vice President
JUN 0 9 2006 Land Management Group, Inc.
NC Licensed Soil Scientist 1091

Typical Non-permeable geotextile fabric (US Fabrics, Inc.)
Web Address:
http://www.usfabricsinc.com/products/geomembranes.shtmI
Geomembranes
Geomebrane liner used in a
septic system
Geomembranes are impermeable geosynthetics that, until recently, were mainly used as canal
and pond liners. However, modern technology has broadened liner applications to include
landfills, wastewater treatment lagoons, oil exploration, aquaculture, irrigation ponds and
remediation. In many of these applications, a nonwoven geotextile is used as cushion to
protect the geomembrane. In general, geomembrane liners offer excellent puncture resistance
and can withstand a wide range of chemicals and temperatures. They are also highly flexible
and conform well to the subgrade.
a •r
PVC liners have been successfully used for containment applications since the 1960's. PVC
geomembranes have proven especially effective in dealing with limited site access, long haul
distances and areas where freeze and thaw are an issue. One of the largest current
applications for PVC geomembranes is the containment of hazardous and municipal wastes
and their leachates. PVC geomembranes can be factory fabricated into large panels to
minimize field sewing. However, they are also easily spliced in the field.
Polyw ene 'Hers
Polyethylene liners (HDPE, LLDPE) typically offer superior tensile strength and stiffness and
are resistant to chemicals and puncture. These geomembranes are safe for potable water
containment and can be fabricated into panels of up to one acre in size.
Whether your specification calls for HDPE, LLDPE, or PVC, US Fabrics has the liner to fit your
needs. With standard roll sizes up to 22.5 feet wide, as well as custom fabricated panels, we
can provide a geomembrane to fit your site-specific dimensions.

Ellipse Equation to determine drain spacing(S)or lateral distance of effective drainage(Le)
S=sgrt[(4K)x(m2+tam)/q ]; Le=S/2
Note Todd Russell Lot#19 Blue Cove Spacing&Distance to 1 ft drainage effect from 5 ft SW pond.
S =drain spacing required to alter water table to desired depth"m"(ft)----------------------------------------------- 109.54
Le =linear distance of drainage effect from ditching with desired inputs(ft)------------- ---------------- 54.77
K=weighted hydraulic conductivity above restrictive layer infir --------------- ----------—-------------—--------- 2.00
m =desired vertical distance after drawdown of water table above drain at mid point between drains(ft)------ 3.00
a =depth of restrictive layer below drain(ft)------------------------------------------------------------------------------- -1.00
q =drainage rate(in/hr), rate water is removed to not exceed desired depth for specified time period------------- 0.002
q= [(porosity x depth water table lowered)+ rainfall-ET]/[lime to lower water table for critical time period]
Typical range for: "p" 0.05 clays-0.30 sands; 'T' 2-21 days; "q" 0.005-0.100 in/hr
4 x K 8.00
mZ 9.00
2xaxm -6.00
4K x mZ+tam 24.00
4K x(m2+2am)/q 12000.00
sqrt[4K x(m2+2am)/q] 109.54

Ellipse Equation to determine drain spacing(S)or lateral distance of effective drainage(Le)
S=sgrt[(4K)x(m2+ tam)/q]; Le=S/2
Note Todd Russell Lot 919 Blue Cove Spacing&Distance to 1 ft drainage effect from 5 ft SW pond
S =drainspacing required to alter water table to desired depth"m" k - ----------------- 6.48
Le =linear distance of drainage effect from ditching with desired inputs(ft)--------------------------------------------------- 3.24
K=weighted hydraulic conductivity above restrictive layer(in/hr)---------------------------------------------------------------- 0.01
m =desired vertical distance after drawdown of water table above drain at mid point between drains(ft)—-------- 3.00
a=depth of restrictive layer below drain (ft)----------------------------------------------------------------------------------------- -1.00
q=drainage rate(in/hr), rate water is removed to not exceed desired depth for specified time period----------------- 0.002
q= [(porosity x depth water table lowered)+ rainfall-ET]/[time to lower water table for critical time period]
Typical range for: "p" 0.05 clays-0.30 sands; "C 2-21 days; "q" 0.005-0.100 in/hr
4 x K 0.03
mZ 9.00
2xaxm -6.00
4K x m2+ 2am 0.08
4K x(m2+2am)/q 42.00
sqrt[4K x(m2+2am)/q] 6.48

Re: [Fwd: Re: Lot 19 Blue Cove Add. Info. SW8 0302311]
. r
Subject: Re: [Fwd: Re: Lot 19 Blue Cove Add. Info. SW8 030231]]
From: 'Phillip Tripp" <[e-mail]>
Date: Tue, 30 May 2006 09:42:40 -0400
To: "Linda Lewis" <[e-mail]>
Linda,
I got your email. We are working with a soil scientist to model the clay liner and
be sure it provides the proper seal between pond and wetland. Should be back with
you by next week. Thank you.
Phil
----- Original Message ----- From: "Linda Lewis" <[e-mail]>
To: "Phil Tripp" <[e-mail]>; "Tripp Engineering" <[e-mail]>
Sent : Monday, May 22, 2006 4 :05 PM
Subject : [Fwd: [Fwd: Re: Lot 19 Blue Cove Add. Info. SW8 03023111
Phil:
Forwarded message from May 2, 2006. The ball is in your court in regard
to demonstrating to us that a clay liner will also deal with the water
level issue (i.e. , keeping the water level in the pond at or below the
permanent pool. )
Linda
I of 1 6/l/2006 7:40 AM

Ponds adjacent wetlands
Subject: Ponds adjacent wetlands
From: Linda Lewis <[e-mail]>
Date: Mon, 01 May 2006 17:30:07 -0400
To: Ken Pickle <[e-mail]>
CC: Robert Gordon <[e-mail]>, Bill Moore <[e-mail]>, Roger
Thorpe <[e-mail]>, Scott Vinson <[e-mail]>, Bradley Bennett
<bradley.bennett@ncmai l.net>
Ken:
How do you feel about a pond's permanent pool being 3 .3 feet lower than an
immediately adjacent wetland, and the consultant proposing to provide an
"impervious" clay lining on the closest pond slope to prevent migration of the
water from the wetland into the pond? The wetland appears to be isolated, and the
current plan is to bypass the wetland completely, with the intent, (I assume) being
to dry up the wetland to free up that area for future construction. Can a simple
clay liner withstand that kind of outer hydraulic pressure? Instead of keeping
water inside the pond from migrating out, the clay is there to keep groundwater
under a driving head, from migrating into the pond.
Maybe I need to ask for a current groundwater elevation.
Thanks,
Linda
1 of 1 5/I/2006 5:46 PM

Lot 19 Blue Cove Add. Info. SW8 030231
Subject: Lot 19 Blue Cove Add. Info. SW8 030231
From: 'Phillip Tripp" <[e-mail]>
Date: Mon, 1 May 2006 10:02:12 -0400
To: "Linda Lewis" <[e-mail]>
Linda,
As an option, can we line the pond banks with clay to create a impermeable barrier and allow us to
maintain our pond and piping as is?
We can provide details and soils data for the clay construction,
lease let me know.
Thanks.
Phil
I of 1 5/1/2006 5:46 PM

Lot 19 Blue Cove SW8 030231
Subject: Lot 19 Blue Cove SW8 030231
From: Linda Lewis<[e-mail]>
Date: Fri, 28 Apr 2006 09:21:32 -0400
To: Jonathan Ham<[e-mail]>
Jonathan:
I spoke to Noelle late yesterday regarding the use of the wetland as a forebay. She
is in agreement as long as the wetland is an isolated wetland. Prior to making any
of the suggested changes, please determine as to whether or not this is an isolated
wetland.
If it is, please make the recommended changes. If not, the original plan will still
need to be revised somewhat to deal with the permanent pool elevation being so far
below the elevation of the wetland. The flow of water into the pond from the
wetland may cause the permanent pool elevation to be much higher than you
anticipate it being. The permanent pool elevation should be at or above the
seasonal high water table.
Thanks,
Linda
I of 1 4/28/2006 9:23 AM

Lot 19 Blue Cove SW8 030231 Mod.
Subject: Lot 19 Blue Cove SW8 030231 Mod.
From: Linda Lewis <linda.lewis n ncmail.net>
Date: Thu, 27 Apr 2006 11:50:52 -0400
To: Jonathan Ham <[e-mail]>
Jonathan:
Attached please find my Express review comments regarding this application. A hard
copy will follow via regular mail.
Linda
Content Type: application/msword
030231 apr06.doc
Content Encoding: base64
I of 1 4/27/2006 12:01 PM

F WATF
t �� 9Q Michael P.Easley,Governor
✓ Q 7 William G.Ross Jr.,Secretary
r- North Carolina Department of Environment and Natural Resources
O C Alan W.Klimek,P.E.Director
Division of Water Quality
April 27, 2006
Mr. Todd Russell
Double R, Inc., DBA TruGreen ChemLawn
8109 Market Street
Wilmington, NC 28411
Subject: Request for Additional Information
Stormwater Project No. SW8 030231 Mod.
Lot 19 Blue Cove Subdivision
- - - -New Hanover County _. ..
Dear Mr. Russell:
The Wilmington Regional Office received an Express Stormwater Management Permit
Application for Lot 19 Blue Cove Subdivision on April 26, 2006, with a scheduled review date
of April 27, 2006. A preliminary review of that information has determined that the application
is not complete. The following information is needed to continue the stormwater review:
1. To avoid drying up the wetland, please raise the pond's water level of 96.2, which is
approximately 3.3 feet below the wetland elevation, to at least 99.5. The pond's
water level needs to be high enough such that it will not cause the migration of water
from the wetland into the pond, and ultimately, to draw down the water table in the
wetland to the point that the wetland ceases to exist.
2. Once the water level of the pond is raised, please remove both proposed forebays
and use the isolated wetland as the forebay. This may save some grading and
piping. Where the pipes enter the wetland, provide some type of energy
dissipation/level spreader so that the wetland is not scoured. Install a riser structure
from the wetland into the pond that overflows at the raised permanent pool elevation.
You have diverted all the water that used to feed this wetland. By using the wetland
as the forebay, the wetland will continue to receive runoff and will not dry up. Please
deepen the "attached" forebay area to be counted as main pond area.
3. The built-upon area numbers used in the calculations do not match up to the
numbers reported on the application.
4. Please identify the 100' benchmark elevation that was used for these contours and
place it on the plans.
5. Please report your title within the corporation in Section 1.2 of the application.
Section .1003 (e) of the stormwater rules requires that a person of at least the level
of vice president in the corporation sign the application and supplement. The
signature of an agent or the consultant can be accepted only if accompanied by a
signed letter of authorization from the president or vice president of the corporation.
6. Since the pond depth varies, please use the average pond depth rounded down to
the nearest .5' to determine the required minimum surface area. For this pond, the
average depth is 5.67', rounded down to 5.5'. The minimum surface area for a 5.5'
deep pond is 3,186 sq. ft.,-so the provided surface area of 4,806 sq. ft. is stil I
sufficient. Please revise the calculations to reflect this change. No"hcarolina
l aturally
North Carolina Division of Water Quality 127 Cardinal Drive Extension Wilmington,NC 28405 Phone[phone] Customer Service
Wilmington Regional Office Internet: www.newaterauality ore Fax [phone] I-877-623-6748
An Equal OpportunitylAffrmative Action Employer—50%Recycled110%Post Consumer Paper

Mr. Russell
April 27, 2006
Stormwater Application No. SW8 030231 Mod
7. The provided forebay volume is a little over the required maximum allowable, at
22.5%. Since the forebay is shallower than the main pond, please reduce the
forebay volume to the acceptable range of 18%-22%. If you use the wetlands as
the forebay, the Division will waive this sizing requirement.
8. The calculations and supplement both report that a 1"m orifice is to be provided
however the outlet structure detail indicates a 0.75"0 orifice. Please revise.
9. The supplement reports a permanent pool surface area of 5,288 sq. ft., however
the calculations report 4,806 sq. ft. Please revise.
. -10. . The supplement reports a temporary pool volume of 12,646 cubic feet, however-
the calculations report 11,336 cubic feet. Please revise.
11. The supplement reports a permanent pool volume of 15,641 cubic feet, however
the calculations report 15,291 cubic feet. Please revise.
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 May 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 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
ENB/arl: S:\WQS\STORMWATER\ADDINFO\2006\030231.apr06
cc: Jonathan Ham, Tripp Engineering
Linda Lewis
Page 2 of 2

Page 1 of 1
North Carolina
Elaine F. Marshall DEPARTMENT OF THE
Secretary SECRETARY OF STATE
m�u°'gib PO Box 29622 Raleigh. NC 27626-0622 [phone]
Corporations Date: 4/27/2006
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http://www.secretary.state.nc.us/Corporations/Corp.aspx?Pitemld=7760677 4/27/2006

SOSI D: 0513200
Date Filed: 6/6/2005 4:00:00 PM
Elaine F.Marshall
North Carolina Secretary of State
C200515700124
State of North Carolina
Department of the Secretary of State
Articles of Incorporation and Conversion
(Conversion of Business Entity)
Pursuant to §55-2-02 and §55-11A-03 of the General Statutes of North Carolina, the
undersigned does hereby submit these Articles of Incorporation and Conversion for the purpose
of forming a North Carolina corporation pursuant to a conversion of another business entity.
ARTICLES OF INCORPORATION
I. NAME
The name of the corporation is DOUBLE R, INC.
II. PURPOSE
The purpose for which the corporation is organized is to engage in any lawful act or activity
for which the corporation may be organized under the North Carolina Business Corporation Act.
III. CAPITAL STOCK
The total number of shares the corporation shall have authority to issue is One Hundred
Thousand (100,000). These shares shall be all of one class, designated as common stock, with no
par value.
IV. REGISTERED OFFICE AND AGENT
The address of the initial registered office of the corporation is 8109 Market St.,
Wilmington, New Hanover County, North Carolina 28411, and the name of the initial registered
agent at such address is Todd A. Russell. The mailing address and principal office of the
corporation is 8109 Market St., Wilmington,New Hanover County,North Carolina 28411.
V. NAME AND ADDRESS OF INCORPORATOR
The name and street address of the incorporator are:
Name Street Address
Todd A. Russell 8109 Market St.
Wilmington,NC 28411
VI. LIMITATION OF LIABILITY
No director of the corporation shall have personal liability arising out of an action whether
by or in the right of the corporation or otherwise for monetary damages for breach of any duty as a
58874 1

director; provided, however, that the foregoing shall not limit or eliminate the personal liability of a
director with respect to (i) acts or omissions that such director at the time of such breach knew or
believed were clearly in conflict with the best interests of the corporation, (ii) any liability under
Section 55-8-33 of the North Carolina General Statutes or any successor provision, (iii) any
transaction from which such director derived an improper personal benefit, or(iv) acts or omissions
occurring prior to the date of the effectiveness of this Article VI. As used in this Article VI, the term
"improper personal benefit" does not include a director's reasonable compensation or other
reasonable incidental benefit for or on account of his or her services as a director, officer, employee,
independent contractor, attorney,or consultant of the corporation.
Furthermore, notwithstanding the foregoing provision, in the event that Section 55-2-02 or
any other provision of the North Carolina General Statutes is amended or enacted to permit further
limitation or elimination of the personal liability of directors of corporations,the personal liability of
the corporation's directors shall be limited or eliminated to the fullest extent permitted by the
applicable law.
This Article VI shall not affect any provision permitted under the North Carolina General
Statutes in the articles of incorporation, bylaws or contract or resolution of the corporation
indemnifying or agreeing to indemnify a director against personal liability. Any repeal or
modification of this Article VI shall not adversely affect any limitation hereunder on the personal
liability of the director with respect to acts or omissions occurring prior to such repeal or
modification.
t,
VU. EFFECTIVE DATE
These Articles of Incorporation and Conversion shall be effective upon filing,
ARTICLES OF CONVERSION
I. FORMATION OF CORPORATION PURSUANT TO CONVERSION
The corporation is being formed pursuant to the conversion of another business entity.
1I. NAME AND TYPE OF CONVERTING ENTITY
The converting business entity is DOUBLE R, LLC, a North Carolina limited liability
company.
58874 2

III. GOVERNING LAW
The organization and internal affairs of the converting business entity are governed by
the laws of the state of North Carolina.
IV. PLAN OF CONVERSION
A plan of conversion has been approved by the convening business entity as required by
law.
This is the 2- day of Z'u✓t e 2005.
Todd A.Russell, Incorporator
58874 3

LC-
�e,.r
TRIPP ENGINEERING, P.C.
0 419 Chestnut Street
Wilmington, North Carolina 28401
Phone: [phone] • FAX: [phone]
April 5, 2006 ..ECEY V ED
NCDENR APR 2 6 2006
Division Water Quality
127 Cardinal Drive DWQ
Wilmington, NC 28405-3845 PROJ #
Attn: Mr. Cameron Weaver 's6oeo �30 3/ 1-fw,
Re: Lot 19 Blue Cove— EXPRESS REVIEW
New Hanover County, NC
TE 06018
Dear Cameron:
Enclosed please find two (2) sets of plans, one (1) signed original and one (1)
copy of the application form with narrative, one (1) wet detention basin supplement, two
(2) sets of calculations and one check for the express review fee.
Please review for approval and contact us with any questions or comments.
Thank you.
Sincerely,
Tripp Engineering, P.C.
JOOOJonathan W. Ham, E.I.
JWH:dcb
Enc.

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April 5, 2006 TE 06018
Stormwater Narrative
Lot 19 Blue Cove
New Hanover County,NC
Lot 19 Blue Cove is an existing vacant lot within a commercial subdivision. The lot is
proposed as high density development to be treated by wet detention. Two proposed
buildings of 8,540 sf with 12,691 sf of asphalt parking and access, 26,983 sf of gravel
parking, and 1,229 sf of concrete sidewalks create a total of 49,443 sf of impervious area.
Runoff from this site will be treated by wet detention designed for the 1" requirement as
well as the County's 25-year pre-post requirement. Outflow will be routed to Smith
Creek, classification C-SW.
RECEIVED
APR 2 6 2006
DWQ
PROJ #

SOSID: 0513200
Date Filed: 6/6/2005 4:00:00 PM
Elaine F. Marshall
North Carolina Secretary of State
C200515700124
State of North Carolina
Department of the Secretary of State
Articles of Incorporation and Conversion
(Conversion of Business Entity)
Pursuant to §55-2-02 and §55-11A-03 of the General Statutes of North Carolina, the
undersigned does hereby submit these Articles of Incorporation and Conversion for the purpose
of forming a North Carolina corporation pursuant to a conversion of another business entity.
ARTICLES OF INCORPORATION
I. NAME
The name of the corporation is DOUBLE R,INC.
II. PURPOSE
The purpose for which the corporation is organized is to engage in any lawful act or activity
for which the corporation may be organized under the North Carolina Business Corporation Act.
III. CAPITAL STOCK
The total number of shares the corporation shall have authority to issue is One Hundred
Thousand (100,000). These shares shall be all of one class, designated as common stock, with no
par value.
IV. REGISTERED OFFICE AND AGENT
The address of the initial registered office of the corporation is 8109 Market St.,
Wilmington, New Hanover County, North Carolina 28411, and the name of the initial registered
agent at such address is Todd A. Russell. The mailing address and principal office of the
corporation is 8109 Market St., Wilmington,New Hanover County,North Carolina 28411.
V. NAME AND ADDRESS OF INCORPORATOR
The name and street address of the incorporator are:
Name Street Address
Todd A. Russell 8109 Market St.
Wilmington,NC 28411
VI. LIMITATION OF LIABILITY
No director of the corporation shall have personal liability arising out of an action whether
by or in the right of the corporation or otherwise for monetary damages for breach of any duty as a
58874 1

director; provided,however, that the foregoing shall not limit or eliminate the personal liability of a
director with respect to (i) acts or omissions that such director at the time of such breach knew or
believed were clearly in conflict with the best interests of the corporation, (ii) any liability under
Section 55-8-33 of the North Carolina General Statutes or any successor provision, (iii) any
transaction from which such director derived an improper personal benefit, or(iv)acts or omissions
occurring prior to the date of the effectiveness of this Article VI. As used in this Article VI, the term
"improper personal benefit" does not include a director's reasonable compensation or other
reasonable incidental benefit for or on account of his or her services as a director, officer, employee,
independent contractor,attorney, or consultant of the corporation.
Furthermore, notwithstanding the foregoing provision, in the event that Section 55-2-02 or
any other provision of the North Carolina General Statutes is amended or enacted to permit further
limitation or elimination of the personal liability of directors of corporations,the personal liability of
the corporation's directors shall be limited or eliminated to the fullest extent permitted by the
applicable law.
This Article VI shall not affect any provision permitted under the North Carolina General
Statutes in the articles of incorporation, bylaws or contract or resolution of the corporation
indemnifying or agreeing to indemnify a director against personal liability. Any repeal or
modification of this Article VI shall not adversely affect any limitation hereunder on the personal
liability of the director with respect to acts or omissions occurring prior to such repeal or
modification.
VII. EFFECTIVE DATE
These Articles of Incorporation and Conversion shall be effective upon filing.
ARTICLES OF CONVERSION
I. FORMATION OF CORPORATION PURSUANT TO CONVERSION
The corporation is being formed pursuant to the conversion of another business entity.
II. NAME AND TYPE OF CONVERTING ENTITY
The converting business entity is DOUBLE R, LLC, a North Carolina limited liability
company.
58874 2

III. GOVERNING LAW
The organization and internal affairs of the converting business entity are governed by
the laws of the state of North Carolina.
IV. PLAN OF CONVERSION
A plan of conversion has been approved by the converting business entity as required by
law.
This is the Z day of Z'u v% e 2005.
Todd A. Russell,Incorporator
58874 3

• 0lofl18
got ��Da�;C�R
q
ormTech
i " kaflm-aaaNbn-xmup
+ : •6,� ~t'. ' +^ + Subsurface Stormwater Management"
Thermoplastic Liners for Detention Systems Tech Sheet At 2
Rev. 919/04
General:
StormTech chambers offer the distinct advantage and versatility that allow them to be
designed as an open bottom detention or retention system. In fact the vast majority of
StormTech installations and designs are open bottom detention systems. Using an open
bottom system enables treatment of the storm water through the underlying soils and provides a
volume safety factor based on the infiltrative capacity of the underlying soils.
In some applications, however, open bottom detention systems may not be allowed. This
memo provides guidance for the design and installation of thermoplastic liners for detention
systems using StormTech chambers. The major points of the memo are:
• Infiltration of stormwater is generally a desirable stormwater management practice, often
required by regulations. Lined systems should only be specified where unique site
conditions preclude significant infiltration.
• Thermoplastic liners provide cost effective and viable means to contain stormwater in
StormTech subsurface systems where infiltration is undesirable.
• PVC and LLDPE are the most cost effective, installed membrane materials.
• Enhanced puncture resistance from angular aggregate on the water side and from
protrusions on the soil side can be achieved by placing a non-woven geotextile
reinforcement on each side of the geomembrane. A sand underlayment in lieu of the
geotextile reinforcement on the soil side may be considered when cost effective.
• StormTech does not design, fabricate, sell or install thermoplastic liners. StormTech
recommends consulting with liner professionals for final design and installation advice.
Membrane Materials:
Polyvinyl chloride (PVC) is an effective liner material for StormTech systems. PVC
offers good chemical resistance to contaminant concentrations typical of highway runoff and to
chlorides from road salting applications. Non-reinforced 30 mil PVC liners are recommended for
StormTech systems. PVC is flexible. It can be folded without damage and is typically
prefabricated and shipped to the jobsite. Panels as large as 20,000 sqft can be prefabricated
into a 4000 lb panel (30 mil is 0.195 Ibs/sgft, SG = 1.2). PVC has the versatility to be field
solvent welded, taped or field heat welded. A very significant advantage of PVC is that an
excavation contractor can install a PVC liner without specialty crews. Solvent welding of seams,
patches and pipe boots can all be done by the excavation contractor making PVC the lowest
cost liner alternative.
The PVC compound includes fillers and plasticizers to reduce cost and UV inhibitors to
extend the service life under exposure to sunlight. Under prolonged sunlight exposures such as
in a permanent surface pool, these additives can leach into the pool and reach concentrations

Page 2 of 6
Tech Sheet#2
Rev. 9/9/04
harmful to aquatic life. PVC compounds referred to as "fish safe" are sometimes used for surface pond
liners and may be considered for StormTech liners. However, since StormTech systems are subsurface,
there is no opportunity for UV attack by sunlight. Also since stormwater is detained for short durations,
typically 48 hours or less, there is little opportunity for accumulation of leachates. Therefore PVC is an
excellent membrane material for thermoplastic liner detention systems.
Recommended Configuration: 30 mil PVC with 8 ounce non-woven reinforcement fabric underlayment
and overlayment, open top with high flow bypass.
Recommended Restriction: Do not use for fuel spill containment.
Linear low density polyethylene (LLDPE) is a very inert material that offers excellent chemical
resistance and is "fish safe". LLDPE is an effective liner system for StormTech systems, particularly for
small projects where the entire liner can be prefabricated in one piece or when using taped seams.
LLDPE is flexible up to 30 mil but thicknesses greater than 30 mil should not be folded without potential
damage. 30 mil LLDPE is recommended. Extra care should be taken to protect against puncture. A
minimum 8-ounce non-woven fabric reinforcement underlayment and 12-ounce overlayment should be
specified. The underlayment reinforcement should be increased to 12-ounce where water tightness is
essential and increased puncture risk exists. Panels as large as 27,000 sgft can be prefabricated into a
4000 lb roll (30 mil is 0.15 Ibs/sgft). LLDPE has a specific gravity less than 1.0. LLDPE seams can be
taped or field heat welded. Installation costs may increase if field seaming by a specialty contractor is
required.
Recommended Confouration: 30 mil LLDPE with 8 ounce non-woven reinforcement fabric underlayment
and 12-ounce overlayment, open top with high flow bypass.
Recommended Restriction: Do not use for fuel spill containment.
Reinforced Polypropylene (RPP), EPDM and XR-5 are excellent materials for lining systems
due to their flexibility, durability and excellent chemical and UV resistance. Although excellent lining
materials, they generally exceed the engineering requirements for typical applications and are higher in
cost than PVC or LLDPE. For fuel and oil concentrations normally found in storm water from parking
and roadways, PVC, LLDPE and PP are suitable. However, if containment of aggressive contaminants,
fuels or fuel spills are anticipated, a liner professional should be consulted. XR-5 in thicknesses of 30 mil
or more, with welded seams may be suitable.
Polyethylene (PE) materials are generally inert, offer excellent chemical resistance and are "fish
safe". Although medium density polyethylene (MDPE) liners are widely used for sanitary landfills and
fish ponds, they are generally much higher in total cost and are not likely to
be cost effective StormTech lining materials. High density polyethylene (HDPE) is not flexible enough
to resist puncture and conform to the excavation. Cost aside, MDPE is an acceptable
liner material for StormTech systems but should be limited to subgrades that are well prepared, without
protrusions and must be field seamed.

Page 3 of 6
Tech Sheet#2
Rev. 9/9/04
Reinforcement Materials:
6-ounce ADS 0601 or equal
(M288 Class 2 Std StormTech separation fabric) over the top of stone
8-ounce ADS 0801 or equal
for use as reinforcement for PVC, RPP and LLDPE
12-ounce ADS1201 or equal
for use as reinforcement for LLDPE and other PE membranes
Seaming Options:
1. Prefabricated vs. Field Prefabricated seams are preferable to field seams for all liner materials
whenever possible.
2. Solvent Welded PVC only, low cost
3. Heat Welded Costly, require trained seamer, for all liner materials .
4. Taped Cost effective, M50-RC Gray distributed by Titus Industrial Group recommended, single
sided, 4"width, for all liner materials. No water tightness data is available
5. Overlapped Not water tight, no leakage rates available, suggest 4 ft overlap for all materials.
Pipe 'boots" are used to seal pipe penetrations through the liner. Boots can either be prefabricated by
the liner fabricator or field fabricated by the contractor. The boot is then solvent cemented, heat welded
or taped to the liner. A pipe clamp is normally used to seal the boot around the pipe. Seaming and
sealing pipe boots at low temperatures (32' F minimum) requires preheating of the material.
Design:
General The design of a lined system must be performed by the consulting engineer and, at
minimum, requires knowledge of design storage, peak flow rates and maximum seasonal high
groundwater elevation. This information is used to design the peak flow control structure, maximum liner
height and groundwater control (if necessary).
High Flow Bypass A high flow control is an important component for any lined system. The high
flow control is designed to pass the peak flow while ensuring that the liner is not overtopped. The control
structure can be an upstream high flow bypass or a downstream overflow structure. In both cases, a
high flow weir, very similar to the high flow control in a pond outlet control structure, is normally used.
The high flow weir should be sized such that the water surface elevation based on the maximum head on
the weir is less than the top of the liner. Additional freeboard should be provided.
In a typical upstream bypass design, the calculated depth of flow over the weir (H) is subtracted
from the maximum water surface elevation in the chamber system to establish the weir crest elevation.
The storage in the chamber system associated with the weir crest elevation may be a design constraint.
The designer may choose to increase the weir length and therefore decrease the flow depth to establish
a higher weir crest.

Page 4 of 6
Tech Sheet#2
Rev. 9/9/04
The equation for a rectangular weir is:
_ H = (Q /(Cd x L))ys
HIGH FLOW H Where: Q = flow over the weir(cfs)
BYPA
STRUCTURE/ r Cd = discharge coefficient= 3.3
H = Depth of flow over crest(ft)
WEIR / L = length of weir(ft)
In a typical downstream overflow design, the designer may incorporate one or more low flow
orifices into the high flow weir wall. The weir crest is established as described above but hydraulic
losses from the inlet to chamber to the outlet structure may need to be considered. Losses may be
factored in by lowering the weir crest or increasing the liner freeboard.
Buoyancy StormTech recommends against installing lined chamber systems below groundwater.
Although the total weight of a chamber system generally exceeds the buoyant force, a limiting stability
condition may result when the buoyant pressure exceeds the resistance pressure directly under the
chamber. This could result in a heave of the bedding under the chamber leading to instability. To
,prevent adverse impacts from ground water, where gravity discharge is possible, StormTech
recommends the installation of an underdrain system under the liner. Where there is a potential buoyant
force, StormTech recommends a sufficient stone bedding thickness, such that the weight of stone
exceeds the maximum buoyant force.
The bedding thickness calculation is simplified by ignoring any structural contribution from the
liner and reinforcing material and considering only the weight of the stone in the thinnest area of the
bedding, which is located under the chamber.
The relationship between bedding thickness and maximum allowable groundwater elevation is:
�...... .......ry Hg,, x (62.4 Ib/ft)= (Ystone x t) / SF
Where:
t H9„, = height of groundwater above liner bottom
(inches)
Hgw Ystone = bulk density of bedding stone(Ib/ft)
/ 4"HDPE } 1 t =thickness of stone bedding (inches)
UNDERDRAIN(TYP.) SF = safety factor(1.5 typical minimum)
The bulk density of the open graded stone bedding materials varies from about 75 Ibs/ft3 to over
100 Ibs/ft3. Without specific bulk density information for the stone actually used, StormTech
recommends using not more than 75 Ibs/ft3'

Page 5 of 6
Tech Sheet#2
Rev. 9/9/04
Installation:
Installation should be in accordance with the liner manufacturer's instructions. Associations
representing membrane materials have developed installation standards for the respective lining
materials as follows:
• "PVC Geomembrane Fabrication and Installation Document" by the PGI (PVC Geomembrane
Institute) January 2000 http://Pqi-to.cee.uiuc.edu/forweb/fabAndinstall.pdf
• "HDPE Geomembrane Installation Specification" by the International Association of Geosynthetic
Installers. Revised February 2000
PVC and LLDPE liners should not be installed at temperatures less than 32° F or on windy days.
Wind can catch the liner and be extremely dangerous to laborers. Stones and other protrusions should
always be removed from the excavation. Rolling or compacting is recommended to knock down any
remaining protrusions. The non-woven underlayment fabric is then placed in the excavation, the
membrane placed, and a fabric reinforcement placed over the membrane. Liners are flapped by laborers
to get air under the liner to enable easy drag across bed. Corners are generally formed by folding or
"pleating"excess liner material.
An anchor trench" about 12" deep by 12" wide may be dug
around the top of the excavation to anchor the top of the reinforcement fabric and thermoplastic liner at
the top of the excavation. Stone should be placed carefully to avoid puncture from long free falls.
Similarly, additional care must be taken when spreading and compacting bedding stone to prevent
stones from puncturing the liner during construction.
THERMOPLASTIC MEMBRANE
REINFORCEMENT FABRIC REINFORCEMENT FABRIC
FREEBOARD(FB) —
LINED STORAGE (h)_ ANCHORLENGTH
- _ - I II LIL-IL-II�- I.JI-
I- -II I-I- - �I���I={L - �-
W
Estimating Liner Material:
Liner fabricators require dimensional details to design panels and provide firm material
quotations. The liner and reinforcing fabric quantities should include sidewalls and extra material for
anchoring during installation. The excavation contractor should use care not to overexcavate since a
larger excavation would require additional liner materials.
The fabricated sheet size for estimating purposes is calculated as follows:
Panel Size= [W+ 2(h + FB +AL)] x [L + 2(h + FB + AL)]
Where:
W = system width from StormTech layout drawing
L = system length from StormTech layout drawing
FB = freeboard based on engineer's advice (0.5'typical)

Page 6 of 6
Tech Sheet#2
Rev. 9/9/04
AL = anchor length of membrane and reinforcement to tie back sidewall material
during installation and backfill of chambers (4' typical)
The location and size of pipe penetrations should also be summarized for the fabricator.
I J
� I
I W
L -{
Estima
ting Worksheet:
AL AL
h+ FB
W
F-- W -I
i
[ L
24" HDPE PIPE PENETRATION (EG.)
Panel Size= [W+ 2(h + FB +AL)] x [L + 2(h + FB +AL)]
DISCLAIMER
The information provided in this publication is general information regarding products of StormTech, LLC. SUCH
INFORMATION IS PROVIDED ON AN "AS-IS" BASIS WITHOUT REPRESENTATION OR WARRANTY OF ANY KIND,
EITHER EXPRESS OR IMPLIED, INCLUDING THE IMPLIED WARRANTIES OF FITNESS FOR A PARTICULAR PURPOSE,
BEING FREE OF DEFECTS AND ERRORS, MERCHANTABILITY AND NONINFRINGEMENT. STORMTECH, LLC
EXPRESSLY INTENDS SUCH INFORMATION TO BE SOLELY FOR GENERAL INFORMATIONAL AND PROMOTIONAL
PURPOSES.
Furthermore,such products of StormTech, LLC described in this publication may contain components manufactured by third
parties. STORMTECH, LLC MAKES NO REPRESENTATIONS OR WARRANTIES OF ANY KIND, EITHER EXPRESS OR
IMPLIED, INCLUDING THE IMPLIED WARRANTIES OF FITNESS FOR A PARTICULAR PURPOSE, BEING FREE OF
DEFECTS AND ERRORS, MERCHANTABILITY AND NONINFRINGEMENT, REGARDING ANY COMPONENTS OF ITS
PRODUCTS MANUFACTURED BY THIRD PARTIES, INCLUDING WITHOUT LIMITATION LINERS THAT MAY BE
INCORPORATED INTO ITS PRODUCTS.

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