NCG140041_COMPLETE FILE - HISTORICAL_20140411

PERMIT NO.
DOC TYPE
DOC DATE
STORMWATER DIVISION CODING SH
NCG PERMITS
5( HISTORICAL FILE
❑ MONITORING REPORTS
aoi`I 'oy ) I
YYYYMMDD

A
NCDENR
North Carolina Department of Environment and Natural Resources
Pat McCrory
Governor
Mr. Johnie Alexander
Concrete Supply Co., LLC
P.O. Box 5247
Charlotte, NC 28299
Dear Mr, Alexander:
John E. Skvarla, III
Secretary
April 11, 2014
Subject: NPDES General Permit NCG140000
Certificates of Coverage —See attached list
Concrete Supply Co., LLC
Formerly Concrete Supply Co.
Counties - Multiple
Division personnel received your request to revise your stormwater permit Certificates of
Coverage to accurately reflect your new company and/or facility name.
Please find enclosed the revised Certificates of Coverage for the 17 facilities that changed
ownership from Concrete Supply Co to Concrete Supply Co., LLC. The terms and conditions
contained in the General Permit remain unchanged and in full effect. These revised Certificates
of Coverage are issued under the requirements of'North Carolina General Statutes 143-2I5.1
and the Memorandum of Agreement between North Carolina and the U.S. Environmental
Protection Agency.
If you have any questions or need further information, please contact the Stormwater Permitting
Program at [phone].
Sincerely,
OR161NAL 81GNW W
KEN PICKLE
for Tracy E. Davis, P.E., CPM, Director
Division of Energy, Mineral and Land Resources
cc: Mooresville RO, Z. Khan; Winston-Salem RO, M. Gantt (NCG140358)
Stormwater Permitting Program Files
Deborah Reese, DEMLR Budget Office -- please update billing info
Central Files
Mecklenburg County DEP, Water Quality, 700 N, Tryon Street, Charlotte, NC 28202
Division of Energy. Mineral, and Land Resources
Energy Section - Geological Survey Section - Land Quality Section
1612 Mail Service Center, Raleigh, North Carolina 27699-1612.919-707-92001 FAX: [phone]
512 North Salisbury Street, Raleigh, North Carolina 27604 - Internet: hUp:llportal.ncdenr.org/webllr/
An Equal Opportunity 1 Affirmative Action Employer — 50% Recycled 110% Post Consumer Paper

STATE OF NORTH CAROLINA
DEPARTMENT OF ENVIRONMENT AND NATURAL RESOURCES
DIVISION OF ENERGY, MINERAL, AND LAND RESOURCES
GENERAL PERMIT NO. NCG140000
CERTIFICATE OF COVERAGE No. NCG140041
STORMWATER 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,
Concrete Supply Co., LLC
is hereby authorized to discharg4stormwater from a facility located at
liorat'es s and
Concrete Supply Co. — North Plant
3823 Raleigh St
Charlotte
Mecklenburg County
to receiving waters designated as unnamed tributary to Little Sugar Creek, a class C water in the
Catawba River Basin, in accordance with the effluent limitations, monitoring requirements, and
other conditions set forth in Parts I, II, III, IV, V, and VI of General Permit No. NCG 140000 as
attached.
This certificate of coverage shall become effective April 11, 2014.
This Certificate of Coverage shall remain in effect for the duration of the General Permit.
Signed this day April 11, 2014
for Tracy E. Davis, P.E., Director
Division of Energy, Mineral, and Land Resources
By the Authority of the Environmental Management Commission
KA i—
¢�i,/,�-

°� WA
o� rF� pG
r
Mr. Loren Wild
Concrete Supply Company
3823 Raleigh Street
Charlotte, North Carolina 28299
Dear Mr. Wild:
Michael F. Easley, Governor
William G. Ross Jr., Secretary
North Carolina Department of Environment and Natural Resources
Coleen H. Sullins, Director
Division of Water Quality
January 18, 2008
Subject: Authorization to Construct
Concrete Supply Co. Charlotte North plant
NCG140041
Mecklenburg County
The Division of Water Quality (DWQ) received your request to construct stormwater and
wastewater controls at the subject facility on or about March 16, 2007. In accordance with your
request, you are authorized to construct the approved control facilities, effective today. I
apologize for the lengthy delay on my desk.
Authorization is hereby granted for the construction and installation of a treatment system
consisting of: a concrete multiple chamber wash water recycle system and truck wash pad, a
Fortrans automated pH correction unit installed on the final chamber of the recycle system, a
portable pump to convey treated wastewater from the final sedimentation chamber to the existing
clearwell, an existing recycle pump and recycle line to deliver treated wastewater from the
clearwell to the batch plant water supply tank, an overflow box, a stormwater and wastewater wet
detention basin with two forebays and overflow structure, and other related incidental features, all
in the configuration and location shown on the approved plans and details, and per the description
in the design narrative submitted to DWQ.
Typically we would require that you notify DWQ's Mooresville Regional Office supervisor, telephone
number [phone], at least 48 hours in advance of operation of the finished facilities so that
regional office staff can conduct an in -place inspection prior to any wastewater discharge. Such
notification to the regional supervisor would be made during the normal office hours from 8:00
a.m. until 5:00 p.m. on Monday through Friday, excluding state holidays. In this instance,
because of the delay on my desk, and since the facilities have already been completed, please
contact the regional office for. a post -construction inspection this month.
Similarly, upon completion of construction, you must submit a certification from a professional
engineer certifying that the controls have been constructed and installed in accordance with the
NPDES general permit requirements in NCG140000, the Certificate of Coverage NCG140041, this
Authorization to Construct, and the approved site plan, details, and calculations. Please mail the
engineer's certification to DWQ Stormwater Permitting Unit, 1617 Mail Service Center, Raleigh,
North Carolina 27699-1617. Our Authorization to Construct is subject to revocation unless the
control facilities are constructed in accordance with the approved plans, details, and design
narrative.
You must maintain on file a copy of the approved plans, details, and design narrative for the life of
the facility.
AlurrAurally
r!!f
North Carolina Division of Water Quality 1617 Mail Service Center Raleigh, NC 27699-1617 Phone [phone] Customer Service
Internet: Www.ncwater]cualit oru Location: 512 N. Salisbury St. Raleigh,NC 27604 Fax [phone]
An Equal Opportunity/Affirmative Action Employer — 50% Recycled/10% Post Consumer Paper

Mr. Loren Wild
Page 2 of 3
January 18, 2008
In the event that the controls fail to perform satisfactorily, including the creation of nuisance
conditions, you must take immediate corrective action, including those actions as may be required
by this Division, such as the construction of additional or replacement controls.
Failure to abide by the requirements contained in this Authorization to Construct may subject the
Permittee to an enforcement action by DWQ, in accordance with North Carolina General Statute
143-215.6A to 143-215.6C.
This Authorization to Construct does not affect the legal requirements to obtain other permits or
authorizations that may be required by DWQ, or other federal, state, or local government
agencies.
Please contact Ken Pickle at [phone] x 584, with any comments or questions.
Sincerely,
P
Coleen H. Sullins
Attachment: Engineer's Certification
Enclosure: Approved plans and details
cc: Trigon Eng., 313 Gallimore Dairy Rd, Greensboro, NC 27409, letter only
DWQ Mooresville Regional Office, approved,set
DWQ Central Files, letter only
.SPU file NCG140041, approved set'

Mr. Loren Wild
,... Page 3 of 3
January 18, 2008
Engineer's Certification
I, ._ �, as a duly registered Professional Engineer in the State
of North Carolina, have to observed (periodically, weekly, full time) the construction of
the project,
Project Name
Location
for the Permittee. I hereby state that, to the best of my abilities, due care and diligence
was used in the observation of the construction and installation of a truck rinse and drum
wash water recycle system, an automated pH control system, a truck wash pad, and
related incidental features such that the construction was observed to be built within
substantial compliance and intent of the approved plans, details, and calculations.
Signature
Registration No.
Date
Mail this Certification to: Stormwater Permitting Unit.
NC Division of Water Quality
1617 Mail Service Center
Raleigh, NC 27699-1617

ATC review for NCG14O041, Concrete Supply Co., Charlotte North plant
1/18/08
kbp
Conclusion on above review date: Issue ATC letter
Review notes
1. Submittal parts
a. Design plans, design details, design narrative, design calcs, submitted by
Trigon ooa 3/16/07.
b. Design concept misdirected; discussed with Loren Wild (CSC) and Todd
Phillips (Trigon); despite misunderstanding design objective, probably
sufficient, due to large volumes provided.
2. Given lengthy delay on KSP's desk, and since construction has been completed,
suggest we treat as a DWQ/kbp problem, not as a non-compliance problem by the
permittee.
3. Submittal review:
a. Property lines shown? Yes
b. Stamped and dated? Yes
c. Outfalls located? Yes
d. Sufficient topography and detail to show how stormwater and wastewater are
generated, directed, conveyed, captured, and treated? Yes
e. Features:
i. Fortrans automated pH correction unit
ii. Wash pad, multiple -bay recycle system, clearwell, recycle into mix
iii. Truck rinse, drum wash, agg drainage, and loading wash all drain to
recycle system. Ok
iv. Wet detention basin for site stormwater (drainage area 1) and for any
overflow from recycle (drainage area 2). Ok in this circumstance.
v. Intended operation of recycle system is to take all wastewater back to
the mix. Occasional overflows are automatically pH corrected. TSS
removal not shown in the submittal, but between recycle system and
wet detention basin it's likely that TSS will be removed to permit
levels, In these circumstances, issue ATC.
4. Design basis/design details review: Sediment removal seems to not have been
considered in design; TSS limits not shown; hybrid system with TSS settling in both
recycle system and wet detention basin. Ok in these circumstances.
END

FOV
ENGINEERING CONSULTANTS, INC.
www.trigotietig.com
P.O. Box 18846 • Zip 27419-8846. 313 Gallimore Dairy Road • Greensboro, NC27409 • p 336,668,0093 • f 336.668.3868
March 16, 2007
Mr. Ken Pickle
NCDENR
Stormwater Permitting Unit
512 N. Salisbury Street
Raleigh, NC 27604
Reference: Concrete Supply Company _
North Charlotte Concrete Plant AIC(:, 146041) '4i
Charlotte, NC
Dear Mr. Pickle:
Attached please find three (3) copies of the storm water treatment system plans for the Concrete
Supply Company, North Charlotte Concrete Plant in Charlotte, NC. We have also included three (3)
copies of the storm water sizing calculations for the storm water treatment basin and the site wet
detention basin. The basins were designed to have a volume equal to the 10 year 24 hour storm water
runoff volume for the area draining to the basin.
w �7swa7ar was rr X-b Afi-
The truck washout area and other process is included in the 6torm—xater treatment
basin area and is also designated on the plans. We have reused the existing plant clearwell to recycle
the water in the treatment system to the concrete plant. Water will be pumped as required from the last
cell of the water treatment basin to the clearwell with a pump. The existing purr ing�tem will be
used.to pump from the clearwell to the batch plant water su ply tank see lans We have also shown
V/a pH adjustment system to keep the pH in the last cell Bove the NPDES le e! for discharge, in case
all of the water generated cannot be used in t e concrete atc plant proces and needs to discharge
from the site. The water discharging would have to be tes ed to insure the T S requirements of the
NPDES permit are met with the proposed treatment basin A settlement enh ncing chemical could be
added if the treatment system does not perform as well as xpected.
The remainder of the site storm water is designed to be
Please review the plans, and let us know if you have any
Sincerely,
CONSULTANTS, INC.
C. Jennings II, P.E.
cc: I Loren Nd - Coa6rete Supply Company
with a wet detention pond BMP.
ments.
WOO
fUw1PS naT Mlnt�t.�r7
Trigon Engineering Consultants, Inc.

Concrete Supply Co, Charlotte North plant
Subject: Concrete Supply Co, Charlotte North plant
From: Ken Pickle <[e-mail]>
Date: Fri, 18 Jan 2008 12:01:07 -0500
To: [e-mail]
CC: Loren Wild <[e-mail]>, Samar Bou-Ghazale
<[e-mail]>
Hi Todd,
I've changed my approach on the Charlotte North plant since our telephone
conversation this morning. You and others are still welcome to come over here
Wednesday to review the submittal with me if you wish, it may still be instructive.
However, I'm going to issue the Authorization to Construct today, anyway. I realize
that you operate on a billable hour basis, so determine for yourself if you still
wish to meet with me.
Several factors contributed to my decision to move ahead now:
a) Primarily, if operated as portrayed in the narrative, I think the system has a
good chance of meeting permit limits on TSS and pH. [Neither the design narrative
nor the supporting talcs fully make the case for compliance with the permit limits on
TSS, but in the absence of sufficient engineering argument, my intuitive assessment
of the construction drawings and partial design calculations is that the system will
probably work to achieve the TSS permit limit. My sense is that the pH limit is
assured if the automated Fortrans unit is installed on the final sediment chamber.
Loren - Please note that the Fortrans unit needs to be on the final sediment chamber,
not on the clearwell - the drawings are somewhat ambiguous on this point.]
b) The fact that the system is already built makes me willing to go with what is in
place, to see how it works out for TSS. This is a worrisome precedent for me, but I
will be caught up this month, and I don't foresee having to deal again with the
complications to our ATC process caused by my lengthy delays.
c) Of all the ready -mixed concrete producers we have dealt with, Concrete Supply
Company has mounted the broadest effort to take a critical look at their facilities.
I have some confidence that their commitment will continue if we subsequently find
that the constructed facility is inadequate, and that we need to make follow-up
modifications.
d) And finally, and not insignificantly, I'm
progress on my personal backlog that I can.
desk today, rather than in a couple of weeks.
Ken
interested in making every bit of
It suits me to have this project off my
1 of 1 1/18/2008 12:02 PM

0 L�
STRUCTURE SCHEDULE
STRUCTURE
INV IN
INV IN
INV OUT
TOP ELEV
TYPE
S-1
-.
686.0
_
CONCRETEF.E.S.
1-2
688.8
688.7
693.7
2'-0" X 3.0°
GRATE INLET
1-3
689.6
_
689.5
693.5
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GRATE INLET
1-4
_
_
690.7
693.7
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-
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686.0
-
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1-6
-
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694.4
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GRATE INLET
CORRUGATED
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686.0
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ALUMINUM PIPE
F.E.S.
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_
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686.5
_
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(SEE DETAILS)
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TREATMENT SYSTEM NOTES:
V/ 1. ALL OF THE TRUCK WASHDOWN AREA AND DRUM WASHOUT FLOW SHALL BE DIVERTED TO TREATMENT SYSTEM.
2. TREATMENT BASIN SHALL BE CLEANED OUT BI-WEEKLY TO RE-ESTABLISH DESIGN VOLUME (MORE OFTEN IF ,.f jl, /
REQUIRED). MAXIMUM 1'-0" OF MATERIAL TO BE ALLOWED TO ACCUMULATE IN TREATMENT BASIN.
3. WATER SHALL BE PUMPED FROM TREATMENT BASIN TO THE CLEARWELL (WITH A PORTABLE PUMP) TO MAINTAIN
WATER REQUIRED FOR CONCRETE BATCHING. (APPROXIMATELY 3500 GALLONS/DAY) N/F
KHALID MAL ASFAR
4. WATER SHALL BE PUMPED FROM CLEARWELL TO WATER SUPPLY TANK FOR CONCRETE BATCHING. \ 01 DB 12546 PG 801 _
' 5. OVERFLOWS OF TREATMENT BASIN SHALL REQUIRE pH ADJUSTMENT PRIOR TO DISCHARGE, IF REQUIRED. pH }/' ' •'� � ..�!j �,,. - � `F� N�
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ADJUSTMENT SYSTEM SHALL OPERATE AT ALL TIMES TO KEEP pH IN THE RANGE REQUIRED FOR DISCHARGE BY THE r f ��' k- oo, METROMONT PRESTRESS COMPANY
F� PLANT NPDES PERMIT. �,r / 6g1 , : r/ f f q o �, OB 9426 PG 410
6. TSS SHALL BE AT OR BELOW THE TSS LIMIT REQUIRED BY THE PLANT NPDES PERMIT. . = ; �@' t G/S# 091-08-106
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7. AFTER STORM EVENT GREATER THAN 2-INCHES OF RAINFALL, TREATMENT BASIN SHALL BE CHECKED FOR pH AND vj 25 , .'-•- - "- "�' r " t S-5 ^ � '-
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SHALL BE PUMPED TO WET DETENTION POND FOREBAY FOR DISCHARGE. TANK SHALL BE DRAINED AND SEDIMENT r 'TRIP RAP `����
SHALL BE CLEANED OUT WITHIN 24 HOURS, AFTER pH AND TSS ARE ACCEPTABLE FOR DISCHARGE. f r> (SEE DETAiI�
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8. PRIOR TO AN ANTICIPATED STORM EVENT OF 2-INCHES OR GREATER, TREATMENT BASIN SHALL BE CHECKED FOR r 41 (SEE DIL) RIP -RAP CHANNEL
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pH AND TSS. ONCE BOTH PARAMETERS ARE IN COMPLIANCE WITH NPDES PERMIT, WATER NOT ANTICIPATED TO BE .,,. ,,�:����CROS
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TRItN
TRIGON ENGINEERING CONSULTANTS, I_NC.
313 GLLIMORE DAIRY ROAD
GREENSBORO, NC 27409
PHONE: [phone] FAX: [phone]
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SITE PLAN
STORM WATER
SEDIMENT AND
EROSION
CONTROL PLAN
CONCRETE SUPPLY
NORTH CHARLOTTE
3823 RALEIGH STREET
CITY OF CHARLOTTE
MECKLENBURG COUNTY,
NORTH CAROLINA
HORZ. SCALE: 1" = 30'
VERT. SCALE: NIA
DESIGNED BY: PCJ
DRAWN BY: AOS
CHECKED BY: PCJ
DATE: 20OMl 26
PROJECT NUMBER: 018.06-016
DRAWING
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10' WEIR
SHEAR GATE
PRECAST CONCRETE TOP DETAIL
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BOX
SD MANHOLE FRAME 8, COVER
USF 3610 RING &
USF 5640 GRATE
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10' OUTLETWEIR
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33.5'
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SHEAR GATE
10' WEIR
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TOP OF EXTERIOR WALL
EL=695.5'
WEIR
/ EL=694.5'
OUTLET WEIR DETAIL
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TOP OF WALL
INTERIOR WALL EL=694.75'
EXTERIOR WALL EL=695.5'
WEIR
EL=693.5'
WEIR DETAIL
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OVERFLOW BOX
TOP OF COVER = 696.0'
OVERFLOW WEIR = 694.5'
18" RCP TO POND
TOP OF WALL = 695.5'
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(he boom wa11. Zi
Rcwm Una Is iastailed of istchor
side of"Ir. Pate. with
1 11T.
optioa
BOTTOM OF BASIN=685.75' pH CONTROL SYSTEM DETAIL
NOT TO SCALE
TYPICAL EXTERIOR
WALL SECTION
TOP OF WALL = 694J&
BOTTOM OF BASIN = 685.75'
TYPICAL INTERIOR
WALL SECTION
TOP OF WEIR = 693.75'
TYPICAL WEIR SECTION
TOP OF EXTERIOR WALL
EL=695.5'
EDGE OF FLUME
EL=694.0' CL OF FLUME
t_ EL=693.5'
J
FLUME INLET DETAIL
CONCRETE SEDIMENT BASIN DETAILS
NOT TO SCALE
BOTTOM OF BASIN = 685.75'
7116" HOLES SPACED 60" APART
ON 10.375" DIX BOLT CIRCLE
3W PVC belt
velvc to tataliuttc
easy p imim of
PWW
I W" cw lode
�taclr a
"'Belau *'afl
- 37"
USF-4137-6237
CB-2000 1/2" 24'
V4887
1-3/4"
7" �� 7"
33 3J4"
21-3/4"
36-3/4"
24-,V4"
43-3/4"
31-314"
35 /4"
2-3/4° 7/8' � � � � 1�/8" 1-314"
CAPACITY 3" - 5.0 cfs
6"-7.0cfs
9" - 8.75 Cfs
12" -10.0 Cfs
HANDLE
ADJUSTABLE LOCK HOOK WITH
LOCK SCREW, (OPTIONAL)
1" ROD OR EXTRA -STRENGTH TUI
VARIABLE LENGTH.
LIFT HANDLE
0
0
FRONT SECTION
LIFT HANDLE SHALL BE ATTACHED
PER MANUFACTURER'S
RECOMMENDATIONS.
31-314"
2'X3' GRATE AND FRAME (HEAVYWEIGHT)
NOT TO SCALE
NOTES:
1. SHEAR GATE SHALL BE ALUMINUM ALLOY PER ASTM B-26-ZG-32a OR CAST IRON ASTM A48 CLASS 30B.
2. GATE SHALL BE JOINED TO TEE SECTION BY BOLTING (THROUGH FLANGE).
3, LIFT ROD: AS SPECIFIED BY MFR. - HANDLE SHALL EXTEND TO WITHIN ONE FOOT OF SEDIMENT BASIN
TOP OF WALL (WITH GATE CLOSED).
4. NEOPRENE RUBBER GASKET REQUIRED BETWEEN TEE MOUNTING FLANGE AND GATE FLANGE.
5. MATING SURFACES OF LID AND BODY TO BE MACHINED FOR PROPER FIT.
6. FLANGE MOUNTING BOLTS SHALL BE 30 DWM. STAINLESS STEEL.
7. ALTERNATE CLEANOUT/SHEAR GATES EQUAL TO THE DESIGN SHOWN ARE ACCEPTABLE,
PROVIDED THEY MEET THE MATERIAL SPECIFICATIONS ABOVE AND HAVE A SIX BOLT, 10 3/8" BOLT
CIRCLE FOR CONNECTION TO THE FLANGE.
8. PROVIDE ROD GUIDES PER MANUFACTURER SPECIFICATIONS.
9. SHEAR GATE INVERT TO BE 6 INCHES ABOVE BOTTOM SLAB.
Z
ih
PROPOSED TOP OF WALL = 695.5'
TOP OF EXISTING WALL = 694,7'
f- � �"
1 I
N
DRILL AND EPDXY #4 (d 12" O/C
EXISTING CLEARWELL WALL EXTENSION DETAIL
NOT TO SCALE
SHEAR GATE DETAIL
NOT TO SCALE
SEE PLAN
FOR ELEVATION
EXISTING OR PROPOSED
CONCRETE
PAVEMENT
2'X3'
51-314" ---- r
PLAN
SECTION A -A
FRAME = 240 ibs.
GRATE = 216 lbs.
9-13116"
23-3/4"
NOTES:
BRICK MASONRY SHALL BE
COMMON CLAY BRICK, JUMBO
BRICK, OR CONCRETE BRICK.
ALL MORTAR JOINTS ARE
TO BE117+118".
PRECAST STRUCTURES
MAY BE SUBMITTED TO
ENGINEER FOR
APPROVAL. WAFFLE
BOXES WILL NOT BE
APPROVED FOR THIS USE.
BRICK MASONRY DROP INLET FOR 2'x3' GRATE
NOT TO SCALE
10, SEE PLAN
/ FOR ELEVATION
SEE PLAN
FOR ELEVATION
THICKNESS TO BE
SAME AS EXISTING
CONCRETE PAVEMENT
CONCRETE FLUME DETAIL
NOT TO SCALE
EXISTING OR PROPOSED
CONCRETE
PAVEMENT
Al
Cc
re8
rul
In;
ph
-stc
Pe
by.
TRIiN
TRIGON ENGINEERING CONSULTANTS, INC.
313 GALLIMORE DAIRY ROAD
GREENSBORO, NC 27409
PHONE: [phone] FAX: [phone]
4
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all
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`AC A / gyp
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QFESS �W�i0
SEAL
20842
_
•
C.
1
rovad' y OOCUMer,�;
truction in accordance with these documents is
ired by the stormwater permit. North Carolina
A require that the stormwater system designer
act dunng _ronstruct'ow certify conformity with th -
and specs."
NC Mvision of Wator .ualtty
SITE PLAN
NOTES & DETAILS
CONCRETE SUPPLY
NORTH CHARLOTTE
3823 RALEIGH STREET
CITY OF CHARLOTTE
MECKLENBURG COUNTY,
NORTH CAROLINA
HORZ. SCALE: N/A
VERT. SCALE: WA
DESIGNED BY: PCJ
DRAWN BY: AOS
CHECKED BY: PW
DATE: 2007-01-26
PROJECT NUMBER: 018-06-016
DRAWING
C 0,4
Qo 1�C MAP
J tU

6" EQUALLY SPACED 6' - TRASH RACK
MAX SPACING 12" (SEE DETAIL)
% ATOP WEIR EL E TOP WEIR EL E
4 °
FLOW EL D OVERFLOW
d °
G
lid
°d
° d
ORIFICE #1
Q
PERMANENT POOL EL B PERMANENT PO
ORIFICE #1
PROVIDE MH STEPS
Y-2" ON CENTER 8" KNIFE GATE VALVE
WITH HANDWHEEL.
v HANDWHEEL SHALL
8" POND OUTLET PIPE EXTEND ABOVE NORMAL
DRAIN (SEE PLAN) POOL ELEVATION V-0"
MINIMUM.
INVERT F
EXPANDED
BASE
INVERT
BOTTOM STR I .T`UR A
„ 8" POND DRAIN
SECTION A A
POND RISER DETAIL
NOT TO SCALE
co
io
ao
I 81. 1 - 6' --- 1 8" L.-
PRECAST CONCRETE TOP DETAIL
NOT TO SCALE
TEMPORARY
SEDIMENT
STORAGE
AANHOLE FRAME & COVER
3610 RING &
5640 GRATE
is
EQUALLY SPACED 6„
TRASH RACK
(SEE DETAIL)
1/2 WEIR
G
OPENING
6" MAX. SPACING 12"
HEIGHT
„
H
°
° v
a
°
PIPE CONNECTION TO RISER
B
WATER QUALITY
°
SHALL BE WATERTIGHT
OUTLET PIPE
°
a
ORIFICE #1 (SEE DETAIL)
(TO BE PLUGGED DURING
4
(SEE PLAN)
EROSION CONTROL PHASE)
'
8" POND DRAIN
<
r--INVERT F
u KEY INTO
= BASE (TYP)
�J
I_ J
SECTION B-B
POND RISER DETAIL
NOT TO SCALE
PROVIDE MH STEPS--\
d
ORIFICE #1--,
B
L
:r
I 6�
EL = 688.0
•isr -�
aim --
�
•�
(It\11
• •
•
• -
■
. deo =12" CLOTH
RIPRAP BAFFLE
NOT TO SCALE
d_j
PLAN VIEW (FROM TOP)
NOT TO SCALE
EL = 686.0
TOP OF RISER
693.8 27'
692.7
�-692.3
100 YR. STORM ELEV.
0 YR.-STORM
ELE1?
WEIR ELEVATION = 692.3 -
2 YR. STORM
ELEV.
_
691.3
4
3 6 11 '
89.0
POND
PERMANENT
WATER
-- fi87.0
RIP RAP QUALITY STORAGE T0" DRAIN
/ �--- 686.0
BAFFLE
686.0
i I
685.5
PERMANENT
INV IN = 686.0
SEDIMENT
STORAGE
PERMANENT WET DETENTION
POND CROSS SECTION
NOT TO SCALE
`-------EXPANDED BASE
B
_OUTLET
PIPE
a
° a
SCHEDULE
STORM WATER MANAGEMENT PONDS
SCHEDULE40
,.
40PVC
CONSTRUCTION SPECIFICATIONS
PVC
SLEEVE
ELBOW
'
SITE PREPARATION
AREAS DESIGNATED FOR BORROW AREAS, EMBANKMENT, AND STRUCTURAL WORKS SHALL BE CLEARED, GRUBBED AND STRIPPED OF TOPSOIL. ALL TREES, VEGETATION, ROOTS AND OTHER
o
OBJECTIONABLE MATERIAL SHALL BE REMOVED. CHANNEL BANKS AND SHARP BREAKS SHALL BE SLOPED TO NO STEEPER THAN 1: 1. ALL TREES SHALL BE CLEARED AND GRUBBED WITHIN 15
FEET OF THE TOE OF THE EMBANKMENT. AREAS TO BE COVERED BY THE RESERVOIR WILL BE CLEARED OF ALL TREES, BRUSH, LOGS, FENCES, RUBBISH AND OTHER OBJECTIONABLE MATERIAL
°
UNLESS OTHERWISE DESIGNATED ON THE PLANS. TREES, BRUSH, AND STUMPS SHALL BE CUT APPROXIMATELY LEVEL WITH THE GROUND SURFACE. FOR DRY STORM WATER MANAGEMENT
Z
8 WALL
PONDS, A MINIMUM OF A 25-FOOT RADIUS AROUND THE INLET STRUCTURE SHALL BE CLEARED. ALL CLEARED AND GRUBBED MATERIAL SHALL BE DISPOSED OF OUTSIDE AND BELOW THE LIMITS
6
a
OF THE DAM AND RESERVOIR AS DIRECTED BY THE OWNER OR HIS REPRESENTATIVE. WHEN SPECIFIED, A SUFFICIENT QUANTITY OF TOPSOIL WILL BE STOCKPILED IN A SUITABLE LOCATION FOR
6
°
USE ON THE EMBANKMENT AND OTHER DESIGNATED AREAS.
EARTH FILL
A.MATERIAL - THE FILL MATERIAL SHALL BE TAKEN FROM APPROVED DESIGNATED BORROW AREAS. IT SHALL BE FREE OF ROOTS, STUMPS, WOOD, RUBBISH, STONES GREATER THAN 6", FROZEN
DETAIL WATER QUALITY ORIFICE #1
OR OTHER OBJECTIONABLE MATERIALS. FILL MATERIAL FOR THE CENTER OF THE EMBANKMENT, AND CUT OFF TRENCH SHALL CONFORM TO UNIFIED SOIL CLASSIFICATION GC, SC, CL, MH, OR
MIL AND MUST HAVE AT LEAST 30% PASSING THE #200 SIEVE AND A PLASTICITY INDEX OF AT LEAST 15. CONSIDERATION MAY BE GIVEN TO THE USE OF OTHER MATERIALS IN THE EMBANKMENT
NOT TO SCALE
IF DESIGNED BY A GEOTECHNICAL ENGINEER. SUCH SPECIAL DESIGNS MUST HAVE CONSTRUCTION SUPERVISED BY A GEOTECHNICAL ENGINEER. MATERIALS USED IN THE OUTER SHELL OF
THE EMBANKMENT MUST HAVE THE CAPABILITY TO SUPPORT VEGETATION OF THE QUALITY REQUIRED TO PREVENT EROSION OF THE EMBANKMENT.
B.PLACEMENT- AREAS ON WHICH FILL IS TO BE PLACED SHALL BE SCARIFIED PRIOR TO PLACEMENT OF FILL. FILL MATERIALS SHALL BE PLACED IN MAXIMUM 8 INCH THICK (BEFORE
COMPACTION) HORIZONTAL LAYERS WHICH ARE TO BE CONTINUOUS OVER THE ENTIRE LENGTH OF THE FILL. THE MOST PERMEABLE BORROW MATERIAL SHALL BE PLACED IN THE
DOWNSTREAM PORTIONS OF THE EMBANKMENT. THE PRINCIPAL SPILLWAY MUST BE INSTALLED CONCURRENTLY WITH FILL PLACEMENT AND NOT EXCAVATED INTO THE EMBANKMENT.
m
qJ
C. COMPACTION - THE MOVEMENT OF THE HAULING AND SPREADING EQUIPMENT OVER THE FILL SHALL BE CONTROLLED SO THAT THE ENTIRE SURFACE OF EACH LIFT SHALL BE TRAVERSED BY
u�
NOT LESS THAN ONE TREAD TRACK OF HEAVY EQUIPMENT OR COMPACTION SHALL BE ACHIEVED BY A MINIMUM OF FOUR COMPLETE PASSES OF A SHEEPSFOOT, RUBBER TIRED OR
m m
VIBRATORY ROLLER. FILL MATERIAL SHALL CONTAIN SUFFICIENT MOISTURE SUCH THAT THE REQUIRED DEGREE OF COMPACTION WILL BE OBTAINED WITH THE EQUIPMENT USED. THE FILL
g
112 WEIR OPENING 1 /4 X 4 BOLTS
MATERIAL SHALL CONTAIN SUFFICIENT MOISTURE SO THAT IF FORMED INTO A BALL IT WILL NOT CRUMBLE, YET NOT BE SO WET THAT WATER CAN BE SQUEEZED OUT. THE MINIMUM REQUIRED
cry
EMBEDDED IN
DENSITY SHALL NOT BE LESS THAN 95% OF MAXIMUM DRY DENSITY WITH A MOISTURE CONTENT WITHIN -1 % TO +3% OF THE OPTIMUM. EACH LAYER OF FILL SHALL BE COMPACTED AS
°
(0 MAX 12" (USE 2 BARS
CONCRETE
NECESSARY TO OBTAIN THAT DENSITY, AND IS TO BE CONFIRMED BY THE ENGINEER AT THE TIME OF CONSTRUCTION. ALL COMPACTION IS TO BE DETERMINED BY ASTM D 698 (STANDARD
9"
IF WEIR OPENING IS
PROCTOR).
GREATER THAN 24")
D. CUT OFF TRENCH - THE CUTOFF TRENCH SHALL BE EXCAVATED INTO IMPERVIOUS MATERIAL ALONG OR PARALLEL TO THE CENTERLINE OF THE EMBANKMENT AS SHOWN ON THE PLANS. THE
BOTTOM WIDTH OF THE TRENCH SHALL BE GOVERNED BY THE EQUIPMENT USED FOR EXCAVATION, WITH THE MINIMUM WIDTH BEING FOUR FEET. THE DEPTH SHALL BE AT LEAST FOUR FEET
•
•
BELOW EXISTING GRADE OR AS SHOWN ON THE PLANS. THE SIDE SLOPES OF THE TRENCH SHALL BE 1 TO 1 OR FLATTER. THE BACKFILL SHALL BE COMPACTED WITH CONSTRUCTION
a
EQUIPMENT, ROLLERS, OR HAND TAMPERS TO ASSURE MAXIMUM DENSITY AND MINIMUM PERMEABILITY.
E. EMBANKMENT CORE - THE CORE SHALL BE PARALLEL TO THE CENTERLINE OF THE EMBANKMENT AS SHOWN ON THE PLANS. THE TOP WIDTH OF THE CORE SHALL BE A MINIMUM OF FOUR
EQUALLY
6„
iv
FEET. THE HEIGHT SHALL EXTEND UP TO AT LEAST THE 10 YEAR WATER ELEVATION OR AS SHOWN ON THE PLANS. THE SIDE SLOPES SHALL BE 1 TO 1 OR FLATTER. THE CORE SHALL BE
'
SPACED
COMPACTED WITH CONSTRUCTION EQUIPMENT, ROLLERS, OR HAND TAMPERS TO ASSURE MAXIMUM DENSITY AND MINIMUM PERMEABILITY. IN ADDITION, THE CORE SHALL BE PLACED
°
1/4" X 4"
12" (MAX)
1" (TYP)
CONCURRENTLY WITH THE OUTER SHELL OF THE EMBANKMENT.
BOLTS (TYP)
EMBEDDED
•
STRUCTURE BACKFILL
IN CONCRETE
2" (TYP)
A.BACKFILL ADJACENT TO PIPES OR STRUCTURES SHALL BE OF THE TYPE AND QUALITY CONFORMING TO THAT SPECIFIED FOR THE ADJOINING FILL MATERIAL. THE FILL SHALL BE PLACED IN
..
HORIZONTAL LAYERS NOT TO EXCEED FOUR INCHES IN THICKNESS AND COMPACTED BY HAND TAMPERS OR OTHER MANUALLY DIRECTED COMPACTION EQUIPMENT. THE MATERIAL NEEDS TO
FILL COMPLETELY ALL SPACES UNDER AND ADJACENT TO THE PIPE. AT NO TIME DURING THE BACKFILLING OPERATION SHALL DRIVEN EQUIPMENT BE ALLOWED TO OPERATE CLOSER THAN
FOUR FEET, MEASURED HORIZONTALLY, TO ANY PART OF A STRUCTURE. UNDER NO CIRCUMSTANCES SHALL EQUIPMENT BE DRIVEN OVER ANY PART OF A CONCRETE STRUCTURE OR PIPE,
6"
UNLESS THERE IS A COMPACTED FILL OF 24" OR GREATER OVER THE STRUCTURE OR PIPE.
" WALL
•
• •
B.STRUCTURE BACKFILL MAY BE FLOWABLE FILL MEETING THE REQUIREMENTS OF NCDOT. THE MIXTURE SHALL HAVE A 100-200 PSI; 28 DAY UNCONFINED COMPRESSIVE STRENGTH. THE
°
T
FLOWABLE FILL SHALL HAVE A MINIMUM PH OF 4.0 AND A MINIMUM RESISTIVITY OF 2,000 OHM -CM. MATERIAL SHALL BE PLACED SUCH THAT A MINIMUM OF 6" (MEASURED PERPENDICULAR TO
THE OUTSIDE OF THE PIPE) OF FLOWABLE FILL SHALL BE UNDER (BEDDING), OVER AND, ON THE SIDES OF THE PIPE. IT ONLY NEEDS TO EXTEND UP TO THE SPRING LINE FOR RIGID CONDUITS.
1" X 1/2" WELDED
AVERAGE FLOW DIAMETER OF THE FILL SHALL BE AT LEAST 8-INCHES TO ASSURE FLOWABILITY OF THE MATERIAL, ADEQUATE MEASURES SHALL BE TAKEN (SAND BAGS, ETC.) TO PREVENT
ALUMINUM BARS (TYP)
FLOATING THE PIPE. WHEN USING FLOWABLE FILL, ALL METAL PIPE SHALL BE BITUMINOUS COATED. ANY ADJOINING SOIL FILL SHALL BE PLACED IN HORIZONTAL LAYERS NOT TO EXCEED FOUR
INCHES IN THICKNESS AND COMPACTED BY HAND TAMPERS OR OTHER MANUALLY DIRECTED COMPACTION EQUIPMENT. THE MATERIAL SHALL COMPLETELY FILL ALL VOIDS ADJACENT TO THE
FLOWABLE FILL ZONE. AT NO TIME DURING THE BACKFILLING OPERATION SHALL DRIVEN EQUIPMENT BE ALLOWED TO OPERATE CLOSER THAN FOUR FEET, MEASURED HORIZONTALLY, TO ANY
TRASH RACK DETAIL
PART OF A STRUCTURE. UNDER NO CIRCUMSTANCES SHALL EQUIPMENT BE DRIVEN OVER ANY PART OF A STRUCTURE OR PIPE UNLESS THERE IS A COMPACTED FILL OF 24" OR GREATER
NOT TO SCALE
OVER THE STRUCTURE OR PIPE. BACKFILL MATERIAL OUTSIDE THE STRUCTURAL BACKFILL (FLOWABLE FILL) 'LONE SHALL BE OF THE TYPE AND QUALITY CONFORMING TO THAT SPECIFIED FOR
THE CORE OF THE EMBANKMENT OR OTHER EMBANKMENT MATERIALS.
PIPE CONDUITS
INSTALL COLLAR WITH
ALL PIPES SHALL BE CIRCULAR IN CROSS SECTION.
CORRUGATIONS VERTICAL COLLAR TO BE SAME GAGE AS THE
A. CORRUGATED ALUMINUM PIPE
PIPE LVITH WHICH IT IS USED.
7
1. PIPE MATERIALS
ALUMINUM PIPE - THIS PIPE AND ITS APPURTENANCES SHALL CONFORM TO THE REQUIREMENTS OF AASHTO SPECIFICATION M-196 OR M-211 WITH WATERTIGHT COUPLING BANDS OR
FLANGES. ALUMINUM PIPE, WHEN USED WITH FLOWABLE FILL OR WHEN SOIL AND/OR WATER CONDITIONS WARRANT FOR INCREASED DURABILITY, SHALL BE FULLY BITUMINOUS COATED
CONTINUOUS
PER REQUIREMENTS OF AASHTO SPECIFICATION M-190 TYPE A. ALUMINUM SURFACES THAT ARE TO BE IN CONTACT WITH CONCRETE SHALL BE PAINTED WITH ONE COAT OF ZINC
WELD
1/2" x 2" SLOTTED HOLES FOR 3/8"
CHROMATE PRIMER OR TWO COATS OF ASPHALT. HOT DIP GALVANIZED BOLTS MAY BE USED FOR CONNECTIONS. THE PH OF THE SURROUNDING SOILS SHALL BE BETWEEN 4 AND 9,
DIAMETER BOLTS
2. COUPLING BANDS, ANTI -SEEP COLLARS, END SECTIONS, ETC., MUST BE COMPOSED OF THE SAME MATERIAL AND COATINGS AS THE PIPE, METALS MUST BE INSULATED FROM DISSIMILAR
_
MATERIALS WITH USE OF RUBBER OR PLASTIC INSULATING MATERIALS AT LEAST 24 MILS IN THICKNESS,
O
3. CONNECTIONS - ALL CONNECTIONS WITH PIPES MUST BE COMPLETELY WATERTIGHT. THE DRAIN PIPE OR BARREL CONNECTION TO THE RISER SHALL BE WELDED ALL AROUND WHEN
w
THE PIPE AND RISER ARE METAL. ANTI -SEEP COLLARS SHALL BE CONNECTED TO THE PIPE IN SUCH A MANNER AS TO BE COMPLETELY WATERTIGHT. DIMPLE BANDS ARE NOT CONSIDERED
6
PIPE
TO BE WATERTIGHT. ALL CONNECTIONS SHALL USE A RUBBER OR NEOPRENE GASKET WHEN JOINING PIPE SECTIONS. THE END OF EACH PIPE SHALL BE RE -ROLLED AN ADEQUATE
o
t= O O 0. D. C) � �
NUMBER OF CORRUGATIONS TO ACCOMMODATE THE BANDWIDTH. THE FOLLOWING TYPE CONNECTIONS ARE ACCEPTABLE FOR PIPES LESS THAN 24 INCHES IN DIAMETER:
IN
SPACE INCLUDING PIPE
SPACE
a. FLANGES ON BOTH ENDS OF THE PIPE WITH A CIRCULAR 318 INCH CLOSED CELL NEOPRENE GASKET, PRE -PUNCHED TO THE FLANGE BOLT CIRCLE, SANDWICHED BETWEEN
„
8" CC
2„
2"
A -+--
8" CC
2"
12" MIN.
ADJACENT FLANGES;
b. 12-INCH WIDE STANDARD LAP TYPE BAND WITH 12-INCH WIDE BY 3/8-INCH THICK CLOSED CELL CRCULAR NEOPRENE GASKET;
a
0
0 O
2
-
C. 12-INCH WIDE HUGGER TYPE BAND WITH O-RING GASKETS HAVING A MINIMUM DIAMETER OF 112 INCH GREATER THAN THE CORRUGATION DEPTH.
a
PIPES 24 INCHES IN DIAMETER AND LARGER SHALL BE CONNECTED BY A 24 INCH LONG ANNULAR CORRUGATED BAND USING A MINIMUM OF 4 (FOUR) RODS AND LUGS, 2 ON EACH
a1,
CONNECTING PIPE END. A 24-INCH WIDE BY 3/8-INCH THICK CLOSED CELL CIRCULAR NEOPRENE GASKET WILL BE INSTALLED WITH 12 INCHES ON THE END OF EACH PIPE. FLANGED JOINTS
WITH 3/8 INCH CLOSED CELL GASKETS THE FULL WIDTH OF THE FLANGE IS ALSO ACCEPTABLE. HELICALLY 'ORRUGATED PIPE SHALL HAVE EITHER CONTINUOUSLY WELDED SEAMS OR HAVE
Uj
III
LOCK SEAMS WITH INTERNAL CAULKING OR A NEOPRENE BEAD.
4. BEDDING - THE PIPE SHALL BE FIRMLY AND UNIFORMLY BEDDED THROUGHOUT ITS ENTIRE LENGTH. WHERE ROCK OR SOFT, SPONGY OR OTHER UNSTABLE SOIL IS ENCOUNTERED, ALL
SUCH
SUCH MATERIAL SHALL BE REMOVED AND REPLACED WITH SUITABLE EARTH COMPACTED TO PROVIDE ADEQUATE SUPPORT,
CONTINUOUS
METAL
S. BACKFILLING SHALL CONFORM TO "STRUCTURE BACKFILL" SECTION.
WELD
SHEET WELDED TO
WELD BOTH SIDES
6. OTHER DETAILS (ANTI -SEEP COLLARS, VALVES, ETC.) SHALL BE AS SHOWN ON THE DRAWINGS.
A
CENTER OF BAND
B. REINFORCED CONCRETE PIPE - ALL OF THE FOLLOWING CRITERIA SHALL APPLY FOR REINFORCED CONCRETE PIPE:
I. PIPE MATERIALS - REINFORCED CONCRETE PIPE SHALL HAVE BELL AND SPIGOT JOINTS WITH RUBBER GASKETS AND SHALL EQUAL OR EXCEED ASTM C-361.
2. BEDDING - REINFORCED CONCRETE PIPE CONDUITS SHALL BE LAID IN A CONCRETE BEDDING /CRADLE FOR THEIR ENTIRE LENGTH. THIS BEDDING ! CRADLE SHALL CONSIST OF HIGH
SEE POND PROFILE FOR WIDTH SECTION A -A
SLUMP CONCRETE PLACED UNDER THE PIPE AND UP THE SIDES OF THE PIPE AT LEAST 50% OF ITS OUTSIDE DIAMETER WITH A MINIMUM THICKNESS OF 6 INCHES. WHERE A CONCRETE
"STRUCTURE
CRADLE IS NOT NEEDED FOR STRUCTURAL REASONS, FLOWABLE FILL MAY BE USED AS DESCRIBED IN THE BACKFILL" SECTION OF THIS STANDARD. GRAVEL BEDDING IS NOT
PERMITTED.
3. LAYING PIPE - BELL AND SPIGOT PIPE SHALL BE PLACED WITH THE BELL END UPSTREAM. JOINTS SHALL BE MADE IN ACCORDANCE WITH RECOMMENDATIONS OF THE MANUFACTURER
OF THE MATERIAL, AFTER THE JOINTS ARE SEALED FOR THE ENTIRE LINE, THE BEDDING SHALL BE PLACED SO THAT ALL SPACES UNDER THE PIPE ARE FILLED. CARE SHALL BE EXERCISED
ELEVATION OF UNASSEMBLED COLLAR
TO PREVENT ANY DEVIATION FROM THE ORIGINAL LINE AND GRADE OF THE PIPE. THE FIRST JOINT MUST BE LOCATED WITHIN 4 FEET FROM THE RISER.
4. BACKFILLING SHALL CONFORM TO "STRUCTURE BACKFILL".
5. OTHER DETAILS (ANTI -SEEP COLLARS, VALVES, ETC.) SHALL BE AS SHOWN ON THE DRAWINGS.
C.PLASTIC PIPE- THE FOLLOWING CRITERIA SHALL APPLY FOR PLASTIC PIPE:
NOTES FOR COLLARS:
I. PIPE MATERIALS
1. ALL MATERIAL TO BE IN ACCORDANCE WITH CONSTRUCTION AND CONSTRUCTION MATERIAL SPECIFICATIONS.
a. PVC PIPE SHALL BE PVC-1120 OR PVC-1220 CONFORMING TO ASTM D-1785 OR ASTM D-2241.
b. CORRUGATED HIGH DENSITY POLYETHYLENE (HDPE) PIPE, COUPLINGS AND FITTINGS SHALL CONFORM TO THE FOLLOWING: 4" -10" INCH PIPE SHALL MEET THE REQUIREMENTS
2. WHEN SPECIFIED ON THE PLANS, COATING OF COLLARS SHALL BE IN ACCORDANCE WITH CONSTRUCTION AND CONSTRUCTION
OF AASHTO M252 TYPE S, AND 12' THROUGH 24" INCH SHALL MEET THE REQUIREMENTS OF AASHTO M294 TYPE S. JOINTS AND CONNECTIONS TO ANTI -SEEP COLLARS SHALL BE
MATERIAL SPECIFICATIONS.
COMPLETELY WATERTIGHT.
2. BEDDING -THE PIPE SHALL BE FIRMLY AND UNIFORMLY BEDDED THROUGHOUT ITS ENTIRE LENGTH. WHERE ROCK OR SOFT, SPONGY OR OTHER UNSTABLE SOIL IS ENCOUNTERED, ALL
3. UNASSEMBLED COLLARS SHALL BE MARKED BY PAINTING OR TAGGING TO IDENTIFY MATCHED PAIRS.
SUCH MATERIAL SHALL BE REMOVED AND REPLACED WITH SUITABLE EARTH COMPACTED TO PROVIDE ADEQUATE SUPPORT.
3. BACKFILLING SHALL CONFORM TO "STRUCTURE BACKFILL".
4. THE LAP BETWEEN THE TWO HALF SECTIONS AND BETWEEN THE PIPE AND THE CONNECTING BAND SHALL BE CAULKED WITH
4. OTHER DETAILS (ANTI -SEEP COLLARS, VALVES, ETC.) SHALL BE AS SHOWN ON THE DRAWINGS.
ASPHALT MASTIC AT TIME OF INSTALLATION.
D. DRAINAGE DIAPHRAGMS - WHEN A DRAINAGE DIAPHRAGM IS USED, A REGISTERED PROFESSIONAL ENGINEER WILL SUPERVISE THE DESIGN AND CONSTRUCTION INSPECTION.
5. EACH COLLAR SHALL BE FUIRNISHED WITH TWO 1/2" DIAMETER RODS WITH STANDARD TANK LUGS FOR CONNECTING
CONCRETE
COLLARS TO PIPE.
CONCRETE SHALL MEET THE REQUIREMENTS OF NCDOT AND SHALL BE A MINIMUM OF 3000 PSI.
ROCK RIPRAP
CORRUGATED METAL ANTI -SEEP COLLARS
ROCK RIPRAP SHALL MEET THE REQUIREMENTS OF NCDOT. GEOTEXTILE FABRIC SHALL BE PLACED UNDER ALL RIPRAP AND SHALL MEET THE REQUIREMENTS OF NCDOT.
NOT TO SCALE
CARE OF WATER DURING CONSTRUCTION
ALL WORK ON PERMANENT STRUCTURES SHALL BE CARRIED OUT IN AREAS FREE FROM WATER. THE CONTRACTOR SHALL CONSTRUCT AND MAINTAIN ALL TEMPORARY DIKES, LEVEES,
COFFERDAMS, DRAINAGE CHANNELS, AND STREAM DIVERSIONS NECESSARY TO PROTECT THE AREAS TO BE DCCUPIED BY THE PERMANENT WORKS. THE CONTRACTOR SHALL ALSO FURNISH,
INSTALL, OPERATE, AND MAINTAIN ALL NECESSARY PUMPING AND OTHER EQUIPMENT REQUIRED FOR REMOVAL OF WATER FROM VARIOUS PARTS OF THE WORK AND FOR MAINTAINING THE
EXCAVATIONS, FOUNDATION, AND OTHER PARTS OF THE WORK FREE FROM WATER AS REQUIRED OR DIRECTED BY THE ENGINEER FOR CONSTRUCTING EACH PART OF THE WORK. AFTER
HAVING SERVED THEIR PURPOSE, ALL TEMPORARY PROTECTIVE WORKS SHALL BE REMOVED OR LEVELED AND GRADED TO THE EXTENT REQUIRED TO PREVENT OBSTRUCTION IN ANY DEGREE
WHATSOEVER OF THE FLOW OF WATER TO THE SPILLWAY OR OUTLET WORKS AND SO AS NOT TO INTERFERE IN ANY WAY WITH THE OPERATION OR MAINTENANCE OF THE STRUCTURE. STREAM
DIVERSIONS SHALL BE MAINTAINED UNTIL THE FULL FLOW CAN BE PASSED THROUGH THE PERMANENT WORKS. THE REMOVAL OF WATER FROM THE REQUIRED EXCAVATION AND THE
FOUNDATION SHALL BE ACCOMPLISHED IN A MANNER AND TO THE EXTENT THAT WILL MAINTAIN STABILITY Of THE EXCAVATED SLOPES AND BOTTOM REQUIRED EXCAVATIONS AND WILL ALLOW
SATISFACTORY PERFORMANCE OF ALL CONSTRUCTION OPERATIONS. DURING THE PLACING AND COMPACTING OF MATERIAL IN REQUIRED EXCAVATIONS, THE WATER LEVEL AT THE LOCATIONS
BEING REFILLED SHALL BE MAINTAINED BELOW THE BOTTOM OF THE EXCAVATION AT SUCH LOCATIONS WHICH MAY REQUIRE DRAINING THE WATER SUMPS FROM WHICH THE WATER SHALL BE
PUMPED.
STABILIZATION
ALL BORROW AREAS SHALL BE GRADED TO PROVIDE PROPER DRAINAGE AND LEFT IN A SIGHTLY CONDITION ALL EXPOSED SURFACES OF THE EMBANKMENT, SPILLWAY, SPOIL AND BORROW
AREAS, AND BERMS SHALL BE STABILIZED BY SEEDING, LIMING, FERTILIZING AND MULCHING IN ACCORDANCE WITH THE SEEDING SPECIFICATIONS AS SHOWN ON THE ACCOMPANYING
DRAWINGS.
EROSION AND SEDIMENT CONTROL
8' MIN r- CONSTRUCTION OPERATIONS WILL BE CARRIED OUT IN SUCH A MANNER THAT EROSION WILL BE CONTROLLED AND WATER AND AIR POLLUTION MINIMIZED. STATE AND LOCAL LAWS
-� .694.0 (SETTLED TOP OF DAM) CONCERNING POLLUTION ABATEMENT WILL BE FOLLOWED. CONSTRUCTION PLANS SHOW THE DETAILED EROSION AND SEDIMENT CONTROL MEASURES REQUIRED.
Ri•' 2.0 INCH DIAMETER
WATER QUALITY
ORIFICE AT 689.0
5
j:5'
10'
PROPOSED 41 LF -42" CAP
3 - ALUMINUM ANTI -SEEP COLLARS T-6" X 7'-0"
WITH WATER -TIGHT SEAL TO BARREL.
EXISTING SLOPE
INV OUT = 686.0
PERMANENT OUTLET
PROTECTION. SEE
DETAIL
POND RISER
ORIFICE
OUTLET
A
B
D
E
F
G
H
I
J
K
#1
PIPE
POND
686.0
2,00"
689.0
692.3
693.3
42"
Mo
5'-0"
5'-0"
T-0"
T-0"
12"
RISER NOTES:
1, POND RISER MAYBE PRECAST CONCRETE. CONTRACTOR TO PROVIDE PRECAST DETAILS FOR REVIEW BY ENGINEER.
2. CONTRACTOR TO PROVIDE REINFORCING STEEL DETAILS FOR RISER SIGNED & SEALED BY A PROFESSIONAL STRUCTURAL
ENGINEER REGISTERED IN NORTH CAROLINA.
!7
T"1�11'�C�N
TRIGON ENGINEERING CONSULTANTS INC.
313 GALLIMORE DAIRY ROAD
GREENSBORO, NC 27409
PHONE: [phone] FAX: [phone]
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__._ _._.__.._._..- NC Division Of t,3 Qual'
Put #_ Revislgn Date- ..
SITE PLAN
NOTES & DETAILS
CONCRETE SUPPLY
NORTH CHARLOTTE
3823 RALEIGH STREET
CITY OF CHARLOTTE
MECKLENBURG COUNTY,
NORTH CAROLINA
HORZ. SCALE: WA
VERT. SCALE: N/A
DESIGNED BY: PCJ
DRAWN BY: ADS
CHECKED BY: PCJ
DATE: 2007-0126
PROJECT NUMBER: 018-06-016
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Approved Stormwater Permit Documents
Construction in accordance with these documents is
required by the stormwater permit. North Carolina
rules require that the stormwater system designer
Inspect during construction; certify conformity with the
plans and specs; aAd ee0ify _oempliefies_ with 4 e
Permit # — .,.— , ¢�..._.. , 'Dato + 'l 6 if
by NC Division of ater Quality
Sheet # Revision Data
1 Concrete Supply — North Charlotte Plant
Storm Water Management, ' Storm
Drainage, and Erosion Control
' March 16, 2007
Trigon Project No. 018-06-016
' Mc�I4a,o4(�

Concrete Supply Company —Worth Charlotte Plant March 16, 2007
' Charlotte, North Carolina Trigon Project No. 018-06-016
Table of Contents
Table of Contents ............................................... ..... ..... ........ 1
INTRODUCTION........................................................................................................................................ 2
STORM WATER MANAGEMENT............................................................................................................ 2
Water Quality Design Methodology...................................................................................................... 3
Water Quantity Design Methodology.................................................................................................... 3
Water Quantity Design Computations....................................................................................................3
STORMDRAINAGE DESIGN................................................................................................. ...........4
EROSIONCONTROL DESIGN.................................................................................................................. 4
SWIM BUFFER REQUIREMENTS............................................................................................................ 4
FEMA FLOOD PLAIN REQUIREMENTS................................................................................................. 4
REFERENCES............................................................................................................................................. 5
Exhibits
#1 —Location Map........................................................................................................................................ 6
'
#2 —NPDES Permit (NC General Permit #NCO 140000)...........................................................................
7
#3 — Storm Water Management Drainage Area Map..................................................................................
43
#4 — Water Quality Design Computations..................................................................................................
44
' Wet Detention Pond.............................................................................................................................
45
StormWater Treatment Basin..............................................................................................................
46
45— Wet Detention Pond Proposed RCN Computations............................................................................
50
96 — Wet Detention Pond Storm Water Quantity Computations................................................................
52
'
Proposed Time of Concentration..........................................................................................................
53
Peak Runoff Computation Sheet..........................................................................................................
54
Elevation -Storage
55
'
................................................................................................................................
2 Year Routing . .
56
10 Year Routing .......................... .........................................................................................................
59
100 Year Routing.......................................................................... .............
62
' 47 —Riser Flotation Computations
64
#8 — Storm Drainage Area Map . .
..............................................................................................................
66
#9 — Flow Tabulation Form and Inlet Capacity ................................ ...
.......................................................
67
#10 — Hydraulic Grade Line Computations................................................................................................68
'
#I I — Riprap Channel Design.....................................................................................................................69
TRIGON ENGINEERING CONSUL TMT S, INC. Page 1

Concrete Supply Company - North Charlotte Plant March 16, 2007
Charlotte, North Carolina Trigon Project No. 018-06-016
INTRODUCTION
Concrete Supply Company's North Charlotte Property is a 9.89 acre parcel consisting of an existing
concrete batch plant and the main offices of Concrete Supply Company. The site is located northeast of
the intersection of Raleigh Street and East Craighead Road. The site is bound , on the west by East
Craighead Road, on the south by Raleigh Street, on the north by Little Sugar reek, and on the east by
Metromont Prestress Company. The site is in the Upper Little Sugar Creek Watershed. A Location Map is
included as Exhibit #1. b
The project consists of constructing rm water management to meet the requirements of NCDENR to
provided treatment for � process water from the site. NC-DEN"R has required
oncrete Sup.pljr_Companoiavideivater �ualit}treatmentfor�its-for-Cs well as
provide a plan to
to provide treatment of'their process -water to meet their NPDES permit requirements for
process water discharges. NPDES permit is attached as Exhibit 42.
The site has been separated into two drainage basins. The first basin (Drainage Basin 91- see SWM
Drainage Area Map) will drain to the proposed wet detention pond which will manage storm water runoff 2
in accordance with the NCDENR Best Management Practices for storm_ cater runoff, except that water [-
quality management is provide for the 10 year storm. Basin #1 has no process water draining to it. The
second basin (Drainage Basin #2- see SWM Drainage Area Map) contains the area with process water
' runoff, including truck washing, drum cleaning, irrigation of Qggregate piles, unloading area for aggregate
and cement, and concrete batch processing. This area will be managed with the construction of a
treatment basin designed for the entire basin draining to the treatment basin. This basin is designed to
��J
contain the 10year storm. �permif'
STORM WATER MANAGEMENT
Storm water quality controls are required for this site by NCDENR requirements for concrete batch
plants. Water quality management is provided by use of a wet detention pond for Basin 41 and a storm
water treatment basin for Basin #2.
Built upon area (BUA) will decrease as a result of construction of this project. Existing BUA is 6.2 acres, ?
and proposed BUA is 5.9 acres. .
IWater Quality Design Methodology
Ca/cs s6ia�J25,`
NCDENR has req�walerality management for the 10 year storm for the entire Drainage Area for
this site.__
ite. - _ -- - ----- - - "-- ---
Water quality management is provided for this site by a wet detention pond and a stogy at r treatment
basin. The surface area, temporary water quality storage, sediment storage, and forebay volume are based
on the requirements in the NCDENR BMP Manual. The elevations and storagejre wire eats for pond are
G included in Exhibit 44. The'sto ater reatment basin is sized to have the 10 year storm volume plus
other water sources, and minus water usage at the plant. See water balance for Drainage Basin #2
included in Exhibit #4 for sizing of th to -wale treatment basin.
'55 rz,V�Src,, S
rt oif- C$ kryt
TwwmENGINF,F,RINGCONSULTANTs, INC.
Page 2

Concrete Supply Company — N rth Charlotte Plant March 16, 2007
tCharlotte, A'orlh Carolina Trigon Project No. 018-06-016
ter Quantity Design Methodology
7
Water quantity management is not required forthissite. The pond is however designed to safely pass the
100 year storm with a minimum of 1-foot of freeboard in the pond. The wet detention does provide a
' significant peak flow attenuation of the existing runoff from the site as a result of the pond design.
Hydrologic c\ putations were performed using NRCS Technical Release No. 55 (TR55) (2). Time of
' concentration, a4runoff curve numbers (RCN) were developed by the methodology in TR55. Soil type
information and hydrologic soil classifications were obtained from the Mecklenburg County Soil Survey
(3). Rainfall data wee,obained from U.S. Weather Bureau Technical Paper No. 40 (4).
' The rainfall distribution used to determine runoff was the 24 hour duration Type II storm, based on NRCS
requirements. For this area of the U.S., NRCS has determined that a 24 hour duration storm is critical for
areas up to 2000 acres. The Type 1I distribution is based on generalized rainfall depth -duration
' relationships obtained from U:S. Weather Bureau Technical Papers 149 and 40 (3). The Type 11
distribution is for regions of the US where the high rates of runoff from small areas are usually generated
from summer thunderstorms. Hydrographs were developed using a runoff volume based on a 6 hour
' balanced storm distribution and the H.R. Malcom spreadsheets and methodology (5).
Storm routing through the storm water anagement pond was performed using the H.R. Malcom
' spreadsheets that utilize the chainsaw routing method. The 100 year storm was handled by an overflow
weir with the primary pipe outfall designed to safely pass the 100 year storm, while maintaining a
minimum of 1-foot of freeboard in the pond.
Orifice flow was calculated using the orifice equation %(Q = area of the orifice * Ca* �2gh) with an orifice
coefficient (Cd) of 0.6. Flow calculations for the overflw weir were calculated using the broad crested
weir equation (Q = Cd * L * h 3/2) with a weir coefficient (Cd ) of 3.3, and a weir length based on the
outlet structure dimensions. Outlet barrel flow was calculated using the orifice equation with a pipe
entrance coefficient of 0.5.
Water Quantity Design Computations
Design computations are included as Exhibits 95 - #7.
The design flowrates are summarized as follows:
Design Storm
Existing
Propos
2 year
23 cfs
0.2 c
10 year
36 cfs
0.3 c
100 year
55 cfs
16 ci
Maintenance and operations data are included as a separate
Specifications, plan, and profiles are included in the constru
TRIGON ENGINEERING CONSULTANTS. Lvc.

1
Concrete Supply Company — North Charlotte Plant March 16, 1007
' Charlotte. North Carolina Trigon Project No. 018-06-016
' STORM DRAINAGE DESIGN
The storm drainage system for the site is designed with use of the rationale formula (Q = CiA, where C is
the coefficient of discharge based on percent impervious, i is the rainfall intensity in inches per hour for
' the design storm, and A is the drainage area in acres).
The C-fact\; time of concentration and rainfall intensity were determined using the City of Charlotte
Storm Drainage\ Manual. Based on those criteria, five minutes was used for time of concentration in small
impervious areas. C-factor of 0.9 used for drainage area as they are largely paved or rooftop.
Inlet Calculations andsHydraulic Grade line calculations are included for the project
The storm drainage desig\n.is included as Exhibit 8 — Drainage Area Map, Exhibit 9 — Flow Tabulation
Form and Inlet Capacity Calculations, and Exhibit 10 — Hydraulic Grade Line Calculations.
EROSION CONTROL DESIGN
The erosion control for the project is designed based on the current NCDENR 2006 Erosion and Sediment
Control Planning and Design Manual. Specifications, plans, and details are included in the construction
plans for the project.
SWIM BUFFER REQUIREMENTS
The project is located in the SWIM buffer for Little Sugar Creek. There is existing concrete pavement and
concrete structures in the SWIM buffer at the site.. The storm water pond and the storm water treatment
basin are both partially located in the SWIM buffer�This site meets the requirements for not conforming
to the SWIM buffer requirements per Section 12.803 of the SWIM Buffer Ordinance.
This project however reduces the impervious area in the SWIM buffer, and provides for improved water
quality leaving the site as a result of the proposed improvements,
The project proposes replacing a in -stream storm water system discharge with a new in -stream storm
water discharge. With the peak flow attenuation provided by the \\proposed wet detention pond, stream
channel erosion as a result of this property, should be mitigated.
FEMA FLOOD PLAIN REQUIREMENTS
This project is also located within the 100 year FEMA flood plain for Little Sugar Creek. During the 100
year storm, a portion of the existing site is inundated (see plans for approximate flood plain location).
After this project is completed, the proposed wet detention pond and the proposed storm water treatment
basin will be inundated by the 100 year flood. The elevation of the FEMA flood will not be impacted by
the project as we are actually excavating the flood plain to construct the proposed wet detention pond, and
the proposed storm water treatment basin will_be-Iarger_than what exists on the site today. The 100 year
flood elevation for the site ranges from
Flood plain impacts are mitigated by the project.
TRIGONENGINEERINGCONSUL TAN S, LVC. Page 4

Concrete Supply Company —North Charlotte Plant March 16. 2007
' Charlotte. North Carolina Trigon Project No. 018-06-016
REFERENCES
(1) Technical Release No. 55, USDA Natural Resource Conservation Service, December 1993.
(2) Mecklenburg County North Carolina Soil Survey, USDA Soil Conservation Service, June 1980.
' (4) Technical Papers No. 149 and 40, U.S. Weather Bureau, May 1961.
(5) Elements of Urban Stormwater Design, H. Rooney Malcom, North Carolina State University,
' 1995.
(6) NCDENR Erosion and Sediment Control Planning and Design Manual, NCDENR, June 2006.
TRIGON ENGINEEPING CONSULTANTS. 1,vc Page 5

V,
EXHIBIT # 1 -VICINITY MAP
CONCRETE SUPPLY NORTH CHARLOTTE
Engineering Consultants, Inc. CHARLOTTE, NORTH CAROLINA
313 Gallimore Dairy Road Date: 2007-02-22 Scale: 1" =1000'
Greensboro, North Carolina 27409
p 336.668.0093 Drawn By: AOS Project No: 01806016
336.668.3868

Concrete Supply Company — North Charlotte Plant February 26, 2007
Charlotte, North Carolina Trigon Project Ala. 018-06-016
Exhibit #2 — NPDES Permit
(NC General Permit #NCG 140000)
TRIGON ENGINEERING COASULTASTS, 1NC.
Page 7

STATE OF NORTH CAROLINA
DEPARTMENT OF ENVIRONMENT AND NATURAL RESOURCES
DIVISION OF WATER QUALITY
GENERAL PERMIT NO. NCC140000
TO DISCHARGE STORMWATER 1 PROCESS WASTEWATER UNDER TI-IE
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, this permit
is hereby issued to all owners or operators, hereafter permittees, which are covered by this permit
as evidenced by receipt of a Certificate of Coverage by the Environmental Management
Commission to allow the discharge of stormwater and process wastewater to the surface waters
of North Carolina or separate storm sewer systems conveying stormwater to surface waters in
accordance with the terms and conditions set forth herein.
Coverage under this general permit is applicable to all owners or operators of stormwater point
' source discharges and process wastewater discharges associated with activities classified as
establishments primarily engaged in Ready Mixed Concrete IStandard Industrial Classification
Code (SIC) 32731.
' Also included in this General Permit are stormwater discharges from those areas at the facilities
described above which are used for vehicle maintenance activities.
The following activities are specifically excluded from coverage under this General Permit:
Disposal of process wastewater not specifically designated in this permit into stormwater
Iconveyances, storm sewer outfails or into waters of the state:
* Disposal of return concrete and dumping excess concrete directly into stormwater
' conveyances, storm sewer outfails or into waters of the state.
The General Permit shall become effective on August 1, 2004.
The General Permit shall expire at midnight on July 31, 2009.
Signed this day July 13, 2004.
l% w
Alan W. Klimek, P.E., Director
Division of Water Quality
By the Authority of the Environmental Management Commission
Page 8

Permit No. NCG140000
TABLE OF CONTENTS
PART I
INTRODUCTION
Section A:
General Permit Coverage
Section B:
Permitted Activities
Section C:
Permit Renewal
PART II
MONITORING, CONTROLS, AND LIMITATIONS FOR PERMITTED
DISCHARGES
Section A:
Stormwater Pollution Prevention Plan
Section B:
Analytical Monitoring Requirements - Stormwater discharge
Section C:
Analytical Monitoring Requirements - Process wastewater discharge
Section D:
Qualitative Monitoring Requirements
PART III
STANDARD CONDITIONS
Section A:
Compliance and Liability
1. Compliance Schedule
2. Duty to Comply
3. Duty to Mitigate
4. Civil and Criminal Liability
5. Oil and Hazardous Substance Liability
6. Property Rights
7. Severability
8. Duty to Provide Information
9. Penalties for Tampering
10. Penalties for Falsification of Reports
Section B:
General Conditions
l . Continuation of the Expired General Permit
2. Transfers
3. When an Individual Permit May be Required
4. When an Individual Permit May be Requested
R
Page 9

Section C
Section D:
Section E:
Permit No. NCG140000
5. Signatory Requirements
6. General Permit Modification, Revocation and Reissuance, or Termination
7. Certificate of Coverage Actions
Operation and Maintenance of Pollution Controls
1. Proper Operation and Maintenance
2. Need to Halt or Reduce not a Defense
3. Bypassing of Stormwater Control Facilities
Monitoring and Records
1. Representative Sampling
2. Recording Results
3. Flow Measurements
4. Test Procedures
5. Representative Outfall
6. Records Retention
7. Inspection and Entry
Reporting Requirements
I. Discharge Monitoring Reports
2. Submitting Reports
3. Availability of Reports
4. Non-Stormwater Discharges
5. Planned Changes
6, Anticipated Noncompliance
7. Bypass
8. Twenty-four Hour Reporting
9. Other Noncompliance
10. Other Information
PART IV LIMITATIONS REOPENER
PART V ADMINISTERING AND COMPLIANCE MONITORING FEE REQUIREMENTS
PART VI DEFINITIONS
tv
Page 10

Permit No. NCG 140000
PART I INTRODUCTION
SECTION A: GENERAL PERMIT COVERAGE
All persons desiring to be covered by this General Permit must register with the Division of
Water Quality by the filing of a Notice of Intent (NOD and applicable fees. The NOI shall be
submitted and a certificate of coverage issued prior to any discharge of stormwater associated
with industrial activity that has a point source discharge to the surface waters of the state.
Any owner or operator not wishing to be covered or limited by this General Permit may make
application for an individual NPDES permit in accordance with NPDES procedures in 15A
NCAC 2H .0100, stating the reasons supporting the request. Any application for an individual
permit should be made at least 180 days prior to commencement of discharge.
This General Permit does not cover activities or discharges covered by an individual NPDES
permit until the individual permit has expired or has been revoked. Any person conducting an
activity covered by an individual permit but which could be covered by this General Permit may
request that the individual permit be revoked and coverage under this General Permit be
provided.
Facilities submitting NOIs for coverage under this permit, prior to establishment or approval of a
Total Maximum Daily Load (TMDL) for a priority pollutant(s) for stormwater discharges (i.e.
wet weather flows), may be covered under this permit during its term. For such facilities
continued coverage under the reissuance of this permit is subject to the facility demonstrating
that it does not have a reasonable potential to violate applicable water quality standards for such
pollutants due to the stormwater discharge(s). For facilities that do have a reasonable potential
for violation of applicable water quality standards due to the stormwater discharge(s) the facility
shall apply for an individual permit 180 days prior to the expiration of this general permit. Once
the individual permit is issued and becomes effective the facility will no longer have coverage
under the general permit. A list of approved TMDLs for the state of North Carolina can be found
at http://h2o.enr.state.ne.us/tmdl/General TMDLs.htm
During the period beginning on the effective date of the permit and lasting until expiration, the
Permittee is authorized to discharge stormwater and/or process wastewater associated with
industrial activity as defined in this permit. Such discharges shall be controlled, limited and
monitored as specified in this permit. Although this permit requires submittal of analytical
monitoring results annually, discharges occurring throughout the year must meet the conditions
and limitations of this permit.
SECTION B: PERMITTED ACTIVITIES
Until this permit expires or is modified or revoked, the permittee is authorized to discharge
stormwater and process wastewater to the surface waters of North Carolina or separate storm
sewer system which has been adequately treated and managed in accordance with the terms and
conditions of this General Permit. All discharges shall be in accordance with the conditions of
this perm it.
Part I Page 1 of 2
Page 11

Permit No. NCG 140000
Any other point source discharge to surface waters of the state is prohibited unless it is an
allowable non-stormwater discharge or is covered by another permit, authorization or approval.
The discharges allowed by this General Permit shall not cause or contribute to violations of
Water Quality Standards.
This permit does not relieve the permittee from responsibility for compliance with any other
applicable federal, state, or local law, rule, standard, ordinance, order, judgment, or decree.
SECTION C: PERMIT RENEWAL
Dischargers covered by general permits need not submit new Notices of Intent or renewal
requests unless so directed by the Division. If the Division chooses not to renew a general
permit, all facilities covered under that general permit shall be notified to submit applications for
individual permits or notified to take other appropriate actions at the discretion of the Director.
Part I Page 2 of 2
Page 12

Permit No. NCG 140000
I
PART II MONITORING, CONTROLS, AND LIMITATIONS FOR
I
PERMITTED DISCHARGES
SECTION A: STORMWATER POLLUTION PREVENTION PLAN
The Permittee shall develop a Stormwater Pollution Prevention Plan, herein after referred to as
' the Plan. This Plan shall be considered public information in accordance with Part III, Standard
Conditions, Section E, Paragraph 3 of this general permit. The Plan shall include, at a minimum,
the following items:
Site Plan. The site plan shall provide a description of the physical facility. The site plan
shall contain the following:
(a) A general location map (USGS quadrangle map or appropriately drafted equivalent
map), showing the facility's location in relation to transportation routes and surface
waters, the name of the receiving water(s) to which the stormwater outfall(s)
discharges, or if the discharge is to a municipal separate storm sewer system, the name
of the municipality and the ultimate receiving waters; and accurate latitude and
longitude of the point(s) of discharge.
(b) A list of the potential pollutant sources which may be expected to contribute to
contamination of stormwater discharges
(c) A narrative description of storage practices, loading and unloading activities,
outdoor process areas, dust or particulate generating or control processes, and
waste disposal practices.
(d) A site map drawn to scale with the distance legend indicating location of
industrial activities (including storage of materials, disposal areas, process areas
and loading and unloading areas), drainage structures, drainage areas for each
outfall and activities occurring in the drainage area, building locations, existing
BMPs and impervious surfaces, and the percentage of each drainage area that is
impervious. For each outfall, a narrative description of the potential pollutants
which could be expected to be present in the stormwater discharge.
(e) A list of significant spills or leaks of pollutants (see definitions) that have
occurred at the facility during the 3 previous years and any corrective actions
taken to mitigate spill impacts.
(f) Certification that the stormwater outfalls have been evaluated for the presence of
non-stormwater discharges. The certification statement will be signed in
accordance with the requirements found in Part lll, Standard Conditions, Section
B, Paragraph 5.
1 2. Stormwater Management Plan. The stormwater management plan shall contain a
narrative description of the materials management practices employed which control or
1 minimize the exposure of significant materials to Stormwater, including structural and
Part ll Page 1 of l l
' Page 13

Permit No. NCG 140000
nonstructural measures. The stormwater management plan, at a minimum, shall
incorporate the following:
(a) Feasibility Study. A review of the technical and economic feasibility of changing
the methods of operations and/or storage practices to eliminate or reduce exposure
of materials and processes to stormwater. Wherever practical, the permittee shall
prevent exposure of all storage areas, material handling operations, and
manufacturing or fueling operations. In areas where elimination of exposure is
not practical, the stormwater management plan shall document the feasibility of
diverting the stormwater runoff away from areas of potential contamination.
(b) Secondary Containment Schedule. A schedule to provide secondary containment
for bulk storage of liquid materials, storage of Section 313 of Title III of the
Superfund Amendments and Reauthorization Act (SARA) water priority
chemicals, or storage of hazardous substances to prevent leaks and spills from
contaminating stormwater runoff. If the secondary containment devices have a
drain, the drain shall be controlled by manually activated valves or other similar
devices, which shall be secured with a locking mechanism. If there is no drain, the
containment shall be observed and pumped out as needed to maintain adequate
capacity. Any stormwater that accumulates in the containment area shall be at a
minimum visually observed for color, foam, outfall staining, and visible sheens,
prior to release of the accumulated stormwater. Accumulated stormwater shall be
released if found to be uncontaminated by the material stored within the
containment area. Records documenting the individual making the observation,
the description of the accumulated stormwater and the date and time of the release
shall be kept for a period of five years.
(c) BMP Summary. A narrative description shall be provided of Best Management
Practices (BMPs) to be considered such as, but not limited to, oil and grease
separation, debris control, vegetative filter strips, infiltration and stormwater
detention or retention, where necessary. The need for structural BMPs shall be
based on the assessment of potential of sources to contribute significant quantities
of pollutants to stormwater discharges and data collected through monitoring of
stormwater discharges.
Spill Prevention and Response Plan. The Spill Prevention and Response Plan (SPRP)
shall incorporate an assessment of potential pollutant sources based on a materials
inventory of the facility. Facility personnel (or team) responsible for implementing the
SPRP shall be identified. A responsible person shall be on -site at all times during facility
operations that have the potential to contaminate stormwater runoff through spills or
exposure of materials associated with the facility operations. The SPRP must be site
stormwater specific. Therefore, a SPCC plan may be a component of the SPRP, but may
not be sufficient to completely address the stormwater aspects of the SPRP. The common
elements of the SPCC with the SPRP may be incorporated by reference into the SPRP.
4. Preventative Maintenance and Good Housekeeping Program. A preventative
maintenance program shall be developed. The program shall document schedules of
inspections and maintenance activities of stormwater control systems, plant equipment
Part II Page 2 of 11
Page 14

Permit No. NCG 140000
and systems. Inspection of material handling areas and regular cleaning schedules of
' these areas shall be incorporated into the program.
5. Employee Training. Training schedules shall be developed and training provided for all
' employees at a minimum on an annual basis on proper spill response and cleanup
procedures and preventative maintenance activities for all personnel involved in any of
the facility's operations. Facility personnel (or team) responsible for implementing the
training shall be identified.
6. Responsible Party. The Stormwater Pollution Prevention Plan shall identify a specific
position(s) responsible for the overall coordination, development, implementation, and
revision to the Plan. Responsibilities for all components of the Plan shall be documented
and position assignments provided.
Plan Amendment. The permittee shall amend the Plan whenever there is a change in
design, construction, operation, or maintenance, which has a significant effect on the
potential for the discharge of pollutants to surface waters. The Stormwater Pollution
Prevention Plan shall be reviewed and updated on an annual basis. Revision dates should
be included on the pages changed.
The Director, or his designee, may notify the permittee when the Plan does not meet one
or more of the minimum requirements of the permit. Within 30 days of such notice, the
permittee shall submit a time schedule to the Director, or his designee, for modifying the
Plan to meet minimum requirements. The permittee shall provide certification in writing
(in accordance with Part 111, Standard Conditions, Section B, Paragraph 5) to the Director,
or his designee, that the changes have been made.
Facility Inspection Program. Facilities are required to inspect all BMP's and stormwater
systems on at least a semiannual schedule, once in the fall (September -November) and
once during the spring (April - June). The inspection and any subsequent maintenance
activities performed shall be documented, recording date and time of inspection,
individual(s) making the inspection, and any comments. Records of these inspections
shall be incorporated into the Stormwater Pollution Prevention Plan.
Stormwater discharge characteristic monitoring as required in Part 11 of this permit shall
be performed in addition to facility inspections.
9. Implementation. The permittee shall document all monitoring, measurements,
inspections and maintenance activities and training provided to employees, including the
log of the sampling data and of activities taken to implement BMPs associated with the
industrial activities, including vehicle maintenance activities. Such documentation shall
be kept on -site for a period of five years and made available to the Director or his
authorized representative immediately upon request.
Part II Page 3 of 1 I
Page 15

Permit No. NCG 140000
SECTION B: ANALYTICAL MONITORING REQUIREMENTS - STORMWATER
DISCHARGE
1. Stormwater associated with industrial activity that is not combined with process
wastewater
During the period beginning on the effective date of the permit and lasting until
expiration, the Permittee is authorized to discharge stormwater associated with industrial
activity that is not combined with process wastewater subject to the provisions of this
permit. Analytical monitoring of stormwater discharges shall be performed as specified
' below in Table 1.
For each parameter, the arithmetic mean of all analytical sampling results collected
' during the term of the permit shall be calculated for each individual outfall. The
computed arithmetic mean is then compared to the cut-off concentrations listed below in
Table 2. If the arithmetic mean is less than the specified cut-off concentration for a given
parameter, then the facility is not required to continue annual analytical monitoring for
that parameter (at that outfall) during the remaining term of the permit unless a significant
change in facility operations or configuration occurs. If a cut-off concentration results in
' discontinued analytical monitoring at an individual discharge outfall, the permittee is
required to maintain facility operations that ensure the continuation of stormwater runoff
quality.
The nermittee must nerform analvtical samoline of stormwater discharges during the first
and last year of the permit coverage regardless of cut-off concentration conditions.
Analytical results from sampling during the final year of the permit coverage must be
' submitted with the permit renewal application. All analytical monitoring shall be
performed during a representative storm event.
Table 1. Analytical Monitoring Requirements
Discharge
Characteristics
Units
Measurement
Frequency'
Sample
Type 2
Sample
Location"
H
standard
annually
Grab
SDO
Total Suspended Solids
m /l
annually
Grab
SDO
Total Rainfall'
inches
annually-
-
Event Duration'
minutes
annually-
-
Total Flow`
MG
annually
Grab
SDO
Footnotes:
I Measurement Frequency: Once per year during a representative storm event. A year is defined as the
12 month period beginning on the month and day of issuance of the Certificate of Coverage. Sampling
for the next year shall be scheduled to take place at least four months from the previous years sampling
event.
Part 11 Page 4 of 11
Page 16

Permit No. NCG140000
2 If the stormwater runoff is controlled by a stormwater detention pond, a grab sample of the discharge
from the pond shall be collected within the first 30 minutes of discharge. If the detention pond
discharges only in response to a storm event exceeding a ten year design storm, then no analytical
monitoring is required and only qualitative monitoring shall be performed. In all cases, water leaving the
pond is to meet permit requirements.
3 Sample Location: Samples shall be collected at each stormwater discharge outfall (SDO) unless
representative outfall status has been granted.
4 For each sampled representative storm event the total precipitation, storm duration, and total flow must
be monitored. Total flow shall be either; (a) measured continuously, (b) calculated based on the amount
of area draining to the outfall, the amount of built -upon (impervious) area, and the total amount of
rainfall, or (c) estimated by the measurement of flow at 20 minute intervals during the rainfall event.
Table 2. Cut-off Concentrations for Analytical Monitoring Requirements
Discharge Characteristics
Cut-off Concentration
HI
within range 6.0 - 9.0
Total Suspended Solids
100 m /l
Footnotes:
I pH cannot be averaged due to the nature of the logarithmic pH scale. The most recent pH sample result
shall be used for cut-off concentration purposes.
Stormwater associated with industrial activity from on -site vehicle maintenance areas that
is not combined with process wastewater
Facilities which have any vehicle maintenance activity occurring on -site which uses more
than 55 gallons of new motor oil per month when averaged over the calendar year shall
perform analytical monitoring as specified below in Table 3. This monitoring shall be
performed at all outfalls which discharge stormwater runoff from the vehicle maintenance
areas.
For each parameter, the arithmetic mean of all analytical sampling results collected
' during the coverage of the permit shall be calculated for each individual outfall. The
computed arithmetic mean is then compared to the cut-off concentrations listed below in
Table 4. If the arithmetic mean is less than the specified cut-off concentration for a given
' parameter, then the facility is not required to continue annual analytical monitoring for
that parameter (at that outfall) during the remaining coverage of the permit unless a
significant change in facility operations or configuration occurs. If a cut-off
' concentration results in discontinued analytical monitoring at an individual discharge
outfall, the permittee is required to maintain facility operations that ensure the
continuation of stormwater runoff quality.
The permittee must perform analytical sampling during the first and last year of the
permit coverage regardless of cut-off concentration conditions. Analytical results from
sampling during the final year of the permit coverage must be submitted with the permit
Part II Page 5 of 11
tPage 17

Permit No. NCG 140000
renewal application. All analytical monitoring shall be performed during a representative
storm event.
Table 3. Analytical Monitoring Requirements for On -Site Vehicle Maintenance
Discharge
Characteristics
Units
Measurement
Frequency'
Sample
Type 2
Sample
Location'
H
standard
annually
Grab
SDO
Total Suspended Solids
mg/1
annually
Grab
SDO
Oil and Grease
m /I
annually
Grab
SDO
New Motor Oil Usagegallons/month
annually
Estimate
-
Total Rainfall4
inches
annually-
-
Event Duration`
minutes
annually-
-
Total Flow4
MG
annually
Grab
SDO
Footnotes:
1 Measurement Frequency: Once per year during a representative storm event. A year is defined as the
12 month period beginning on the month and day of issuance of the Certificate of Coverage. Sampling
for the next year shall be scheduled to take place at least four months from the previous years sampling
event.
2 If the stormwater runoff is controlled by a stormwater detention pond, a grab sample of the discharge
from the pond shall be collected within the first 30 minutes of discharge. If the detention pond
discharges only in response to a storm event exceeding a ten year design storm, then no analytical
monitoring is required and only qualitative monitoring shall be performed. In all cases, water leaving
the pond is to meet permit requirements.
3 Sample Location: Samples shall be collected at each stormwater discharge outfall (SDO) that
discharges stormwater runoff from area(s) where vehicle maintenance activities occur.
4 Total flow shall be; (a) measured continuously, (b) calculated based on the amount of area draining to
the outfall, the amount of built -upon (impervious) area, and the total amount of rainfall, or (c) estimated
by the measurement of flow at 20 minute intervals during the rainfall event. Total precipitation and
duration of the rainfall event measured shall result from the sampled representative storm event.
Table 4. Cut-off Concentrations for On -Site Vehicle Maintenance Activities
Nr �i'1:,. ..v 3 • x
;Discharge Cliaractertstics.` #�
iC` 1C;'.1h ».'Y.'. <... '� �' k 'i4 -. Y 1
iCut=off.Concentrat�on_,x„'°;, 1 1
... .
pH
within range 6.0 - 9.0
Oil and Grease
30 mg/l
Total Suspended Solids
100 mg/1
Footnotes:
1 pH cannot be averaged due to the nature of the logarithmic pH scale. The most recent pH sample result
shall be used for cut-off concentration purposes.
Part 11 Page 6 of 11
Page 18

1
Permit No. NCG 140000
SECTION C: ANALYTICAL MONITORING REQUIREMENTS - PROCESS
' WASTEWATER
This general permit authorizes the discharge of process wastewater associated with four distinct
activities: 1) Vehicle and equipment cleaning - external surfaces; 2) Overflow from recycle
systems that receive stormwater runoff; 3) Wetting of raw material stockpiles; 4) Mixing drum
cleaning. Discharge of process wastewater generated by any other activity is not authorized
' under this permit. In the event that authorized process wastewaters commingle prior to
discharge, sampling the combined discharge will meet the conditions of this permit for those
separate activities, with respect to the annual sample. In the case of commingled process
' wastewater, the most stringent of the applicable limits will apply.
Note: For facilities which route stormwater and all process wastewater to a recycle system,
' no analytical monitoring of process wastewater discharges is required if that recycle
system discharges only as a result of a 10 year - 24 hour precipitation event.
Process Wastewater Associated with Vehicle and E ui ment Cleanin
During the period beginning on the effective date of the permit and lasting until expiration, the
Permittee is authorized to discharge process wastewater associated with vehicle and equipment
cleaning subject to the provisions of this permit. For the purposes of this permit, vehicle and
equipment cleaning is limited to the rinsing of the external surfaces of vehicles and equipment.
If detergents are used, they must be biodegradable and the pH adjusted to 6 to 9 standard units.
With or without the use of detergents, wastewater released to the waters of the State must meet
the requirements of Table 5
Analytical monitoring of process wastewater associated with vehicle and equipment cleaning
discharges shall be performed as specified below in Table 5. Annual analytical monitoring shall
be performed during a process wastewater discharge event associated with vehicle and
equipment cleaning.
Table 5. Analytical Monitoring Requirements
Discharge
Measurement',
Daily
Sample
Sample
Characteristics
Units
Frequency'
Maximum '
Types
Location3
Limit
PH 4
standard
annually
-
Grab
E
Total Suspended Solids
mg/1
annually
30 mg/1
Grab
E
Settleable Solids
MIA
annually
5 ml/l
Grab
E
Event Durations
minutes
annually
-
-
-
Total Flows
gallons
annually
-
-
E
Part II Page 7 of 11
Page 19

Permit No. NCG140000
Footnotes:
I Measurement Frequency: Once per year during a discharge event. A year is defined as the 12 month
period beginning on the month and day of issuance of the Certificate of Coverage. Sampling for the next
year shall be scheduled to take place at least four months from the previous years sampling event.
2 If the discharge is controlled by a detention pond, a grab sample of the discharge from the pond shall be
collected within the first 30 minutes of discharge. In all cases, water leaving the pond is to meet permit
requirements.
3 Sample Location: Effluent (E) = vehicle and equipment cleaning wastewater discharge outfall.
4 The pH shall not be less than 6.0 standard units nor greater than 9.0 standard units.
5 For each sampled discharge event the total discharge duration and total flow must be monitored. Total
flow can be measured continuously or calculated.
Process_ Wastewater Associated with Recycle Systems
During the period beginning on the effective date of the permit and lasting until expiration, the
Permittee is authorized to discharge process wastewater associated with the overflow of recycle
systems subject to the provisions of this permit. Overflow discharge refers to a discharge
associated with precipitation events in excess of the design storm, which produces influent that
exceeds the design capacity of the system.
Note: By design, a recycle system is closed loop and should not discharge on a
routine or continuous basis. As such, the routine or continuous discharge of
process wastewater from recycle systems is not authorized under this permit.
Analytical monitoring of process wastewater associated with the overflow of recycle system
discharges shall be performed as specified below in Table 6. All analytical monitoring shall be
performed during a process wastewater discharge event associated with the overflow of
recycling system.
Table 6. Analytical Monitoring Requirements
Discharge
Measurement.,
Daily I
Sample
Sample
Characteristics
Units
Frequency'
Maximum
Type'
Location'
Limit
pH
standard
annually
-
Grab
E
Total Suspended Solids
mg/1
annually
30 m l
Grab
E
Settleable Solids
mlll
annually
5 mlll
Grab
E
Event Duration'
minutes
annuall
-
-
-
Total Flowsgallons
annually
-
-
E
Part II Page 8 of I I
Page 20

Permit No. NCG 140000
Footnotes:
I Measurement Frequency: Once per year during a recycle system overflow discharge event. If no
discharge event occurs during the monitoring year, the permitte shall generate a signed certification
stating that no discharge occurred and that no sample is required for that monitoring year. A year is
defined as the 12-month period beginning on the month and day of issuance of the Certificate of
Coverage. Sampling for the next year shall be scheduled to take place at least four months from the
previous years sampling event. If the recycle system only discharges in response to a 10 year - 24 hour
precipitation event, no monitoring is required.
2 Sample within the first 30 minutes of discharge.
3 Sample Location: Effluent (E) = recycle system discharge outfall.
4 The pH shall not be less than 6.0 standard units nor greater than 9.0 standard units.
5 For each sampled recycle system discharge event the total discharge duration and total flow must be
monitored. Total flow can be measured continuously or calculated.
' 3. Process Wastewater Associated with Raw Material Stockpiles
During the period beginning on the effective date of the permit and lasting until
expiration, the Permittee is authorized to discharge process wastewater associated with
wetting of raw materials stockpiles subject to the provisions of this permit.
Analytical monitoring of process wastewater associated with wetting of raw material
stockpile discharges shall be performed as specified below in Table 7. All analytical
monitoring shall be performed during a process wastewater discharge event associated
with wetting of raw material stockpiles.
Table 7. Analytical Monitoring Requirements
Discharge
Measurement
Daily
Sample
Sample
Characteristics
Units
Frequency'
Maximum .
Type
Location'
Limit
H3
standard
annually
-
Grab
E
Total Suspended Solids
mg/1
annual)
30 mg/1
Grab
E
Settleable Solids
ml/l
annual)
S mlh
Grab
E
Event Duration
minutes
annually-
-
-
Total FlowI
gallons
annually
-
-
E
Footnotes:
1 Measurement Frequency: Once per year during a discharge event. A year is defined as the 12 month
period beginning on the month and day of issuance of the Certificate of Coverage. Sampling for the next
year shall be scheduled to take place at least four months from the previous years sampling event.
2 Sample Location: Effluent (E) = raw material stockpile discharge outfall.
3 The pH shall not be less than 6.0 standard units nor greater than 9.0 standard units.
Part II Page 9 of I 1
Page 21

Permit No. NCG 140000
' 4 For each sampled discharge event the total discharge duration and total flow must be monitored. Total
flow can be measured continuously or calculated. For discharges in excess of 24 hours, report total
flow in 24-hour period and event duration in days.
' 4. Process Wastewater Associated with Mixing Drum cleanout
' During the period beginning on the effective date of the permit and lasting until
expiration, the Permittee is authorized to discharge process wastewater associated mixing
drum cleanout subject to the provisions of this permit.
' Analytical monitoring of process wastewater associated with mixing drum cleanout
discharges shalt be performed as specified below in Table 8. All analytical monitoring
' shall be performed during a process wastewater discharge event associated with mixing
drum cleanout.
Table 8. Analytical Monitoring Requirements
Discharge
Measurement„
Daily
Sample
Sample
Characteristics
Units
Frequency'
Maximum '
Type
Location'
Limit
PH
standard
annually
-
Grab
E
Total Suspended Solids
mg/1
annually
30 m I
Grab
E
Settleable Solids
ml/l
annually
5 ml/l
Grab
E
Event Duration
minutes
annually-
-
-
Total Flow°gallons
annually
-
-
E
Footnotes:
1 Measurement Frequency: Once per year during a discharge event. A year is defined as the 12 month
period beginning on the month and day of issuance of the Certificate of Coverage. Sampling for the next
year shall be scheduled to take place at least four months from the previous years sampling event.
2 Sample Location: Effluent (E) — Mixing drum cleanout area discharge outfall.
3 The pH shall not be less than 6.0 standard units nor greater than 9.0 standard units.
4 For each sampled discharge event the total discharge duration and total flow must be monitored. Total
flow can be measured continuously or calculated.
Part 11 Page 10 of 1 I
Page 22

Permit No. NCG140000
SECTION F: QUALITATIVE MONITORING REQUIREMENTS
Qualitative monitoring requires a visual inspection of each stormwater outfall and/or combined
stormwater / process wastewater outfall regardless of representative outfall status and shall be performed
as specified below in Table 9. Qualitative monitoring is for the purpose of evaluating the effectiveness
of the Stormwater Pollution Prevention Plan (SPPP) and assessing new sources of stormwater pollution.
No analytical tests are required. Qualitative monitoring of stormwater and combined stormwater /
process wastewater outfalls does not need to be performed during a representative storm event.
The first qualitative monitoring event during the coverage of the permit must coincide with the initial
analytical monitoringe(regardless of the season). All other qualitative monitoring will be
performed twice per year, once in the spring (April - June) and once in the fall (September - November).
1 Table 9. Qualitative Monitoring Requirements
Discharge Characteristics
Frequency
Monitoring
Location
Color
Semi -Annual
Discharge Outfall
Odor
Semi -Annual
Discharge Outfall
Clarity
Semi -Annual
Discharge Outfall
Floating Solids
Semi -Annual
Discharge Outfall
Suspended Solids
Semi -Annual
Discharge Outfall
Foam
Semi -Annual
Discharge Outfall
Oil Sheen
Semi -Annual
Discharge Outfall
Other obvious indicators
of stormwater pollution
Semi -Annual
Discharge Outfall
Footnotes:
1 Monitoring Location: Qualitative monitoring shall be performed at each
stormwater/process wastewater discharge outfall regardless of representative
outfall status.
Part II Page I l of I I
Page 23

Permit No. NCG140000
PART III STANDARD CONDITIONS FOR NPDES STORMWATER GENERAL
PERMITS
SECTION A: COMPLIANCE AND LIABILITY
Compliance Schedule
The permittee shall comply with Limitations and Controls specified for stormwater
discharges in accordance with the following schedule:
Existing facilities: The Stormwater Pollution Prevention Plan shall be developed and
implemented within 12 months of the effective date of the initial certificate of coverage
issued pursuant to this general permit and updated thereafter on an annual basis.
Secondary containment, as specified in Part 1I, Section A, Paragraph 2(b) of this permit,
shall be accomplished within 12 months of the effective date of the initial certificate of
coverage.
Proposed Facilities: The Stormwater Pollution Prevention Plan shall be developed and
implemented prior to the beginning of discharges from the operation of the industrial
activity and be updated thereafter on an annual basis. Secondary containment, as
specified in Part II, Section A, Paragraph 2(b) of this permit shall be accomplished prior
to the beginning of discharges from the operation of the industrial activity.
2. Duty to Comply.
The permittee must comply with all conditions of this permit. Any permit noncompliance
constitutes a violation of the Clean Water Act and is grounds for enforcement action; for permit
termination, revocation and reissuance, or modification; or denial of a permit renewal
application.
' (a) The permittee shall comply with effluent standards or prohibitions established under section
307(a) of the Clean Water Act for toxic pollutants and with standards for sewage sludge use or
disposal established under section 405(d) of the CWA within the time provided in the regulations
that establish these standards or prohibitions or standards for sewage sludge use or disposal, even
if the permit has not yet been modified to incorporate the requirement.
' (b) The Clean Water Act provides that any person who violates section 301, 302, 306, 307, 308,
318 or 405 of the Act, or any permit condition or limitation implementing any such sections in a
pen -nit issued under section 402, or any requirement imposed in a pretreatment program
approved under sections 402(a)(3) or 402(b)(8) of the Act, is subject to a civil penalty not to
' exceed $27,500 per day for each violation. The Clean Water Act provides that any person who
negligently violates sections 301, 302, 306, 307, 308, 318, or 405 of the Act, or any condition or
limitation implementing any of such sections in a permit issued under section 402 of the Act, or
any requirement imposed in a pretreatment program approved under section 402(a)(3) or
402(b)(8) of the Act, is subject to criminal penalties of $2,500 to $25,000 per day of violation, or
imprisonment of not more than I year, or both. In the case of a second or subsequent conviction
for a negligent violation, a person shall be subject to criminal penalties of not more than $50,000
Part Ill Page 1 of 19
' Page 24

Permit No. NCG 140000
per day of violation, or by imprisonment of not more than 2 years, or both. Any person who
knowingly violates such sections, or such conditions or limitations is subject to criminal
penalties of $5,000 to $50,000 per day of violation, or imprisonment for not more than 3 years,
or both. In the case of a second or subsequent conviction for a knowing violation, a person shall
be subject to criminal penalties of not more than $100,000 per day of violation, or imprisonment
of not more than 6 years, or both. Any person who knowingly violates section 301, 302, 303,
306, 307, 308, 318 or 405 of the Act, or any permit condition or limitation implementing any of
such sections in a permit issued under section 402 of the Act, and who knows at that time that he
thereby places another person in imminent danger of death or serious bodily injury, shall, upon
conviction, be subject to a fine of not more than $250,000 or imprisonment of not more than 15
years, or both. In the case of a second or subsequent conviction for a knowing endangerment
violation, a person shall be subject to a fine of not more than $500,000 or by imprisonment of not
more than 30 years, or both. An organization, as defined in section 309(c)(3)(B)(iii) of the CWA,
shall, upon conviction of violating the imminent danger provision, be subject to a fine of not
more than $1,000,000 and can be fined up to $2,000,000 for second or subsequent convictions.
(c) Under state law, a daily civil penalty of not more than twenty-five thousand dollars ($25,000)
' per violation may be assessed against any person who violates or fails to act in accordance with
the terms, conditions, or requirements of a permit. [Ref: NC General Statutes 143-215.6A].
' (d) Any person may be assessed an administrative penalty by the Administrator for violating
section 301, 302, 306, 307, 308, 318 or 405 of this Act, or any permit condition or limitation
implementing any of such sections in a permit issued under section 402 of this Act.
' Administrative penalties for Class I violations are not to exceed $11,000 per violation, with the
maximum amount of any Class 1 penalty assessed not to exceed $27,500. Penalties for Class II
violations are not to exceed $1 1,000 per day for each day during which the violation continues,
' with the maximum amount of any Class 11 penalty not to exceed $137,500.
' 3. Duty to Mitigate
The permittee shall take all reasonable steps to minimize or prevent any discharge in
' violation of this general permit which has a reasonable likelihood of adversely affecting
human health or the environment.
4. Civil and Criminal Liabilit
Except as provided in Section C of this permit regarding bypassing of stormwater control
facilities, nothing in this general permit shall be construed to relieve the permittee from
' any responsibilities, liabilities, or penalties for noncompliance pursuant to NCGS 143-
26.3, 143-215.6A, 143-215.613, 143-215.6C or Section 309 of the Federal Act, 33 USC
1319. Furthermore, the permittee is responsible for consequential damages, such as fish
' kills, even though the responsibility for effective compliance may be temporarily
suspended.
1 5. Oil and Hazardous Substance Liability
Nothing in this general permit shall be construed to preclude the institution of any legal
' action or relieve the permittee from any responsibilities, liabilities, or penalties to which
Part III Page 2 of 19
' Page 25

Permit No. NCG140000
the permittee is or may be subject to under NCGS 143-215.75 et seq. or Section 311 of the
Federal Act, 33 USC 1321.
6. Property Rights
The issuance of this general permit does not convey any property rights in either real or
personal property, or any exclusive privileges, nor does it authorize any injury to private
property or any invasion of personal rights, nor any infringement of Federal, State or
local laws or regulations.
7. Severability
The provisions of this general permit are severable, and if any provision of this general
permit, or the application of any provision of this general permit to any circumstances, is
held invalid, the application of such provision to other circumstances, and the remainder
of this general permit, shall not be affected thereby.
' 8. Duty to Provide Information
The permittee shall furnish to the Director, within a reasonable time, any information
' which the Director may request to determine whether cause exists for modifying,
revoking and reissuing, or terminating the certificate of coverage issued pursuant to this
general permit or to determine compliance with this general permit. The permittee shall
' also furnish to the Director upon request, copies of records required to be kept by this
general permit.
9. Penalties for Tampering
The Clean Water Act provides that any person who falsifies, tampers with, or knowingly
renders inaccurate, any monitoring device or method required to be maintained under this
general permit shall, upon conviction, be punished by a fine of not more than $10,000 per
violation, or by imprisonment for not more than two years per violation, or by both. If a
e conviction of a person is for a violation committed after a first conviction of such person
under this paragraph, punishment is a fine of not more that $20,000 per day of violation,
or by imprisonment of not more than 4 years, or both.
10. Penalties for Falsification of Reports
The Clean Water Act provides that any person who knowingly makes any false statement,
' representation, or certification in any record or other document submitted or required to
be maintained under this general permit, including monitoring reports or reports of
compliance or noncompliance shall, upon conviction, be punished by a fine of not more
than $10,000 per violation, or by imprisonment for not more than two years per violation,
or by both.
Part 111 Page 3 of 19
Page 26

Permit No. NCG140000
SECTION B: GENERAL CONDITIONS
' 1. General Permit Expiration
' The permittee is not authorized to discharge after the expiration date of this General
Permit. In order to receive automatic authorization to discharge beyond the expiration
date, the permittee shall submit forms and fees as are required by the agency authorized
' to issue permits no later than 180 days prior to the expiration date. Any permittee that
has not requested renewal at least 180 days prior to expiration, or any permittee that does
not have a permit after the expiration and has not requested renewal at least 180 days
prior to expiration, will be subjected to enforcement procedures as provided in NCGS
§143-2153.6 and 33 USC 1251 et. seq.
2. Transfers
The certificate of coverage issued pursuant to this general permit is not transferable to
any person except after notice to and approval by the Director. The Director may require
modification or revocation and reissuance of the certificate of coverage to change the
name and incorporate such other requirements as may be necessary under the Clean
Water Act. Permittee is required to notify the Division in the event the permitted facility
' is sold or closed.
3. When an Individual Permit May be Required
The Director may require any owner/operator authorized to discharge under a certificate
of coverage issued pursuant to this general permit to apply for and obtain an individual
e permit or coverage under an alternative general permit. Any interested person may
petition the Director to take action under this paragraph. Cases where an individual
permit may be required include, but are not limited to, the following:
' a. The discharger is a significant contributor of pollutants;
b. Conditions at the permitted site change, altering the constituents and/or
characteristics of the discharge such that the discharge no longer qualifies for a
general permit;
1 C. The discharge violates the terms or conditions of this general permit;
d. A change has occurred in the availability of demonstrated technology or practices
' for the control or abatement of pollutants applicable to the point source;
e. Effluent limitations are promulgated for the point sources covered by this general
permit;
f. A water quality management plan containing requirements applicable to such
' point sources is approved after the issuance of this general permit.
g. The Director determines at his own discretion that an individual permit is
required.
Part III Page 4 of 19
' Page 27

Permit No. NCG 140000
' 4. When an Individual Permit May be Requested
Any permittee operating under this general permit may request to be excluded from the
' coverage of this general permit by applying for an individual permit. When an individual
permit is issued to an owner/operator the applicability of this general permit is
automatically terminated on the effective date of the individual permit.
5. Signatory Requirements
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 Section, 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.
b. All reports required by the general permit and other information requested by the
Director shall be signed by a person described above or by a duly authorized
representative of that person. A person is a duly authorized representative only if:
(1) The authorization is made in writing by a person described above;
' (2) The authorization specified either an individual or a position having
responsibility for the overall operation of the regulated facility or activity,
such as the position of plant manager, operator of a well or well field,
superintendent, a position of equivalent responsibility, or an individual or
position having overall responsibility for environmental matters for the
company. (A duly authorized representative may thus be either a named
individual or any individual occupying a named position.); and
(3) The written authorization is submitted to the Director.
Part III Page 5 of 19
' Page 28

Permit No. NCG 140000
C. Any person signing a document under paragraphs a. or b. of this section shall
make the following certification:
"I certify, under penalty of law, that this document and all attachments were
' prepared under my direction or supervision in accordance with a system designed
to assure that qualified personnel properly gather and evaluate the information
submitted. Based on my inquiry of the person or persons who manage the system,
' or those persons directly responsible for gathering the information, the
information submitted is, to the best of my knowledge and belief, true, accurate,
and complete. I am aware that there are significant penalties for submitting false
information, including the possibility of fines and imprisonment for knowing
eviolations."
6. General Permit Modification. Revocation and Reissuance. or Termination
The issuance of this general permit does not prohibit the Director from reopening and
modifying the general permit, revoking and reissuing the general permit, or terminating
' the general permit as allowed by the laws, rules, and regulations contained in Title 40,
Code of Federal Regulations, Parts 122 and 123; Title 15A of the North Carolina
Administrative Code, Subchapter 2H .0100; and North Carolina General Statute 143-
' 215.1 et. al.
After public notice and opportunity for a hearing, the general permit may be terminated
' for cause. The filing of a request for a general permit modification, revocation and
reissuance, or termination does not stay any general permit condition. The certificate of
coverage shall expire when the general permit is terminated.
7. Certificate of Coverage Actions
The certificate of coverage issued in accordance with this general permit may be
modified, revoked and reissued, or terminated for cause. The notification of planned
changes or anticipated noncompliance does not stay any general permit condition.
SECTION C: OPERATION AND MAINTENANCE OF POLLUTION CONTROLS
' l . Proper Operation and Maintenance
The permittee shall at all times properly operate and maintain all facilities and systems of
treatment and control (and related appurtenances) which are installed or used by the
permittee to achieve compliance with the conditions of this general permit. Proper
operation and maintenance also includes adequate laboratory controls and appropriate
quality assurance procedures. This provision requires the operation of back-up or
auxiliary facilities or similar systems which are installed by a permittee only when the
operation is necessary to achieve compliance with the conditions of the general permit.
Part III Page 6 of 19
Page 29

4.
Permit No. NCG140000
Need to Halt or Reduce not a Defense
It shall not be a defense for a permittee in an enforcement action that it would have been
necessary to halt or reduce the permitted activity in order to maintain compliance with
the condition of this general permit.
Bypassing of Stormwater Control Facilities
Bypass is prohibited and the Director may take enforcement action against a permittee
for bypass unless:
a. Bypass was unavoidable to prevent loss of life, personal injury or severe property
damage; and
b. There were no feasible alternatives to the bypass, such as the use of auxiliary
control facilities, retention of stormwater or maintenance during normal periods of
equipment downtime or dry weather. This condition is not satisfied if adequate
backup controls should have been installed in the exercise of reasonable
engineering judgment to prevent a bypass which occurred during normal periods
of equipment downtime or preventive maintenance; and
The permittee submitted notices as required under Section E of this permit.
If the Director determines that it will meet the three conditions listed above, the Director
may approve an anticipated bypass after considering its adverse effects.
Bypassing of Wastewater Treatment Facilities
The permittees may allow any bypass to occur which does not cause effluent limitations
to be exceeded, but only if it also is for essential maintenance to assure efficient
operation. These bypasses are not subject to the provisions of Part III, Section C.4.a and
Part III, Section CA.b.
a. Notices
(1) Anticipated bypass. If the permittees knows in advance of the need for a
bypass, it shall submit prior notice, if possible at least ten days before the
date of the bypass, including an evaluation of the anticipated quality and
affect of the bypass.
(2) Unanticipated bypass. The permittees shall submit notice within 24 hours
of becoming aware of an unanticipated bypass as required in Part III,
Section E.7. of this permit.
b. Prohibition of Bypass
(1) Bypass is prohibited and the Director may take enforcement action against
the permittees for bypass, unless:
Part III Page 7 of 19
Page 30

Permit No. NCG 140000
(a) Bypass was unavoidable to prevent loss of life, personal injury or
' severe property damage; and
(b) There were no feasible alternatives to the bypass, such as the use of
' auxiliary control facilities, retention of untreated waste or
maintenance during normal periods of equipment downtime. This
condition is not satisfied if adequate backup should have been
' installed in the exercise of reasonable engineering judgment to
prevent a bypass which occurred during normal periods of
equipment downtime or preventive maintenance; and
' (c) The permittees submitted notices as required under Part III, Section
C.4.a of this permit.
' (2) The Director may approve an anticipated bypass, after considering its
adverse affects, if the Director determines that it will meet the three
conditions listed in Part III, Section CA.b.(I) of this permit.
SECTION D: MONITORING AND RECORDS
Renresentative Samnlin
Samples collected and measurements taken, as required herein, shall be characteristic of
the volume and nature of the permitted discharge. Analytical sampling shall be
' performed during a representative storm event. Samples shall be taken on a day and time
that is characteristic of the discharge. All samples shall be taken before the discharge
joins or is diluted by any other waste stream, body of water, or substance. Monitoring
' points as specified in this permit shall not be changed without notification to and
approval of the Director.
' 2. Recording Results
For each measurement, sample, inspection or maintenance activity performed or collected
' pursuant to the requirements of this general permit, the permittee shall record the
following information:
' a. The date, exact place, and time of sampling, measurements, inspection or
maintenance activity;
b. The individual(s) who performed the sampling, measurements, inspection or
' maintenance activity;
C. The date(s) analyses were performed;
' d. The individual(s) who performed the analyses;
e. The analytical techniques or methods used; and
Part III Page 8 of 19
' Page 31

Permit No. NCG 140000
The results of such analyses.
Flow Measurements
Where required, appropriate flow measurement devices and methods consistent with .
accepted scientific practices shall be selected and used to ensure the accuracy and
reliability of measurements of the volume of monitored discharges.
4. Test Procedures
Test procedures for the analysis of pollutants shall conform to the EMC regulations
published pursuant to NCGS 143-215.63 et. seq, the Water and Air Quality Reporting
Acts, and to regulations published pursuant to Section 304(g), 33 USC 1314, of the
Federal Water Pollution Control Act, as Amended, and Regulation 40 CFR 136.
To meet the intent of the monitoring required by this general permit, all test procedures
' must produce minimum detection and reporting levels and all data generated must be
reported down to the minimum detection or lower reporting level of the procedure.
5. Representative Outfall
If a facility has multiple discharge locations with substantially identical stormwater
discharges that are required to be sampled, the permittee may petition the Director for
representative outfall status. If it is established that the stormwater discharges are
substantially identical and the permittee is granted representative outfall status, then
sampling requirements may be performed at a reduced number of outfalls.
6. Records Retention
Visual monitoring shall be documented and records maintained at the facility along with
the Stormwater Pollution Prevention Plan. Copies of analytical monitoring results shall
also be maintained on -site (preferably in the SPPP file). The permittee shall retain
records of all monitoring information, including all calibration and maintenance records
and all original strip chart recordings for continuous monitoring instrumentation, and
copies of all reports required by this general permit for a period of at least 5 years from
the date of the sample, measurement, report or application. This period may be extended
by request of the Director at any time.
7. Inspection and Enta
The permittee shall allow the Director, or an authorized representative (including an
authorized contractor acting as a representative of the Director), or in the case of a facility
which discharges through a municipal separate storm sewer system, an authorized
representative of a municipal operator or the separate storm sewer system receiving the
discharge, upon the presentation of credentials and other documents as may be required
by law, to;
Part III Page 9 of 19
Page 32

Permit No. NCGI40000
a. Enter upon the permittee's premises where a regulated facility or activity is
located or conducted, or where records must be kept under the conditions of this
general permit;
b. Have access to and copy, at reasonable times, any records that must be kept under
the conditions of this general permit;
C. Inspect at reasonable times any facilities, equipment (including monitoring and
control equipment), practices, or operations regulated or required under this
general permit; and
d. Sample or monitor at reasonable times, for the purposes of assuring general
permit compliance or as otherwise authorized by the Clean Water Act, any
substances or parameters at any location.
SECTION E: REPORTING REQUIREMENTS
Discharge Monitoring Reports
Samples analyzed in accordance with the terms of this permit shall be submitted to the
Division on Discharge Monitoring Report forms provided by the Director. Submittals
shall be received by the Division no later than 30 days from the date the facility receives
the sampling results from the laboratory.
Documentation of the qualitative monitoring associated with the initial analytical
monitoring event shall be included with the required analytical monitoring submittal for
the first year of the permit coverage.
Analytical results from sampling during the final year of the permit coverage shall be
submitted with the permit renewal application.
2. Submitting Reports
Duplicate signed copies of all reports required herein, shall be submitted to the following
address:
' Central Files
Division of Water Quality
1617 Mail Service Center
Raleigh, North Carolina 27699-1617
3. Availability of Reports
Except for data determined to be confidential under NCGS 143-215.3(a)(2) or Section
308 of the Federal Act, 33 USC 1318, all reports prepared in accordance with the terms
' shall be available for public inspection at the offices of the Division of Water Quality As
Part III Page 10 of 19
' Page 33

Permit No. NCG 140000
required by the Act, analytical data shall not be considered confidential. Knowingly
' making any false statement on any such report may result in the imposition of criminal
penalties as provided for in NCGS 143-215.613 or in Section 309 of the Federal Act.
1 4. Non-Stormwater Discharges
If the storm event monitored in accordance with this general permit coincides with a non-
' stormwater discharge, the permittee shall separately monitor all parameters as required
under the non-stormwater discharge permit and provide this information with the
stormwater discharge monitoring report.
5. Planned Changes
The permittee shall give notice to the Director as soon as possible of any planned changes
at the permitted facility which could significantly alter the nature or quantity of pollutants
discharged. This notification requirement includes pollutants which are not specifically
listed in the general permit or subject to notification requirements under 40 CFR Part
' 122.42 (a).
6. Anticipated Noncompliance
' The permittee shall give notice to the Director as soon as possible of any planned changes
at the permitted facility which may result in noncompliance with the general permit
' requirements.
7. Noncompliance Notification
' The permittees shall report by telephone to either the central office or the appropriate
regional office of the Division as soon as possible, but in no case more than 24 hours or
on the next working day following the occurrence or first knowledge of the occurrence of
any of the following:
' a. Any occurrence at the wastewater treatment facility which results in the discharge
of significant amounts of wastes which are abnormal in quantity or characteristic,
or any other unusual circumstances.
' b. Any process unit failure, due to known or unknown reasons, that render the
facility incapable of adequate wastewater treatment such as mechanical or
electrical failures of pumps, aerators, compressors, etc.
eC. Any failure of a treatment facility resulting in a by-pass directly to receiving
waters without treatment of all or any portion of the influent to such facility.
' Persons reporting such occurrences by telephone shall also file a written report in
letter form within 5 days following first knowledge of the occurrence.
' Part 111 Page I I of 1
g 9
Page 34

E
Permit No. NCG140000
Bypass
a. Anticipated bypass. If the permittee knows in advance of the need for a bypass, it
shall submit prior notice, if possible at least ten days before the date of the bypass;
including an evaluation of the anticipated quality and affect of the bypass.
b. Unanticipated bypass. The permittee shall submit notice within 24 hours of becoming
aware of an unanticipated bypass.
Twenty-four Hour Reporting
The permittee shall report to the central office or the appropriate regional office any
noncompliance which may endanger health or the environment. Any information shall be
provided orally within 24 hours from the time the permittee became aware of the
circumstances. A written submission shall also be provided within 5 days of the time the
permittee becomes aware of the circumstances.
The written submission shall contain a description of the noncompliance, and its causes;
the period of noncompliance, including exact dates and times, and if the noncompliance
has not been corrected, the anticipated time compliance is expected to continue; and steps
taken or planned to reduce, eliminate, and prevent reoccurrence of the noncompliance,
The Director may waive the written report on a case -by -case basis if the oral report has
been received within 24 hours.
Other Noncompliance
The permittee shall report all instances of noncompliance not reported under 24 hour
reporting at the time monitoring reports are submitted.
Other Information
Where the permittee becomes aware that it failed to submit any relevant facts in a Notice
of Intent to be covered under this general permit or in any report to the Director, it shall
promptly submit such facts or information.
Part Ill Page 12 of 19
Page 35

Permit No. NCG 140000
PART IV LIMITATIONS REOPENER
This general permit shall be modified or alternatively, revoked and reissued, to comply
1 with any applicable effluent guideline or water quality standard issued or approved under
Sections 302(b) (2) (c), and (d), 304(b) (2) and 307(a) of the Clean Water Act, if the
effluent guideline or water quality standard so issued or approved:
' a. Contains different conditions or is otherwise more stringent than any effluent
limitation in the general permit; or
b. Controls any pollutant not limited in the general permit.
The general permit as modified or reissued under this paragraph shall also contain any
other requirements in the Act then applicable.
PART V ADMINISTERING AND COMPLIANCE MONITORING FEE
REQUIREMENTS
The permittee must pay the administering and compliance monitoring fee within 30
(thirty) days after being billed by the Division. Failure to pay the fee in timely manner in
accordance with 15A NCAC 2H .0105(b)(4) may cause this Division to initiate action to
revoke the Certificate of Coverage.
PART VI DEFINITIONS
1. Act
See Clean Water Act.
2. Arithmetic Mean
The arithmetic mean of any set of values is the summation of the individual
values divided by the number of individual values.
3. Allowable Non-Stormwater Discharges
This permit regulates stormwater discharges. Nan-stormwater discharges which
shall be allowed in the stormwater conveyance system are:
Part III Page 13 of 19
Page 36

Permit No. NCG140000
(a) All other discharges that are authorized by a non-stormwater NPDES
' permit.
(b) Uncontaminated groundwater, foundation drains, air -conditioner
1 condensate without added chemicals, springs, discharges of
uncontaminated potable water, waterline and fire hydrant flushings, water
from footing drains, flows from riparian habitats and wetlands.
' (c) Discharges resulting from fire -fighting or fire -fighting training.
t4. Best Management Practices (BMPs)
Measures or practices used to reduce the amount of pollution entering surface
waters. BMPs may take the form of a process, activity, or physical structure.
' 5. ByWss
' A bypass is the known diversion of stormwater from any portion of a stormwater
control facility including the collection system, which is not a designed or
established operating mode for the facility.
1 6. Bulk Storage of Liquid Products
' Liquid raw materials, manufactured products, waste materials or by-products with
a single above ground storage container having a capacity of greater than 660
gallons or with multiple above ground storage containers located in close
' proximity to each other having a total combined storage capacity of greater than
1,320 gallons.
' 7. Certificate of Coverage
The Certificate of Coverage (COC) is the cover sheet which accompanies the
' general permit upon issuance and lists the facility name, location, receiving
stream, river basin, effective date of coverage under the permit and is signed by
the Director.
' 8. Clean Water Act
The Federal Water Pollution Control Act, also known as the Clean Water Act
(CWA), as amended, 33 USC 1251, et. seq.
9. Division or DWO
' The Division of Water Quality, Department of Environment and Natural
Resources.
1
Part III Page 14 of 19
Page 37

Permit No. NCG 140000
10. Director
The Director of the Division of Water Quality, the permit issuing authority.
' IL . EMC
The North Carolina Environmental Management Commission.
' 12. Grab Sample
' An individual samples collected instantaneously. Grab samples that will be
directly analyzed or qualitatively monitored must be taken within the first 30
minutes of discharge.
' 13. Hazardous Substance
Any substance designated under 40 CFR Part 116 pursuant to Section 311 of the
' Clean Water Act,
14. Landfill
' A disposal facility or part of a disposal facility where waste is placed in or on land
and which is not a land treatment facility, a surface impoundment, an injection
' well, a hazardous waste long-term storage facility or a surface storage facility.
15. Municipal Separate Storm Sewer System
' A stormwater collection system within an incorporated area of local self-
government such as a city or town.
' 16. Notice of Intent
The state application form which, when submitted to the Division, officially
indicates the facility's notice of intent to seek coverage under a general permit.
17. Overburden
Any material of any nature, consolidated or unconsolidated, that overlies a
mineral deposit, excluding topsoil or similar naturally -occurring surface materials
that are not disturbed by mining operations.
18. Permittee
' The owner or operator issued a certificate of coverage pursuant to this general
permit.
1
Part 111 Page 15 of 19
Page 38

19.
20
21.
22
Permit No. NCG 140000
Point Source Discharge of Stormwater
Any discernible, confined and discrete conveyance including, but not specifically
limited to, any pipe, ditch, channel, tunnel, conduit, well, or discrete fissure from
which stormwater is or may be discharged to waters of the state.
Process Wastewater
For the purposes of this permit, process wastewater is wastewater generated from
the following activities:
(a) Vehicle and equipment cleaning operations. For the purposes of this permit, vehicle
and equipment cleaning is limited to the rinsing of the external surfaces of vehicles
and equipment. If detergents are used, they must be biodegradable and the
wastewater pH adjusted to 6 to 9 standard units
(b) Recycle system operations overflow discharge. Overflow discharge refers to
a discharge associated with an excessive precipitation event, which produces
influent that exceeds the design capacity of the system. By design, a recycle
system is closed loop and should not discharge on a routine, or continuous
basis. As such, the routine or continuous discharge of process wastewater
from recycle systems is not authorized under this permit.
(c) Raw material stockpile wetting operations. This includes wetting for control
of temperature and moisture content. Washing of raw materials is not
authorized under this permit.
(d) Mixing drum -cleaning operations. This includes vehicle mixing drum and
facility mixing drum cleaning. It also includes flushing the bed of a dump
truck, if used to deliver concrete to a job site.
Representative Storm Event
A storm event that measures greater than 0.1 inches of rainfall and that is preceded by at
least 72 hours in which no storm event measuring greater than 0.1 inches has occurred. A
single storm event may contain up to 10 consecutive hours of no precipitation. For
example, if it rains for 2 hours without producing any collectable discharge, and then
stops, a sample may be collected if a rain producing a discharge begins again within the
next 10 hours.
Representative Outfail Status
When it is established that the discharge of stormwater runoff from a single
outfall is representative of the discharges at multiple outfalls, the DWQ may grant
representative outfall status. Representative outfall status allows the permittee to
perform analytical monitoring at a reduced number of outfalls.
Part III Page 16 of 19
Page 39

Permit No. NCG140000
23. Secondary Containment
Spill containment for the contents of the single largest tank within the
containment structure plus sufficient freeboard to allow for the 25-year, 24-hour
storm event. This structure must have an impervious bottom and walls sealed to
hold the chemicals stored within the structure. The walls will preferably be
poured concrete, rather than concrete block.
24. Section 313 Water Priority Chemical
A chemical or chemical category which:
a. Is listed in 40 CFR 372.65 pursuant to Section 313 of Title III of the
Superfund Amendments and Reauthorization Act (SARA) of 1986, also
titled the Emergency Planning and Community Right -to -Know Act of
1986;
Is present at or above threshold levels at a facility subject to SARA title
III, Section 313 reporting requirements; and
C. That meet at least one of the following criteria:
(1) Is listed in appendix D of 40 CFR part 122 on either Table II
' (organic priority pollutants), Table III (certain metals, cyanides,
and phenols) or Table IV (certain toxic pollutants and hazardous
substances);
' (2) Is listed as a hazardous substance pursuant to section 311(b)(2)(A)
of the CWA at 40 CFR 116.4; or
1 (3) Is a pollutant for which EPA has published acute or chronic water
quality criteria.
25. Severe Property Damage
Means substantial physical damage to property, damage to the control facilities
1 which causes them to become inoperable, or substantial and permanent loss of
natural resources which can reasonably be expected to occur in the absence of a
bypass. Severe property damage does not mean economic loss caused by delays
' in production.
26. Significant Materials
' Includes, but is not limited to: raw materials; fuels; materials such as solvents,
detergents, and plastic pellets; finished materials such as metallic products; raw
materials used in food processing or production; hazardous substances designated
under section 101(14) of CERCLA; any chemical the facility is required to report
pursuant to section 313 of Title III of SARA; fertilizers; pesticides; and waste
Part III Page 17 of 19
' Page 40

Permit No. NCG140000
products such as ashes, slag and sludge that have the potential to be released with
' stormwater discharges.
27. Significant Spills
' Includes, but is not limited to: releases of oil or hazardous substances in excess of
reportable quantities under section 311 of the Clean Water Act (Ref: 40 CFR
' 110.10 and CFR 117.21) or section 102 of CERCLA (Ref: 40 CFR 302.4).
28. Stormwater Runoff
1 The flow of water which results from precipitation and which occurs immediately
following rainfall or as a result of snowmelt.
29. Stormwater Associated with Industrial Activity
The discharge from any point source which is used for collecting and conveying
' stormwater and which is directly related to manufacturing, processing or raw
material storage areas at an industrial site. Facilities considered to be engaged in
"industrial activities" include those activities defined in 40 CFR 122.26(b)(I4).
' The term does not include discharges from facilities or activities excluded from
the NPDES program.
30. Stormwater Pollution Prevention Plan
A comprehensive site -specific plan which details measures and practices to reduce
' stormwater pollution and is based on an evaluation of the pollution potential of
the site.
31. Ten Year Design Storm
The maximum 24 hour precipitation event expected to be equaled or exceeded on
the average once in ten years. Storm information can be found in the State of
North Carolina Erosion and Sediment Control Planning and Design Manual.
32. Total Flow
The flow corresponding to the time period over which the entire storm event
occurs. Total flow shall be either; (a) measured continuously, (b) calculated based
' on the amount of area draining to the outfall, the amount of built -upon
(impervious) area, and the total amount of rainfall, or (c) estimated by the
measurement of flow at 20 minute intervals during the rainfall event.
33. Total Maximum Daily Load (TMDL)
' TMDLs are written plans for attaining and maintaining water quality standards, in
all seasons, for a specific waterbody and pollutant. (A list of approved TMDLs for
Part Ill Page 18 of 19
' Page 41

Permit No. NCG 140000
the state of North Carolina can be found at
' http://h2o.enr.state.ne.us/tmdl/General_TMDLs.htm)
34. Toxic Pollutant
' Any pollutant listed as toxic under Section 307(a)(1) of the Clean Water Act.
' 35. Upset
Means an exceptional incident in which there is unintentional and temporary
' noncompliance with technology based permit effluent limitations because of
factors beyond the reasonable control of the permittee. An upset does not include
noncompliance to the extent caused by operational error, improperly designed
treatment or control facilities, inadequate treatment or control facilities, lack of
preventive maintenance, or careless or improper operation.
36. Vehicle Maintenance Activit
' Vehicle rehabilitation, mechanical repairs, painting, fueling, lubrication, vehicle
cleaning operations, or airport deicing operations.
' 37. Vehicle and equipment cleaning
e For the purposes of this permit, this cleaning is limited to the rinsing of the
external surfaces of vehicles and equipment. If detergents are used, they must be
biodegradable and the pH adjusted to 6 to 9 standard units
' 38. Visible Sedimentation
' Solid particulate matter, both mineral and organic, that has been or is being
transported by water, air, gravity, or ice from its site of origin which can be seen
with the unaided eye.
' 39. 25^year• 24 hour storm event
' The maximum 24-hour precipitation event expected to be equaled or exceeded, on
the average, once in 25 years.
Part III Page 19 of 19
Page 42

Concrete Supply Company — North Charlotte Plant February 20, 2007
' Charlotte, North Carolina Trigon Project So. 018-06-016
Exhibit #4 - Water Quality Computations
TRIGON ENGINF.F.RING CONSULTANTS, INC.
Page 44

Date: Feb-07
Project : Concrete Supply Charlotte North Plant
Project No.: 01806016
Location: Charlotte NC
Designed by: PJ
WET DETENTION POND REQUIREMENTS
Design Information
Drainage Area (A)
5.20
Ac.
"C" Factor
0.90
(weighted)
Design Storm
25Iy
Time of Concentration (Tc)
5.0
min.
Intensity (1)
6.5
inlhr
Built Upon Area
4. 8
IAc.
% Built Upon Area
_ 90.
%
Permanent Pool Depth w
3ift,Avg.
Depth
0
Pond Requirements \
Pond Design
SAIDA Ratio 3.741%
SAIDA Ratio 5.88
%
Surface Area Required (SA) 8,472
s.f.
Surface Area (SA) 13,320
s.f.
Temp.WQ Storage 16,233
Icu.ft. N
Temp.WQ Storage <18,146
cu.ft7
Permanent Sediment Storage I 2,360
lcu.ft.
Permanent Sediment Storag 4;387-Icu.ft.
Sed Storage in Forbay 1,770
lcuft
Sed Storage in Forbay 21280
cu.ft.'
Sed Storage Out Forbay 590
cu.ft.
Sed orat5 ge Outside Forbay,, 2,107
cu.ft.
Depth of Perm. Sed. Storage I 31in
(min.)
Dep�Perm. Sed. Stora F 0.5
ft

Date: Mar-07
Project : Concrete Supply Charlotte North Plant
Project No.: 1806005
Location: Charlotte NC
Designed by: PJ
SCS RUNOFF CURVE NUMBER COMPUTATION SHEET
BASIN
LAND USE
SOIL NAME !
HYDROLOGIC GROUP
AREA
(ACRES)
AREA
%)
CURVE NO.
(CN)
PRODUCT
CN X AREA
PROPOSED
PERVIOUS AREAS
VARIOUS SOILS 1 B
0.5
10.00%
69
6.9
BUILDINGS, PARKING & SIDEWALKS
VARIOUS SOILS 1 B
4.3
90.00%
98
88.2
TOTALS
4.761
100.00%
95.1
NOTES: WEIGHTED CN= 95
Page 46

Date: Mar-07
Project : Concrete Supply Charlotte North Plant
Project No.: 1806005
Location: Charlotte NC
Designed by: PJ
STORM WATER TREATMENT DESIGN
Drainage Area = 4.8 acres see Drainage Area Map
Weighted RCN = 95
t,= 0.10 hrs. assumed minimum time of concentration TR55
la = 0.11 in. la = 0.2S
Rainfall Depth:(P):
�(10yr. R.I. = 4.9 in.
r
Runoff:
where S = (10001RCN) - 10
from NC Rainfall Maps 25 year -1 day storm
R.O. = (P - 0.2S)21(P + 0.8S)
where S = (10001RCN) - 10
V,= 74,688 cf V,= R.O.(in.) * D.A.(acres)1(43,560 sflacre * 12 in./ft.)
Unit Peak Discharge:
I,IP = 0.02
(25 yr. R.I.) = 1010 csmlin. from NCRS TR55 - Exhibit 5-II
Peak Flow:
Q25 = 32.5 cfs Q25 = P (in.) * Unit Peak Discharge (csmlin. R.O.) * D.A.(acres)1640 acreslsm
Overfflow Box Weir Design:
H,N = 0.60 ft Hw = headwater depth over weir
Cd = 3.0 broadcrested weir coefficient of discharge
L = 23.3 ft L= QI(Cd*H312)
Provide 24'-0
Storage Volume:
3-Compartment Box
Page 47

Date: Mar-07
Project : Concrete Supply Charlotte North Plant
Project No.: 1806005
Location: Charlotte NC
Designed by: PJ
STORM WATER TREATMENT DESIGN
Length = 60.0 ft
Width = 35.0 ft
Depth = 8.80 ft minus 1-foot of freeboard to weir elevation (694.5 - 1.0 = 693.5)
Volume =` 36,960 cf
Total volume =' 95,399 cf Volume required = 74,688 cf
volume not including 1400t of freeboard over weir
Design Elevations:
3-Compartment Box
Bottom El. = 685.75
Top of Sediment = 686.25 as
Top of Required Storage = 693,50 at
Weir El. = 694.50 1-f
Design H.W. El. = 695.10 wei
Top Tank El. = 695.50
Existing Clearwell
Bottom El. = 684.20
Top of Sediment = 684.70
Top of Required Storage = 693.50
Weir El. = 694.50
Design H.W. El, = 694.50
Top Tank El. = 695.50
Outlet Pipe Size:
ass
Qto = 32.5 cfs
Pipe Size = 30 in.
Pipe Invert Upstream = 686.50
Inlet Control
H,,,1D = 1.4
H,,, = 3.5
H,, Elevation = 690.00
Outlet Control
H = 1.7
H.G. Downstream = 692.20
H,„ Elevation = 693.90
7
6-inch permanent sediment layer
.25-foot depth
oot of freeboard
r el. + headwater depth over weir
assume 6-inch permanent sediment layer
at 8.8-foot depth
1-foot of freeboard
weir el. + headwater depth over weir
existing top elevation = 694.7 (raise top 0.8-feet)
from FHWA HDS5
H, /D' Pipe Size
Pipe Invert + H,,
from FHWA HDS5
10 year H.W in Pond
H.G. Downstream + H CONTROLLING ELEVATION
Page 48

Date: Mar-07
Project : Concrete Supply Charlotte North Plant
Project No.: 1806005
Location: Charlotte NC
Designed by: PJ
SITE WATER BALANCE
Water IN Water OUT
Source (gallons) (gallons) JTotal
Storm Water Runoff
74,688
74,688
Truck Washout
7,800
7,800
0
based on 26 trucks/day ' 300gallons/truck
Plant and Aggregate Sprinklers
750
1
750
Plant Mix Water
3,800
3,800
avera a lant mix re uired
I
Total Water Use 1 83,2381 11,6001 71,638 re uired dischar a after 10 year storm
Page 49

Concrete Supply Company — North Charlotte Plant February 20, 2007
' Charlotte, North Carolina Trigon Project No. 018.06-016
Exhibit #5 — Wet Detention Pond Proposed RCN Computations
TRIGGN ENGlNEENvG CONSULTANTS, INC.
Page 50

Date: Feb-07
Project: Concrete Supply Charlotte North Plant
Project No.: 01806016
Location: Charlotte NC
Designed by: PJ
SCS RUNOFF CURVE NUMBER COMPUTATION SHEET
BASIN
LAND USE
SOIL NAME /
HYDROLOGIC GROUP
AREA
{ACRES}
AREA
%
CURVE NO.
CN
PRODUCT
CN X AREA
#1
PERVIOUS AREAS
VARIOUS SOILS / B
0.5
10.00%
69
6.9
BUILDINGS, PARKING & SIDEWALKS
VARIOUS SOILS / B
4.7
90.00%
98
88.2
TOTALS
1 5.20
100. 0%1
95.1
NOTES: WEIGHTED
CN = 95
Page 51

Concrete Supply Company — North Charlotte Plant February 20, 2007
' Charlotte, North Carolina Trigon Project No. 018-06-016
Exhibit #6 — Wet Detention Pond Storm Water Quantity Computations
TRIGON FNGINF.F,RING CONSULTANTS, INC.
Page 52

Date. Feb.07
Project: Concrete Supply Charlotte North Plant
7AT! Project No.: 01806016
Location: Charlotte NC
Designed br: PJ
TIME OF CONCENTRATION ! TRAVEL TIME WORKSHEET
Description: #1 Sheet of
CHECK ONE: X PRESENT DEVELOPED
CHECK ONE: X Tc Tt
SEE SHEET FOR LOCATION OF FLOW SEGMENTS.
SHEET FLOW (APPICABLE TO Tc ONLY) I SEGMENT ID
1. SURFACE DESCRIPTION {TABLE 3-1) . ....................
2. MANNING'S ROUGHNESS COEFF., n (TABLE 3-1).............
3. FLOW LENGTH, L (TOTAL L a 30(Y) ......................... FT
4. TWO YEAR 24 HOUR RAINFALL, P2 IN
5. LAND SLOPE, 5........................................ FTlFT
6. Tt = 0,007 (n L)A0.81(P2AO.5 S^0.4) ........ COMPUTE TI .. HR
7. SURFACE DESCRIPTION (PAVED OR UNPAVED) ...... . ....
8. FLOW LENGTH,L ................. ........ . ........... FT
0. WATERCOURSE SLOPE, S ...... . .. ...... .......... .. FT1F7
10. AVERAGE VELOCITY, V (SEE BELOW). ............ ........ FPS
11. T1= L 1(3600 V) . • . • . ........... ........ COMPUTE TI . HR.
+ + + = 000
CHANNEL PLOW I SEGMENT ID
PIPE SIZE (IF APPLICABLE).... .... — .. ASSUMED.... EN.
12. CROSS SECTIONAL FLOW AREA, A ........................ FT^2.
13, WETTED PERIMETER, Pw................... ............. FT.
14. HYDRAULIC RADIUS,R=AIPw..............COMPUTE R.. FT.
15. CHANNEL SLOPE, S. . ............. — ...... ASSUMED .... FT1FT.
16. MANNING'S ROUGHNESS COEFF., n ...................... .
17. V = 1.49 R^0,667 SA0.5 7 n ................... ASSUMED V . , , FPS,
18. FLOW LENGTH, L ........... . ............. ....... ..... FT.
19. Tt = L! (360D V) .. . ............. ......... COMPUTE TI .. HR.
20, WATERSHED OF SUBAREA Tc or TI (add T in steps 6, 11, end 19) ...... .......... ... ... ....... .......... HOURS. = 0,10
' UNPAVED V = 16,13 X S10.5 PAVED: V = 20,22 X S10.5 MINUTES. = 6
use minlmum T�
Page 53

PEAK RUNOFF COMPUTATION SHEET
PRESENT DEVELOPMENT
Drainage Area = 5.2 acres
Weighted RCN = 95
t,= 0.10 hrs.
I, = 0.11 in.
Rainfall Depth (P):
(2yr, R.I.) = 3.37 in.
(10yr. R.I.) = 4.90 in.
(25yr. R.I.) = 5.82 in,
(100yr. R.I.) = 7.30 in.
Runoff:
(2 yr. R.I.) = 2.81 in. 53070 cf
(10 yr. R.I.) = 4.32 in. 81553 cf
(25yr. R.I.) = 5.23 in. 98774 cf
(100 yr. R.I.) = 6.70 in. 126550 cf
Unit Peak Discharge: I,IP
(2 yr. R.I.) = 1010 csmlin. 0.03
(10 yr. R.I.) = 1010 csmlin. 0.02
(25yr. R.I.) = 1010 csm/in. 0.02
(100 yr. R.I.) = 1010 csmlin. 0.01
Peak Flow:
Q2 = 23.1 cfs
Q10 = 35.5 cfs
025 = 42.9 cfs
0100 = 55.0 cfs
Time to Peak:
2 yr.:
Rainfall (6 hr storm) = 2.6 in.
Runoff= 2.02 in.
volume of runoff = 38155 cf
TP = 19.8 min.
10 yr.:
Rainfall (6 hr storm) = 3.7 in.
Runoff = 3.14 in.
volume of runoff = 59188 cf
TP= 20.0 min.
100 yr.: Rainfall (6 hr storm) = 5A in.
Runoff = 4.82 in.
volume of runoff = 90907 cf
Tp= 19.8 min.
Date: Feb-07
Project: Concrete Supply Charlotte North Plant
Project No.: 01806016
Location: Charlotte NC
Designed by: PJ
Page 54

_ Date: Feb-07
Project : Concrete Supply Charlotte North Plant
AT
Project No.: 01806016
Location: Charlotte NC
GOtVI Designed by: PJ
ELEVATION -STORAGE COMPUTATION SHEET
STORAGE CALCULATIONS Drawing Scale : t"= 40 ft
Elevation Area (sq in) Area (sf) Volume Stage - Z
AS I YS ft
686
5267
0
0.0
687
7812
6540
6540
1.0
688
10485
9149
15688
2.0
689
13320
11903
27591
3.0
689
13320
0.0
690
16320
14820
14820
1.0
690.2
16936
3326
18146
691
19402
17861
32681
2.0
692
22309
20856
53537
3.0
693
25826
24068
77604
4.0
694
28331
27079
104683
5.0
' b = 1.24767889
K, = 13762.7927
check S = 13763 of for Stage = 1.0 ft
' check S = 32681 of for Stage = 2.0 ft
check S = 54200 of for Stage = 3.0 ft
check S = 77604 of for Stage = 4.0 ft
check S = 102517 of for Stage = 5.0 ft
Page 55

2 YEAR STORM ROUTING
Hydrologic Data:
peak C� = 23.1 cfs
Tp(2 yr.)= 19.8 min.
K, = 13762.79
b = 1.2477
Time Increment z 1 min
Date: 37674
Project: Concrete Supply Charlotte North Plant
Project No.: 01006016
Location: Charlotte NC
Designed by: PJ
Pond Data:
Pond invert =
689.0
Riser Crest =
692.3
Orifice Invert =
690.0
Top of Dam =
694.0
Outlet Barrel invert =
688.0
Outlet Structure:
Riser Length= 20 ft.
Riser Weir Coeff. = 3.3
Orifice Diameter = 2.00 in.
Orifice Entrance Coeff. = 0.6
Outlet Barrel Coeff, = 0.5
Outlet Barrel Diameter =24 in.
TIME
INFLOW
STORAGE
STORAGE ELEVATION OUTFLOW
ORIFICE
RISER CULVERT
(min)
(cis)
(cf)
(cf)
(ft)
(cfs)
(cfs)
(cfs) (cfs)
0
0
0
0
689.0
0.00
0.00
0
1
0
0
0
689.0
0.00
0.00
0
2
1
9
9
689.0
0.00
0.00
0
3
1
34
43
689.0
0.00
0.00
0
4
2
77
120
689.0
0.00
0.00
0
5
3
134
254
689.0
0.00
0.00
0
6
5
206
460
689.1
0.00
0.00
0
7
6
290
750
689.1
0.00
0.00
0
8
8
384
1134
689.1
0.00
0.00
0
9
10
485
1619
689.2
0.00
0.00
0
10
12
592
2212
689.2
0.00
0.00
0
11
14
702
2913
689.3
0.00
0.00
0
12
15
811
3724
689.4
0.00
0.00
0
13
17
917
4640
689.4
0.00
0.00
0
14
18
1017
5658
689.5
0.00
0.00
0
15
20
1110
6767
689.6
0.00
0.00
0
16
21
1191
7959
689.6
0.00
0.00
0
17
22
1261
9219
689.7
0.00
0.00
D
18
23
1316
10535
689.8
0.00
0.00
0
19
23
1355
11891
689.9
0.00
0.00
0
20
23
1378
13269
690.0
0.00
0.00
0
21
23
1384
14653
690.1
0.01
0.01
13
22
22
1372
16025
690.1
0.05
0.05
13
23
22
1341
17366
690.2
0,07
0.07
14
24
21
1294
18660
690.3
0.09
0.09
14
25
19
1233
19893
690.3
0.11
0.11
15
26
18
1160
21053
690.4
0.12
0.12
15
27
17
1085
22139
690.5
0.13
0.13
15
28
16
1015
23154
690.5
0.14
0.114
16
29
15
950
24104
690.6
0.15
0.15
16
30
14
889
24993
690.6
0.15
0.15
16
31
13
831
25824
690.7
0.16
0.16
16
32
12
778
26602
690.7
0.16
0.16
16
33
12
727
27329
690.7
0.17
0.17
17
34
11
680
28010
690.8
0.17
0.17
17
35
10
636
28646
690.8
0.18
0.18
17
36
9
595
29241
690.8
0.18
0.18
17
37
9
556
29797
690.9
0.18
0.18
17
38
8
520
30317
690.9
0.19
0.19
17
39
8
486
30803
690.9
0.19
0.19
17
40
7
454
31258
690.9
0.19
0.19
18
41
7
425
31683
691.0
0.20
0.20
18
42
6
397
32079
691.0
0,20
0.20
18
43
6
371
32450
691.0
0.20
0.20
18
44
6
346
32797
691.0
0.20
0.20
18
Page 56

_ Date: 37674
Project : Concrete Supply Charlotte North Plant
AV
Project No.: 01806016
Location: Charlotte NC
J3VQQN. Designed by: PJ
2 YEAR STORM ROUTING
Hydrologic Data:
peak QZ = 23.1 cfs
Tp (2 yr.) = 19.8 min.
K, = 13762.79
b = 1.2477
Time Increment =1 min.
Pond Data:
Pond Invert = 689.0
Riser Crest = 692.3
Orifice Invert = 690.0
Top of Dam = 694.0
Outlet Barrel Invert = 688.0
Outlet Structure:
Riser Length= 20 ft.
Riser Weir Coeff. = 3.3
Orifice Diameter=2.00 in.
Orifice Entrance Coeff. = 0.6
Outlet Barrel Coeff. = 0.5
Outlet Barrel Diameter =24 in.
TIME
INFLOW
STORAGE
STORAGE ELEVATION OUTFLOW
ORIFICE
RISER CULVERT
(min)
(cfs)
(cf)
(cf)
(ft)
(cfs)
(cfs)
(cfs) (cfs)
'
45
5
324
33120
691.0
0.20
0.20
18
46
5
302
33422
691.0
0.21
0.21
18
47
5
282
33705
691.1
0.21
0.21
18
' 48
4
263
33968
691.1
0.21
0.21
18
49
4
246
34214
691.1
0.21
0.21
18
50
4
229
34443
691.1
0.21
0.21
18
51
4
214
34657
691.1
0.21
0.21
18
' 52
3
199
34856
691.1
0.21
0.21
18
53
3
186
35042
691,1
0.21
0.21
18
54
3
173
35216
691.1
0.21
0.21
18
55
3
161
35377
691.1
0.22
0.22
18
56
3
150
35527
691.1
0.22
0.22
18
57
2
140
35667
691.1
0.22
0.22
18
58
2
130
35797
691.2
0.22
0.22
18
59
2
121
35918
691.2
0.22
0.22
19
60
1
2
112
36031
691.2
0.22
0.22
19
61
2
104
36135
691.2
0.22
0.22
19
62
2
97
36232
691.2
0.22
0.22
19
63
2
90
36322
691.2
0.22
0.22
19
64
2
83
36406
691.2
0.22
0.22
19
65
1
77
36483
691.2
0.22
0.22
19
66
1
71
36555
691.2
0.22
0.22
19
67
1
66
36621
691.2
0.22
0.22
19
' 68
1
61
36682
691.2
0.22
0.22
19
69
1
56
36738
691.2
0.22
0.22
19
70
1
52
36790
691.2
0.22
0.22
19
71
1
48
36838
691.2
0.22
0.22
19
' 72
1
44
36881
691.2
0.22
0.22
19
73
1
40
36922
691.2
0.22
0.22
19
74
1
37
36958
691.2
0.22
0.22
19
75
1
34
36992
691.2
0.22
0.22
19
' 76
1
31
37023
691.2
0.22
0.22
19
77
1
28
37050
691.2
0.22
0.22
19
78
1
25
37076
691.2
0.22
0.22
19
79
1
23
37098
691.2
0.22
0.22
19
80
1
20
37119
691.2
0.22
0.22
19
81
0
18
37137
691.2
0.22
0.22
19
82
0
16
37153
691.2
0.22
0.22
19
83
0
14
37168
691.2
0.22
0.22
19
' 84
0
13
37180
691.2
0.22
0.22
19
85
0
11
37191
691.2
0.22
0.22
19
86
0
9
37201
691.2
0.22
0.22
19
87
0
8
37209
691.2
0.22
0.22
19
' 88
0
7
37215
691.2
0.22
0.22
19
89
0
5
37221
691.2
0.22
0.22
19
1 Page 57

Date: 37674
Project : Concrete Supply Charlotte North Plant
AV
Project No.: 01806016
Location: Charlotte NC
TJRH�Qi -N Designed by: PJ
2 YEAR STORM ROUTING
Hydrologic Data:
Pond Data:
Outlet Structure:
'
peak 0,2 = 23.1 cfs
Pond Invert =
689.0
Riser Length= 20 ft.
Tp(2 yr.)= 19.8 min.
Riser Crest =
692.3
Riser Weir Coeff. = 3.3
K, = 13762.79
Orifice Invert =
690.0
Orifice Diameter = 2.00 in.
'
b = 1.2477
Top of Dam =
694.0
Orifice Entrance Coeff. = 0.6
Outlet Barrel Coeff. = 0.5
Outlet Barrel Invert =
688.0
Outlet Barrel Diameter =24 in.
Time Increment =1 min
TIME
INFLOW
STORAGE
STORAGE ELEVATION OUTFLOW
ORIFICE
RISER CULVERT
(min)
(cfs)
(CO
(cf)
(ft)
(cfs)
(cfs)
(cfs) (cfs)
90
0
4
37225
691.2
0.22
0.22
19
91
0
3
37228
691.2
0.22
0.22
19
92
0
2
37230
691.2
0.22
0.22
19
93
0
1
37231
691.2
0.22
0.22
19
94
0
0
37231
691.2
0.22 PEAK
0.22
19
95
0
-1
37230
691.2
0.22
0.22
19
96
0
-2
37228
691.2
0.22
0.22
19
97
0
-2
37226
691.2
0.22
0.22
19
98
0
-3
37223
691.2
0.22
0.22
19
99
0
4
37219
691.2
0.22
0.22
19
Page 58

10 YEAR STORM ROUTING
Hydrologic Data:
peak Q10 = 35.5 cfs
Tp(10yr.)= 20.0 min.
Kg = 13762,79
b = 1.2477
Time Increment =1 min.
Pond Data:
Date: 37673
Project : Concrete Supply Charlotte North Plant _
Project No.: 01806016
Location: Charlotte NC
Designed by: PJ
Pond Invert = 689.0
Riser Crest = 692.3
Orifice Invert =
690.0
Top of Dam =
694,0
Outlet Barrel Invert =
688.0
Outlet Structure:
Riser Length= 20 ft.
Riser Weir Coeff. = 3.3
Orifice Diameter m 2.00 in.
Orifice Entrance Coeff. = 0.6
Outlet Barrel Coeff. = 0.5
Outlet Barrel Diameter =24 in,
TIME
INFLOW
STORAGE
STORAGE ELEVATION OUTFLOW
ORIFICE
RISER CULVERT
(min)
(cfs)
(cf)
(cf)
(4)
(cfs)
(cfs)
(cfs) (cfs)
0
0
0
0
689.0
0.00
0.00
0
1
0
0
0
689.0
0.00
0.00
0
2
1
13
13
689.0
0.00
0.00
0
3
2
52
65
689.0
0,00
0.00
0
4
3
116
181
689.0
0,00
0.00
0
5
5
203
384
689.1
0.00
0.00
0
6
7
311
695
689.1
0.00
0.00
0
7
10
438
1132
689.1
0.00
0.00
0
8
12
580
1712
689.2
0.00
0.00
0
9
15
734
2446
689.3
0.00
0.00
0
10
18
896
3342
689.3
0,00
0,00
0
11
20
1062
4404
689.4
0.00
0,00
0
12
23
1229
5633
689.5
0.00
0.00
0
13
26
1391
7024
689.6
0.00
0.00
0
14
28
1545
8569
689.7
0.00
0.00
0
15
30
1687
10256
689.8
0.00
0.00
0
16
32
1814
12070
689.9
0.00
0.00
0
17
34
1923
13993
690.0
0.00
0.00
13
18
35
2010
16003
690.1
0.04
0.04
13
19
35
2072
18075
690.2
0.08
0.08
14
20
35
2109
20184
690.4
0.11
0.11
15
21
35
2121
22304
690.5
0.13
0.13
15
22
35
2107
24411
690.6
0.15
0.15
16
23
34
2067
26478
690.7
0.16
0.16
16
24
32
2003
28481
690.8
0.18
0.18
17
25
30
1916
30397
690.9
0.19
0.19
17
26
28
1807
32204
691.0
0.20
0.20
18
27
27
1694
33898
691.1
0.21
0.21
18
28
25
1586
35484
691.1
0.22
0.22
18
29
23
1485
36969
691.2
0.22
0.22
19
30
22
1391
38360
691.3
0.23
0.23
19
31
21
1302
39662
691.3
0.24
0.24
19
32
19
1219
40881
691.4
0.24
0.24
20
33
18
1141
42022
691.4
0.25
0.25
20
34
17
1068
43090
691.5
0.25
0.25
20
35
16
1000
44089
691.5
0.25
0.25
20
36
15
936
45025
691.6
0.26
0.26
20
37
14
876
45901
691.6
0.26
0.26
20
38
13
819
46720
691.7
0.26
0.26
21
39
12
767
47487
691.7
0.27
0.27
21
40
11
717
48204
691.7
0.27
0.27
21
41
11
671
48875
691.8
0.27
0.27
21
42
10
628
49503
691.8
0.27
0.27
21
43
9
587
50090
691.8
0.28
0.28
21
44
9
549
50639
691.8
0.28
0.28
21
Page 59

10 YEAR STORM ROUTING
Hydrologic Data:
peak Qao = 35.5 cfs
To(10yr.)= 20.0 min.
K. = 13762.79
b = 1.2477
Pond Data:
Date: 37673
Project : Concrete Supply Charlotte North Plant
Project No.: 01806016
Location: Charlotte NC
Designed by: PJ
Pond Invert = 689.0
Riser Crest = 692.3
Orifice Invert =
690.0
Top of Dam =
694.0
Outlet Barrel Invert =
688.0
Outlet Structure:
Riser Length= 20 ft.
Riser Weir Coeff. = 3.3
Orifice Diameter = 2.00 in.
Orifice Entrance Coeff. = 0.6
Outlet Barrel Coeff. = 0.5
Outlet Barrel Diameter=24 in.
Time Increment =1
min.
TIME
INFLOW
STORAGE
STORAGE
ELEVATION OUTFLOW
ORIFICE
RISER CULVERT
(min)
(cfs)
(Cf)
(co
(ft)
(cfs)
(cfs)
(cfs) (cfs)
45
8
513
51152
691.9
0.28
0.28
21
46
8
480
51632
691.9
0.28
0.28
21
47
7
449
52081
691.9
0.28
0.28
21
' 48
7
419
52500
691.9
0.29
0.29
22
49
6
392
52891
691.9
0.29
0.29
22
50
6
366
53257
692.0
0.29
0.29
22
51
6
342
53599
692.0
0.29
0.29
22
52
5
319
53918
692.0
0.29
0.29
22
53
5
298
54216
692.0
0.29
0.29
22
54
5
278
54494
692.0
0.29
0.29
22
55
4
259
54753
692.0
0.29
0.29
22
56
4
242
54995
692.0
0.29
0.29
22
57
4
226
55220
692.0
0.29
0.29
22
58
4
210
55431
692.1
0.29
0.29
22
59
3
196
55626
692.1
0.30
0.30
22
60
e
3
182
55809
692.1
0.30
0.30
22
61
3
170
55978
692.1
0.30
0.30
22
62
3
158
56136
692.1
0.30
0.30
22
63
3
147
56283
692.1
0.30
0.30
22
' 64
2
136
56420
692.1
0.30
0.30
22
65
2
127
56546
692.1
0.30
0.30
22
66
2
118
56664
692.1
0.30
0.30
22
67
2
109
56773
692.1
0.30
0.30
22
' 68
2
101
56874
692.1
0.30
0.30
22
69
2
94
56968
692.1
0.30
0.30
22
70
2
87
57054
692.1
0.30
0.30
22
71
2
80
57134
692.1
0.30
0.30
22
72
1
74
57208
692.1
0,30
0.30
22
73
1
68
57276
692.1
0.30
0.30
22
74
1
63
57338
692.1
0.30
0.30
22
75
1
57
57396
692.1
0.30
0.30
22
' 76
1
53
57448
692.1
0.30
0.30
22
77
1
48
57497
692A
0.30
0.30
22
78
1
44
57541
692.1
0.30
0.30
22
79
1
40
57581
692.1
0.30
0.30
22
' 80
1
36
57617
692.2
0.30
0.30
22
81
1
33
57650
692.2
0.30
0.30
22
82
1
30
57680
692.2
0.30
0.30
22
83
1
27
57707
692.2
0.30
0.30
22
84
1
24
57731
692.2
0.30
0.30
22
85
1
21
57752
692.2
0.30
0.30
22
86
1
19
57771
692.2
0.30
0.30
22
87
1
16
57787
692.2
0.30
0.30
22
' 88
1
14
57802
692.2
0.30
0.30
22
89
0
12
57814
692.2
0.30
0.30
22
I
Page 60

Date:37673
Project : Concrete Supply Charlotte North Plant
- Project No.: 01806016
Location: Charlotte NC
�GQN Designed by: PJ
10 YEAR STORM ROUTING
Hydrologic Data:
Pond Data:
Outlet Structure:
peak Q,p = 35.5 cfs
Pond Invert =
689.0
Riser Length= 20 ft.
Tp (10yr.)= 20.0 min.
Riser Crest =
692.3
Riser Weir Coeff. = 3.3
K, = 13762.79
Orifice Invert =
690.0
Orifice Diameter = 2.00 in.
b = 1.2477
Top of Dam =
694.0
Orifice Entrance Coeff. = 0.6
Outlet Barrel Coeff. = 0.5
Outlet Barrel Invert =
688.0
Outlet Barrel Diameter =24 in.
' Time Increment =1 min.
TIME INFLOW
STORAGE
STORAGE
ELEVATION OUTFLOW
ORIFICE RISER CULVERT
(min) (cfs)
(cf)
(co
(ft)
(cfs)
(cfs) (Cfs) (cfs)
'
90 0
10
57824
692.2
0.30
0.30 22
91 0
9
57833
692.2
0.30
0.30 22
92 0
7
57840
692.2
0.30
0.30 22
93 0
5
57845
692.2
0.30
0.30 22
94 0
4
57849
692.2
0.30
0.30 22
95 0
2
57851
692.2
0.30
0.30 22
96 0
1
57852
692.2
0.30
PEAK 0.30 22
' 97 0
0
57852
692.2
0.30
0.30 22
98 0
-1
57851
692.2
0.30
0.30 22
99 0
-2
57849
692.2
0.30
0.30 22
100 0
-3
57846
692.2
0.30
0.30 22
' 101 0
-4
57841
692.2
0.30
0.30 22
102 0
-5
57836
692.2
0.30
0.30 22
103 0
-6
57830
692.2
0.30
0.30 22
104 0
-7
57824
692.2
0.30
0.30 22
105 0
-7
57816
692.2
0.30
0.30 22
Page 61

Date: Feb-07
Project: Concrete Supply Charlotte North Plant
Project No.: 01806016
Location: Charlotte NC
Designed by: PJ
100 YEAR STORM ROUTING
Hydrologic Data:
Pond Data:
Outlet Structure:
peak 0100 = 55.0 cfs
Pond Invert =
689.0
Riser Length= 20 ft.
Tp (100yr.)= 19.8 min.
Riser Crest =
692.3
Riser Weir Cooff. = 3.3
Ks=13762.79
Orifice Invert=
690.0
Orifice Diameter=2.00 in.
b = 1.2477
Top of Dam =
694.0
Orifice Entrance Coeff. = 0.6
Outlet Barrel Coeff. = 0.5
Outlet Barrel Invert =
688.0
Outlet Barrel Diameter =24 in.
' Time Increment =1
min.
TIME
INFLOW
STORAGE
I STORAGE
ELEVATION OUTFLOW
ORIFICE
RISER
CULVERT
(min)
(Cfs)
(co
(cf)
(ft)
(cfs)
(cis)
(cfs)
(cfs)
0
0
0
0
689.0
0.0
0.0
0.0
0
1
0
0
0
689.0
0.0
0.0
0.0
0
2
1
21
21
689.0
0.0
0.0
0.0
0
3
3
82
103
689.0
0.0
0.0
0.0
0
4
5
183
286
689.0
0.0
0.0
0.0
0
5
8
321
607
689.1
0.0
0.0
0.0
0
6
12
492
1099
689.1
0.0
0.0
0.0
0
7
15
692
1792
689.2
0.0
0.0
0.0
0
'
8
19
917
2708
689.3
0.0
0.0
0.0
0
9
24
1159
3868
689.4
0.0
0.0
0.0
0
10
28
1414
5282
689.5
0.0
0.0
0.0
0
11
32
1675
6957
689.6
0.0
0.0
0.0
0
'
12
36
1935
8892
689.7
0.0
0.0
0.0
0
13
40
2189
11081
689.8
0.0
0.0
0.0
0
14
44
2428
13509
690.0
0.0
0.0
0.0
0
15
47
2648
16157
690.1
0.0
0.0
0.0
13
'
16
50
2840
18998
690.3
0.1
0.1
0.0
14
17
52
3003
22000
690.5
0.1
0.1
0.0
15
18
54
3132
25132
690.E
0.2
0.2
0.0
16
19
55
3224
28356
690.8
0.2
0.2
0.0
17
'
20
55
3277
31633
690.9
0.2
0.2
0.0
18
21
55
3289
34922
691.1
0.2
0.2
0.0
18
22
53
3259
38181
691.3
0.2
0.2
0.0
19
23
52
3189
41370
691.4
0.2
0.2
0.0
20
24
49
3080
44450
691.6
0.3
0.3
0.0
20
25
46
2935
47385
691.7
0.3
0.3
0.0
21
26
43
2762
50147
691.8
0.3
0.3
0.0
21
27
41
2585
52732
691.9
0.3
0.3
0.0
22
'
28
38
2419
55151
692.0
0.3
0.3
0.0
22
29
36
2264
57415
692.1
0.3
0.3
0.0
22
30
33
2119
59533
692.2
0.3
0.3
0.0
23
31
31
1982
61516
692.3
0.5
0.3
0.2
23
32
29
1843
63359
692.4
2.4
0.3
2.1
23
33
27
1611
64970
692.5
4,9
0.3
4.6
23
34
26
1349
66319
692.5
7.4
0.3
7.1
24
35
24
1092
67411
692.6
9.8
0.3
9.4
24
36
22
856
68267
692.6
11.7
0.3
11.4
24
37
21
648
68915
692.6
13.2
0.3
12.9
24
Page 62

Date: Feb-07
Project : Concrete Supply Charlotte North Plant
Project No.: 01806016
Location: Charlotte NC
Designed by: PJ
100 YEAR STORM ROUTING
Hydrologic Data:
Pond Data:
outlet Structure:
peak 400 = 55.0 cfs
Pond Invert =
689.0
Riser Length= 20 ft.
T9 (100yr.)= 19.6 min.
Riser Crest =
692.3
Riser Weir Coeff. = 3.3
K, = 13762.79
Orifice Invert =
690.0
Orifice Diameter = 2.00 in.
b = 1.2477
Top of Dam =
694.0
Orifice Entrance Coeff. = 0.6
Outlet Barrel Coeff. = 0.5
Outlet Barrel Invert =
688.0
Outlet Barrel Diameter =24 in.
Time Increment =1 min
TIME
INFLOW
STORAGE
7 STORAGE ELEVATION OUTFLOW
(min)
(cfs)
(af)
(cf)
(ft)
(cfs)
38
20
470
69385
692.7
14.4
39
18
320
69705
692.7
15.2
40
17
196
69901
692.7
15.7
41
16
96
69997
692.7
16.0
42
15
15
70012
692.7
16.0 PEAK
43
14
-49
69962
692.7
15.9
44
13
-99
69863
692.7
15.6
45
12
-138
69725
692.7
15.3
46
12
-168
69557
692,7
14.8
47
11
-190
69368
692.7
14A
48
10
-206
69162
692.6
13.8
49
10
-217
68946
692.6
13.3
50
9
-224
68722
692.6
12.8
51
8
-228
68494
692.6
12.2
52
8
-229
68265
692.6
11.7
53
7
-229
68036
692.6
11.2
54
7
-227
67809
692.6
10.6
55
6
-224
67585
692.6
10.1
56
6
-220
67365
692.6
9.6
57
6
-216
67149
692.6
9.2
58
5
-211
66938
692.6
8.7
59
5
-205
66733
692.5
8.3
60
5
-199
66534
692.5
7.9
61
4
-194
66340
692.5
7.5
62
4
-188
66152
692.5
7.1
ORIFICE
RISER
CULVERT
(cfs)
(cfs)
(cfs)
0.3
14.1
24
0.3
14.9
24
0.3
15.4
24
0.3
15.6
24
0.3
15.7
24
0.3
15.5
24
0.3
15.3
24
0.3
14.9
24
0.3
14.5
24
0.3
14.0
24
0.3
13.5
24
0.3
13.0
24
0.3
12.4
24
0.3
11.9
24
0.3
11.4
24
0.3
10.8
24
0.3
10.3
24
0.3
9.8
24
0.3
9.3
24
0.3
8.8
24
0.3
8A
24
0.3
8.0
24
0.3
7.6
24
0.3
7.2
24
0.3
6.8
24
Page 63

Concrete Supply Company — North Charlotte Plant February 10, 2007
Charlotte, North Carolina Trigon Project No. 018.06-016
Exhibit #10 - Riser Flotation Computations
TRIGONENGINF.F.RINGCONsm7,ANTS, INC.
Page 64

Date: Feb-07
Project : Concrete Supply Charlotte North Plant
Project No.: 01806016
Location: Charlotte NC
Designed by: PJ
ITEMS I DATA ICOMMENTS
(RISER FLOTATION CHECK I
Inside Riser Dimensions
5.00 ft
x 5.00 ft
Riser Height
5.67 ft
Volume Outside Riser Wall Thickness 8 in.
162 cf
Uplift Force
113621bs.
Base Size
7.00 R
x 7.00 ft
Volume of Base Base Thickness = 12 in.
49 cf
Volume Walls
62 cf
Downward Force
16697 lbs.
Factor of Safety
1.47 1
Recommended Factor of Safety = 1.2
NOTE: Italicized Data is Calculated or Constants
Page 65

Date: Feb-07
Project: Concrete Supply North Charlotte Plant
Project No.: 018-06-005
Location: Charlotte, NC
Designed by: PJ
Exhibit #9 - STORM DRAIN FLOW TABULATION FORM
INLET CAPACITY CALCULATIONS
INLET TYPE"
INLET
NOS.
DA
(acres)
C
tc
I (inlhr)
Q
(cfs)
Opening
Area (so
Perimeter
1 Opening
Length I
H (max
head) (ft)
Flow
Capacity
cfs '
REMARKS
2'-0 x 3'-0 Grate Inlet
1-2
0.07
0.9
5.0
6.5
0.4
1.88
4.50
0.5
6.4 cfs
2'-0 x 3'-0 Grate Inlet
1-3
0.71
0.9
5.0
6.5
4.2
1.88
4.50
0.5
6.4 cfs
2'-0 x T-0 Grate Inlet
IA
0.46
0.9
5.0
6.5
2.7
4.01
11.51
0.5
6.4 cfs
2'-0 x T-0 Grate Inlet
1-6
0.26
0.9
5.0
6.5
1.5
4.01
11.51
0.6
6A cfs
Page 67

Date: Feb,07
Project: Concrete Supply North Charlotte Plant
Project No.: 018-05-005
Location: Charlotte, NC
Designed by: PJ
Exhibit # 10 -STORM DRAIN HYDRAULIC GRADE LINE COMPUTATION
1®®®®M®10=
®®�®
f:�7D
®®�NMM
Bend Coefficient
Degree K
0• 0
45' 0.2
90 • 1 0.4
IncDm Volume Coefficient
Percent K
0% 0
10% 0.08
30% 0.25
50% 033
100% 0.5
Page 68

Concrete Supply Company — North Charlotte Plant February 20, 2007
Charlotte, North Carolina Trigon Project No. 018-06-016 '
Exhibit # 11— Riprap Channel Computations
TRIGONENGINEERlNGCONSULTAwsT INC.
Page 69 1

Date: Feb-07
Project : Concrete Supply Charlotte North Plant
Project No.: 01806016
Location: Charlotte NC
Designed by: PJ
CHANNEL COMPUTATION SHEET
EAST CHANNEL
Factors JData lComments
Rainfall Information
Drainage Area Ad
0.64 Ac.
"C" Factor
0.9
il=4
6.50 inlhr
Flow =Qla
3.7cfs
Qlo=CIAd
Channel Information
Mannin s "n"
0.104
Ri ra - From NCDENR Erosion control Manual table 8.05 f
Side Slope M
5:1
Channel Sloes
0.25 fYft
Depth of Flow d
0.5 ft.
Bottom Width b
0.00 ft.
Top Width
5.10 ft.
W=b+2Md
Flow Area A
1.30 sift.
A=bd+MdA2
Wetted Perimeter P
5.20 ft.
P=b+2d 1+MA2 ^112
Hydraulic Radius R
0.25 ft.
R=A/P
Calculated Flow (Qc)
3.69 cfs
0 = 1.4861 n A S R
Calculated Veloci(VC)
2.84 f s
V=QIA
Calculated Shear Stress T
7.96 Ibslsf
T=62.4'ds
Minimum Depth of Channel Dc
1.0 ft.
I Dc=d+0.5' (approx.)
W
M —
1 d
�b�
Page 70 1

Date: Feb-07
Project : Concrete Supply Charlotte North Plant _
Project No.: 01806016
Location: Charlotte NC
Designed by: PJ
CHANNEL COMPUTATION SHEET
WEST CHANNEL
Factors JData Comments
Rainfall Information
Drainage Area(Ad) 4.9 Ac.
"C" Factor -
i=4 -
Flow =Qio 28.Ocfs See WQ Computations Page 47
Channel Information
Mannin s "n"
0.104
Ri ra - From NCDENR Erosion control Manual table 8.05 f
Side Slope M
2.5:1
Channel Sloes
0.25 fVft
Depth of Flow d
1.5 ft.
Bottom Width b
0.00 ft.
Top Width
7.50 ft.
W=b+2Md
Flow Area A
5.63 s .ft.
A=bd+Md"2
Wetted Perimeter P
8.08 ft.
P=b+2d 1+MA2 A112
Hydraulic Radius R
0.70 ft.
R=AIP
Calculated Flow Qc
31.57 cfs
Q = 1.4861 n A 5 R
Calculated Velocity Vc
5.61 f 5
V=QIA
Calculated Shear Stress T
23.40 Ibslsf
T=62.4"ds
Minimum Depth of Channel Dc
2.0 ft.
Dc=d+0.5' (approx.)
W
M =
1 d
�b�
Page 71

WArFq'
rA� 4 r
Michael F. Easley, Governor '
- William G. Ross Jr., Secretary
North Carolina Department of Environment and Natural Resources
Alan W. Kiimek, P.E. Director
Division of Water Quality
CERTIFIED MAIL
RETURN RECEIPT REQUESTED
December 14, 2006
Mr. Henry R. Batten, Executive Vice President
Concrete Supply Company
3823 Raleigh Street
Charlotte, North Carolina 28299
Subject: Notice of Violation and Recommendation for
Enforcement
Tracking #:.NOV-2006-SS-0013
Incident #: 200604372
Violation of 15A NCAC 2B.0211 (2) and 15A
NCAC 2B .0211 (3)(g)
Concrete Supply Company
North Plant -- 3823 Raleigh Street, Charlotte
Mecklenburg County, North Carolina
Dear Mr. Batten:
Chapter 143, Article 21 of the North Carolina General Statutes authorizes and directs the
Environmental Management Commission of this -Department to protect and preserve the water
resources of the State. The Division of Water Quality has the delegated authority to enforce
adopted pollution control rules and regulations.
On September 8, 2006, Mr. John McCulloch and Ms. Olivia Hutchins of the Mecklenburg
County Water Quality Program (MCWQP) conducted an investigation of the subject facility and
the adjacent sections of Little Sugar Creek. This investigation was conducted as part of a
cooperative working agreement between Mecklenburg County and the Division of Water Quality
and was in response to multiple citizen complaints of discoloration in Little Sugar Creek in the
vicinity of Belmont Avenue.
WDENR
The investigation by Mr. McCulloch and Ms. Hutchins found the following:
1. Wastewater from truck washing activities at the Concrete Supply North Plant was
None -orthCarolina
tura!!y
Mooresville Regional Office Division of Water Quality Phone [phone] Customer Service
Intemet: w w cwatercruali1v.orP, 610 East Center Ave, Suite 301 Mooresville, NC 28115 Fax [phone]
An Equal Opportunity/Affirmative Action Employer— 50% Recycled110°% Post Consumer Paper

Mr. Henry Batten
December 14, 2006
NOV-2006-SS-0013
Page 2
discharging into Little Sugar Creek at multiple locations. Personnel at the facility
reported that this discharge was a normal occurrence.
2. The investigation found discoloration of the water and significant accumulations of
concrete solids on the substrate of Little Sugar Creek in addition to the discovery of
dead fish (gambusia species). This constitutes a violation of "best usage of the
surface water." Specifically, 15A NCAC 2B .0211(2) states the following:
"waters shall be suitable for aquatic life propagation and maintenance of
biological integrity, wildlife, secondary recreation, and agriculture; sources of
water pollution which preclude any of these uses on either a short-term or long-
term basis shall be considered to be violating a water quality standard."
3. A pH reading of 8.10 Standards Units (SU) was taken in Little Sugar Creek
upstream of the Concrete Supply North Plant property line. This reading indicates
the background pH conditions in the stream prior to any impacts from the Concrete
Supply facility.
4. A pH reading of 8.69 SU was taken in Little Sugar Creek downstream of the
Concrete Supply North Plant stormwater discharge outfall SDOL
5. A pH reading of 10.98 SU was taken in Little Sugar Creek downstream of the
Concrete Supply North Plant stormwater discharge outfall SD02.
6. A pH reading of 11.19 SU was taken in Little Sugar Creek downstream of the
Concrete Supply North Plant stormwater�discharge outfall SD03. .
7. A pH reading of 9.78 SU was taken in Little Sugar Creek downstream of the
Concrete Supply North Plant property line. This reading indicates that the
stormwater/wastewater discharged from the Concrete Supply North Plant had
adversely impacted Little Sugar Creek. This constitutes a violation of 15A NCAC
2B .0211(3)(g) which states "...pH. shall be normal for the waters in the area,
which generally shall range between 6.0 and 9.0..."
To comply with the requirements of 15A NCAC 213 .0211(2) and 15A NCAC 2B
.0211(3)(g) it will be necessary to immediately discontinue all illegal discharge activity; to
collect, remove and properly dispose of the discharged material accumulated on the stream bed;
to restore all affected areas as nearly as may be to the conditions existing prior to the discharge;
and to implement corrective actions to eliminate the potential for recurrent illegal discharges.
Stream bank vegetation must be left in place except in those areas where access for clean up
equipment is necessary. These areas must be kept to an absolute minimum.
It is requested that you respond, in writing, to this Notice, indicating the measures taken
to collect and remove the discharge, to prevent future discharges, and to restore all affected areas.
The response should also indicate the disposal location for any removed discharged material,

Mr. Henry Batten
December 14, 2006
NOV-2006-SS-0013
Page 3
contaminated soils or waters and include a copy of the analytical documentation for the site
remediation. Please address your response to Mr. Bou-Ghazale by no later than.TanuaEy 12,
2007.
This letter is to notify you that the Mooresville Regional Office of the Division of Water
Quality is considering sending a recommendation for enforcement action to the Director of the
Division of Water Quality. The recommendation concerns the violations of 15A NCAC 2B
.0211(2) and 15A NCAC 2B .0211(3)(g) for causing or permitting waste, directly or indirectly, to
be intermixed with waters of the State in violation of the N.C. Water Quality Standards.
Violators are subject to penalties of up to $25,000 per day per violation. If you have an
explanation for the violations that you wish to present, please include it in the requested
response. Your explanation will be reviewed and if an enforcement action is still deemed
appropriate, your explanation will be forwarded to the Director along with the enforcement
package for his consideration.
If you have any questions concerning this matter, please do not hesitate to contact Mr.
Bou-Ghazale or me at [phone].
. Sincerely,
�,a re
1
, ohn Lesley
Surface Water Protection
Acting Regional Supervisor
cc: Danny Smith — NPS Assistance and Compliance Oversight
Bethany Georgoulias — Stormwater Permitting Unit
Central Files
Mecklenburg County Water Quality Program

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Michael F. Easley, Governor
William & Ross Jr., Secretary
I4orth Carolina Department of Environment and Natural Resources
DIVISION OF WA'
September 14, 2006
Mr. Henry R. Batten, Executive Vice President
Concrete Supply Corporation
3823 Raleigh Street
Charlotte, North Carolina 28299
Dear Mr. Batten:
Alan W. Klimek, P.E. Director
Division of Water Quality
Nntiee of Vinlatinn and Recommendatinn
For Enforcement
Tracking No. NOV-2006-PC-0179
Permit No. NCG 140041
Illegal Discharge
Concrete Supply Company
Cabarrus County, NC
Chapter 143, Article 21 of the North Carolina General Statutes (G.S.) authorizes and
directs the Environmental Management Commission of this Department to protect and preserve
the water resources of the State. The Division of Water Quality has the delegated authority to
enforce adopted water pollution control rules and regulations.
On September 7, 2006, Mr. Samar Bou-Ghazale of the Mooresville Regional Office (MRO)
of the Division of Water Quality (DWQ) observed a truck driver cleaning the chute of his concrete
truck and discharging the wastewater into the catch basin near the intersection of Eldorado -Drive
and Diamond place in Cabarrus County. Wastewater discharges without a permit are violations of
North Carolina General Statute 143-215.1 (a) (1), as follows:
(a) Activities for Which Permits Required.- No person shall do any of the following
activities unless that person has received a permit from the Environmental -
Management Commission and has complied with all conditions set forth in the
permit:
(1) Make any outlets into the waters of the State.
®VA N r hCarolina
NCDENR Xaturally
Mooresville Regional Office Division of Water Quality Phone [phone] Customer Service
Internet: www.ncwaterqualitLg 610 East Center Ave, Suite 301 Mooresville, NC 28115 Fax [phone]
An Equal Oppo+lunity/Affirmative Action Employer— 50% Recycletll10% Post Consumer Paper

Mr. Henry Batten
September 14, 2006
Page 2
To comply with the requirements of NCGS 143-215.1, it will be necessary to
immediately discontinue all illegal discharge activity and implement corrective actions to
eliminate the potential for recurrent illegal discharges.
. This office is requesting that you respond in writing to the noted violation within 15 days
of receipt of this letter. The response should be sent to the attention of Mr. Bou-Ghazale at the
letterhead address. The response should also address action taken to correct the problem and
cleanup the affected area.
This letter is to notify you that the Mooresville Regional Office of the Division of Water
Quality is considering sending a recommendation for enforcement action to the Director of the
Division of Water Quality. The recommendation concerns the violations of North Carolina
General Statutes 143-215.1(a)(1). Violators are subject to civil penalties of up to $25,000 per
day per violation. If you have an explanation for the violation that you wish to present,
please include same in the requested response. Your explanation will be reviewed and if an
enforcement action is still deemed appropriate, your explanation will be forwarded to the
Director along with the enforcement package for his consideration.
If you have any questions concerning this matter, please do not hesitate to contact Mr.
Bou-Ghazale or me at [phone].
Sincerely,
D. fl' za- -
D. Rex Gleason, P.F.
Surface Water Protection Regional Supervisor
cc: Danny Smith — NPS Assistance and Compliance Oversight
Bethany Georgoulias — Stormwater Permitting Unit
Central Files
MRO File Copy

{_ State of North Carolina
Department of Environment •
and Natural Resources
Division of Water Quality
James B. Hunt, Jr., Governor
Wayne McDevitt, Secretary NCDENR
Kerr T. Stevens, Director NORTH CAROLINA DEPARTMENT OF
ENVIRONMENT AND NATURAL RESOURCES
July 26, 1999
DAVID MOCK
CONCRETE SUPPLY CO- NORTH PLNT.
P.O. BOX 5247
CHARLOTTE, NC 28225
- Subject: Reissue - NPDES Stormwater Permit
Concrete Supply Co- North Pint.
COC Number NCG140041
Mecklenburg County
Dear Permittee:
In response to your renewal application for continued coverage under general permit NCG140000, the Division of
Water Quality (DWQ) is forwarding herewith the reissued stormwater general permit. This permit is reissued
pursuant to the requirements of North Carolina General Statute 143-215.1 and the Memorandum of Agreement
between the state of North Carolina and the U.S. Environmental Protection Agency, dated December 6, 1983.
The following information is included with your permit package:
* A copy of general stormwater permit NCG140000
* A Stormwater Pollution Prevention Plan (SPPP) Certification Form. Completion of this form is required to
certify that you have developed and implemented the SPPP as per the conditions of the permit. This form
must be completed and returned to the Division within 30 days of receipt of this letter.
DO NOT SEND the SPPP with the signed form.
* Five copies of the Analytical Monitoring form and five copies of the Qualitative Monitoring form
* A copy of a Technical Bulletin for the general permit which outlines changes in the permit, key requirements,
and addresses frequently asked questions
* A Certificate of Coverage
Your coverage under this general permit is not transferable except after notice to DWQ. 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 DENR or relieve the permittee from responsibility
for compliance with any other applicable federal, state, or local law, rule, standard, ordinance, order, judgment, or
decree.
If you have any questions regarding this permit package please contact Aisha Lau of the Central Office Stormwater
and General Permits Unit at [phone], ext. 578
Sincerely,
for Kerr T. Stevens
cc: Central Files
Stormwater and General permits Unit Files
Mooresville Regional Office
1617 Mail Service Center, Raleigh, North Carolina 27699-1617 Telephone [phone] Fax [phone]
An Equal Opportunity Affirmative Action Employer 50% recycled/ 10% post -consumer paper

STATE OF NORTH CAROLINA
DEPARTMENT OF ENVIRONMENT AND NATURAL RESOURCES
DIVISION OF WATER QUALITY
GENERAL PERMIT NO. NCG140000
CERTIFICATE OF COVERAGE No. NCG140041
STORMWATER AND PROCESS WASTEWATER DISCHARGES
NATIONAL POLLUTANT DISCHARGE ELIMINATION SYSTEM
In compliance with the provision of North Carolina General Statute I43-215.1, other lawful standards and
regulations promulgated and adopted by the North Carolina Environmental Management Commission, and the
Federal Water Pollution Control Act, as amended,
CONCRETE SUPPLY CO- NORTH PLNT.
is hereby authorized to operate a process wastewater treatment system, and is hereby authorized to discharge process
wastewater and stormwater from a facility located at
CONCRETE SUPPLY CO- NORTH PLNT.
3823 RALEIGH ST
CHARLOTTE
MECKLENBURG COUNTY
to receiving waters designated as a UT of Smith Creek in the Catawba River Basin
in accordance with the effluent limitations, monitoring requirements, and other conditions set forth in Parts I, II, III,
IV, V, and VI of General Permit No. NCG140000 as attached.
This certificate of coveraee shall become effective August 1, 1999.
This Certificate of Coverage shall remain in effect for the duration of the General Permit.
Signed this day July 26. 1999.
for Kerr T. Stevens, Director
Division of Water Quality
By Authority of the Environmental Management Commission

State of North Carolina
Department of Environment,
Health and Natural Resources
Division of Environmental Management
Jaynes B. Hunt, Jr., Governor
Jonathan B. Howes, Secretary
A. Preston Howard, Jr., P.E., Director
January 20, 1995
L T Hovis
Concrete Supply Co
P.O. Box 5247
Charlotte, NC 28225
Arirn
IDEHNf=1
Subject: General Permit No. NCG 140000
Concrete Supply Co
COC NCG 140041
Mecklenburg County
Dear L T Hovis
In accordance with your application for discharge permit received on November 23, 1994, we are
` - forwarding herewith the'subject certificate of'coverage'to-discharge under the subject -state-- NPDES-general - --`
-permit.-This-permit-is issued-pursuantto the requirements -of -North Carolina General Statute-143=215 A -and - -
the Memorandum of Agreement between North Carolina and the US Environmental Protection agency dated
December 6, 1983.
If any parts, measurement frequencies or sampling requirements contained in this permit are
unacceptable to you, you have the right to request an individual permit by submitting an individual permit
application. Unless such demand is made, this certificate of coverage shall be final and binding.
Please take notice that this certificate of coverage is not transferable except after notice to the Division
of Environmental Management. The Division of Environmental Management 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 Environmental Management 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.
If you have any question concerning this permit, please contact MS. AISHA LAU at telephone number
919/733-5083.
Sincerely, Signed By
priginal Si S
colleen Hullins
A. Preston Howard, Jr. P.E.
cc: Mooresville Regional Office
P.O. Box 29535, Raleigh, North Carolina 27626-0535 Telephone [phone] FAX [phone]
An Equal Opportunity Affirmative Action Employer 50% recycled/ 10% post -consumer paper

STATE OF NORTH CAROLINA
DEPARTMENT OF ENVIRONMENT, HEALTH, AND NATURAL RESOURCES
DIVISION OF ENVIRONMENTAL MANAGEMENT
GENERAL PERMIT NO. NCG140000
CERTIFICATE OF COMERACAE No NC 140041
STORMWATER 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,
Concrete Supply Co.
is hereby authorized to discharge stormwater from a facility located at
Concrete Supply Co. - North Plant
3823 Raleigh St.
Charlotte
Mecklenburg County
to receiving waters designated as an unnamed tributary to Smith Creek in the Catawba River Basin
in accordance with the effluent limitations, monitoring requirements, and other conditions set forth in Parts I, I1, 1II
and IV of General Permit No. NCG 140000 as attached.
This Certificate of Coverage shall become effective January 20, 1995.
This Certificate of Coverage shall remain in effect for the duration of the General Permit.
Signed this day January 20, 1995.
.r
Coleen �J. 5tliiil��
A. Preston Howard, Jr., P.E., Director
Division of Environmental Management
By Authority of the Environmental Management Commission

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FACILITY
Concrete Supply Co. - North Plant
COUNTY
Mecklenberg
N P DES
NCG140041
MAP#
F15SE
DSN FLOW
NA
SUB BASIN
03-08-34
LATTITUDE
350 15' 14"
LONGITUDE
800 47' 58"
RECEIVING STREAM
UT to Smith Creek
STREAM CLASS
C
DISCHARGE CLASS
Stormwater
EXPIRATION DATE
7/31/99