NCG140406_COMPLETE FILE - HISTORICAL_20130520

STORMWATER DIVISION CODING SHEET
RESCISSIONS
PERMIT NO.
/vc,�j I yQ tt/Q �p
DOC TYPE
❑COMPLETE FILE -HISTORICAL
DATE OF
RESCISSION
❑ o'C6
YYYYMMDD

fi'A
NCDENR
North Carolina Department of Environment and Natural
Division of Water Quality
Pat McCrory Charles Wakild, P.E.
Governor Director
May 20, 2013
Adam Mathews
Flatiron -Lane Batch Plant
105 Jacobs Lambe Ln
Salisbury, NC 28146
Resources
John Skvarla, III
Secretary
Subject: Rescission of NPDES Stormwater Permit
Certificate of Coverage Number NCG 140406
Flatiron -Lane Batch Plant
Davidson County
Dear Mr. Mathews:
On 4/09/2013, the Division of Water Quality received your request to rescind your coverage under
Certificate of Coverage Number NCG 140406. 1n accordance with your request, Certificate of Coverage
Number NCG 140406 is rescinded effective immediately.
Operating a treatment facility, discharging wastewater or discharging specific types of stormwater to
waters of the State without valid coverage under an NPDES permit is against federal and state laws and
could result in fines. If something changes and your facility would again require stormwater or
wastewater discharge permit coverage, you should notify this office immediately. We will be happy to
assist you in assuring the proper permit coverage.
If the facility is in the process of being sold, you will be performing a public service if you would inform
the new or prospective owners of their potential need for NPDES permit coverage.
1f you have questions about this matter, please contact Boyd DeVane at 919 807-6373, or the Water
Quality staff in our Winston-Salem Regional Office at 336-771-5000.
Sincerely,
for Charles WakiId, P.E., Director
cc: Winston-Salem Regional Office
Stormwater Permitting Unit
DWQ Central Files - w/attachments
Fran McPherson, DWQ Budget Office
Wetlands and stormwater Branch One
1617 Mail Service Center, Raleigh, North Carolina 27699-1617 North Carolina
Loeation: 512 N. Salisbury St. Raleigh, North Carolina 27604
Phone: 91M07-6300 l FAX: [phone] J1 �aturallr�
Internet. www.ncwaterqualiry.org
An Equal Opportunity i Affirmative Action Employe;

Mr. Adam Mathews
Temporary Concrete Batch Plant — Flatiron -Lane
NCG 140406
March 25, 2011
Engineer's Certification (000 No. NCG1.40406)
I -1_1g� �" vl�,l� as a duiY registered Professional Engineer in the
g g
State of North Carolina, having b
�OWl/k
en authorized to observe (periodically, weekly, full tune) the
construction of the project, - AC tYA-�''N�`'� �A�'4k`�_ O"'''' for the
Project Name ''`,e Locatio7l
Permittee hereby state that, to the best of my abilities, cille care 211d diligence was used in the
observation of the following installations:
Construction ofa process wastewater recycle system at the'Femporary Concrete Batch
Plant — Flatiron -Lane site.
I certify that the constl'llctlon of the above referenced project was observed to be built within
substantial compliance and intent of the approved plans and specifications.
Signature /" /ARegistration No,
Date_L
Mail this Certification to:
29@1ROYffm
OG 1 7 2011
DENR • WATER QUALIT1
WETLANDS AND sToRvwATER BF4N�F
Storrawater Permitting Unit
NC Division of Water Qual ity
1617 Mail Service Center
Raleigh, NC 27699-1617

Patterson, Robert
From: Carter, Jenifer
Sent: Friday, March 25, 2011 10:31 AM
To: Patterson, Robert
Subject: RE: NCG140406 - Flatiron Lane Temp. Batch Plant, Davidson Co.
Go ahead with the permit. I wish all of my batch plants in Davidson Co. were as well designed.
Before printing this email, please consider your budget and the environment.
If you must print, please print only what you need and save ink with the free Eco-Font.
NC DENR Winston-Salem Regional Office
Division of Water Quality
585 Waughtown Street
Winston-Salem, NC 27107
Voice: [phone]
FAX: [phone]
E-mail correspondence to and from this address may be subject to the
North Carolina Public Records Law and may be disclosed to third parties.
From: Patterson, Robert
Sent: Friday, March 25, 2011 10:12 AM
To: Carter, Jenifer
Subject: RE: NCG140406 - Flatiron Lane Temp. Batch Plant, Davidson Co.
Jenifer,
I finished my review and feel it is a pretty good design. Does WSRO have any concerns with issuing the COC?
Thanks
Robert 1). Patterson, PE
Environmental Engineer
NCI)I NR I I)WQ f Stormwater Pcrrnitting
1617 Mail Scrvicc Ccnter, Raleigh, NC 27699-1617 (Mail)
512 N. Salisbury St, Raleigh, NC 27604 1 9th Floor (l.oc.ition R, l'r3rr els)
[phone] Phony, j (919) 807-6,194 Fax I Robert.F'attcrsonrr.ncdc,�nr.gov Pnmil
Wehsilc: htt[2:(1por•tal.ncdenr.org/wcb/­wc/­ws/su
,.31 Before printing this email, please consider your budget and the environment.
E-mail correspondence to and from this address may be subject to the North Carolina Public Records Law and may be disclosed to third parties.
From: Carter, Jenifer
Sent: Wednesday, March 23, 2011 9:59 AM
To: Patterson, Robert
Subject: RE: NCG140406 - Flatiron Lane Temp. Batch Plant, Davidson Co.

Yes. These folks have set these temporary plants up many times for DOT projects, and have a good reputation according
to our resident DOT Wetland Specialist here (Amy Euliss), I don't think housekeeping would be a problem, but you could
mention it as a condition/justification in your response. That would give us some enforcement teeth should it become a
problem later.
Before printing this email, please consider your budget and the environment,
If you must print, please print only what you need and save ink with the free Eco-Font.
NC DENR Winston-Salem Regional Office
Division of Water Quality
585 Waughtown Street
Winston-Salem, NC 27107
Voice: [phone]
FAX: [phone]
E-mail correspondence to and from this address may be subject to the
North Carolina Public Records Law and may be disclosed to third parties.
From: Patterson, Robert
Sent: Tuesday, March 22, 2011 1:44 PM
To: Carter, Jenifer
Cc: Basinger, Corey
Subject: NCG140406 - Flatiron Lane Temp. Batch Plant, Davidson Co.
Jenifer,
I had forwarded a copy of the subject application package to Corey a few weeks ago for WSRO files. I wasn't aware at
the time that you were handling Davidson Co. I haven't finished my review yet, but I did get some additional full-size
plans. I just wanted to give you a heads up that I'm sending you a copy of these plans via interoffice mail.
The package looks pretty good so far. My only real concern is that the mobile batch plant unit area and the stockpiles
will bypass the pH adjustment basin and go straight to the stormwater basin. This is ok if they are going to have good
housekeeping, but not otherwise. Do you have any thoughts on that?
Thanks
Robert D. Patterson, PE
Environmental Engineer
NCDENR I DWQ I Stormwater Permitting
1617 Mail Service Center, Raleigh, NC 27699-1617 (Nlail}
512 N. Salisbury St, Raleigh, NC 27604 1 91h Floor (Locaiion & Parcels)
[phone] Phone [phone] Fax I Rober(.Patterso c ncdenr. ov E:niail
Wcbsitc: http://-i)ortal.nedenr,org/web/wa/ws/su
b# Before printing this email, please consider your budget and the environment.
E-mail correspondence to and from this address may be subject to the North Carolina Public Records lava and may be disclosed to third parties.

A
JJJ A�p
NCDENR
North Carolina Department of Environment and Natural Resources
Division of Water Quality
Beverly Eaves Perdue
Governor
Coleen H- Sullins
Director
Dee Freeman
Secretary
RECEIVED
N.C. Dept. of i
March 7, 2011 LIAR 0 S 2011
MNAw-SaWfn
Memorandum Reglonal OMlco
To: Ms. Lisa Edwards, Department of Environmental Health (DEH) - WSRO
From: Robert Patterson, Stormwater Permitting Unit
Subject: Review of the discharge location for the following:
Temporary Concrete Batch Plant — Flatiron -Lane
6089 Old Salisbury Road
Linwood, NC 27299
Davidson County
N C G 140406
MAR 1 1 2011 .
Please indicate your agency's position on the facility listed above. Attached is the application package
for this facility and our additional information request. We cannot issue the permit without your
concurrence. Please return this form at your earliest convenience.
RESPONSE:
This agency has reviewed the draft permit and determined that the proposed discharge will not
be sufficiently close to any existing or known proposed public water supply intake so as to
create an adverse effect on water quality. We concur with the issuance of this permit,
provided the facility is operated and maintained properly, the stated effluent limits are met prior
to discharge, and the discharge does not contravene the designated water quality standards.
Concurs with issuance of the above permit, provided the following conditions are met:
Opposes the issuance of the above permit, based on reasons stated below (or attached):
Signed Date: 3 `7
za
Attachments
cc: Stormwater Permitting Unit Files
1617 Mail Service Center, Raleigh, North Carolina 27699-1617 One
Location; 512 N. Salisbury St. Ralegh, North Carolina 27604 NorthCarolina
Phone; 91U07-63001 FAX: [phone]l Customer Service: 1-877-623.6748
Internet; www.newaterquality.erg ./ atupa"l/
An Equal Opportunity 4 Affirmative Action Employer f� i/

North Carolina
Beverly Eaves Perdue
Governor
Mr. Adam Mathews
Flatiron -Lane, A .Joint Venture
105 Jacobs Lambe Lane
Salisbury, NC 28146
Dear Mr. Mathews:
MCDENR
Department of Environment and Natural Resources
Division of Water Quality
Coleen H. Sullins
Director
March 25, 2011
Subject: General Permit No. NCG 140000
Temporary Concrete Batch Plant
COC No. NCC 140406
Davidson County
Dee Freeman
Secretary
In accordance with your application for a discharge permit received on February 23,
2011. we are forwarding herewith the subject certificate of coverage (COC) to discharge under
the subject state — NPDf S general permit. This permit is issued pursuant to the requirements of
North Carolina General Statute 143-215.1 and the Memorandum of Agreement between North
Carolina and the US Environmental Protection Agency dated October 15, 2007 (or as
subsequently amended).
Please take notice that this certificate of coverage is not transferable except after notice to
the Division of Water Quality. The Division of' Water Quality may require modification or
revocation and reissuance of the certificate of coverage. This permit does not affect the legal
requirements to obtain other permits which may be required by the Division of Water Quality or
permits required by the Division of Land Resources, Coastal Area Management Act or any other
federal or local governmental permit that may be required.
An Authorization to Construct treatment facilities has been issued concurrently with
this COC. The Winston-Salem Regional Office, telephone numher [phone], shall be
notified at least forty-eight (48) hours in advance of operation of the installed I-acilities so that in
in -place inspection can be made. Such notification to the regional supervisor shall be made
during the normal office hours from 8:00 a.m. until 5:00 p.m. on Monday through Friday,
excluding State Holidays.
Upon completion of construction and prior to operation of this permitted facility, a
certification must be received from a professional engineer certifying that the permitted
facility has been installed in accordance with the NPDES Permit, the associated
Authorization to Construct, and the approved plans and specifications. Please mail the
Wetlands and Slormwaler Branch One
1617 Mail Service Center, Raleigh, North Carolina 27699-1617 NorrhCarol i na
Location: 512 7Salisbury300FSt. 1-80Raleigh, Nor h Carolina 27604 Naturally
Phone: 919-8D7-630D 1 FAX: [phone] Customer Service: 1-677-623-6748
Internet: www.ncwaterquality.org
An Equal Opportuniiy 1 Affirmative Action Employer

Mr. Adam Mathews
Temporary Concrete Batch Plant — Flatiron -Lane
NCG 140406
March 25, 2011
certification (attached) to the Stormwater Permitting Unit, 1617 Mail Service Center, Raleigh,
NC 27699-1617.
Please note that any future construction, installation, or modification of wastewater
treatment facilities (including process wastewater recycle systems) will require an Authorization
to Construct (ATC) prior to construction per 15A NCAC 2H .0138 & .0139. You must submit,
in triplicate, plans/specifications and design calculations, stamped and sealed by a professional
engineer, with a letter requesting an ATC to the Stormwater Permitting Unit, 1617 Mail Service
Center, Raleigh, NC 27699-1617.1
One (1) set of approved plans and specifications is being forwarded to you. The
Permittee shall maintain a copy of the approved plans and specifications on file for the life of the
facility. If you have any questions concerning this permit or Authorization to Construct, please
contact Robert Patterson at telephone number [phone].
Sincerelyy
ORIGINAL SIGNEd Bl
KEN PICKLE
,fc)r Coleen 1-1. Sullins
CC' Winston-Salem Regional Office — Jeni fer Carter
Central Files
Stormwater Permitting Unit Files
enclosure

Mr. Adam Mathews
"Temporary Concrete Batch Plant — flatiron -Lane
NC(; 140406
March 25, 2011
Engineer's Certification (COC No. NCG14040Q
1, , as a drily registered Professional I ngitieer in the
State of North Carolina, having beets authorized to observe (periodically, weekly, full tithe) the
Construction of the project, , for the
Project Alame LocallOn
Perniittee hereby state that, to the hest of illy abilities, due care and diligence was used in the
Observation of the following installations:
• Construction of a process wastewater recycle system at the Temporary Concrete Batch
Plant — I' latiron-L,ane site.
I certify that the construction of the above referenced project was observed to be built within
substantial compliance and intent of the approved plans and specifications.
Signature
Date
Registration No.
Mail this Certification to: Stornnvater Permitting Unit
NC Division of Vater Quality
1617 iNlail Service Center
Raleigh, NC 27699-1617

STATE OF NORTH CAROLINA
DEPARTMENT OF ENVIRONMENT AND NATURAL RESOURCES
DIVISION OF WATER QUALITY
GENERAL PERMIT NO. NCG140000
CERTIFICATE OF COVERAGE No. NCG140406
STORMWATER AND PROCESS WASTEWATER DISCHARGES
NATIONAL POLLUTANT DISCHARGE ELIMINATION SYSTEM
In compliance with the provision of North Carolina General Statute 143-215.1, other lawful
standards and regulations promulgated and adopted by the North Carolina Environmental
Management Commission, and the Federal Water Pollution, Control Act, as amended,
Flatiron -Lane, A Joint Venture
is hereby authorized to discharge stormwater and to construct and operate a process wastewater
treatment system, and is hereby authorized to discharge process wastewater from a facility
located at
Temporary Concrete Batch Plant -- Flatiron -Lane
6089 Old Salisbury Road
Linwood
Davidson County
to receiving waters designated as an UT to Yadkin River, a class WS-V water in the Yadkin —
Pee Dee River Basin, in accordance with the effluent limitations, monitoring requirements, and
other conditions set forth in Parts I,11, III, IV, V, and VI of General Permit No. NCG140000 as
attached.
This certificate of coverage shall become effective March 25, 2011.
This Certificate of Coverage shall remain in effect for the duration of the General Permit.
Signed this 25th day of March, 2011,
ORIGINAL SIGNED Bl
KEN PICKLE
for Coleen H. Sullins, Director
Division of Water Quality
By the Authority of the Environmental Management Commission

NCG140406
Map Scale 1: 24, 000
Flatiron -lane, A Joint Venture
Temp. Concrete Batch Plant - Flatiron -Lane
Latitude: 35144' 08" N
Longitude: 80° 22' 21" W
County: Davidson
Receiving Stream: UT to Yadkin River
Index No.: 12-(108.5)
Stream Class: WS-V
Sub -basin: 03-07-04 (Yadkin Pee -Dee River Basin)
Facility Location

.�UCG 14t O 4f d C
THE
LANE
Build the Best. Be the Best FLATIRON Win«
February 21", 2011
Stormwater Permitting Unit
Division of Water Quality
1617 Mail Service Center
Raleigh, NC 27699-1617
Reference: North Carolina Department of Transportation
Contract No. C202383
1-85 Yadkin River Bridge Replacement & Interstate Reconstruction
NCG 140000 Permit Application
Gentlemen,
Flatiron -Lane, JV
Yadkin River Bridge
105 Jacobs Lambe Lane
Sa#isbury. NC 28146
704.637,2366 MAIN
704.637.2364 FAX
www.flatironcorp.com
Letter No. NCDENR-002
❑CN:S00755
Attached you will find our application package, in triplicate, for an NPDES Discharge Permit for a temporary
portable central mix concrete batch plant. This proposed facility will be located at 9089 Old Salisbury Road
in Linwood, NC and would be used solely to provide concrete for the above referenced NCDOT interstate
reconstruction project.
Enclosed in our application package you will find the necessary forms, plans, design calculations and
specifications. You will also find included a check in the amount of $100.00 for the application fee.
I trust that you will find our application package complete, and due to the fast track nature of this project it is
requested that this application be expedited. Should you have any questions please feel free to contact our
engineer, Casey Hurley, directly at 919-279-7264.
If I may be of any service to you please contact this field office at 704-637-2366.
Sincerely,
FLATIRON - LANE, JV
Adam Mathews
Project Manager
19@190 1J L5
FEB 2 3 2011
cc: CPH, CL, MG, SD, JB, DC
An Epual Oppor?unlly Employer

•
.7
Te • Division of Water Quality / Surface Water Protection
�rr�®
NCDENRNational Pollutant Discharge Elimination System
tr.�ow-wn mo N-n^w fi[s Es
NCG 140000
NOTICE OF INTENT
FOR AGENCY USE ONLY
Date Received
Year
Month
nay
Certificate o€Covera e
Check # Anu.unt
Permit Assi vned to
National Pollutant Discharge Elimination System application for coverage under General Permit
NCG140000:
STORMWATER AND PROCESS WASTEWATER DISCHARGES associated with activities classified as:
SIC (Standard Industrial Classification) Code - 3273 Ready Mixed Concrete
For new plant sites that will discharge or recycle process wastewater (even if commingled with
stormwater): This NOl is also an APPLICATION FOR Authorization to Construct (ATC) wastewater
treatment facilities. ATC requests must be submitted at least 90 days prior to construction'.
For existing plant sites discharging or recycling process wastewater (even if commingled with
stormwater): This NOI is also an APPLICATION FOR Authorization to continue to operate wastewater
treatment facilities in place. Construction, modification, or installation of any new treatment components
at an existing site requires an ATC.
Treatment facilities used to treat or recycle process wastewater (including stormwater l3MP structures
treating process wastewater flows commingled with storniwater) require an ATC prior to construction
per 15A NCAC 2H .0138. The authorization to construct or continue to operate will be issued at the
same time as the Certificate of Coverage (COC) for the NCG14 permit. Design of treatment facilities
must comply with requirements of 15A NCAC 2H .0138 & .0139.
Construction of wastewater treatment facilities (this includes recycle systems) at new or existing plant
sites requires submission of three (3) sets of plans and specifications signed and sealed by a
Professional Engineer (P.E.) or qualified staff along with this application. A copy of the design
calculations should be included. Please see questions 14 & 15.
10�~u For questions, please contact the DWQ Regional Office for your area. (Seepage 5)
•
(Please print or type)
1) Mailing address of owner/operator (address to which all permit correspondence will be mailed):
Name Flatiron -Lane, A Joint. Venture
Street Address 105 Jacobs Lambe Lane
City Salisbury StateNC ZIP Code 28146
Telephone No. 704 637 - 2366 Fax: 704 637 - 2364
2) Location of facility producing discharge:
Facility Name
Facility Contact
Street Address
City
County
Temoorary Concrete Batch Plant — Flatiron -Lane
Casey P. Hurley, PE
6089 Old Salisbury Road
Linwood State
Davidson
NC_ ZIP Code 27299
Page 1 of 5
'As per 15A NCAC 2H .0106
2Unless treatment facilities are designed, constructed, and put into operation by employees internal to the company who are qualified to
perform such work for their respective companies in accordance with General Statutes, 89C-25 (7), plans and specifications must be signed
and sealed by a P.E.
S W U-229-071408
Last revised 7114/08

NCG140000 N.O.I.
Telephone No. 919 _ 279 - 7264 Fax: 704_ 637 -2364
3) Physical location information:
Please provide a narrative description of how to get to the facility (use street names, state road numbers, and
distance and direction from a roadway intersection). Take 1-85 to Exit 81, Clark Road. Turn West onto
Clark and immediately turn Left onto Old Salisbury Road. The turn for the Plant will be approx. 1 mile
on the left. See attached location map.
(A copy of a county map or USGS quad sheet with facility clearly located on the map is a required part of this application.)
4) Latitude 35 44 7.88 Longitude -80 22 20.81 (deg, min, sec)
5) This NPDES Permit Application applies to which of the following:
X New or Proposed Facility Date operation is to begin 6-1-2011
❑ Existing
6) Standard Industrial Classification:
Provide the 4 digit Standard Industrial Classification Code (SIC Code) that describes the primary industrial
activity at this facility
SIC Code: 3 2 7 3
7) Provide a brief description of the types of industrial activities and products produced at this facility:
(Include a site diagram showing the process areas present at this facility.)
This is a Temporary Portable Central Mix Batch Plant which will be used to produce concrete for the NCDOT
reconstruction project of 1-85, See site diagram additional information. „
8) Discharge points / Receiving waters:
• How many discharge points (ditches, pipes, channels, etc.) convey stormwater and/or wastewater from the
property? One
What is the name of the body or bodies of water (creek, stream, river, lake, etc.) that the facility stormwater
and/or wastewater discharges end up in? Unknown Tributary to the Yadkin River
If the site stormwater discharges to a separate storm sewer system, name the operator of the separate storm
sewer system (e.g. City of Raleigh municipal storm sewer). NIA
Receiving water classification (if known): NIA
Note: Discharge of process wastewater to receiving waters classified as WS-11 to WS-V or SA must
be approved by the N.C. Dept. of Environmental Health. If DEH does not approve, coverage
under NCG140000 cannot be granted. No new discharges of process wastewater are
permitted in receiving waters classified as WS-I or freshwater ORW.
9) Does this facility have any other NPDES permits?
X No
❑ Yes
If yes, list the permit numbers for all current NPDES permits for this facility:
10) Does this facility have any Non -Discharge permits (ex: recycle permits)?
X No
❑ Yes
If yes, list the permit numbers for all current Non -Discharge permits for this facility:
11) Does this facility employ any best management practices for stormwater control?
• ❑ No
X Yes
If yes, please briefly describe: As detailed in the Treatment Plan this site will utilize multiple BMP's. Including
Page 2 of 5
SWU-229-071408 Last revised 7/14/2008

NCG140000 N.O.I.
•
Installed BMP Structures for Erosion Control. Stormwaler & Wastewater Management. In addition to installed
Structures regular NPDES inspections will be completed.
12) Does this facility have a Stormwater Pollution Prevention Plan?
❑ No
X Yes
If yes, when was it implemented? It will be implemented upon approval of this application.
13) Are vehicle maintenance activities occurring or planned at this facility?
X No
❑ Yes
Wastewater Treatment Design Information
14) Are discharges occurring or planned from any of the following process wastewater generating activities?
Vehicle and equipment cleaning X Yes ❑ No
Wetting of raw material stockpiles X Yes ❑ No
Mixing drum cleaning X Yes ❑ No
If yes to any of the above, please describe the type of process used to treat andlor recycle the process
wastewater.
f For a sufficient application, you must provide design specifics (e.g., design volume, retention time, surface
area, etc.) and calculations to demonstrate compliance with permit effluent limits (pH — 6-9 SU, Total
Suspended Solids (TSS) — 30 mgll, and Settleable Solids (SS) — 5 ml/l.) [Use separate sheet(s)].
If all these discharges are recycled, please refer to Question 15.
For plants that recycle and/or discharge process wastewater:
When applying for this permit, you are also applying for an authorization to construct (new
treatment facilities) or authorization to continue to operate (existing treatment facilities) as
part of the NOI. For new sitesyou must submit three (3) sets of design plans and
specifications with this application and provide supporting calculations that predict
compliance of final discharge with permit limits. For existing sites, applicants should submit
three (3) sets of plans and specs for facilities as -built and provide as many design details as
possible, or submit a detailed diagram of treatment systems in place that includes information
such as tank volumes, dimensions, retention time, piping, settling basin details, etc.
Please note: If new treatment systems are planned for an existing site, an ATC will be required
prior to construction of those facilities. Plans/specs/calculations prepared by a P.E. and the
request for an ATC may be submitted with this NOI, or separately at a later date. DWQ may
request the status of your plans for requesting an ATC upon issuance of the COC.
15) Does the facility use or plan to use a recycle system?
X No
❑ Yes
If yes, what size storm event is the system designed to hold before overflowing? (for example, 10-yr, 24-hr)
NIA year, 24-hr rainfall event
For a recycle system (regardless of when it overflows), please provide plans, calculations, and design
specifics (e.g., throughput assumptions/water balance, design volume, retention time, surface area. amount of
freeboard in design storm event, etc.). [Use separate sheet(s)].
WFor a sufficient application, the information must demonstrate compliance of final discharge with permit
effluent limits (pH — 6-9 SU, Total Suspended Solids (TSS) — 30 mgll, and Settleable Solids (SS) — 5 mlli), or
S W U-229-071408
Page 3 of 5
Last revised 7f1412008

NCG140000 N.O.I.
must demonstrate that the recycle system has sufficient capacity to contain runoff from a 25-year, 24-hr
• rainfall event plus one foot of freeboard under design operating conditions.
16) Are wastewater treatment facilities (including recycle systems) planned in the 100-year flood plain?
X No ❑ Yes If so, include information to demonstrate protection from flooding. (Minimum design
requirements for treatment works include protection from the 100-year flood, per 15A NCAC 2H .0219.)
17) Hazardous Waste:
a) Is this facility a Hazardous Waste Treatment, Storage, or Disposal Facility?
X No
❑ Yes
b) Is this facility a Small Quantity Generator (less than 1000 kg. of hazardous waste generated per month) of
hazardous waste?
X No
O Yes
c) Is this facility a Large Quantity Generator (1000 kg. or more of hazardous waste generated per month) of
hazardous waste?
X No
❑ Yes
d) If you answered yes to questions b. or c,, please provide the following information;
Type(s) of waste:
How is material stored:
0 Where is material stored:
How many disposal shipments per year:
Name of transport 1 disposal vendor: _
Vendor address:
18) Certification:
•
North Carolina General Statute 143-215.6 B(i) provides that:
Any person who knowingly makes any false statement, representation, or certification in any application, record, report, plan, or other
document filed or required to be maintained under this Article or a rule implementing this Article; or who knowingly makes a false
statement of a material fact in a rulemaking proceeding or contested case under this Article; or who falsifies, tampers with, or knowingly
renders inaccurate any recording or monitoring device or method required to be operated or maintained under this Article or rules of the
[Environmental Management] Commission implementing this Article shall be guilty of a Class 2 misdemeanor which may include a fine
not to exceed ten thousand dollars ($10,000).
I hereby request coverage under the referenced General Permit. I understand that coverage under this permit
will constitute the permit requirements for the discharges) and is enforceable in the same manner as an
individual permit.
I certify that I am familiar with the information contained in this application and that to the best of my
knowledge and belief such information is true, complete, and accurate.
Printed Name of Person Signing: Adam Mathews
Title: Proiect Manager
(Signature of Applicant)
ed)
Page 4 of 5
SWU-229-071408 Last revised 7/14/2008

NCG140000 N.O.I.
Notice of Intent must be accompanied by a check or money order for $100.00 made payable to:
• NCDENR
Final Checklist
This application will be returned as incomplete unless all of the following items have been included:
❑ Check for $100 made payable to NCDENR.
❑ This completed application and all supporting documentation (including design details and calculations for
treatment systems).
❑ If an Erosion & Sedimentation Control (E&SC) Plan is required from Division of Land Resources (DLR)
or local designee: documentation verifying applicant has developed and submitted that Plan to the governing
agency (required per 15A NCAC 02H .0138).
❑ For new sites (or sites that will install new treatment facilities): Three (3) copies of plans and
specifications for wastewater treatment facilities (including recycle systems), signed and sealed by a
Professional Engineer or qualified staff meeting requirements of G.S. 89C-25 (7).
WA ❑ For existing sites: three (3) copies of plans and specifications for wastewater treatment facilities (including
TV recycle systems) as built, stamped and sealed by a Professional Engineer, or (only if plans not available) a
detailed diagram of treatment systems in place that includes information such as tank volumes, dimensions,
retention time, piping, settling basin details, etc.
❑ A site map showing, at a minimum, (existing or proposed):
(a) outline of drainage areas, (b) storm waterlwastewater treatment structures, (c) location of
stormwaterlwastewater outfalls (corresponding to which drainage areas), (d) runoff conveyance structures,
(e) areas where materials are stored, (f) impervious areas, and (g) site property lines.
❑ A county map or USGS quad sheet with location of facility clearly marked.
E
•
Mail the entire package to:
Stormwater Permitting Unit
Division of Water Quality
1617 Mail Service Center
Raleigh, North Carolina 27699-1617
Note
The submission of this document does not guarantee the issuance of an NPDES permit.
For questions, please contact the DWQ Regional Office for your area.
DWQ Regional Office Contact Information:
Asheville Office ......
[phone]
Fayetteville Office ...
[phone]
Mooresville Office ...
[phone]
Raleigh Office ........
[phone]
Washington Office ...(252)
946-6481
Wilmington Office ...
[phone]
Winston-Salem ......
[phone]
Central Office .........(919)
807-6300
S W U-229-071408
Page 5 of 5
Last revised 7/1412008

THE
LANE
FLATIRON =T011.10b
• Application Package for:
NPDES Permit to Discharge Stormwater
Processed Wastewater for Ready Mix Concrete Plants
Objective:
Flatiron -Lane has been awarded the NCDOT contract to replace the 1-85 Bridge over the Yadkin River
and reconstruct 3 miles of the interstate highway. It is the intention of Flatiron -Lane to erect and
operate a portable temporary concrete central mix batch plant to provide concrete solely for this
project. Being that this project is extremely fast track in nature the concrete plant that is being
presented in this application will have a very short operational duration. Upon completion of this
project in January 2013, this batch plant will have been removed and the site will have been restored.
Project: Reconstruction of 1-85
Owner: North Carolina Department of Transportation
City: Linwood, NC
County: Davidson
Physical Address: 9089 Old Salisbury Road, Linwood, NC 27299
Mailing Address: 105 Jacobs Lambe Lane, Salisbury, NC 28146
Prime Contact:
Casey P. Hurley, PE
Project Engineer
Flatiron -Lane
(919) 279 — 7264
[e-mail]
State Authority:
North Carolina Department of Environment and Natural Resources
Division of Water Quality
1617 Mail Service Center
Raleigh, NC 27699-1617
Local Jurisdiction:
Davidson County Planning and Zoning
913 Greensboro Street
Lexington, NC 27292

•
•
Johnson -Ross "Uni-Raver" Model 1248
NCDOT Project: Reconstruction of Interstate 1-77 through Yadkin County (C201269)
Picture Location: Hamptonville, NC (Yadkin County)
Picture Taken: December 2007
Johnson -Ross "Uni-Raver" Model 1248
NCDOT Project: Reconstruction of Interstate 1-77 through Yadkin County (C201269)
Picture Location: Hamptonville, NC (Yadkin County)
Picture Taken: December 2007

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THE
.I.AA& LANE
FLATIRON coaeo Aiio°N
• Stormwater Pollution Prevention Plan
For
Flatiron-Lane's Temporary Concrete Batch Plant
Background
The Flatiron -Lane Joint Venture construction company has been awarded the NCDOT contract to
reconstruct the 1-85 Yadkin River Bridge and 3 miles of interstate pavement. This project requires that
approximately 100,000 cubic yards of concrete be produced and placed into the new roadway. In order
to facilitate this construction, a temporary portable concrete batch plant will be constructed an a private
parcel of land that has been leased by Flatiron -Lane. The physical address of this location is 9089 Old
Salisbury Road, Linwood NC 27299.
The concrete plant that is being proposed in this application will exist solely to provide concrete for the
1-85 reconstruction project. As scheduled this entire project will be completed by January 2013 and the
concrete plant will be removed in advance of this date. It is anticipated that this plant will only be in
existence for 18 months and during that time it will only be active during intervals of concrete paving.
Upon the completion of concrete paving this plant will be removed and the site will be restored.
Waste Water Generated
There will be four different types of waste water generated at this site which need to be analyzed.
• The first will come from the cleaning of the concrete hauling units. Dump trucks will be utilized to haul
the wet concrete and will need to have their dump bodies rinsed out after each load. This water will
combine with the concrete that is rinsed out of the dump body and will contain all the elements of the
concrete (Sand, Stone & Cement). No other cleaning or repair of these vehicles will occur at this site.
The second waste water generated will be the wash water produced after cleaning the plant's mixing
drum. The composition of this water will be the same as that produced during the dump truck rinsing
operation. This cleaning of the mixing drum will occur upon of the completion of each shift and also as
necessary throughout the shift.
The third wastewater generated will be the water used to wet the raw aggregate stockpiles. These
stockpiles will be watered consistently during concrete production operations. Water that flows from
these stockpiles will contain suspended fine particles that have escaped from the stockpiles.
The final wastewater generated at this site is storm water runoff. Currently the site is a grassed field
which will need to be stabilized prior to the concrete plant being setup. Once the area is stabilized the
amount of runoff becomes much greater and has the potential to create erosion.
Waste Water Control & Treatment
In order to effectively treat the waste water generated by this setup it must first be collected and
brought into the appropriate containment areas. As designed the treatment plan for this site will
separate storm water runoff from concrete wash water. The site will be graded and diversion ditch
• lines will be established to ensure that storm water will flow into the southernmost basin while the

THE
./OA& LANE
STRUCTUN
FLATIRON COPPORATON
• concrete wash water will be introduced into its own series of basins. This separation will allow for a
higher total system factor of safety.
The Stormwater Basin will be a "Skimmer" basin which is a BMP device designed to retain the flow from
a storm event and slowly dewater by skimming the surface water. This basin is 100% effective in
retaining all large particles that may be suspended in the storm water runoff. It is anticipated that any
particles originating from the plant yard itself will be relatively large (Fine Sands) and easily collected in
this basin. The remainder of the drainage area at this plant site is a grassed field which could introduce
silts and clays into the runoff. Any silt particles will easily settle out in this skimmer basin. However,
due to the ultra -fine particle size of clays if introduced into the system these particles could potentially
pass through prior to settling out. Settling time is not realistically achievable for ultra -fine particles
such as clays and as such the best treatment method for these particles is to prevent their introduction
into the system. This prevention is most easily achieved by confirming the adequacy of the established
ground cover. Any disturbed soil must be vegetated to eliminate exposed erodible surfaces. Rock
"Check Dams" will also be utilized to slow the storm water as it flows toward the skimmer basin which
will also help to reduce the potential risk of erosion.
The Concrete Wash Water will be introduced into its own series of basins designed to effectively settle
all suspended particles and also to ensure that the pH of the outflowing water is within the acceptable
range. To do this, three basins will be created. The first basin in the series is the "Washout Pit" where
the dump trucks will be sprayed and the concrete will be directly mixed into the system. This is also
the location where wash water from the mixing drum will be transported to. The second basin is to be
• the "Settling Basin" which is a very large retention basin sized to provide adequate settling time to
ensure that the fine particles have settled out prior to outflowing into the final basin. The third basin is
the "pH Reduction Basin" which is where a Fortran System will be installed to monitor and regulate the
PH of the wash water.
Predicted Maximums and System Performance
The storm water treatment system has been designed for the Ten Year rain event following the NC
Division of Land Quality Requirements. For the total accumulated drainage areas for this site (1.9 AC
plant site and 3.15 AC grassed field) the expected flow rate from this storm event would be 22.3 CFS.
The concrete wash water treatment system has been designed for a concrete plant running at a regular
maximum production of 2,000 CY per day. This volume will result in a wash water flow of
approximately 2500 CF/D. In actuality this production rate will only be achieved a limited number of
times on this project. However, it is important to calculate the waste water treatment system based
upon the project maximums and not the averages.
Upon release from either treatment system (Storm or Wash) the TSS and SS levels in the outflowing
water will be less than the established limits (30 mg/I and 5 ml/I respectively), and the pH will be within
the acceptable 6-9 range.
Maintenance of System
All water treatment devices will be evaluated on a bi-weekly basis, and after any event resulting in 0.S"
of precipitation or greater. Any damage to the devices will be repaired immediately and any sediment
that has been built up will be removed routinely. This system has been designed to allow for easy
access and maintenance which will help to ensure that it functions property.

THE
LANE
FLATIRON E�R,�
J
During intervals where the concrete plant is active the wash water basins will be inspected on a daily
basis. It is anticipated that at a minimum the' Washout Pit" will require routine cleaning during these
intervals. The aggregates that will accumulate in this basin will begin to impact the function of the
system if they are allowed to build up. It is the responsibility of Flatiron -Lane to ensure that this
buildup of materials is removed on a timely basis.
Summary
The purpose of this treatment system is to effectively treat both the Stormwater and the Wastewaters
produced from this concrete plant site. This treatment system has been used successfully at previous
sites for concrete batch plants, most recently this exact plant and treatment methodology was used for
a similar NCDOT project in Yadkin County (Lane Construction, 2007). The rules and guidelines set forth
by general permit NCG 140000 will be strictly adhered to and BMP's will be employed. Any questions
regarding the operation of this facility can be directed to the facility contact noted in the application.
•
0

PROJECT: 1-2304 AC
•DESCRIPTION: Yadkin River Bridge Replacement & Reconstruction of 1-85
SUBJECT / TASK: Calculate Stormwater Runoff from Concrete Plant Site & Design Treatment System
CALCULATED BY: CPH
DATE: 2/11/2011
•
Objective:
Flatiron -Lane has proposed to construct and operate a temporary portable concrete
batch plant to facilitate the construction of the above referenced project. Given the provided
layout for this plant site, it is necessary to design and size a stormwater management system.
As detailed on the plan sheet, this system will utilize diversions to channel runoff and
sediment basins to contain & treat that runoff.
Calculate Time of Concentration (tJ tr = [L3/H]'-"5/128 (Malcom)
L = 450 Ft. Hydraulic length of watershed
H = 20 Ft. Elevation change along length
tr = 2.9 Minutes Minimum tc = 5 minutes
t, (min) = 5.0 Minutes Use Minimum tc:
Calculate Peak Flow Rate ( Q) Q =CiA
Impervious Plant Yard & Driveways
C = 09 *Rational Coefficient -Table 1.6 NCDOT Design Manual
i = 6.$ in/hr *Rainfall Intensity - Appendix A NCDOT Design Manual
Greensboro 10yr, 5-Minute Storm
A = 1.9 AC Drainage Area, Impervious
Q Imp = 11.628 CFS
Pervious Surrounding Grassed Areas
C = 0.5 *Rational Coefficient - Table 1.6 NCDOT Design Manual
*Rainfall Intensity - Appendix A NCDOT Design Manual
i = 6.8 in/hr Greensboro 10yr, 5-Minute Storm
A = 3.15 AC Drainage Area, Pervious
Q P"= 10.71 CFS
Q10 Total = 22.338 CPS
Drainage Area = 5.05 AC Select Skimmer Basin
*(NCDOT BMP Selection & Design Criteria Chart)
Page 1 of 5

•
411
0
Calculate Basin uesign minimums
Storage Volume =
1800 CF/AC *NCDQT Guidelines
Min. Capacity =
9090 CF
Surface Area =
325Q10 SF *NCDQT Guidelines
Min. Surface Area =
7259.85 SF
elected BMP Basin
Top Dimensions * Bottom Dimensions
Length: 150 Ft Length: 138
Width: 50 Ft Width: 38
Depth: 3 Ft (At Weir) * Skimmer Requires Minimum 3:1 L:W Ratio
Side Slopes: 2 :1 (H:V)
SURFACE AREA = 7500 SF Basin Size is: Good
RETENTION VOLUME = 19044 Basin Volume is: Good
TER BASIN
Depth to Dewater 2 FT
Volume to Dewater: 12,696 CF
Basin to Dewater in: 3 Days * NCDOT Guidelines
Outflow = 4232 CF/Day
r SKIMMER
Skimmer Size = 2.5 Inch * Faircloth Skimmer Selection Chart
H = 0.208
RIFICE
D = 2.00 Inch D = SQRT(Q/(2310SQRT(H)))
R = 1.00 Inch
7 BARREL SIZE
Clbarrei = 21.98 GPM
4" Barrel will Suffice * Figure C-1 (NCDOT Manual)
Page 2of5

EMERGENCY SPILLWAY
Spillway Width: 42 Ft
Confirm Suitability with
25.27 FT
Weir Equation:
COMPLETED STORMWATER BASIN DESIGN
Basin Size:
Basin Drainage Area:
Skimmer Size:
Orifice Radius:
Outflow Barrel:
Spillway Width:
E,
* NCDOT Method (Basin Width - 8')
150Ft x 50Ft x 3Ft
5.05 AC
2.S IN
1.00 IN
4 IN
42 FT
GOOD
Page 3 of 5

•
0
CONFIRM RETENTION TIME FOR SETTLING PURPOSES
This skimmer basin is designed for the 10 Year - 5 Minute Storm. Any storm Intensity beyond
this design event could overwhelm the system. However, such inflow would still be treated by
this basin. All storm water will be channeled into the basin and be forced to flow its entire
length. Water escaping the system via the emergency spillway will be free of any large
suspended particles, and depending upon time spent in the basin the majority of the suspended
fines should also settle.
For suitability purposes only the smallest particles from each of the Drainage Areas will be
analyzed. From the plant yard it is anticipated that "Very Fine" sands lost from the aggregate
stockpiles would be the smallest suspended particles introduced into the stormwater basin.
Then, from the grassed field the smallest particles would be expected to be silts & clays eroded
from any exposed surfaces.
bmaiiest Particles Suspenaea in btorm water
Drainage Area: Smallest Avg. Particle Diameter Avg. Particle Diameter
Particle (Microns) (Ft)
Plant Yard "very Fine Sand" 50 1.64E-04
Grass Field "Silts" 30 9.84E-05
"Avg. to Lg. Clays" 2 6.56E-06
Settling Time Calculations
Very Fine Sand
Silts
Avg. to Large Clays
tttectiveness of Svstem
5.04E-03 ft/sec V=gd2(pl-p2)/18µ *
1.09E-03 ft/sec Used a Typical Density for each type of
4.84E-06 ft/set Particle
Settling Time Achieved by Basin: 3 Days * * Skimmer Designed to Dewater
Depth of Basin 2 Ft * top 2' in 3 Days
Percentage of "Fine Sands" Settled Out: 100.00 %
Percentage of Silts Settled Out: 100.00 %
Percentage of Avg. to Large Clays Settled Out: 62.75 %
Page 4 of 5

•
•
0
Conclusions
This system is adequate to suspend any particles lost from the plant yard itself. However,
there could be some particles from the Grass Field that may not be able to adequately settle out
prior to being released from the system. Since Clays are so small they require extremely
long retention times in order to completely settle, which are not feasible to reach during storm
events.
The only way to ensure that the amount of suspended clays flowing out of the system is within
a tolerable level is to prevent their introduction to the system. It is recommended that ground
cover is provided anywhere there are exposed & erodible soils. It is also beneficial to slow all
flowing water with rock check dams so that erosion does not occur in ditchlines.
The combination of this Skimmer Basin and the BMP's discussed above will produce an effective
stormwater treatment system.
Page 5 of 5

•
•
PROJECT: 1-2304 AC
DESCRIPTION: Yadkin River Bridge Replacement & Reconstruction of 1-85
SUBJECT / TASK: Calculate "Wash Water" Volume from Concrete Plant Operations & Design Treatment System
CALCULATED BY: CPH
DATE: 2/11/2011
Objective:
Flatiron -Lane has proposed to construct and operate a temporary portable concrete
batch plant to facilitate the construction of the above referenced project. Given the provided
technical information regarding concrete plant operations, specific to this plant and project,
the volume of "Wash Water" needs to be calculated and a treatment system needs to be
designed.
Wash Water:
There are two sources of "Wash Water." The first being the water used to wash out the beds
of the wet batch hauling concrete dump trucks after each load. This operation is completed
by spraying the truck bed with a fire hose. The wash water then flows from the truck bed into
the washout pit. Once the washout pit fills, washwater will be skimmed from the surface with a
pump and reused to spray out truck beds. (This is done as a water conservation effort.)
The second source of wash water is the water that is used to clean the plant's mixing drum upon
completion of each shift and as needed throughout the shift. This operation is completed by
spraying the drum, letting it mix then dumping the wash water into a loader bucket for
transport to the washout pit.
TRUCK CLEANING WASH WATER
Estimated Maximum Concrete
2000
Cy
Production per Day:
Average Load Size:
10
CY
Number of Loads:
200
EA
Time Spent Cleaning Truck Bed per Load:
70
Seconds*
Typical Fire hose flow Rate for this
100
GPM
plant setup:
Total Wash Water Needed Per Shift:
23,333
Gallons
Fresh Wash Water Introduced to System:
17,500
Gallons * ( 75% Fresh Water )
Wash Water "Recycled" from Wash Pit:
5,833
Gallons * { 25% Recycled Water )
Truck Cleaning Wash Water
introduced to System per Day:
2,339
ft3
DRUM CLEANING WASH WATER
Estimated Cleaning Cycles per Shift:
3
EA
Amount of Water Used per Cycle:
350
Gal
Total Wash Water Produced:
1,050
Gallons
Drum Cleaning Wash Water
introduced to System per Day:
140
ft3
TOTAL WASH WATER INTRDUCED per Day:
2,480
ft3
( * Denotes Information Provided by Lane Construction, based on project projections and past measure
Page 1 of 8

•
•
0
Calculate Composition Wash Water
Estimate Amount of Waste Concrete
Volume of Waste Concrete Washed
out of Haul Trucks (Per Each):
Volume of Waste Concrete Washed
out of Mixing Drum (Per Each):
Total Waste Concrete Dumped
into Washout Pit per Day:
Typical Mix Design for this Plant Setup: *
100 Lbs. * * Provided by Lane Construction,
based upon past measurements
and recent experience in North
125 Lbs. * Carolina.
20,375 Lbs.
Cement:
14%
* Provided by Lane
Fine Agg:
29%
Construction, based upon
Course Agg:
49%
recent History in North
Water:
8%
Carolina.
Amounts of Waste Materials Introduced into Wash Water
Cement 2,771 Lbs.
Fine Agg: 5,909 Lbs.
Course Agg: 9,984 Lbs.
Water: 1711.5 Lbs. = 205 Gal
Page 2 of 8

•
•
5etuD ana uetati of i reatment
The Wash Water will contain waste concrete and as such there will be Suspended Solids.
Concrete is a mixture of Course Aggregate (Stone), Fine Aggregate (Sand), Cement
and Water. The aggregates will settle out of the wash water almost instantly and be
deposited at the base of the system. However, the cement will require a much greater
settling time due to its average particle size being quite small. It is this cement particle that
this water treatment system is designed for.
As detailed on the plan sheet, this system will employ three basins which will work in series.
The first basin is the "Washout Pit" which is where all the aggregates will settle out of the
wash water, leaving only the cement particles to flow into basin 2 which is the "Settling Basin."
The "Settling Basin" is where the fine particles (Cement) will settle out of suspension. As
designed, this basin is to have a 4:1 Length to Width Ratio in order to maximize the amount
of time required for wash water to flow through the basin. Being that the settling time in this
basin is so imperative, baffles are also to be installed to ensure that "Short Circuiting" is not
possible. (Four Baffles are to be installed dividing this basin into Five equal size chambers.)
From the "Settling Basin" the wash water will move into basin 3 which is the "PH Reduction"
basin. Since cement is very alkaline (pH 12-13) it is necessary to monitor and control the wash
water prior to it's release from this system. A "Fortran" system will be setup at basin 3 which
will ensure that pH levels are acceptable prior to release. (Please seethe manufacturers
specifications, which are included in the Appendix, for details and performance expectations)
Upon release from the "pH Reduction" basin wash water will then disperse and flow across
approximately 100' of undisturbed grass field prior to reaching its receiving water, which is an
unnamed tributary of the Yadkin River.
It is also noteworthy that each basin will be connected by a "Rock Sediment Dam." These BMP
structures employ wide weir's which allow for a thin layer of surface water to slowly move
between each basin. The main purpose of a sediment dam is to "skim" the surface water
(cleanest water) from the upstream basin and allow it move on to the next basin in the series.
This "skimming" characteristic is essential for the proper operation of this system. It
essentially works to trap the smallest particles (cement) that are suspended in the wash water.
These tiny cement particles range in size with its smallest particle being only 1 Micron in
diameter. The retention time required to completely settle out a 1 Micron particle is
extremely difficult to provide. However, creating a system that traps these minute particles is
much more feasible. This system is designed to trap suspended particles in each basin, the
smallest of which will be trapped and eventually settled out in basin 2, the "Settling Basin."
Page 3 of 8

E,
BASIN 1 - "WASHOUT PIT"
Select Treatment Device (BMP Device)
TRSD - Type B
Size Selected BMP Basin
Top Dimensions
Length: 40 Ft
Width: 20 Ft
Depth: 3 Ft (At Weir)
Side Slopes: 1.5 :1 (H:V)
SURFACE AREA = 800 SF
RETENTION VOLUME = 1671 CF
WEIR LENGTH = 10 Ft
BASIN 2 - "SETTLING BASIN"
Select Treatment Device (BMP Device)
*NCDOT BMP Selection & Design Criteria Chart
Best Fit for Application - (Settle Aggregates)
Bottom Dimensions
Length: 31
Width: 11
Basin Size is: Good
Basin Volume is: Good
*NCDOT BMP Selection & Design Criteria Chart
TRSD - Type B Best Fit for Application - (Sized Large to provide extended retention
time to facilitate settling of Small Particles)
Size Selected BMP Basin
Top Dimensions
Length: 200 Ft
Width: 50 Ft
Depth: 3 Ft (At Weir)
Side Slopes: 1 :1 (H:V)
SURFACE AREA = 10000 SF
RETENTION VOLUME = 27786 CF
WEIR LENGTH = 10 Ft
BASIN 3 - "PH REDUCTION BASIN"
Select Treatment Device (BMP Device)
TRSD - Type B
Size Selected BMP Basin
Top Dimensions
Length: 50 Ft
Width: 25 Ft
Depth: 3 Ft (At Weir)
Side Slopes: 2 :1 (H:V)
SURFACE AREA =
1250 SF
RETENTION VOLUME =
2544 CF
WEIR LENGTH =
10 Ft
Bottom Dimensions
Length: 194
Width: 44
Basin Size is: Good
Basin Volume is: Good
*NCDOT BMP Selection & Design Criteria Chart
Best Fit for Application - (Provide Surface Area)
Bottom Dimensions
Length: 38
Width: 13
Basin Size is: Good
Basin Volume is: Good
Page 4 of 8

(a
Retention Time Provided by System
Basin One
Capacity Offered:
1671 CF
Volume of Wash Water:
2,480 CF/DAY
Retention Time:
0.67 DAY
Basin Two
Capacity Offered:
27786 CF
Volume of Wash Water:
2,480 CF/DAY
Retention Time:
11.21 DAY
Basin Three
Capacity Offered:
2544 CF
Volume of Wash Water:
2,480 CF/DAY
Retention Time:
1.03 DAY
TOTAL:
12.90 DAY
Retention i ime Kequirea to Bettie the Average cement Marticie
Particle Settling Velocity
V=gdZ(p1-p2)/18µ
Average Diameter of Cement Particle:
15 microns
1 micron:
3.28E-06 Ft
Average Diameter of Cement Particle:
4.92E-05 Ft
Density of Cement:
94 Ib/ft3
Density of Water:
62.4 Ib/ft3
Viscosity of Water:
5.98E-04 If/ft-sec
Gravity:
32.2 ft/sec2
Settling Velocity for Average 2 29E-04 ft/sec
Cement Particle:
Depth of Settling Basin: 3 Ft
Settling Time for Avg. Cement Particle: 13,106 Sec . = 3.64 Hours 0.15 Days
0.15 Days < 0.67 Days
Therefore:
The average Cement Particle will settle out of the wash water in the "Washout Pit."
This will leave only the smallest of particles to analyze in the "Settling Basin."
Page 5of8

0
0
0
Analyze Settlement of Particles too Fine to Completely Settle Out
Realistically most of the suspended cement particles have settled out in the Washout Pit.
Then, an additional amount of suspended cement settled out at the Rock Sediment Dam.
However, for an increased factor of safety the analysis of basin 2 is to be performed with the
assumption that all suspended cement has passed from basin 1 into basin 2.
cement Grarn size uistribution
Niyr Stu
Diameter
[microns}
Size
distribution[Ft/Sec)
% <
Amount in
System
(Lbs.)
Diameter [Ft]
Settling Velocity
Time to Settle
to Bottom of
Basin (Days)
1
4.7
4.7
130.24
3.28E-06
1.02E-06
34.13
1.5
2.6
7.3
72.05
4.92E-06
2.29E-06
15.17
2
4.8
12.1
133.01
6.56E-06
4.07E-06
8.53
2.5
2.8
14.9
77.59
8.20E-06
6.36E-06
5.46
3
2.8
17.7
77.59
9.84E-06
9.16E-06
3.79
4
4.6
22.3
127.47
131E-05
1.63E-05
2.13
6
7.6
29.9
210.60
1.97 E-05
3.66E-05
0.95
8
6
35.9
166.26
2.62E-05
6.51E-05
0.53
12
10.5
46.4
290.96
3.94E-05
1.46E-04
0.24
16
8.2
54.6
227.22
5.25E-05
2.60E-04
0.13
24
13.8
68.4
382.40
7.87E-05
5.86E-04
0.06
32
10.3
78.7
285.41
1.05E-04
1.04E-03
0.03
48
12.4
91.1
343.60
1.57E-04
2.34E-03
0.01
64
5.2
96.3
144.09
2.10E-04
4.17E-03
0.01
96
2.8
99.1
77.59
3.15E-04
9.38E-03
0.00
128
0.4
99.5
11.08
4.20E-04
1.67E-02
0.00
>128
0.5
100
13.86
Total Settling Time Provided by Basin 2: 11.21 Days * Calculated Previously
Therefore:
1.5 Micron sized particles are the largest that might not completely settle out.
These particles will need to be "Trapped" to prevent them from moving on.
aac4�1111g rnryuncU w F-nrLIVUly I Fop aUapCFJUt:U raFT f-lrb
Depth of Basin (At outlet Weir): 3 Ft Length of Basin: 200 Ft
Assuming that flow is spread equally across width of basin (Baffles should ensure this) settling
time of suspended particles will have a linear correlation to Basin Length. For an added
factor of safety assume that all suspended particles need to have settled at least one third of the
total weir depth to be considered effectively "trapped."
Settled depth of Smallest "Trapped" Particle (1 Micron) at Weir: 1 Ft
Retention time required to settle a 1 Micron particle to this depth: 11.38 Days
Page 6 of 8

•
•
(a
Calculate Amount of Suspended Cement Settled and Trapped in Settling Basin
Diameter
(microns)
Amount of
Suspended
Cement
Introduced to
System (Lbs.)
% of
Settling
Time
Achieved try
Basin
Amount of
Suspended
Cement Settled
to Bottom
(Lbs.)
% of Trapping
Time Achieved
by Basin
Amount of
Suspended
Cement
Trapped in
Basin (Lbs.)
1
130.24
32.83%
42.76
98.49%
85.51
1.5
72.05
73.87%
53.22
100,00%
18.83
2
133.01
100,00%
133.01
100.00%
0.00
2.5
77.59
100.00%
77.59
100.00%
0.00
3
77.59
100.00%
77.59
100.00%
0.00
4
127.47
100,00%
127.47
100.00%
0.00
6
210.60
100.00%
210.60
100.00%
0.00
8
166.26
100.00%
166.26
100.00%
0.00
12
29096
1M00%
29096
100.00%
OM
16
227.22
100.00%
227.22
100.00%
0.00
24
382.40
t00.00%
382.40
100.00%
0.00
32
285.41
100.00%
285.41
100.00%
0.00
48
343.60
100.00%
343.60
100.00%
0.00
64
144.09
100.00%
144.09
100.00%
0.00
96
77.59
100.00%
77.59
100.00%
0.00
128
11.08
100,00%
11.08
100.00%
0.00
>128
13.86
100,00%
13.86
100.00%
0.00
Amount of
Suspended
Cement Passing
out of Settling
Basin (Lbs.)
1.97
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
2771.00 2664.69 104.34
1.97
Calculate Amount of Suspended Cement Settled in Basin 3
Amount of
% of
Amount of
Amount of
Diameter
Suspended
Settling
Suspended
% of Trapping
Suspended
Cement
Time
Cement Settled
Time Achieved
Cement
(microns)
Introduced to
Achieved by
to Bottom
by Basin
Trapped In
System (Lbs.)
Basin
(Lbs.)
Basin (Lbs.)
1
1.97
1.5
0.00
2
0.00
2.5
0.00
3
0.00
4
0.00
6
0.00
1.97 0.00 0.00
Amount of
Suspended
Cement Passing
out of Settling
Basin (Lbs.)
1.97
0.00
0.00
0.00
0.00
0.00
0.00
1.97
Contribution of Basin 3 not counted towards reduction of Suspended Cement for two reasons:
1 Effects of Fortran System circulating Water may reduce settling effectiveness.
2 Any Settlement Achieved in basin 3 will add to overall factor of safety for this system.
Page 7 of 8

•
•
0
\\\`111141kf1!/f�/!
`Z� �H CRR��/����
S
Calculate Nlaxl:mum Dally T55 Levels in outtiowing wasn water •a :-,EALr
r 54
Total Suspended Cement Discharged from System: 1.97 Lbs. c.. 0
Water Discharged from System: 18,755 Galsty'
Amount of Suspended Cement in Outflowing Wash Water: 1.05E-04 Lbs./Gal
/IIII 411\1'�\\
Notes:
1 mg/L = 8.35E-06 Lbs./Gal
Daily TSS: 12.56 mg/L
Maximum Allowable per NCDENR Regulations: 30 mg/L
SYSTEM IS: Acceptable
This System is Designed to effectively treat the wash water for a concrete plant
running at Daily Production Rate of 2,000 CY. The outflowing wash water from this
plant setup will be in conformance with the NCDENR allowable limits for pH, TSS & SS.
This is a temporary concrete plant setup which exists only to service an NCDOT
project. As such, the production rate of 2000 CY/Day will only be achieved a limited
number of times during its lifespan (Less than 2 yrs.). It should be expected that this
system of containment basins will be dry for approximately 70% of their existence.
During these dry periods there will be no outflowing wash water at all.
(Zero TSS, SS, and no pH to Consider)
The Fortran System will be installed to treat the outflowing wash water which will
develop during high production intervals. Since these high production intervals are
anticipated to be infrequent the "pH reduction" basin will be dry for the majority of its
existence. During times where the "pH Reduction" basin is dry, the installed Fortran
System will be inactive.
The wash out basin shall be inspected daily during high production intervals and be
cleaned as necessary. It is important that aggregates and settled fines do not impair
the effectiveness of the Rock Sediment Dam leading into the Settling Basin.
Accumulated aggregates and settled fines shall be properly removed and disposed of
by the Flatiron -Lane.
The settling basin shall be inspected regularly and maintained as necessary. It is
important to ensure that the installed baffles are functioning properly (spreading flow
across width of basin). Replace/Repair any deficient baffles as necessary. Settled
fines are to be removed by Flatiron -Lane as frequently as possible (When dry) to reduce
the risk of their re -introduction into system. At a minimum, settled fines are to be
removed when any basin chamber is 20%full.
8of8

0
ENGrNOGRS CERTIFrCATrON
OF THE MODEL 5000-S PH
MONITORING AND CONTROL SYSTEM
By.
G.G. Environmental, inn,
p.0. Dox 4012.5
Raleigh, NC 27629
For:
Fortranb Inc.
P.O. Box 40
Wendell, NC 27591
Dated
Scptember 11, 2003
C�

(.
C�
C®
G. C. Environmental Inc.
Cr .�
5312 Pinewood Court
Wendell, NC 27591.-
[phone]
s
September 11, 200-3
�'�i,QQ J.
CP
PURPOSE
G.C. Unvironmentrt), Inc-, was contracted to provide an engineers review and certification that the
Model 5000-5 pH Monitor and Control System manufactured by Coastal Carolina Supply in
Morehead City, NC, could effectively provide; on . -I continuous basis, an average pH range of 6-9 units
on the supernato Meyer of a storrnwutcr/rinse water sedimentation basin typically found at Redi-mix
concrCtc faciletiu,"
SCOPI! OF WORK
During the week of August 11, 2003, G.C. Environmental, Inc., witnemed the operation ofthc Model
5000-5 self-contained pH Monitoring and Control System at a Kcdi-inix plant located in Durham, NC,
During the two (2) day test program, measurements were madc within the facilities stormwater/rinse
water sedimentation basin for p[ I, temperature and depth (both supernate and sludge). During the first
day of testing, the basin was 11aund to be heavily loaded with solids, and adjustments were made to the
solids blanket to complete t+ stingy; the following day.
TEST MUTtIODOLOGY
A primaty sedimentation basin located at a. Redi-mix concrete plant located in Durham, NC was
treated utilizing the Model 5000-5 pH Monitor and Control System. During the test program, the
basin was, on a semi -continuous basis, being fed rinse water from the exterior cleaning of cement
trucks. Measurements for pH, temperature, supernate and sludge blankets were made "vit}}in the
sedimentation basin. Initial pH measurements showed pl-I levels of at least 12.0 units. The
sedimentation basin was rectangular in shape with concrete walls and bottom. The basin ranged in
depth of 1 " at the inlet to approximately 3' at the deepest point. Sludge measurements within the basin
showed that at learnt 2/3 of the basins depth was comprised of ~fudge and tho remainder supernate.
The Mode! 5000-5 pl-I M.onitur and Control System was setup attlie rectangular sed':montetion basin
with the intake and discharge hoses situated at opposite ends of' the basin. Roth the intake and
discharge lines were sot at depths within the supernate layor of the basin, A clockwise flow pattern
was established once the unit began oporation and pl-I and temperature measurements were made at
several locations throughout the supernate layer of the, sedimentation basin. Approximately eighteen
(] 8) pl-I and temperature measurements wero collected with it mean pH value of 8-56 and mean
temperature values of 0 94 'C. The pH system watt ]ell to tun essentially on a continuous, basis over
a four (4) hour period. An estimated volume existing, within the sedimentation basin was 25, 000
gallons with a little over 9000 gallons consisting of relatively clear supernate, The amount of 25%

Sulfuric acid (H,SO,) used to treat the sedimentation basins tiuperna€c was approximately 18-20
• gallons.
MODEL 5000-S PII MONITOR AND CONTROL SYSTEM
The model 5000-S pH Monitor and Control System is comprised oFa Hayward Power Plow fl (3/4
hp, 56 GPM) centrifugal pump which delivers raw water to a completely contained pH sensor
connected to a pFl meter equipped with control relays which opeFate two (2) stenner (60 GPD) acid
injection pumps. The acid 25% 1 izSO, is injected into the pump discharge line which empties into the
sedimentation: basin. Sulfuric acid is delivered to the system by 15 gallon carbuoys located outside of
the fiberglass weatherprool'enclosure which houses all of the aforementioned equipment. On top of
the enclosed is an atann light which is tied into the pH meter which is activuted when pH levels exceed
8,5 p14 units or arc below 6.0 units.
CONCLUSION
1. The Modcl 5000-S pl-1 Monitor and Control System is an effective system for the pH balancing of
sedimentation basins which are used to collect stormwater runoffand rinse water, commonly found
at Rcd-mix concrete piant,�.
2. During the test program an average pH of 8.54 units was measured in the subject sedimentation
basin with a range of 7.95 to 9.34 measured,
3. Sludge levels existing within the rectangular sedimentation ranked from 6.0 inches to 2.0 fcct. PH
value~ after pH stabili;Gation at the sludge/supernate interface were approximately 12.0 units
4. For this test program, approximately 180 mg/I of sulfates were added to the sedimentation basin as
a result ofpl~l [adjustment with 25% sulfuric :acid.
5. The 5000-S pH Monitor and Control System is fully automated and provides a pH adjusted waste
water which could effectively he reused within the Redi-mix concrete industry.

0
CO
FORTRANS pH CONTROL SYSTEMS
FORTRANS pH CONTROL SYSTEMS are
completely automatic. They continually monitor/test
the pH of the influent water and compares it to the
pH setting of the control unit. If a change in pH is
detected, the controller activates the solenoid valve
for the CO2. The pH adjustment chemical is then fed
to the return side of the circulation'pump until the
PH is again at the proper level set at the controller,
The unit will continuously circulate the water until a
change in pH is detected and the treatment cyclo
begins once again. The unit also features a digital
pH meter connected to a probe in the sample cell
to ensure unit is functioning properly and that the
correct pH level Is maintained.
The pH CONTROL SYSTEMS are designed to
treat and maintain a specified pH level in a body of
water usually 100.000 gallons or less to allow the
permitted discharge of treated water to the
environment. Per -mils must be obtained from the
local governing agency to allow any discharge to the
environment, Treated water may be used for wetting
of rock and/or dust control to aid compliance with
stormwalor run off regulations. Treated water may
also be used in water recycling systems.
These systems offers precise monitoring and
control of the pH In settling basins, lagoons end
other oulfall containment devices.
-The pH CONTROL SYSTEMS will treat up to
57 gallons per minute - max 20' head pressure.
Unique water circulation design eliminates the need
for separate neutralization tank.
•1.5" quick connect fittings on inlet and return
for easy hook-up. The standard unit is equipped with
2-30'sections of t 5" flexible hose with quick connect
fittings. Inlet and outlet fittings at the basin or lagoon
are per our specifications.
-Unit is shipped completely assembled. The
chemical controller is preprogrammed to maintain a
pH of 7.5. Just attach hoses and PVC fittings.
-1 year warranty on all component parts
and housing.
Fortrans.....
FORTRAN$, INC. - 7400 C. Siemens Rd. • Wendell Mr, 27591
1.066.365.8760 - 1.919.624.8832
Info6fortrarisb1z - Wwwtartruns-biz
The Model 5000-S pH Control System is a self-
contained pH monitor and control system housed in
a weatherproof facility with lockable doors and
adequate space to house the instrumental ion and
circulation pump. The system Is configured for carbon
dioxide gas operation -
The Model 500G-SK Skid Mounted pH Control
System contains all of the instrumentation and
components of the regular Model 5000-S System
and Is shipped on a 4.4"W' plastic skid with a durable
solid plastic surface. The Control Panel is provided
loose with all components installed and is designed
to be attached to are interior wall of the control
building. The tubing to the sample cell and from the
CO2 solenoid valve to the Sparger stone feed
assembly must be inserted after receipt of the unit.
The system features a 115V-30Amp l3reaker Box
and two GFCi receptacles. The system iS shipped
with a CO2 feed system_

C11O7nAAFV "Ll PrIAfTU111 evcTrARc nslfnrl Cnnn_c Q !~nnn-clf
Intake line detail
overhead vises
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wall
n
litm
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r
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the rrturn lino Ix unwed'MY ovcr
lhn h:IFin wail,
Rcium line, Is installed on interior
bide of settling baiir t, 1'aorn with
I W, pig ch,Urtl J;-
Winer flaw
7/� all
valve to facilitates
cnsy priavnc of
pump 11
Option
V
1 1/2" Brut! luck
quick cnnnrct
_ 1}a.611 woll
J-x-
12•,Rcittm lipo rxillct
npproximalely 12"IWrTl
the haupnt of the 6 t<itt
Rcturn Ilrlo outlet i"
Con6lructCd WAI

Fortrans.
f 060Q Qri0�nnl Hrnry na,• P.O. raox 769 Henry. Va.24102 077.387.850s • www.fortmos.blx
l
Model 5000 S & SK pH Control Systems
INSTALLATION NOTES
1. Connect %` hose to hose fitting on the write CO2 injector and the other end
of the hose to the hose fitting on the check valve at the solenoid valve.
Push hose ends all the way into the Ya" hose fittings. (SK Model only)
Note: The CO2 injector is shipped in an upside down position on skid mounted
systems. Turn it to an upright position and tighten union connection_ (SIC Model)
3. Connect hose fitting on return line to the Hose Fitting marked "inlet" on the
sample cell with the W hose. (SK Model)
4. Connect hose fitting on the intake or suction line to the hose fitting marked
"outlet" on sample cell_ (SK Model)
5. Insert pH probe Into probe fitting and tighten. Do not let probe dry. If necessary
add water to sample cell through the probe holder and reinsert pl-I probe.
6. pH probe has been calibrated at the factory. It should be re-rallbrated every
week. See operations manual for calibration instructions_
7. Catalog # 2666-1- ph 4.01 buffer and catalog # 2881-L ph 7 buffer agent are
included. These materials may be re -ordered from Fortrans Inc.
8. It may be necessary to install a'/" PVC ball valve on intake tine in order to fill
line with watef to help prime the pump. See drawing in operation manual for
placement of the ball valve.
9. Use PVC Cleaner and PVC Cement to install Intake and Outlet fitting through
the back of the housing_
14. Plug the pH Controller into the 100() joule surge suppressor.
11. Ground pump to copper grounding rod.
12. Position outlet in basin so that the waterflows parallel to surface of water.
This will create a circular flow in the basin. See drawing for more detail.
13. Install warning light and plug into outlet on right side of controller.
14. Tighten all union connections before operating.
Wkwo of Ihoho Ime) pr6(fuC(-A... tiIKXXS p1d COFIRtrl :iy anm Nfrn1 rrrn:ar C:rnn:rrars H1JJ1Jnvnr -Lair• So:rp 11' 4j:dn ;1.cmp- ° i7.1r nnr3,y-r.:horty Cnr Sonp-
GrCnao01(micr TruckWAIJ) -1- (it N111:1 rA[)" :ilir lark"-:i1gmTNTn:" • Wood lirwivv- - Mtgflt n;ycln Glnnnt r. •I-Iriwrl Wn;;h--Rorkkol W{ir:h--1,iprly BrinhJ-
(o

Practice Standards and Specifications
Definition A small, temporary ponding basin formed by an embankment or excavation
to capture sediment.
Purpose To detain sediment -laden runoff and trap the sediment to protect receiving
streams, lakes, drainage systems, and protect adjacent property,
Conditions Where Specific criteria for installation of temporary sediment trap areas follows:
Practice Applies • At the outlets of diversions, channels, slope drains, or other runoff
conveyances that discharge sediment -laden ~eater.
• Below areas that are draining 5 acres or less.
• Where access can be maintained for sediment removal and proper
disposal.
• In the approach to a stortnwater inlet located below a disturbed area as
part of ant inlet protection system.
• Structure life limited to 2 years.
A temporary sediment trap should not he located in an intermittent or
perennial stream.
Planning Select locations for sediment traps during site evaluation. Note natural
Considerations drainage divides and select trap sites so that runoff from potential sedintent-
produeing areas can easily be diverted into the traps.. Ensure the drainage
areas :for each trap does not exceed 5 acres. Install temporary sediment traps
before land disturbing takes place within the drainage area.
Make traps readily accessible for periodic sedfinent removal and other
necessary maintenance. Plan locations for sediment disposal as part of trap
site selection. Clearly designate all disposal areas on the plans.
In preparing plans for sediment traps, it is important to consider provisions to
protect the embankment from fai lure from storm runoff that exceeds the design
capacity. Locate bypass outlets so that flow will not damage the embattlement.
Direct emergency bypasses to undisturbed natural, stable areas. Ifa bypass is
not possible and failure would have severe consequences, consider alternative
sites.
Sediment trapping is achieved primarily by settling within it pool formed by
an embankment. The sediment pool may also be formed by excavation, or by
a combination of excavation and embankment. Sediment -trapping efficiency
is a function of surface area and inflow rate (Practice 6.61, Sediment Basin).
Therefore, maximize the surface area in the design. Because porous baffles
improve flow distribution across the basin, high length to widdt ratios are not
necessary to reduce short-circuiting and to optimize efficiency.
Because.well planned sediment traps are key measures to preventing off -
site -sedimentation, they should be installed in the first stages of project
development.
Rev. 6l06 6.60.1

Design Criteria Summary: TemRgrriUSedinngntTrap
Primary Spillway: Stone Spillway
Maximum Drainage Area: 5 acres
Minimum Volume: 3600 cubic feet per acre of disturbed area
Minimum Surface Area: 435 square feet per cfs of Q10 peak inflow
Minimum WW ltntio: 2:1
Minimum Depth: 3.5 feet, 1.5 feet excavated below grade
Maximum Height: Weir elevation 3.5 feet above grade
Dewatering Mechanism: Stone Spillway
Minimum Dewatering Time: NIA
Baffles Required: 3
Storage capacity —Provide a minimum volume of 3600 Vacre of disturbed
area draining into the basin. Required storage volume may also be determined
by modeling the soil loss with The Revised Universal Soil Loss Equation or
other acceptable methods. Measure volume to the crest elevation of the stone
Spillway outlet.
Trap. eleanout--Remove ccdiutw -from the trap, and restore the capacity
to original trap dimensions when sediment has accumulated to one-half the
design depth.
'[Yap efficleuey The folloxviog design elenients most be provided for
adequate trapping efficiency:
• Provide a surface area of 0.01 acres (435 square feet) per cfs based on the
10-year storm;
\ • Convey runoff into the basin through stably diversions or temporary slope
drains;
• Locate sediment inflow to the basin away from the dam to prevent short
circuits from inlets to the outlet;
• Provide porous baffles (Practice 6.65, Por us Baffles);
• Excavate 1.5 feet of the depth of the basin below grade, and provide
minimum storage depth of 2 feet above grade.
Embankment --Ensure that embankments for temporary sediment traps do
not exceed 5 feet in height. Measure from the center line of the original ground
surface to the top of the embankment. Keep the crest of the spillway outlet
a minimum of 1.5 feet below the settled top of the embankment. Freeboard
may be added to the embankment height to allow flow through a designated
bypass location. Construct embankments with a minimum top width of feet
and side slopes of 2:1 or flatter. Machine compact embankments.
Excavation —Where sediment pools are formed or enlarged by excavation,
keep side slopes at 2:1 or flatter for safety.
Outlet section ---Construct Ilse sediment trap outlet using a stone section of
the embankmeut located at the low point in the basin. The stone section serves
two purposes: (1) the top section serves as a non -erosive spillway outlet for
flood flows; and (2) the bottom section provides a means of dewalering the
basin between runoff events.
Stone size —Construct the outlet using well -graded stoues with a d5a size of 9
inches (Class B erosion control stone is recoitunended) and a maximum stone
r
6.60.2
Retie 6106

Practice Standards and Specifications
size of 14 inches, The entire upstream Face' of the rock structure should be
covered with fine gravel (NCDOT #57 or #5 wash stone) a minimum of I foot
thick to reduce the drainage rate.
Side slopes —Keep the side slopes of the spillway section at 2:1 or flatter.
To protect the embankment, steep the sides of the spillway at least 21 inches
thick.
Depth —The basin should be excavated 1.5 feet below grade.
Stone spillway height —The sediment storage depth should be a minimum of
2 feet and a maximum of 3.5 feet above grade.
Protection from piping —Place filter cloth on the foundation below the riprap
to prevent piping. An alternative would be to excavate a keyway trench across
the riprap foundation and up the sides to the height of the dam.
Weir length and depth —Keep the spillway weir at least 4 feet long and sized
to pass the peak discharge of the 10-year storm (Figure 6.60a). A maximum
flow depth of six inches, a minimum freeboard of 1 foot, and maximum side
slopes of 2:1 are recommended. Weir length may be selected from Table 6.60a
shown for most site locations in North Carolina.
Cross —Section 12'min• of NCDOT#5 �---m
or #57 washed stone ,►, �_.. - ---- .------ --
' min.
3600 cq ft/acre =
5'
filter
fabric
Design settled
top �,n•
Plan View
f
3' ►l
fabwric min.
Figure 6.60a Plan view and cross section view of a temporary sediment, trap.
Rev. 6M
Overf116" for
settlement
Natural
Ground
Emergency by-
pass 6" below
settled tap of
dam
6.60.3

1-1
I
6.60.4
0
Table 0,60a
Design -of Spillways
Drainage Area
Weir Length'
(acres)
00
1
4.0
2
6-0
3
610
4
10.0
5
12,0
' gmens[ons shown are minimum.
Construction 1. Clear, grub, and strip the area under the embankment ofall vegetation and
Specifications root mat. Remove all surface soil containing high amounts of organic matter,
and stockpile or dispose of it properly. Haul all objectionable material to the
designaled disposal area.
2. Ensure that fill material for the embankment is free of roots, woody
vegetation, organic matter, and other objectionable material. Place the fdl in
lifts not to exceed 9 inches, and machine compact it. Over fill the embankment
6 inches to allow for settlement.
3. Constntct the outlet section in the embankment. Protect the connection
behveen the riprap and the soil from piping by using filter fabric or n keyway
cutoff trench between the riprap structure and soil.
• Place the filter fabric between the riprap and the soil. Extend the fabric
across the spillway foundation and sides to the top of the dam; or
• Excavate a keyway trench along the center line of the spillway foundation
extending up the sides to the height of the dam. The trench should be at
least 2 feet deep and 2 feet wide with 1:1 side slopes.
4. Clear the pond area below the elevation of the crest of the spillway to
facilitate sediment cleanout,
5. All cut and fill slopes should be 2:1 or flatter.
6, Entire that the stone (drainage) section of the embankment has a
minimum bottom width of 3 feet and maximum side slopes of 1:1 that extend
to the bottom of the spillway section.
7. Construct the minimum finished stone spillway bottom width, as shown
on the plans, with 2:1 side slopes extending to the top of the over filled
embankment. Keep the thickness of the sides of the spillway outlet structure
at a minimum of 21 inches. The weir mast be level and constructed to
grade to assure design capacity.
8. Material used in the stone section should be a well -graded mixture of stone
with a dr, size of 9 inches (class 8 erosion control stone is recommended) and
a maximum stone size of 14 inches. The stone may be machine placed and the
smaller stones worked into the voids of the larger stones. The stone should be
hard, angular, and highly weather -resistant.
9. Discharge inlet water into the basin in a mariner to prevent crosiou. Use
temporary slope drains or diversions with outlet protection to divert sediment -
laden wntcr to the upper end of the pool area to improve basin trap efficiency
(References: Runoff Control kfeasu es and Outlet Pl otectio)r).
Rev, 6106

t �Y
Practice Standards and Specifications
10. Ensure that the stone spillway outlet section extends downstream past the
toe of the embankment until stable conditions are reached and outlet velocity
is acceptable for the receiving stream. Keep the edges of the stone outlet
section flush with the surrounding ground, and shape (lie center to confine the
outflow stream (References: Outlet Protection).
11. Direct emergency bypass to natural, stable areas. Locate bypass outlets
so that flow will not damage the embankment.
12, Stabilize the embankment and all disturbed areas above the sediment pool
and downstream from the trap immediately after construction (References:
.Surface Stabilization).
13. Show the distance from the top of the spillway to the sediment cleanout
level (112 the design depth) on the plans and mark it itu the field.
14. Install porous baffles as specified in Practice 6.65, Parowv Baffles.
Maintenance Inspect temporary sediment traps at least weekly and after each significant (
rich or greater) rainfall event and repair immediately. Remove sediment, and
restore the trap to its original dimensions when the sediment has accumulated
to one-half the design depth of the trap. Place the sediment that is removed in
the designated disposal area, and replace the part of the gravel facing that is
impaired by sediment.
Check the structure for damage from erosimi or piping. Periodically check the
depth of the spillway to ensure it is a minimum of I.5 feet below the lots point
of the embankment. Immediately fill any settlement of the embankment to
slightly above design grade. Any rfprap displaced from the spillway Dust
be replaced immediately.
After all sediment -producing areas have been permanently stabilized, remove
the stricture and all unstable sediment. Smooth the area to blend with the
adjoining areas, and stabilize properly (References: Surface Stabilization).
References Or11et Protection
6.41, Outlet Stabilization Structure
Runoff Control Measures
6.20, Temporary Diversions
6.21, Permanent Diversions
6.22, Diversion Dike (Perimeter Protection)
6.23, Right-of-way Diversion (water Bars)
Surface Stabilization
6.10, Temporary Seeding
6.11, Permanent Seeding
6.15, Riprap
Sediment P wps and Ban•iers
6.61, Sediment Basins
6.64, Skimmer Basins
6.65, Porous Baffles
North Carolina Department of 7Y-ansportadon
i Standard Specifications for Roads and Structures
C -
Rea 6106 6.60.5
k;

116131 5A' /Yq2 ;i`l
Ln
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0
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WASHOUT PIT
B Al TOP DIMENISIOtl15: 40' m 20'
A A
...... ....u.. ................................... ....,.
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[anrraie Wash T
� 5+.'MIInG NaLin
O�attO^t �tarnTr�mrr�lnns 31' K 11 •�
8
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Section 6-6
A,S' 11' 4_S'
- - 73
Settling Basin
-_c ctr.tet�s;.cras: 200xs0.
Aa
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rM
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Section 8-9
4
3
pH Reduction Basin
8 TOP DIMENSIONS: 5V x 25'
A A
inflow Fran, Fully T^Sated
_ Washwatei
Stilling Basin M flutt5ow
8P1t4m [hnnt•fr►/WI) 3>S' K 14
it
Section A-46
3` �� o
6' 38' 6'
Section 8.8
GRAPHIC SCALE
50 25 0 50 100
PLANS
THE
�u& LANE
CONSTRUCTION
FLATIRON CORPORATION
SITE PLAN FOR TEMPORARY
CONCRETE BATCH PLANT
MEASURED SAY
IMPERVIOUS DRAINAGE AREA
1.85 AC 1.9 AC
(Plant Yard)
MEASURED SAY
PERVIOUS DRAINAGE AREA
1.83 AC 3.15 AC
(Grassed Fields)
1 �
736 �� Existing Ditchline/
�31 �32 J� 3r✓Q//
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a ° ' �.
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DISCHARGE POINT
(Towards Streams J r 01
EXISTING STREAM
(Un-named Tributary to the Yadkin River)
A,
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(1488 STORM WATER SKIMMER BASIN
TOP DIMENSIONS 150' ■ 5.
FS. ',_ ,.��.....s......................... ........... .................... .......... ERM DITCH
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Build the Best, Be the Best.
March 18`h, 2011
Stormwater Permitting Unit
Division of Water Duality
1617 Mail Service Center
Raleigh, NC 27699-1617
Attention: Robert D. Patterson, PE
Environmental Engineer
TOE
LANE
Pop Y Io FLATIRON N
Reference: North Carolina Department of Transportation
Contract No. C202383
1-85 Yadkin River Bridge Replacement & Interstate Reconstruction
NCG 140000 Permit Application
Mr. Patterson,
Flatiron -Lane, JV
Yadkin River Bridge
105 Jacobs Lambe Lane
Salisbury, NC 28146
704.63T2366 MAIN
704.637.2364 Fax
www.flatironcorp.com
Letter No. NCDENR-003
OMS00891
Reference is made to your letter dated March 7Ih 2011 regarding the above referenced permit application
that was submitted to your office on February 23rd, 2011. Attached to this letter you will find the following
additional information:
1. The original signed NO[ application form.
2. Three sets of full-size plans and the applicable details sheets.
As mentioned in the original permit application, your attention to this application is greatly appreciated. Due
to the fast track nature of this project it is requested that your review of this permit application continues to be
expedited. Should you have any additional questions please contact Casey Hurley directly at 919-279-7264.
If I may be of any service to you please contact this field office at 704-637-2366.
Sincerely,
FLATIRON - LANE, JV
Adam Mathews
Project Manager
cc: CPH, CL, MG, 5D, JB, DC
An Equal Oppunundy Emp"

MA
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NCDEW
North Carolina Department of Environment and
Division of Water Quality
Beverly Eaves Perdue Coleen H. Sullins
Governor Director
March 7, 2011
Mr. Casey P. Hurley, PE
Flatiron -Lane, A Joint Venture
105 Jacobs Lambe Lane
Salisbury, NC 28146
Natural Resources
Subject: Additional Information Request
Future COC NCG 140406
Dee Freeman
Secretary
Temporary Concrete Batch Plant — Flatiron -Lane
Davidson County
Dear Mr. Hurley:
Your facility's Notice of Intent (NOI) for permit NCG140000 was received by the Stormwater
Permitting Unit on February 23, 2011. However, a review of the application package showed that
the application is incomplete. Before the NOI can finish being processed please provide
information regarding the following:
1. Please provide the original signed NOI. All 3 submitted were copies.
2. The l I"x17" site schematic provided is insufficient. Three (3) sets of full-size plans and
details are required per the final checklist at the end of the NOI. All plans and details must be
sealed by a Professional Engineer or other qualified professional per G.S. 89C-25 (7). As per
the Final Checklist on page 5 of the NOI that you submitted, note that the site plan (check box
6) must provide all of the elements listed as a through g. The plans and details must also show
existing & proposed contours/elevations, surface waters & wetlands, plans & cross -sections of
basins, diversion details, and delineated drainage areas for stormwater and wastewater Flows.
If you have any questions concerning this permit, please contact Robert Patterson at telephone
number (919)-807=6375 or -at [e-mail].
Sincerely,
/ 0y
Robert D. Patterson, PE
Stormwater Permitting Unit
Wetlands and Stormwater Branch
1617 Mail Service Center, Raleigh, North Carolina 27699.1617
Location: 512 N. Salisbury St. Raleigh, North Carolina 27604
Phone: 91U07-63001 FAX: 919-BD7-64941 Customer Service: 1-877-623-6748
Internet: www.newaterquality.o+g
cc: Winston-Salem Regional Office
SPU Files
NonrthCarolina
Naturally
Art Equal opponuni3y 1Allimelmr Action En*yer

FLATIRON -LANE A JOINT VENTURE
10188 E. 1-25 FRONTAGE ROAD,
FIRESTONE, CO 80504
VENDOR NAME
AP"4 CHECK NO.
NCDENR
734
VENDOR 0
CHECK DATE
730695
02117111
1NV
DATE
INVOICE NUMBER
: `- •� -. - ., ; .
j ..
...,. DESCRIPTION
GROSS AMOUNT
DEDUCTION
NET AMOUNT '
21611
021611
WASTE WATER PERMIT
100.00
100.00
i
DETACH REMITTANCE ADVICE BEFORE DEPOSITING CHECK
^' TOTAL$ J'" • °
00 00
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t-'� .�
I ` . _ - -� • 100.00
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