NCG140441_COMPLETE FILE - HISTORICAL_20171129

STORMWATER DIVISION CODING SHEET
RESCISSIONS
PERMIT NO.
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7
DOC TYPE
❑COMPLETE FILE -HISTORICAL
DATE OF -
RESCISSION
p c2-,61
YYYYMMDD

F
Energy. Mineral &
Land Resources
ENVIRONMENTAL QUALITY
Mr. Christopher M. Ange
2814 Assembly Road
Greensboro, NC 27405
Dcar Mr. Christopher:
November 29,2017
ROY COOPER
covemor
MICHAEL S. REGAN
Seu-etar-y
TRACY DAVIS
Director
Subject: Rescission of NPDES Stormwater Permit
Certificate of Coverage Number NCG140441
Guilford County
1-he Division of Energy, Mineral and Land Resources received your request to rescind your
coverage under Certificate of Coverage Number NCG ] 40441. In accordance with your request,
Certificate of Coverage Number NCG14044I is rescinded effective immediately.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.
If you have questions about this matter, please contact us at 919-707-9200, or the Stormwater
staff in our Winston-Salem Regional Office [phone].
cc: ]�inston-Salem Regional Office
!/Stormwater Permitting Program
Central Files
Sincerely,
Original signed by
Robert D. Patterson, P.E.
fior Tracy E. Davis, PE, CPM, Director
Division of Energy, Mineral and Land Resources
Nothing Compares_
State of North Carolina I Environmental QUali(y f Energy, Mineral and Land Resources
512 N. Sallsbury Street 1 1612 Mail Service Center I Raleiy9r, Nc r th Carolina 27h9�1 IL l2
919 707 9200

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NC®ENR
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Division of Energy, Mineral & Land Resources
Land Quality Section/Stormwater Permitting Program
National Pollutant Discharge Elimination System
RESCISSION REQUEST FORM
FOR AGENCY
USE ONLY
Date Received
Year
Month Da
Please fill out and return this form if you no longer need to maintain your NPDES stormwater permit.
1) Enter the permit number to which this request applies:
Individual Permit (or) Certificate of Coverage
IN =.C}. s 'iv�:.Y� f 4 0 4 All
2) Owner/Facility Information: ' Final correspondence will be mailed to the address noted below
- --Owner/Facility Name The Cane Construction Corporation
Facility contact Christopher M. Ange T
Street Address 2B14 Assembly Rd
City Greensboro state NC ZIP Code 27405
County Guilford E-mail Address cmanaePlaneconstruct.com
Telephone No. 336 406-9060 Fax:
3) Reason for rescission request (This is required information. Attach separate sheet if necessary):
® Facility closed or is closing on C8/7/:17 . All industrial activities have ceased such that no discharges of
stormwater are contaminated by exposure to industrial activities or materials.
❑ Facility sold to l on �, . If the facility will continue operations under the new owner.it
may be more appropriate to request an ownership change to reissue to permit to the new owner.
❑ Other:
4) Certification:
OENR-LAND QUA1LiTY
I, as an authorized representative, hereby request rescission of coverage under the NPDE§M%W1%RMERXT4v1it&
subject facility. I am familiar with the information contained in this request and to, the best of my knowledge and belief -
such irif6rmation is tru omplete a d accurate.
g- -
Signature Date Aor--
Christopher M. Ange, PE Senior Job Engineer
Print or type name of person signing above Title
Please return this completed rescission request form to
NPDES Permit Coverage Rescission VI
`1
Stormwater Permitting Program
1612 Mail Service Center
Raleigh, North Carolina 27699-161
a
1612 Mail Service Center, Raleigh, North Carolina 27699-1612
Phone: [phone] S FAX: [phone]
An Equal Opportunity 1 Affirmative Action Employer
C

Alexander, Laura
From: White, Glen
Sent: Thursday, August 24, 2017 11:30 AM
To: Alexander, Laura
Cc: White, Sue
Subject: NCG140441 (Rescission Request)
Attachments: NCG 140441GUILF 08-23-2017 - RECOMMEND RESCISSION.pdf
Laura
I visited 2814 Assembly Road on 8/23/17. The temporary concrete plant has been removed and the site appears
compliant. Recommend that the request for rescission be granted.
Glen White
Environmental Specialist
NCDENR Winston-Salem Regional'Office
Division of Energy, Minerals & Land Resources
450 Hanes Mill Rd — Suite 300
Winston-Salem, NC 27105
glen. [e-mail]
[phone]
11

Compliance Inspection Report
Permit: NCG140441 Effective: 08/01/17 Expiration: 06/30/22 Owner : The Lane Construction Corporation
SOC: Effective: Expiration: Facility: Greensboro Eastern Urban Loop Concrete Batch Pip
County: Guilford 2814 Assembly Rd
Region: Winston-Salem
Greensboro NC 27405
Contact Person: David Chaparro Title: Phone: [phone]
Directions to Facility:
From intersection of 140 and US 29 in Greensboro head north on US 29 10.2 miles to the northwest quadrant of the intersection of
US 29 and Assembly Road.
System Classifications:
Primary ORC: Certification: Phone:
Secondary ORCjs�:
On -Site Representative(s):
Related Permits:
Inspection Date: 08/24/2017 Entry Time: 11:30AM Exit Time: 12:OOPM
Primary Inspector: Glen White Phone: [phone]
Secondary Inspector(s):
Reason for Inspection: Routine Inspection Type: Compliance Evaluation
Permit Inspection Type: Ready Mix Concrete Stormwater/Wasiewater Discharge COC
Facility Status: Compliant Not Compliant
Question Areas:
Storm Water
(See attachment summary)
Page: 1

Permit: NCG 140441 Owner - Facility: The Lane Construction Corporation
Inspection Date: 08/24/2017 Inspection Type : Compliance Evaluation Reason for Vie It: Routine
Inspection Summary:
This was a temporary ready mix concrete facility and staging area for highway construction. Glen White visited the site on
8/23/2017 following request for rescission. The concrete plant has been removed from the location and equipment was being
hauled away at the time of inspection. Significant heavy equipment and construction materials remain at the site but the
site no longer meets the SIC requiring an NCG140000 and does not appear to meet requirements of another stormwater
permit. Site is compliant and qualifies for rescission. NCDEQ - WSRO is fine with rescission. -
Glen White
Page: 2

permit: NGG140441 Owner - Facility: The Lane Construction Corporation
Inspection Date: 08124/2017 Inspection Type : Compliance Evaluation Reason for Visit: Routine
Page: 3

Division of Energy, Mineral, and Land Resources
Land Quality Section / Stormwater Program
National Pollutant Discharge Elimination System (NPDES)
Energy, Mrnera!& PERMIT OWNER AFFILIATION DESIGNATION FORM
Land Resources
ENVIRONMENTAL OaAUTY (Individual Legally Responsible for Permit)
Use this form if there has been:
FOR AGENCY USE ONLY
Date Received
Year Month
Da
NO CHANGE in facility ownership or facility name, but the individual
who is legally responsible for the permit has changed.
If the name of the facility has changed, or if the ownership of the facility has changed,
do NOT use this form. Instead, you must fill out a Name -Ownership Change Form
and submit the completed form with all required documentation.
What does "legally responsible individual" mean?
The person is either:
• the responsible corporate officer (for a corporation);
• the principle executive officer or ranking elected official (for a municipality, state, federal or other public
agency);
the general partner or proprietor (for a partnership or sole proprieto'rship);
or, the duly authorized representative of one of the above.
1) Enter the permit number for which this change in Legally Responsible Individual ("Owner Affiliation")
applies:
Individual Permit
N I C I S
2) Facility Information:
Facility name: DECEIVED
Company/Owner'Organization:
Facility address: MAY 10 2017
I)UNR=LAND OYALITY
STOROXT-SR PERMRINB
(or) Certificate of Coverage
N I c I G I l y I OIj I 4
�'R&EAlS[3nQn t✓ asmyat4 ua4N Loop CoAtc.r &T-e
..����A��M�L��
Address
G2rEt•!sAo2-�o NL .2--7�� 5
City State zip
g&CH Pt.41AT
S 2-TG
To find the current legally responsible person associated with your permit, go to this website:
http://deq.nc.gov/about/divisions/enemy-mineral-]and-resources/energy-niinera]-land-hermits/stonnwater-program
and run the Permit Contact Summary Report.
3)
Previous
TION that should be removed:
MI
4) NEW OWNER AFFILIATION (legally responsible for the permit):
Person legally responsible for this permit: OF} V � D %� C� HL t 1 Q
First MI Last
Page I of 2
S W U-OW NERAFF11r23March2017

NPDES Stormwater Permit OWNER AFFILATION DESIGNATION Form
(if no Facility Name/Ownership Change)
5) Reason for this change:
A result of:
A A"f�6-61Z
Title
6 la T wol- A CF_ mypntr�_ D Q_
Mailing Address
r_HAi4nTjE N C_ 1-cd;� 4-7-
City State Zip
C:'. 61 S - u61-1 QAC.H,4P.pp�Oec.a•��
Telephone E-mail Address CoNST�CTG7. CAM
Fax Number
❑ Employee or management change
❑ Inappropriate or incorrect designation before
Other
If other please explain: _A0c2X E5 f t/l, i-S T—N 60¢-9-�r7
The certification below must be completed and signed by the permit holder.
PERMITTEE CERTIFICATION:
I, Aw (r6- , attest that this application for this change in Owner Affiliation
(person legally responsible for the permit) has been reviewed and is accurate and complete to the best of my
knowledge. I understand that if all required parts of this form are not completed, this change may not be
processed.
ignature Date
PLEASE SEND THE COMPLETED FORM TO:
Division of Energy, Mineral, and Land Resources
Stormwater Program
1612 Mail Service Center
Raleigh, North Carolina 27699-1612
For more information or staff contacts, please call [phone] or visit the website at:
http://deq.ne.gov/about/divisions/energy-mineral-land-resources/stonnwater
Page 2 of 2
SWU-OWNERAFFII 23Mar2017

North Carolina Department of Environmental Quality
Pat McCrory
Governor
Chad M. Curran
The Lane Construction Corporation
6125 Tyvola Centre Dr.
Charlotte, NC 28217
Dear Mr. Curran:
Donald R. van der Vaart
Secretary
September 24, 2015
Subject: General Permit No. NCG 140000
Greensboro Eastern Loop
Temporary Concrete Plant
COC NCG140441
Guilford County
In accordance with your application for a discharge permit received on August 17, 2015, we are
forwarding herewith the subject certificate of coverage to discharge under the subject state -- NPDES
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
Energy, Mineral, and Land Resources. The Division 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 Energy, Mining, and Land Resources, or permits required by the Division of Water
Resources, Coastal Area Management Act, or any other federal or local governmental permit that may be
required.
If you have any questions concerning this permit, please contact Richard Riddle at telephone number
[phone].
Sincerely,
ORIGINAL SIGNED BI
KEN PICKLE
for Tracy E. Davis, P.E., CPM
cc: Winston Salem Regional Office
Central Files
Stormwater Permitting Program Files
Division of Energy, Mineral and Land Resources
Energy Section + Geological Survey Section • Land Quality Section
1612 Mail Service Center, Raleigh, North Carolina 27699-1612 • Telephone [phone]/ FAX: [phone]
512 North Salisbury Street, Raleigh, North Carolina 27604 • Internet: http://Dortal.ncdenr.org/web/Ir/
An Equal Opportunity 1 Affirmative Action Employer — 50% Recycled 110% Post Consumer Paper

STATE OF NORTH CAROLINA
DEPARTMENT OF ENVIRONMENTAL QUALITY
DIVISION OF ENERGY, MINERAL, AND LAND RESOURCES
GENERAL PERMIT NO. NCG140000
CERTIFICATE OF COVERAGE No. NCG140441
STORMWATER and 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,
The Lane Construction Corporation
is hereby authorized to discharge stormwater and process wastewater from a facility located at
Greensboro Eastern Urban Loop — Temporary Concrete Plant
2814 Assembly Road
Greensboro
Guilford
to receiving waters designated as -Haw River, a class WS-V, NSW water in the Cape Fear River
Basin, in accordance with the effluent limitations, monitoring requirements, and other conditions
set forth in Parts 1, I1, II1, and IV of General Permit No. NCG 140000 as attached.
This certificate of coverage shall become effective September 24, 2015.
This Certificate of Coverage shall remain in effect for the duration of the General Permit.
Signed this day September 24, 2015
ORIGINAL SIGNED B)
KEN PICKLE
for Tracy E. Davis, P.E., Director
Division of Energy, Mineral, and Land Resources
By the Authority of the Environmental Management Commission

11441 11 Thp Lane Cnnstructinn C_mmni
f1:1InweIOTI
:f:i ire] I1:

North Carolina Department of Environmental Quality
Pat McCrory Donald van der Vaart
Governor Secretary
September 22, 2015
TO: Richard Riddle
NCDEML,R Stormwater Permitting Program
FROM: David Wainwright 9
Division of Water Resources SEPA Coordinator
SUBJECT: NCO140441 Review
Greensboro Eastern Loop Temporary Concrete Plant
Guilford County, North Carolina
On September 8, 2015 you requested comments regarding the NCG140441 review for a temporary
concrete plant for the Greensboro Eastern Loop project in Guildford County. Although the September 23,
2015 comment deadline has not passed, comments have been received from all requested commenting
agencies. Please find the attached comments from the Winston-Salem Regional Office Public Water
Supply Section.
Should you need anything further, please feel free to contact me at [e-mail] or
919-807-6442.
1611 Mall Service Center, Raleigh, North Carolina, 27.699-1611
Location: 512 N. Salisbury St., Raleigh, North Carotina, 27604
Phone: [phone]/Fax: [phone]
An Equal Opportunity\Af innative Action Employer

Pal McCrory
Governor
WA
ATA
RUHR
North Carolina Department of Environment and Natural Resources
September 8, 2015
Memorandum
To: Regional Water Supply Supervisor, DWR Public Water Supply Section
From: Richard Riddle, Jr., DEMLR Stormwater Permitting Program
Subject: Review of the discharge location for the following:
Greensboro Eastern Urban hoop -Temporary Concrete Plant
2814 Assembly Road
Greensboro, NC 27405
Guilford
NCG1.40441
Reported receiving water: Haw River (WS-V; NSW)
Donald R. van der Vaaa
Secretary
Please indicate your agency's position on the facility listed above. Attached is the staff report or
other application information for this facility. 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: 1-2-0 1 5
1612 Mail Service Center, Raleigh, North Carolina 27699-1612 - Telephone [phone] FAX, 919-733-2876
512 North Salisbury Street, Raleigh, Notch Carolina 27604 - Internet: hLIQalportal.ncdenr.org/web/Ir/Iand•ouality
An Equal Opportunity 1 Affirmative Action Employer - 50% Recycled 110% Post Consumer Paper

. . 1
AWKWA
NCDENR
North Carolina Department of Environment and Natural Resources
Pat McCrory
Governor
September 8, 2015
Memorandum
To: Regional Water Supply Supervisor, DWR Public Water Supply Section
From: Richard Riddle, Jr., DEMLR Stormwater Permitting Program
Subject: Review of the discharge location for the following:
Greensboro Eastern Urban Loop - Temporary Concrete Plant
2814 Assembly Road
Greensboro, NC 27405
Guilford
NCG140441
Reported receiving water: Haw River (WS-V; NSW)
Donald R. van der Vaart
Secretary
Please indicate your agency's position on the facility listed above. Attached is the staff report or
other application information for this facility. 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:
1612 Mail Service Center, Raleigh, North Carolina 27699-1612 • Telephone [phone] FAX: [phone]
512 North Salisbury Street, Raleigh, North Carolina 27604 • Internet: http:llportal.ncdenr.orglwebllrlland-quality
An Equal Opportunity 1 Affirmative Action Employer — 50% Recycled 110% Post Consumer Paper

. "
NCDENR
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EH VIFo—e .0 NATURAL RE50U CES
NOTICE OF INTENT
Division of Energy, Mineral and Land Resources
Land Quality Section
National Pollutant Discharge Elimination System
NCG140000
FOR AGi:NCY USE ONLY
Date Received
Year
Month
Day
CertifiealcofCovcri c
Check H t�Ajnounl
Pcmiil Ass' d 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 and like activities - Ready Mixed Concrete
This NOI may be an application to discharge process wastewater. NCG140000 contains effluent limitations for
process wastewater discharges. Wastewater discharges must meet the requirements of these effluent
limitations. An exceedance of any of these limitations will result in a violation of the permit conditions.
For questions, please contact the DEMLR Central Office or Regional Office in your area. (See page 6)
(Please print or type)
1) Mailing address of owner/operatorlofficial address to which all permit correspondence will be mailed :
(Please print or type all entries in this application form.)
• Legal Owner Name: The Lane Construction Corporation
•
{Please attach the most recent Annual Report to the NC Secretary of State showing the current legal name. Alternatively this
permit can be given to an individual.)
Signee's Name (as signed for in question 29 below) Chad Curran
Street Address: 6125 Tyvola Centre Drive
City: Charlotte State: NC ZIP Code: 28217
Telephone No.: [phone] Email: [e-mail]
Alternate Contact Name: Email (if different):
Alternate Contact Telephone (if different):
2) Location of facility producing discharge:
Facility Name: Greensboro Eastern Urban Loop Concrete Batch Plant Site
Facility Contact: Chad M. Curran
Street Address: 2814 Assembly Rd
City: Greensboro State: NC ZIP Code: 27405
County: Guilford
Telephone No.: [phone] Fax: [phone]
3) Physical location information:
F?ECEIVSD
AUG 17 2015
OE"ll-LAND QUALITY
STORMWATER PERM17'TING
Please provide narrative directions to the facility (use street names, state road numbers, and distance and
direction from a roadway intersection): From the intersection of 140 and US 29 in Greensboro head north
on US 29 10.2 miles to the northwest quadrant of the intersection of US 29 and Assembly Rd.
(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: 36 Deg 8 Min 35.6 Sec Longitude _79 Deg 44 Min 19.19 Sec
5) This NPDES Permit Application applies to the following (check all that apply):
Page 1 of 8
Last revised 812114

NCG140000 N.O.I.
0
❑ New or Proposed Facility
Date operation is to begin: 10/9/2015
❑ Existing Facility Permit #
SWU-229-11032011
6) Consultant's application information:
Consultant:
Consulting Firm:
Mailing Address:
City:
State:
Phone:( )
Email:
Zip Code: _
Fax: ( )
(Optional)
Staple Business Card Here:
7) Provide the 4 digit Standard Industrial Classification Code (SIC Code) that describes the primary industrial
activity at this facility: SIC Code: 3273
8) Provide a brief description of the types of industrial activities and products produced at this facility: (Attach
a site diagram showing the process areas present at this facility.): Temporary Concrete batch plant to
manufacture concrete for the Greensboro Eastern Urban Loop project. The operation will include material
stockpiles, bulk water storage, bulk fiyash and cement storage.
Stormwater Discharae. Wastewater Treatment & Discharae and Permittina Information
• 9) Discharge points / Receiving waters: One
Number of discharge points (ditches, pipes, channels, etc.) that convey stormwater and/or wastewater from
the property:
Stormwater-only. 1 Wastewater -only., 1 Wastewater Commingled with Stormwater: NA
For new facilities: Expected date of commencement of discharge: 10/1/2015
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? Haw River
Receiving water classification(s), if known:
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).
Will this facility discharge wastewater to SA (Shellfishing) waters? ❑ Yes X No
Note: Discharge of process wastewater to receiving waters classified as WS-II to WS-V or SA must
be approved by the N.C. Division of Water Resources, Public Water Supply Section. If DWR
does not approve, coverage under NCG140000 cannot be granted. No new discharges of
process wastewater are permitted in receiving waters classified as WS-1 or freshwater ORIN.
10) Each applicant shall provide the following information (attach additional sheets as necessary):
• Two (2) site plans depicting the facility or site with numbered outfalls which indicate stormwater and
iwastewater outfalls. The plans shall legibly show. at a minimum, (existing or proposed):
o Outline of drainage areas with topographical lines and features o
Stormwaterlwastewater treatment structures
Page 2 of 8
SW U-229-07122011
Last revised 8/2/14

NCG140000 N.O.I.
U
o Location of numbered stormwaterlwastewater outfalls (corresponding to which drainage
areas) o Runoff conveyance structures o Areas and acreage where materials are
stored o Impervious area acreages o Location(s) of streams and/or wetlands the
site is draining to, and any applicable buffers o Site property lines, North Arrow, and bar
scale
o If applicable, the 100-year floodplain line o Acreage of each stormwater and wastewater
topographical area o Each of the facilities' wastewater or stormwater source and discharge
structures and each of its hazardous waste treatment, storage, or disposal facilities
o Site location (insert)
Site plans shall be 24" x 36" in size.
• Line drawing and description: A line drawing of the water flow through the facility. A pictorial description
of the nature and amount of any sources of water and any collection and treatment measures.
• A narrative description and identification of each type of process, operation, or production area which
contributes wastewater to the effluent for each outfall, and a description of the treatment the wastewater
receives (or will receive), including the ultimate disposal of any solid or fluid wastes other than by
discharge. Processes, operations, or production areas may be described in general terms (e.g. "ash silo").
11) Does the applicant have any unresolved Notice of Violations (NOVs)? XNo ❑ Yes
Wastewater.,
12) What types of wastewater does your facility generate or discharge?
Type of Authorized Wastewater
Generate
Discharge
Sent to WW
Treatment
System
Vehicle and equipment cleaning VE
❑
❑
❑
Wettinq of raw material stockpiles RM
X
X
❑
Mixing drum cleaning MD
X
X
❑
Further explanation, if necessary:
13) Will your facility spray -down or actively wet aggregate piles? ❑ No X Yes
14) Does the facility use any of the following on site?
❑ Phosphorus -containing Detergents
❑ Brighteners ❑ Other Cleaning Agents
❑ Non -Phosphorus -containing Detergents
❑ Other:
15) Are wastewater treatment facilities planned in the 100-year flood plain? X No ❑ Yes
• 16) Does your facility use or plan to use a recycle system, or recycle components in your treatment system?
X Yes ❑ No
Page 3 of 8
SWU-229-0712201 t
Last revised 812114

NCG140000 N.O.I.
If yes, what size storm event is the system designed to hold before overflowing? (for example, 10-yr, 24-hr)
year, 24-hr rainfall event
17) Will your facility build a closed -loop recycle system that meets design requirements in 15A NCAC 02T
r
1000 and hold your facilities' working volume ?
❑ Yes XNo
Will your facility discharge wastewater to surface waters?
❑ Yes X No
If the facility's treatment system meets the design requirements of 15A NCACO2T .1000 (including holding
the 25-year, 24-hour storm plus one foot of freeboard), holds the working volume of your site, and does
not discharge wastewater to surface waters, you may not be required to obtain an NPDES permit for
wastewater discharges. If you believe this is the case, please contact DEMLR's Aquifer Protection Section
Land Application Unit Central Office Supervisor or staff (1636 Mail Service Center, Raleigh, NC 27699-1636)
for more information on obtaining the necessary permits or approvals. If you will discharge wastewater or
stormwater to surface waters, please continue to apply for a permit to discharge associated with ready -mixed
concrete or like operations under NCG140000. For further questions, please contact DEMLR's Stormwater
Permitting Unit Staff.
18) A wastewater treatment alternatives review is required by 15A NCAC 2H.0105 (c)(2) for any new or
expanding water pollution control facility's discharge in North Carolina. You may attach additional sheets.
• a) What wastewaters were considered for this alternatives review? ❑ VE ❑ RM ❑ MD
b) Connection to a Municipal or Regional Sewer Collection System:
i) Are there existing sewer lines within a one -mile radius? ..................................... XYes ❑ No
(1) If Yes, will the wastewater treatment plant (WWTP) accept the wastewater? .... ❑ Yes X No If
(a) If No, please attach a letter documenting that the WWTP will not accept the wastewater.
(b) If Yes, is it feasible to connect to the WWTP? Why or why not? No
c) Closed -loop Recycle System (must meet design requirements of 15A NCAC 2'T .1000):
i) Are you already proposing a closed -loop recycle system (CLRS)? ❑ Yes X No
(1) If Yes, contact DEMLR's Aquifer Protection Section's Land Application Unit
(2) If No, is this option technologically feasible (possible)? Why or why not?'
(3) If No, is it feasible to build a CLRS on your site? Why or why not? The temporary concrete plant
will not be on the site long enough to consider this option.
(4) What is the feasibility of building a CLRS compared to direct surface water discharge? This is not
feasible. Please see the answer to question 1813.
Page 4 of 8
SWU-229-07122011 Last revised 8I2I14

NCG 140000 N.O.I.
d) Surface or Subsurface Disposal System (e.g., spray irrigation):
i) Is a surface or subsurface disposal technologically feasible (possible)? .................... ❑ Yes X No
Why or Why not?
ii) Is a surface or subsurface disposal system feasible to implement?* ...........................❑ Yes X No
Why or Why not?
iii) What is the feasibility of employing a subsurface or surface discharge as compared to a direct
discharge to surface waters?*
e) Direct Discharge to Surface Waters: Is discharge to surface waters the most environmentally sound
alternative of all reasonably cost-effective options of the wastewaters being considered?*...X Yes ❑ No ij
If No, contact DEMLR's Land Application Unit to determine permitting requirements.
f) If this review included all wastewater discharge types, would excluding some types (e.g. raw
stockpile wetting) make any of the above non -discharge options feasible?.......X Yes No
* You may be asked to provide further information to support your answers to these questions after the initial review.
Feasibility should take into account initial and recurring costs.
Stormwater:
is 19) Does this facility employ any best management practices for Stormwater control? ❑ No X Yes
If yes, please briefly describe: Retention basins properly sized with diversion ditches.
20) Does this facility have a Stormwater Pollution Prevention Plan? ❑ No X Yes
If yes, when was it implemented? 10/1/2015
21) Are vehicle maintenance activities (VMA) occurring or planned at this facility? X No ❑Yes
If yes, does your VMA area discharge into your wastewater treatment device? ❑ No ❑ Yes
Other/Permitting:
22) Does this facility have a Division of Land Resources Erosion & Sedimentation Control (E&SC) Permit?
❑ No XYes Flatiron Blythe Development
If yes, list the permit numbers for all current E&SC permits for this facility:
23) Is your facility subject to Phase II Post -Construction Area? ❑ Yes X No
If yes, who is the permitting authority?
24) Is your facility located in one of the 20 Coastal Counties? ❑ Yes X No
Is your facility adding more than 10,000 ft2 of built -upon area or CAMA Major Permit? ❑ Yes X No
Page 5 of 8
SWU-229-07122011 Last revised 8/2114

NCG140000 N.O.I.
• 25) Is your facility discharging wastewater (treated or untreated) such as water from wetting of aggregate piles,
n
f�
•
drum rinse -out, or vehicle and equipment cleaning to a stormwater BMP? ❑ No X Yes If
yes, please attach your approval from the permitting authority to do so.
26) 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:
27) 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:
28) 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 ❑ 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) Type(s) of waste:
How is material stored:
Where is material stored:
How many disposal shipments per year:
Name of transport 1 disposal vendor: _
Vendor address:
Final Checklist
This application will be returned as incomplete unless all of the following items have been included:
X Check for $100 made payable to NCDENR.
X This completed application and all supporting documentation. See Question 10,
Page 6 of 8
SWU-229-07122011 Last revised 812114

NCG140000 N.O.I.
s
X 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 V 38).
X Two (2) site plans depicting the site plan with numbered outfalls which indicate stormwater and wastewater
outfalls. See Question 10.
X A county map or USGS quad sheet with location of facility clearly marked.
29) Signatory Requirements (per 40 CFR 122.22)
All applications, reports, or information submitted to the Director shall be signed and certified. a.
All notices of intent to be covered under this General Permit shall be signed as follows:
(1) For a corporation: by a responsible corporate officer. For the purpose of this permit, a responsible corporate officer means: (a) a president,
secretary, treasurer or vice president of the corporation in charge of a principal business function, or any other person who performs similar policy
or decision making functions for the corporation, or (b) the manager of one or more manufacturing production or operating facilities employing
more than 250 persons or having gross annual sales or expenditures exceeding 25 million (in second quarter 1980 dollars), if authority to sign
documents has been assigned or delegated to the manager in accordance with corporate procedures.
(2) For a partnership or sole proprietorship: by a general partner or the proprietor, respectively; or
(3) For a municipality, state, federal, or other public agency: by either a principal executive officer or ranking elected official.
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 discharge(s) and is enforceable in the same manner as an individual
permit.
Page 7 of 8
SWU-229-07122011 Last revised 812114

NCG140000 N.O.I.
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: C h act M
Title: D . ZJr'. C-+ M41}Yge-C _
�7 811 q
(Signature of Applicant) (Date Signed)
Notice of Intent must be accompanied by a check or money order for $100.00 made payable to: NCDENR
Mail the entire package to:
Stormwater Permitting Unit Program
Division of Energy, Mineral and Land Resources
1612 Mail Service Center
Raleigh, North Carolina 27699-1612
Note
The submission of this document does not guarantee the issuance of an NPDES permit.
For questions, please contact the DEMLR Regional Office for your area.
DEMLR 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 .........
[phone]
E�
Page 8 of 8
SWU-229-07122011 Last revised 8/2114

TOPO! map printed on 07/10/15 from "Concret Plant Site.tpo"
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GEOGRAPHIC
07(10/15

LANE
Stormwater Pollution Prevention Plan
For Temporary Concrete Batch Plant
Background
Lane has been contracted to perform 3 miles of interstate concrete paving work for the NCDOT
Greensboro Western Loop project, This project requires that approximately 50,000 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 erected on NCDOT property adjacent to the
roadway alignment. The physical address of this location is 2149 Fleming Road, Greensboro NC
27410.
The concrete plant that is being proposed in this application will exist solely to provide concrete
for the Greensboro Western Loop Construction Project. As scheduled this entire project will be
completed by March 14, 2018 and the concrete plant will be removed in advance of this date. It
is anticipated that this plant will only be in this location for 12 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
0 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 waste water 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 waste water generated at this site is storm water runoff. Currently the site is being
developed by the prime contractor and 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.
0

Page 2
Jul. 22, 15
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 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
10 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 CFID. 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 mgll and 5 m1h respectively), and the
pH will be within the acceptable 6-9 range.
•

Pate 2
Jul. 22, 15
Maintenance of System
iAll water treatment devices will be evaluated on a bi-weekly basis, and after any event resulting in
0.5" 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.
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 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 Davidson County (Lane
Construction, 2011). 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
10

ENC)rTN ERS CERTIFICATION
Or THE MODEL 500o-S PH
MONITORING AND CONTROL SYSTEM
BY-.
G.C, Environmental, Inc.
P.O. Box 40125
Raleigh, NC 27629
For:
rortrans Inc.
P.O. Box 40
Wendell, NC 27591
Dated'
September 11, 2003
0

G. G. Environmental, Inc.
5312 Pinewood Court
Wendell, NC 27591.
[phone]
Scptcmbcr 11, 2003
PURPOSC
G.C. Pnvironmtcntal, Inc., was contracted to provide an engineers review and certification that the
Mode[ 5000-S pH Monitor and Control System manufactured by Coastal Carolina Supply in
Morehead City, INC, could effectively provide on a continuous basis, an average pl-I range of 6-9 units
on the supernato layer of a stormwater/rinse water sedimentation basin typically found at. Itedi-mix
concrcto facilities,
,SCOPE OF WORK
During thcweek ofAugurt 1 1, 2003, G-C. Environmental, Inc„ witnesses! the operation ofthe Model
5000-S self-contained pH M onitoring and Control Systern at a Rzdi-mix plant located in Durham, NC.
During tha two (2) day test program, measurements were- made within the facilities stormwater/rinse
water sedimentation basin for pl-I, temperature and depth (both supernate and sludge), During the firA
day of testing, the basin wa_q lbund to be heavily loaded with solids and adjustments were made to the
solids blanket to complete testing; the following day.
TEST METHODOLOGY
A primary sedimentation basin located at a Rodi-mix concrete plant 10cated in Durham, NC was
treated utilizing the Model 5000-S pH Monitor and Control System, During the lest program, the
basin was, on a semi -continuous basis, being fed rinse water Cram the exterior cleaning of cement
trucks. Measurements for pH, temperature, supernate and sludge blankets were made within the
sedimentation basin, Initial pH measuroments 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 Y at the deepest point. Sludge measurements within the basin
showed that at least 2/3 of the basins depth was comprised of sludge and the remainder supernate.
The Model 5000-S pH Monitor and Contro[ System was setup atthe rectangular sedimantation basin
with the intake and discharge hoses situated at opposite ends of the basin. Both the intake and
discharge finis were sot at depths within the supernate layer of the basin. A clockwise flow pattern
was established once the unit began operation and pat and temperature measurements were made at
several locations throughout the supernate layer of the sedimentation basin. Approximate[y eighteen
(18) pl-I and tcmperat.ure meusiurements were collected with it mean pH value of Ljs and mean
temperature values of;0.94 *C. 'I•he pH system was left to run essentiaOy on a continuous ha.qis over
a four (4) hour period. An estimated volume existing within the sedimentation basin was 25, 000
gallons with a little over 8000 gallons consisting of relatively clear supernate. The amount of 25%
n
L

Sulfuric acid (H,SO,) used to treat the sedimentation basing supernato was approximately 18-20
MODEL 5000-S PFI MONITOR AND CONTROL SYSTEM
The model 5000-S pH Monitor and Control System is comprised of a Hayward Power 1'1ow It (3/4
hp, 56 GPM) centrifugal sump which delivers raw water to a completely contained pH sensor
connected to a pki meter equipped with control relays which operate two (2) stenner (60 GPD) acid
injection pumps. The acid 25% Fl2.S0, is injected into the pump dischargo line which empties into the
sedimentation basin. Sulfuric acid is delivered to the system by 15 gallon earbuoys located outside of
the fiberglass weatherprool'enclosure which houses all of the aforementioned equipment. On top of
the enclosed is an alarm light which is tied into the pH meter which is activated when pH levels exceed
8,5 pH units or are below 6.0 units.
CONCLUSION
1, The Model 5000-S PH Monitor and Control System is an effective system for the pH balancing of
sedimentation basins which are used to collect ,gormwater runoff and rinse water, commonly found
at Red -mix concrete plant;t.
2. During the test program an average pfil of 8.54 Emits was measured in the subject sedimentation
basin with a rungo of 7.95 to 9.34 measured,
3. Sludge levels existing within the rectangular sedimentation ranged from 6.0 inches to 2.0 feet. PH'
vaiucs after pH stabilization at the sludge/supernate interl'ncu were approximately 12,0 units
re 1 4. For thistcst program, approximately 180 mgil of sulfate~ were added to the sedimentation basin as
a result orpH adjustment with 25% sulf"ric acid.
5. Thu 5000-S pH Monitor and Control System is FiAly automated and provides ii pH adjusted waste
water which could eff'cctively be reused within the itedi-mix concrete industry.

r
FORTRANS pH CONTROL SYSTEMS
FORTRANS pH CONTROL SYSTEMS are
completely automatic. They continually monitorltest
the pH of the influent water and compares it to the
pH setting of the control unit. If a change 1n 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 cycle
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 fevei Is maintained.
The pH CONTROL SYSTEMS are designed to
treat and maintain a specified pH level in a body or
water usually 100,000 gallons or less to allow the
permitted discharge of treated water to the
environment. Permits 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
stormwater run off regulations. Treated Water may
aiso be used in water recycling systems.
These systems offers precise monitoring and
control of the pH In settling basins, lagoons and
other outfall containment devices.
•The pH CONTROL SYSTEMS will treat up to
57 gallons per minute - max 20' head pressure.
Uniquo writer 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 1.5" 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.
Fortipa-ins,
FORTRANS, INC. - 7440 b. Vernerie Rd. - Wendell N.G. 27591
1.0BS.365.8760 - 1.919.624.13832
InfoOfartrmns.bls www.fortrans,biz
�•ChViiiastr :i:: Y,�'� • •f r�' , t • ��n- -+,1--_
0
The Modof 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 instrumentatlon and
circulation pump. The system Is configured for carbon
dioxide gas operation_
The Model 5000-SK Skid Mounted pH Control
System contains all of the instrumentation and
components of the regular Model S000-8 System
and Is shipped on a 44X47" 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 an 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 bo inserted after receipt of the Unit.
The system features a 115V-30Amp Breaker Box
and two GFCI receptacles. The system is shipped
with a CO2 feed system.

FORTRANS pH CONTROL SYSTEMS - MODEL 5000-S & 5000--SK
overtr.+d virw
Intake line detail
Wall
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Fortrans..
3000 Original Hnnry RCI„ P.0, BOX 759 • Henry, VR. 2a102 • 077.387.8509 - WWW-1or(rAn9.biZ
Model 5000 S & SK pH Control Systems
INSTALLATION NOTES
1. Connect W hose to hose fitting on the white 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 Whose fittings. (SK Model only)
Note: The CO2 injector is shipped in an upside down position on skid mounted
systems. Tum it to an upright position and tighten union connection. (SK Model)
3, Connect hose fitting on return line to the Hose fitting marked "inlet" on the
sample cell with the %" 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 pH probe.
6. pH probe has been calibrated at the factory, it should be re -calibrated every
weak, See operations manual for calibration instructions.
7. Catalog # 2866-L. ph 4.01 buffer and catalog # 2881-L ph 7 buffer agent are
included, These materials may be re -ordered from Fortrans inc.
S. It may be necessary to Install a "/" PVC ball valve on Intake line in order to fill
line with water 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.
10. Plug the pH Controller into the 1000 joule surge suppressor.
11. Ground pump to copper grounding rod.
12. Position outlet In basin so that the waterfiows 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.
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11
Ar y
bommi
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 fir installation of temporary sediment trap are as follows:
Practice Applies At the outlets of diversions, ofiannels, slope drains, or other runoff
conveyances that discharge sediment -laden water.
• Below areas that are draining S acres or less.
• Where access can be maintained for sediment removal and proper
disposal.
In the approach to a stormwater inlet located below a disturbed area as
part of mi inlet protection system.
• Structure life limited to 2 years.
A temporary sediment trap should not be located in an intermittent or
perconia! stream.
Planning Select locations for sediment traps during site evaluation. Note natural
Cd1151Cjer�tiOrlS drainage divides and select trap sites so that runofrfrorn potential sediment -
producing areas can easily be diverted into the traps., Ensure the drainage
areas for each trap does not exceed S acres. Install temporary sediment traps
before land disturbing takes place withir3 the drainage area.
Mako traps readily accessible for periodic sediment 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
proteet the embankment from fal lure from storm runoff th at exceeds the design
capacity. Locate bypass outlets so that flow will not damage the embaukment.
Direct emergency bypasses to undisturbed natural, stable areas. If a bypass is
not possible and failure would have severe consequences, consider alternative
s ites.
Sediment trapping is achieved primarily by settling within a pool formed by
an embankment. The sediment pool may also be formed by excavation, or by
a combination of excavation and a abaukmment. Sediment -trapping efficiency
is a function of surface area and inflow rate (Practice 6.61. Sedimem Basin).
Therefore, maxintize the surface area In the design. Because porous baffles
improve flow distribution across the basin, high length to width rados 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.
Rcr. 6/M6 6.60.1

i
. , r
1 Design Criteria summary:- Tegiggmry Sedinitnt'nan
Primary Spillway. stone Spillway
MaximumDrainagoArea- 5 acres
Mil mutt Volume: 3600 cubic feet per acre of disturbed area
Minimum Surface Arta; 435 square feet per cfs ofQlo peak inflow
Minimum L IW Ratio: 2:1
Minimum Depth: 3.5 fret, 1.5 feet excavated below grade
Maximum Height: Weir elevation 3.5 feet above grade
Deivatering Mechanism: Stone Spillway
Minimum DewateringTime: NIA
13at3ies Required: 3
Storage capacity —Provide a minimum volume of 3600 iF/acre 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.
map cleauout--Rcmove codlniont• from the trap, mid rextore the capacity
to original trap dimensions when sediment has accumulated to one-half the
design depth.
Tirap efflcieucy--The follo►ving design elements most be provided for
adequate trapping efficiency:
Provide a surface area of 0.01 acres (435 square feet) per cfs based on the
I0-year storm;
Convey runoff into the basin through stable diversions or temporary slope
drains;
f
• 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, Porous Baffles);
• Excavate 1.5 feet of the depth of the basin below grade, and provide
mUrmun storage depth of2feet above grade,
6.60.2
Embankment —Ensure that embankments for temporary sediment traps do
not exceed 5 feet in height. Measure from the center line ofthe 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 die embankment height to allow flow through a designated
bypass location. Construct embankments with a minimum top width of 5 feet
and side slopes of 2:1 or flatter. Machine compact embankments.
Taeavation Where sediment pools are formed or enlarged by excavation,
keep side slopes at 2:1 or flatter for safety.
Outlet section —Construct the sediment trap outlet using a stone section of
the embankment located of the low point in the basin. The stone section serves
t►wa purposes: (1) the top section serves as a non -erosive spillway outlet for
flood flows; and (2) the bottom section provides a means of dcwatering the
basin bettiween rUnDff events.
Stone size —Construct the outlet using well -graded stones with a d" size of 9
inches (Class B erosion control stone is recommended,) and a maximum stone
Ilea. 6106

'
Practice Standards and Spec yicafions
size of 14 inches. The entire upstream face of the rock struchire should be
covered with fine gravel (NCDOT #57 or #5 wash stone) a minimutu of 1 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, keep the sides of the spillway at least 21 inches
thick.
Depth —Tire basin should be excavated 1.5 feet below grade.
Stone spillway height —The sediment storage depth should be a minimntn of
2 fact and a maximum of 3.5 feet above grade.
Protection &am 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 pcak discharge of the 10-year storm (Figure 6.60a). A roaximutn
flow depth of six inches, a minimum freeboard of I foot, aril maximum side
slopes of2:1 are recommended. Weir length may be selected ftom Fable 6.60a
shown for most site locations in North Carolina.
Cross -Section 12'mi of MOT#5 �--� n
or# washed stone �. - --------- --_---_---____-- __-
1.5' min.
3600 cu ftlocre
• 1 mer
filter.
fabric
Design settled
7
Plan View
r
A)
�:. _.fit t {.�.,���-" �tLtt '�
4 . r
1�
-. � «:.' ��••fzy`<' � ��,�-�
pass
6settle' below
top of
dam
Iter
Cbric
min.
Figure 6.60a Flan view and cross-section view of a temporary sediment trap.
Rev. 6106
6.60.3

1�0
6.60.4
A
Table 6.60a
Design -of Spillways
Drainage Area Weir Length'
(acres) (ft)
1 4.0
2 6.o
3 e.0
4 10.0
5 12.0
' Dimensions shown are minimum.
Construction 1. Clear, grub, and strip the area under the embankment of all vegetation and
SPO'cif cations root mat. Remove all surface soil containing high amounts of organic matter,
and stock -pile or dispose of it properly. Haul all objectionable material to the
designated disposal area.
2. Ensure that fill material for the em6anlauent Is flee of roots, woody
vegetation, organic matter, and other objectionable material. Place the fill in
lifts not to exceed 9 inches, and machine compact it. -Ovet fi ll the embankment
6 inches to allow for settlement.
3. Construct the outlet section in the embankment. Protect the connection
between the rlprap and the soil from piping by using filter fabric or a 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 ofthe dam. The trench should be at
least 2 feet deep and 2 feet wide with J: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. Ensure that the stone (drainage) ssetlon of the embankment has a
minimtun bottom width of 3 feet and maximum side slopes of 1.1 that extend
to the bottom ofthe 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 tiro over f311cd
embankment. Keep the thickness of the sides of the spillway outlet structure
at a minimtun of 21 Inches, The weir must be level and constructed to
grade to assure deslgn capaclty.
S. Material used in the stone section should beawell-gradcdmixture ofstonc
with a duo size of 9 inches (class 8 erosion control stone is recommended) and
a maximum stone size of 141nches. The stone maybe machine placed and the
smaller stones worked Into the voids ofthe larger stones. The stone should be
hard, angular, and higbJy weather -resistant.
9. Discharge inlet water into the basin in a manner to prevent erosion. Use
temporary slope drains or diversions with outlet protection to divert sediment -
laden water to the upper end of the pool area to Improve basin trap efficiency
(References: I'ri a:off Control h-fsaslari and Qtrllet Pt otectlon).
Rev. 6106

O
<J
Rtv. 6106
Practice Standards and Specifications
10. Eusure that the stone sp ivay 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 the 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 (Refernces:
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 in the field.
14. Install porous baffles as specified in Practice 6.65, Porous Baffles.
Maintenance Inspect temporary sediment traps at ]cast rvmMy and after each significant (Y2
Inch or greater) rainfall event and repair immediately. ]remove sediment, and
restore the trap to its original dimensions when the sediment has accumulated
to oae-halfthe 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
unpaired by sediment.
Check the structure for damage from erosion or piping. Periodicafly check the
depth of the spillway to ensure it Is a nunhinn of 1.5 feet below time low point
of the- embankment: Immediately fill any settlement of the embankment to
slightly above design grade. Any r1pr2p displaced from the spillway must
be replaced immediately.
After all sediment -producing areas have been permanently stabilized, remove
the stnmcturc and all unstable sediment. Smooth the area to blend with the
adjoining areas, and stabilize properly (References: Srnface Stabilization).
References armlet 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)
Srqface Stabilization
6.10, Temporary Seeding
6.I1, Permanent Seeding
6.15, Riprap
Sediment 7Yrqv and Ban•iers
6,61, Sediment Basins
6.64, Slumrucr Basins
6.65, Porous Baffies
North Carolina Depm?ment of 7Fm7sparlation
Standard Specifications for Roads and Structures
6.60.5

PROJECT: Greensboro Eastern Urban Loop Project
SUBJECT / TASK: Calculate Stormwater Runoff from Concrete Plant Site & Design Treatment System
CALCULATED BY: DJS
DATE: 8/14/2015
11
I-]
The Lane Construction Corp. has proposed to construct and operate a temporary portable concrete
match 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 tc _ [L3/H]o.385/128 (Malcom)
L = 562 Ft. Hydraulic length of watershed
H = 19 Ft. Elevation change along length
tc = 3.8 Minutes Minimum tt = 5 minutes
tc (min) = 5.0 Minutes Use Minimum tc:
Calculate Peak Flow Rate ( Q
Impervious Plant Yard & Driveways
Q =CiA
C = 0.9 *Rational Coefficient -Table 1.6 NCDOT Design Manual
i = 6.8 in/hr *Rainfall Intensity - Appendix A NCDOT Design Manual
Greensboro 10yr, 5-Minute Storm
A = 3 AC Drainage Area, Impervious
Q imp = 18.36 CFS
Pervious Surrounding Grassed Areas
C = 0.5 *Rational Coefficient - Table 1.6 NCDOT Design Manual
i = 6.8 in/hr *Rainfall Intensity - Appendix A NCDOT Design Manual
Greensboro 10yr, S-Minute Storm
A = 0 AC Drainage Area, Pervious
Q Per= 0 CFS
Q10 Total = 18.36 CFS
Drainage Area = 3 AC Select Skimmer Basin
*(NCDOT BMP Selection & Design Criteria Chart)
Page 1 of 5

Calculate Basin Design Minimums
Storage Volume =
1800 CF/AC *NCDOT Guidelines
Min. Capacity =
5400 CIF
Surface Area =
325Q10 SF *NCDOT Guidelines
Min. Surface Area =
5967 5F
lected BMP Basin
Top Dimensions * Bottom Dimensions
Length: 135 Ft Length: 123
Width: 45 Ft Width: 33
Depth: 3 Ft (At Weir) * Skimmer Requires Minimum 3:1 L:W Ratio
Side Slopes: 2 :1 (H:V)
SURFACE AREA = 6075 SF Basin Size is: Good
RETENTION VOLUME = 15129 Basin Volume is: Good
TER BASIN
Depth to Dewater 2 FT
is Volume to Dewater: 10,086 CF
Basin to Dewater in: 3 Days * NCDOT Guidelines
Outflow = 3362 CF/Day
�10
7 SKIMMER
Skimmer Size = 2.5 Inch * Faircloth Skimmer Selection Chart
H = 0.208
RIFICE
D = 1.79 Inch D = SQRT(Q/(2310SQRT(H)))
R = 0.89 Inch
'BARREL SIZE
Qbarrel= 17.46 GPM
4" Barrel will Suffice * Figure C-1 (NCDOT Manual)
Page 2 of 5

L11
0
•
EMERGENCY SPILLWAY
Spillway Width:
Confirm Suitability with
Weir Equation:
37 Ft * NCDOT Method (Basin Width - 8')
20.77 FT GOOD
COMPLETED STORMWATER BASIN DESIGN
Basin Size:
Basin Drainage Area:
Skimmer Size:
Orifice Radius:
Outflow Barrel:
Spillway Width:
135Ft x 45Ft x 3Ft
3 AC
2.5 IN
0.89 IN
4 IN
37 FT
Page 3 of 5

•
•
•
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.
01na111=20C rat ULIC� all ZO'JCI IUCU III aLLJI r11 V9dLC1
Drainage Area: Smallest Avg. Particle Diameter Avg. Particle Diameter
Particle (Microns) (Ft)
Plant Yard "very Fine Sand" 50 1.64E-04
"Silts" 30 9.84E-05
Grass Field "Avg. to Lg. Clays" 2 6.56E-06
JCLL111% I IIIIC %.G11LU10L1U11D
Very Fine Sand : 5.04E-03 ft/sec
Silts : 1.09E-03 ft/sec
Avg. to Large Clays : 4.84E-06 ft/sec
Itttectiveness of
Settling Time Achieved by Basin: 3 Days
Depth of Basin 3 Ft *
Percentage of "Fine Sands" Settled Out
Percentage of Silts Settled Out:
Percentage of Avg. to Large Clays Settled Out:
V=gd2(pl-p2)/18µ *
* Used a Typical Density for each type of
Particle
* Skimmer Designed to Dewater
top 2' in 3 Days
100.00 %
100.00
62.75 %
Page 4 of 5

e
0
9
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.
'►.
IP
is-
r '
SU-,L
036091
J _ s CHV
its
Page 5 of 5

THE LANE CONSTRUCTION CORPORATION
6125 TYVOLA CENTRE DR.
CHARLOTTE, NC 28217
66-7V531 1054
Date
ollarS
FIFTH THIRD-13ANK r /
For 5 iM C[Jlu&r /��/`�►►.� o K � nv

E
•
PROJECT: U-2524
DESCRIPTION: Greensboro Western Urban Loop
SUBJECT/TASK: Calculate "Wash Water" Volume from Concrete Plant Operations & Design Treatment System
CALCULATED BY: RML
DATE: 7/20/2015
UhJective:
Lane Construction 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
Production per Day:
2000
CY
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
plant setup:
100
GAM
Total Wash Water Needed Per Shift:
23,333
Gallons
Fresh Wash Water Introduced to System:
17,500
Gallons * ( 7S% Fresh Water }
Wash Water "Recycled" from Wash Pit:
5,833
Gallons * ( 25% Recycled Water )
Truck Cleaning Wash Water
2,339
ft3
Introduced to System per Day:
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
140
3
Introduced to System per Day:
ft
TOTAL WASH WATER INTRDUCED per Day:
2,480
ft3
I * Denotes Information Provided by Lane Construction, based on project projections and past measurements)I
Page 1 of 8

•
e
•
♦.dPLuIdVc %.v111Nwn1U13 YYdDn rraLcI
Estimate Amount of Waste Concrete
Volume of Waste Concrete Washed
out of Haul Trucks (Per Each}: 100
Lbs. * *Provided by Lane Construction, based
upon past measurements and recent
Volume �f Waste Concrete Washed
125
Lbs. * experience in North Carolina.
out of Mixing Drum (Per Each):
Total Waste Concrete Dumped
2D,375
Lbs.
into Washout Pit per Day:
Typical Mix Design for this Plant Setup:
Cement: 14%
* Provided by Lane Construction,
Fine Agg: 29%
based upon recent History in North
Course Agg: 49%
Carolina.
Water: 8%
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

•
0
Setup and Detail of Treatment System
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 see the 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 200' of undisturbed grass field prior to reaching its receiving water, which is an
unnamed tributary of the Cape Fear River Basin.
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

40
•
•
BASIN 1 - "WASHOUT PIT"
Select Treatment Device (BMP Device)
TRSD - Type 8
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

U
•
Ketention i ime Froviaea
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
Ketention i rme Kequirea to -)eiiie the Average cement rarticie
Particle Settling Velocity
V=gd2(pl-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/ft'
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
Cement Particle: 2.29E-04 ft/sec
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 5 of 8

•
is
•
Analyze Settlement of Particles too Fine to Completely Settle uut
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 Grain Size Dlstributlon Analysis
NIST Study}
Diameter
(microns)
Size
distribution
<
Amount in
System
(Lbs)
Diameter (Ft)
Settling Velocity
(Ft/Sec)
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 T
1.31E-05
1.63E-05
2.13
6
7.6
29.9
210.60
1.97E-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.
5ettling Required to Ettectively "Trap" Suspended Particles
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

•
0
s
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 by
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
290.96
100.00%
290.96
100.00%
0.00
16
227.22
100.00%
227.22
100.00%
0.00
24
382.40
100,00%
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
Laiculate Amouni or �uspenaea t_emeni z)ettieu in oasin a
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
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
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

E-1
•
•
Calculate Maximum Daily TSS Levels in outflowine Wash Water
Total Suspended Cement Discharged from System: 1.97 Lbs. +`•• CA'R•,,,�
Water Discharged from System: 18,755 Gal
�FESSlpM
J.
Amount of Suspended Cement in Outflowing Wash Water: 1.05E-04 Lbs./Gal Ate; -Q� �t
1 mg/L = 8.35E-06 Lbs./Gal SEAL
036091
Daily TSS: 12.56 mg/L `+
Maximum Allowable per NCDENR Regulations: 30 mg/L 1Q HAS'
•
4bI111l1" �
SYSTEM IS: Acceptable
Notes:
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 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 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.
Page 8 of 8