NCG140102_COMPLETE FILE - HISTORICAL_20080115

STORMWATER DIVISION CODING SHEET
NCG PERMITS
PERMIT NO.
DOC TYPE HISTORICAL FILE
❑ MONITORING REPORTS
DOC DATE ❑ p! �D 0 O) 15
YYYYMMDD

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 15, 2008
Mr. Tommy Charles
Commercial Ready Mix Products, Inc.
100 Hayes Street
Ahoskie, North Carolina 27910
Subject:. Authorization to Construct
Commercial Ready Mix — Ahoskie plant
NCG140102
Hertford County
Dear Mr. Charles:
The Division of Water Quality (DWQ) received your request to construct stormwater and
wastewater controls at the subject facility on May 18, 2007, and again with revisions on August
20, 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 concrete three -bay
recycle system, a Fortrans automated pH correction unit, a recycle pump and recycle line,
demolition of an existing truck wash pad and relocation of a new pad north of Hayes Street, and
other related incidental features, all in the configuration and location shown on.the approved plan
and details, and in accordance with the calculations submitted.
Typically we would require that you notify DWQ's Washington 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, if the facilities have already been completed, please
contact the regional office for a post -construction inspection this month.
Similarly, upon completion of construction and prior to operation of the authorized controls, 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 NCG140102, 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 site plan, details, and calculations.
You must maintain on file a copy of the approved site plan, details, and calculations for the life of
the facility.
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.
NNao Carolina
turally
North Carolina Division of Water Quality 1617 Mail Service Center Raleigh, NC 27699-1617 Phone [phone] Customer Service
Internet: www.newaterquality.org Location: 512 N. Salisbury St. Raleigh, NC 27604 Fax [phone]
An Equal Opportunity/Affirmative Action Employer — 50% Recycled110% Post Consumer Paper

Mr. Tommy Charles
Page 2 of 3
January 15, 2008
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,
Coleen H. Sullins
Attachment: Engineer's Certification
Enclosure: Approved plans, details, and calculations
cc: Darin McClure, Mid -Atlantic Assoc, 409 Rogers View Ct, Raleigh, NC 27610, letter only
DWQ Washington Regional Office, approved set
DWQ Central Files, letter only
SPU file NCG140102, approved set

M fl-Tommy' Charles
P,.3of3
January 15, 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

MID -ATLANTIC
ASSOCIATES, INC.
Engineering & 8nvironinental Solutions
409 Rogers Vier Court !Raleigh /Nortli Carolina /27610
800-486-7568 / 919 -250- 9918 / 919-250-9950 Facsimile
lrwistntaawdine.com
May 15, 2007
Mr. Ken Pickle
North Carolina Department of Environment and Natural Resources
Division of Water Quality
Stormwater and General Permits Unit
1617 Mail Service Center
Raleigh, North Carolina 27699-1617
Approved Stormwater Permit Documents
Subject: PLANS AND SPECIFICATIONS Construction 1y the accordance with these documents is
J required by me stormwater permit. Norm Carolina
ner
COMMERICAL READY MIX PRODUCTS, IN= VQ=?�sys nform with
100 HAYES STREET puns and specs; y COntormtty with ma
AHOSKIE, NORTH CAROLINA P8R„it # o to Z Date��t
MID -ATLANTIC PROJECT NO.00OR1814.Oly lfAP _ W Division of star ]uaiity
Sheet # Revision flats
Dear Mr. Pickle:
Attached please find three sets of conceptual plans, specifications and supporting
documentation for the proposed recycling system at the above referenced site. The
objective of the proposed recycle system is to recycle certain process waters generated at
the facility along with a portion of the stormwater. It is our understanding that after review
and approval of this submittal, an Authorization to Construct (ATC) will be issued by your
office. Several things to highlight are included below.
• The Ahoskie Plant consists of four drainage areas (Drawing 1). The proposed
recycling system is located in drainage area 3.
• Runoff from drainage area 3 at the site (Drawing 1) will flow into a three chambered
recycle system.
• The recycle system is designed to effectively treat stormwater/process wastewater
(See Calculations in Attachment B).
• No industrial activities are scheduled to take place in drainage area 3 other than
truck rinsing, truck wash out and wet/dry reclaim activities. Trucks will wash out
directly into the first bay of the recycle system. Water draining from the wet/dry
reclaim area will also wash directly in the first bay of the recycle system.
• Sediment removed from the recycle system will be staged in the wet reclaim area
and allowed to harden. Once it hardens, the material will be taken off site for
beneficial fill. Material will be removed from the system during dry periods.

Plans and Specifications May 15, 2007
Commercial Ready Mixed Products, Inc. - Ahoskie Plant Page 2
100 Hayes Street
Ahoskie, North Carolina
We appreciate your assistance with this matter. If you have any questions or need
additional information, please do not hesitate to call me at 250-9918.
Sincerely,
PLAID -ATLANTIC ASSOCIATES, INC.
Wayne andolph, Jr_
Project Scientist
cc: Mr. Tommy Charles, CRMP
Mr. Dan Boone, The Wooten Company
1814, 0115-1-07 Design Cover LetterIWER/aso
MID -ATLANTIC
ASSOC IATES.INC.
Engineering & liuvirarrnlrnful 5nlulinns

MID -ATLANTIC
ASS0CIATES,INC.
Engineering & Environmental Solutions
409 Rogow Wew Courl /Raleigh /North Carolina /27610
800-486-7568 / 919-250- 9918 / 919-250 -9950 Facshnde
August 16, 2007 wwwnuraonline.com
Mr. Ken Pickle
North Carolina Department of Environment and Natural Resources
Division of Water Quality
Stormwater and General Permits Unit
1617 Mail Service Center
Raleigh, North Carolina 27699-1617
Subject: RESPONSE TO ADDITIONAL INFORMATION REQUEST
COMMERICAL READY MIX PRODUCTS, INC — AHOSKIE PLANT
100 HAYES STREET
AHOSKIE, NORTH CAROLINA
MID -ATLANTIC PROJECT NO. 000R1814.01
Dear Mr. Pickle:
This letter and conceptual plan are submitted in response to our phone conversation on August 16:
200. During the conversation you requested that we update the conceptual plans to include:
The location of the Fortrans unit;
The existing truck rinse station as hatched out and/or "To Be Demolished"; and
A note on the plans that wastewater/process discharges may occur at outfalls 1 (Plant
Rinse Down Water), 2 (Stockpile Irrigation), and 4 (Stockpile Irrigation). However, we
anticipate these discharges to meet permit effluent limits. In the event sampling indicates
permit limits cannot be met at these outfalls, the water will be routed to the treatment
system.
We appreciate the opportunity to submit"this additional information. If you have any questions or
need additional information, please do not hesitate to call us at 250-9918.
S,ncer ely,
MID -ATLANTIC ASSOCIATES, INC.
W(-4 ne andolph, Jr.
Project Scientist
Darin M. McClure, PE
Principal Engineer
Attachment: Drawings Approved Stormwater Permit Documents
Construction in accordance with these documents is
required by the storrnwater permit. North Carolina
cc: Mr. Tommy Charles, CRM P rules require that the stormwater system designer
Inspect during construction; certify conformity with the
ptans and specs, cmftanify
1814.0118-15-07 Response to Additional Info Request/WERlasoPaw P? -- Cate I
Y.
NC Division of ter ueiity
Shoot q Rovieion Do_ —

NOTE: WASTEWATER/PROCESS
DISCHARGES MAY OCCUR AT '
R�CiL4Rp SjREE7 OUTFALLS 1 (PLANT RINSE DOWN
1 WATER), 2 (STOCKPILE IRRIGATION)
AND 4 (STOCKPILE IRRIGATION);
— HOWEVER, WE ANTICIPATE THESE
T I DISCHARGES TO MEET PERMIT
1 EFFLUENT LIMITS. IN THE EVENT
I Fl� l SAMPLING INDICATES PERMIT LIMITS
SAND ' I CANNOT BE MET AT THESE
OUTFALLS, THE WATER WILL BE
TOP 1 cYa j ROUTED TO THE TREATMENT
SOIL I SYSTEM.
Iz
GRAVEL y I`
1 1 U
MORTAR
SAND `
I I , 48
I GRAVEL I
— rr
DY WET
l I / RECLAIM 4
1 4 RACK BERM/SCALE TO
DIRECT RUNOFF TO
FIRST BASIN
0-"GRAVEL
/' f
1
PIPE AND /� k
BLOCK A'
STORAGE I• ,
AREA I j ��1 ' BERM
I
� 1 .3
EMPPIL YEE PAR
]NO _ 4—
0 FLOW TO
49'
50' FLOW TO
D UTFALL 4 FLOW TO
mra STREET OUTFALL 1
ce �—
_ I (2) 2,000—GALLON
OFFICE ADMIXTK REO ASTs h
I 1 STORAGE (UNCOVERED) 49' y
COVERED
I
SAN FOR ADMIXTURE TANKS I � � \•l f �
AIR \ 1 EXISTING TRUCK
COMPRESSOR _ MHOTR RINSE STATION
+a \�(TO BE
TANK I , (PROPOSED ENEWSLOCATION
PROPANE SAN? PARKING TRUCK ` NORTH OF HAYES STREET)
TANK
D z I
/ ! CONCRETE �
GRAVEL/SAND
570RMWATER
/ - OUTFALL h
gQ,�iti`raaaapaa,t@ / / DMDE
�HrliARf(
P /
! I
STor E / Lr
- 40 L(/ RETAINING O' I
G <!` WALL I
fa SAND ' GRAVEL, I' /
4i'le
414.
�►
F, �t a SAND / /
STONE — FLOW TO
r O OUTFALL 2
48' U
49' fTRST STREET
LEGEND
y SPILL/DRAINAGE FLOW DIRECTION A r rermlt Documents
PROCESS WATER FLOW DIRECTION nstruction in accordance with these documents is
lO OUTFALL LOCATION requited by the stormWater permit. North Carolina
rules require that the stormwater system designer
CB STORM WATER CATCH BASIN Inspect during Construction; Certify conformity with the
® STORM DRAIN/DROP INLET Plana and specs;
NORFOLK do SOUTHERN RAILWAY Permit #XIC6 / /p y Del@ / zz of
PROPERTY BOUNDARY by_4!C� NO O Wlt}lotl of W940r du011ty 0 60,
--_-__----- BERM shoal 0. t�laion o&(A
. • — • — • — TOPOGRAPHIC CONTOUR LINES APPROXIMATE SCALE: 1'= 60'
ID -ATLANTIC
ASSOCIATES, INC.
Engineering & Environmental Solutions
SITE MAP
COMMERCIAL READY MIX
PRODUCTS, INC.
100 HAYES STREET
AHOSKIE, NORTH CAROLINA
DRAWN BY: DATE: AUGUST 2007
DRAFTING CHECK
BY: (�/07L JOB N0: 00OR1814.01
ENGINEER CHECK CAD # 01--181401-01
BY:
APPROVED BY: DWG N0: 1
1 REFERENCE: HERTFORD COUNTY TAX MAP; MID —ATLANTIC FIELD NOTES.

�,.° .
.Y as
- .. I �� �rl� '1: t
H.�f � _ . •isle• ...
r. +
• �1
0
;:
.. t. +r `•. `iI
. t •.
• � K
_. Y .

48.
GRAVEL LEGEND T
0
/ 1 OUTFALL LOCATION O O q I
PIPE
D BLOCK / BERM/ 1 GRASS STORM WATER CATCH BASIN
AREA STORAGE \ ,/SWALE BERM STORM DRAIN/DROP INLET ® D O CC)
N
NORFOLK do SOUTHERN RAILWAY C� O `—
PROPERTY BOUNDARY
BERM ------ Q Q O
1 NORMALLY OPEN NO m p CO
NORMALLY CLOSED NC �p U Q
�E ./PH BALL VALVE -
W CHECK VALVE
(ARRI INDICATING FLOW DIRECTION)
LS. ® 1 Y Y
' HIGH LEVEL ALARM U Ld
C]
H w £ Hm =�v
JOLOW LEVEL SWITCH m � 0 V Of 0
���ul
EMPLOYEE r L E rc c m o zLAJ
PARKING E cicic c + SACKFLOW PREVENTER E U 8 3 Z
V4+ PH CONTROL SYSTEM 0-OE f P @ a te m m z m ¢ m
I ly ENDS IPE CAPPED FOR FUTUREOUSE� TH PRESSURE GAUGE
+ + "'� WASTEWATER FROM SOUTHERN FLOW DIRECTION m E — ^
+ , PORTION OF SITE MAY BE ro
�� PUMPED TO TREATMENT SYSTEM ELECTRICAL CONTROLS E -;
TRENCH WILL BE CONSTRUCTED W� - 8 , 1 c f
TO APPLICABLE DOT AND TOWN i IF PERMIT LIMITS CANNOT BE a g U)
OF AHOSKIE STANDARDS. MET. FORTRANS UNIT 3 QJ LL.I X Z
r�TRENCH p _ $ �' O Of
H4YFS SMET t c= IM Q 0 O o f Q U)
LJ
02� mow. �QQZ(,
Ilt 4 �'� c W
_ QZ�Vj IE O
acoj4 m O_
f ` Go I—� J U �O Q
kj 1 QU�2�i Qi' Q0 J
O Lil c.i 2 Z Vr LLJ
>- > 0_' O
+ OY U
+ r TO PLANTS F O — V)
CAL+ + r + OFFICE ELECTRI fErEJ � (2) 2,000—GALLON Lu Z C) Z
E E ASTs ttttttttrtyet V) Q
'TO
WATERMUNICIPAL
8P NC
F
NO i
STORAGE I TO I
BUILDING P
O ADMIXTURE
a
(UNTANK AT
COVERED)
COVERED W ;z
STORAGE TRAILER D
AIR FOR ADMIXTURE TANKS SAND 4] O
COMPRESSOR Ci
o o
HOT ' w
WATER TANK W
O � � � �
n
.PROPANE 0 EXISTING TRUCK Q
TANK RINSE STATION 1 • ALL PIPING 2" SCH 40 PVC W
SAND PARKITRUNG (TO BE DEMOLISHED) UNLESS OTHERWISE NOTED. a~j
0 LJ (PROPOSED NEW LOCATION 2. CONCRETE— 4000psi. 4J w
NDRTH OF HAYES STREET) ZZ
SAND CONCRETE 0 30' lei
LLJ
SCALE: 1 "— 30' w (Y
r

U

A
Approved Storrnwater Permit Documents
Construction in aocordance with these documents is
required by the stormwater peffnk North Carolina
rules require that the stormwater system designer
Inspect during construction; certify conformity with the
plans and specs; and m
Permit # 7tf Date r S O
by_/.&e NC Division of Water buality
Sheet # Revision Date
ID -ATLANTIC
ASSOCIATES, INC.
Engineering S- Environmental Solutions
(REFERENCE: MID —ATLANTIC FIELD NOTES.
CROSS—SECTION A —A'
COMMERCIAL READY MIX PRODUCTS, INC.
AHOSKIE PLANT
AHOSKIE, NORTH CAROLINA
DRAWN
BY:
CHECK:
07 -
5.5'
NOT TO SCALE
DATE: MAY 2007
JOB NO: DOOR1814.01
CAD NO: 01-181404-01
DWG NO: 3

CRMC - Ahoskfe Plant Calculations - Job No. 000R1814.01
Performed by:
Checked by.
' Process Wastewater Generated vs. Water Used at the Site f7hroughputlWater Balance)
Average work day
= 10 hours
Wash water produced
= 5 gaI1CY
Capacity of plant
= 350 CYlday
Wash water per day
- 1750 gallons
1 gallon
0.133581 cf '
Wash water per day
= 234 cf
Water/cu. Yd.
Of Concrete
= 25 gallons
Water UselDay
8,750
Wafer needs exceed amount of wastewater produced each day.
Volume of Washdovim/F vcfina Pft (V2i
(Truck and plant washdown)
55 gallons of wash water per truck, Truck
capacity 11 CY of concrete (55 gallons
11 CY - 5 gallons of wash water
produduce per CY of concrete) ez L— <r-
Number of Basins
3
Basin Width (ft.)
12
Effective Depth (it,)
5
Depth Before Overflow of Basins
Length of Bottom (it.)
30
Length of Flat Bottom
Length of Top of Basin 1 when lull (Ft.)
56
Length of Top of Basins 182 when full (Ft.)
100
Length of Top of Basins 1-3 when full (Ft.)
150
Slope (x 10 1)
4
Volume of Each Basin (cu. FL)
2100
1 cu. FL. = 7.A61 gallons
Volume (gatlons)
15,710
Vbl
Surface Area of Basin 1 when full (Sq. Ft.)
600
Surface Area of Basins 182 when full (Sq. FL)
1200
Surface Area of Basins 1-3 when full (Sq. Ft.)
1800
_
Analysis below assumes all basins are full when the 25-year storm occurs. The 25-year storm will produce a peak runoff rate into the system, By calculating
setting limes based on the peak runoff rate, we are assuming a worst case scenario, Note: Table references below are taken from Erosion and Sediment
Control Planning and Design Manual by the NC Sedimentation Control Commission, the INC Department of Environment and Natural Resources, and the INC
Agricultural Extension Service.
Determination of Peak Runoff Rate Uslna the Rational method
Q=CiA
Given:
Drainage area (acres)
0.174 " will be a total of areas below
Grass covered berm (acres)
0.001
Concrete drainage area (acres)
0.125
Concrete recycling pit (acres)
0.048
Maximum slope length (Ft.)
. 90
Average Slope (% fool per fool)
0.022
Location (Table 8.03c) Washington, NC
Find:
Peak runoff rate from 25-year frequency storm
Solution:
(1) Drainage area:
0.174
(2) Determine runott coefficient, C.
Calculate Weighted Average
Area
C from Table 8.03b
'Grass covered berm
0.001
x 0.45 =
0.00045
"Concrete drainage area
0 125
x 0,95 =
0,11875
"Concrete recycling pit
0.048
x 1
0.04E
0.174
0. f 672
C= 0.96091954 t/
Note: Tc calculated from "Time of concentration of small drainage basins graph' attached.
For graded areas use C value range for smooth, bare packed soil (Table 8.03b) /
— Draft design indicates drainage area will be compacted gravel. Runoff coefficient for concrete was used as a conservative number.
"" When the concrete recycling pit is full of water the runoff coefficient is estimated to be 1, ✓
To = 0.8 minutes I, -
Refer to Table 8.03c Intesity Duration Frequency - Washington, NC
25 year storm with a 5 minute duration is 9.48 inches/hour -This numb r (9.48 incheslhour) is a conservative
number and will be used for intensity factor, i.

Calculate Peak Runoff for Site
Calculate the peak runoff at the drainage area that occurs during a particular design storm event
Chi C..-
Op =peak rare of runoff in cubic feel per second (cis)
C = coefficient of runoff
i = intensity of rainfall in inches per hour
y
C , [ 9 +q SX Y 1 IA
A = drainage area in acres
\\\
i i,
6
Coefficient at runoff; C =
0,96P19A
`
Rainfall intensity; i =
nchesihour 25 year storm 'From E85C manual
(Washington)
Qrainage Area =
acesPeak
Runoff; Op -
cis
Runoff Volume =
I 00 cf (Soo Hydrograph)
=
755.5B gallons
2859.67 liters
7
Calculate Discharge Characteristics from Basin 1
h
Weir Length =
1.5 it
j/, � jI /1 ►
(+ •�� )l�r�r— ��
Calculate depth of Flow Over the Discha Me Weir
Francis formula
------ - ry ��
H = J0!(3.1-L)J-0.6667
H = depth of flow over weir in feel
�� p
O = flow in cf8
C,fW
L - length of weir
a �j
Normal operation (no rain) On =
0,006 cis
Fin =
O,D12 ft
During rain event Qp =
1.59 Us Jrna!`C7(
Hp =
0.488 it
Calculate Critical Velocity of Particles In Basin 1 During Peak Flow
Worse case scenario for particles discharging off site occurs during peak flow conditions.
Vc = 0p7A
Vc = Crificai velocity in hisec
Op = Peak Flow
A = Average surface area of basin
Critical velocity (Vc) = 0.0264176 ftlsec
Retention time of particle (Rp) during peak flow = Average Basin Length at Surface ! Vc = 50'Nc
Retention Time (Rp) = 18927 seconds
Cnucal settling velocity (Vc') for particle to settle to weir (rain) = Hp/Rp
Critical settling velocity (Vc') = 2,5782E-05 ftlsec
Determine which solids will discharge over weir
Our analysis will focus on cement particles due to their small size. Cement particles are the least
likely to settle and therefore the most likely to discharge from the site.
Calculate particle settling velocity (Vp) and compare it to Vc'- If Vc' > Vp, then those solids will discharge over the weir.
Formula for Calculating Particle Settling Velocty (Vp);
Particle Settling Velocty (ftlsec), Vp = g(pt-p2)d'2l18u Stokes Law
g = gravity = 32.2 fVsec'2
d = diameter of
cement particle (ft)
1 micron = 3.28084E-06 it
pl = density of cement = 94 Iblct
p2 - density of water = 62.4 Iblcf
u = viscosity of water = 0.0005981 Iblft-sec

Source , NISTIR 6931 'Analysis of the ASTM hound -Robin Test on Panicle Size Dlstriblu cin of Portland Cement. Phase II
Settling
Critical
Diameter
Settling
Discharge over
(microns)
size distribution
X�
diameter {ft)
Velocity; Vp
Velocity;
Weir (YIN)
(Wsec)
(Rlsesec)
1
4.7
4.7
3.28084E-06
1.0173E-06
2.5782E-05
Y
1.5
2.8
7.3
4.92126E-06
2.289E-06
2.5782E-05
Y
2
4,8
12.1
6.56168E-06
4,0694E-06
2.5782E-05
Y
3
5.6
17.7
9.84252E-05
9.1561E-06
2.5782E-05
Y
4
4.6
22.3
1.31234E-05
1.6277E-05
2.5782E-05
Y
6
7.6
29.9
1-96850E-05
3.6624605
2.5782E-05
N
a
6
359
2,62467E-05
6.511E-05
2.5782E-D5
N
12
10.5
46.4
3.93701E-05
0,0001465
2.5782E-05
N
16
8.2
54.6
5.24934E-05
0.00026044
2.5782E-05
N
24
13,8
68.4
7.67402E-05
0,00058599
2.5782E-05
N
32
10,3
78.7
1.04987E-04
0.00104176
2.5782E.D5
N
48
12,4
91.1
1.57480E-04
0.00234395
2.5782E-05
N
64
5.2
96.3
2.09974E-04
0.00,416703
25782E-05
N
96
2.8
99,1
3.14961E-04
0.00937582
2.5782E-05
N
128
0.4
99,5
4.19948E-04
0.0166613W
2.5782E-05
N
5128
0.5
100
-
2.5782E-05
N
Based on these calculations, particles less than
4 microns will discharge over the weir.
Calculate Discharge Characteristics from Basin 2
Weir length =
t.5 fl
Calculate depth of Flow Over the Discharte Weir
H = (0/(3.1'L)]A0.6667
Francis formula
H = depth of flow over weir in feet
0 = flow in cts
L - length of weir
Normal operation (no rain) On =
0.006 cfs
Hn =
0.012 ft
During rain event 4p =,
1.59 cis
Hp =
0.488 ft
Calculate Critical Velocity of Particles Flowing Through Basins 1 & 2
Worse case scenario for particles discharging off site occurs during peak flow conditions.
Vc = eplA
Vc = Critical velocity in Wsec
Op = Peak Flow
A = Average surface area of basin
Critical velocity (Vc) = . 0.001320BB ftlsec
Retention time of particle (Rp) dung peak Now = Average Basin Length at Surlace ! Vc = 100'Nc
Retention Time (Rp) = 75707 seconds
Critical settling velocity (Vc') for particle to settle to weir (rain) = Hp/Rp
Critical settling velocity (Vc') = 6.4455E-06 tVsec
Determine which solids will discharge over weir
Our analysis will focus on cement particles due to their small size. Cement particles are the least
likely to settle and therefore the most likely to discharge from the sire.
Calculate particle settling velocity (Vp) and compare it to Vc'. If Vc' > Vp, then those solids will discharge over the weir.
Formula for Calculating Parlicle Settling Velocity (Vp):
Particle Settling Velocity (Wsec), Vp = g(p1-p2)d'2718u Stokes Law
g = gravity =
32.2 Wsec'2
d = diameter of
cement particle (1t)
1 micron =
3-28084E-06 It
p1 =density of cement =
94 Iblcf
p2 = density of water =
62.4 Iblcf
u = viscosity of water =
0.0005981 Iblit-sec

Source. NISTIR 6931 "Analysis of the ASTfA Round -Robin Test on Parhde Size Distribtuion cf Portland Cemenl. Phase it
-
Critical
Diameter
Settling
Settling
Discharge over
size distribution
diameter (ft)
Velocity; Vp
(microns)
(lV l
Velocity; Vc'
Weir (YIN)
ttlsec
1
4.7
4.7
3.28084E-06
1.0173E-06
6,4455E-06
Y
1-5
2.6
7.3
4.92126L-05
2.289E-06
6,4455E-06
Y
2
4,8
12,1
6,56168E-06
4.0694E-06
6-4455E-06
Y
3
5.6
17-7
9,84252E-06
9.1561E-06
6,4455E-06
N
4
4-6
22.3
1.31234E-05
1.6277E-05
6.4455E-06
N
6
7,6
29,9
1.96850E-05
3,6624E-05
6.4455E-06
N
8
6
35.9
262467E-05
6-511E-05
6 4455E-05
N
12
10.5
48.4
3.93703E-05
0,0001465
6.4455E-06
N
16
8.2
54.6
5.24934E-05
0.00026044
6.4455E-05
N
24
13.8
68.4
7.87402E-05
0,00058599
6.4455E-06
N
32
10-3
7B.7
1.04987E-04
0-00104176
6.4455E-06
N
48
12A
91,1
1,57480E-04
U0234395
6.4455E-06
N
64
5.2
96.3
2.09974E-04
0.00416703
6.4455E-06
N
96
2.8
99.1
3.14961E-04
0.00937582
6.4455E-06
N
128
0.4
99.5
4.1994SE-04
0.01666B12
6.4455E-06
N
>128
0.5
100
6.4455E-06
N
Based on these calculations, particles less than 3 microns will discharge over the weir of Basin 2.
Calculate Discharge Characteristics from Basin 3
Weir Length = 1,5 it
Calculate depth of Flow Over the Discharge Weir
H = (Q!(3.I-L)r^0.6667
Francis formula
H = depth of Bow over weir in feet
0 = Row in cis
L - length of weir
Normal operation (no rain) On =
0.006 cis
Hn =
0.012 it
During rain event Op =
1.59 Us
Hp =
0-488 it
Calculate Crlticai Velocity of Particles Flowing Through Basins 1,_2 8 3
Worse case scenario for particles discharging off site occurs during peak Bow conditions.
Vc = Qp/A
Vc = Critical velocity in fVsec
Op = Peak Flow
A = Average surface area of basin
Critical velodly (Vc) _ 0.00088059 fVsec
r Retention time of partide (Rp) during peak flaw = Average Basin Length at Surface 1 Vc = 150'Ne
Retention Time (Rp) = 170341 seconds
Critical settling velocity (Vc') for partide to settle to weir (rain) = Hp/Rp
Critical settling velocity (Vc') = 2.8647E-06 tllsec
Determine which solids will discharge ov_er_weir
Our analysis will focus on cement particles due to their small size- Cement particles are the least
likely to settle and therefore the most likely to discharge from the site.
Calculate particle settling velocity (Vp) and compare it to Vc'. If Vc' > Via, then those solids will discharge over the weir.
Formula for Calculating Particle Settling. Velocity (Vp):
Particle Settling Velocity (ftlsec), Vp = g(pl-p2)d'2118u Stokes Law
9 = gravity = 32.2 fVsec'2
d = diameter of
cement particle (it)
1 micron = 3.28084E-06 It
p1 = density of cement = 94 Iblcf
p2 = density of water = 62.4 Iblcf
u = viscosity of water = 0,0005981 Iblfl-sec

Source NISTIR 6931 "Analysis of
the ASTM Round-Rooin
TesI on Panicle Size Distnbluion of Portland Cement Phase II
Settling
Critical
Diameter
Settling Discharge over
(mlcransl
size distrlbutlon
%c
diameter (nj
Velocity; Vp
Velocity; Vc'
Weir (Y)N)
Iftlsec)
trtlsecl
1
4.7
4.7
3.28084E-06
1.1173E-06
2.8647E-06
Y
1.5
2.6
7.3
4.92126E-06
2.289E-06
2.8647E-06
Y
2
4.B
12.1
6.56168E-05
40694E-06
2.8647E-06
N
.3
5,6
17.7
9.84252E-06
9.1561E-06
2.8647E-06
N
4
4,6
22,3
1.31234E-05
1.6277E-05
2.8647E-06
N
6
7,6
29.9
196850E-05
3 6624E-05
2.B647E-06
N
8
6
35.9
2.62467E-05
6 511E-05
2.8647E-06
N
12
10.5
46.4
393701E-05
0.0001465
2,8647E-06
N
16
82
54.6
5.24934E-05
0.00026044
2.6647E-06
N
24
13.8
68.4
7.87402E-05
0.00058599
2.8647E-06
N
32
10.3
78.7
1.04987E-04
0.00104176
2.8647E-06
N
4B
12.4
91.1
1.57480E-04
0.00234395
2,8647E-06
N
64
5.2
96.3
2.09974E-04
0.00416703
2.8647E.06
N
96
2.8
99.1
3.14961E-04
0.00937582
2.8647E-06
N
128
0.4
99.6
4.19948E-04
0.016636812
2.8647E.06
N
>128
0.5
100
-
2.8647E-06
N
Based on these
calculations,
particles less
than 2 microns will discharge
over the weir of Bain 3.
Calculate Total Suspended Solids Concentration
Assume naniefes 1.5 microns and smaller will discharge
Volume of
Subtotal of
Diameter size distribution
%<
Particle
Weighted
Weighted
% Total
(microns)
Itnicrons)
Volume
Volume
Volume
1 4.7
4.7
0.523
0.0246
0,0246
0.0001%
1.5 2.6
7.3
t.766
00459
0.0705
0.0002°%
2 4.6
12.t
4,187
02010
0,2715
0.001°%
3 5.6
17,7
14,130
0.79t3
1.0628
0.003°%
4 4.6
22.3
33,493
1.5407
2.6035
0.006%
6 7,6
29,9
113.040
8.5910
71.1945
0.028%
8 6
35, 9
267.947
160768
27.2713
0.068 %
12 10.5
46,4
004.320
94.9536
122.2249
0,304%
16 8.2
54,6
2143.573
175.7730
297.9979
0,741%
24 13.8
68,4
7234.560
998.3693
1296,3672
3,224°%
32 10.3
78.7
17148.587
1766.3044
3062,6716
7.616%
48 12,4
91.1
57876 480
7176.6835
10239.3551
25.461 %
64 5.2
96,3
137188.693
7133.8121
17373.1672
43.201%
96 2.8
99.1
463011.840
12964.3315
30337.4987
75.438 %
128 0.4
99.5
1097509.547
4390.0382
34727.5369
66.355%
128 0.5
100
1097509.547
5487.5477
40215,0446
100.000°%
40215.0846
Particles 1.5 microns and smaller make up 7.3 % of the total particles but 0.0002 % of the total volume.
Since the density of all the particles is assumed the same, then particles 1.5 microns
and smaller also
represent <0,001°% of the mass.
Estimated amount of cement washed
off each truck
0.5 IbfCY
Mass of cement washed off trucks
175
Ibfday
Mass of cement to discharge = Mass
of cement washed
off trucks each day x % of mass
=
0.03 pounds
=
13919.68089 mg
Total Suspended Solids of Discharge
(TSS) = Mass of cement (mg) ! Volume
of Storm
Runoff (Liters)
TSS =
13919.6B089
!
2859.87
Anticipaled TSS (mglC)'= 4.87 mglL
,Maximum TSS (ni = 30 mg1L
Approved Stormwater Permit Documents
Construction In accordance wKh 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;
�, r�, tn�va-C7TT
by_, -Afar=�0g2- _ Data
NC C�ivlaWn of Atbr utility
$heat p RlzWaicn Dib_____�

Calculate settleable solids discharge
Methodology for settabte solids measures the volume of settleable solids in an Imhoff cone after 60 minutes.
An Imhoff cone is approximately 14-inches fall. Results are reported in mUL. The following table calculates
the time for panicles to settle 1", 6" and 14'.
Olameter (microns)
Settling Velocity
(ttlsec)
t" Settling
Timc
[minutes)
6" Settling
Time (minutes)
14" Settling
Time (minutes)
1
1.01734E-06
1365.21
8191.28
19113.00
1.5
2.28902E-06
806.76
3640,57
8494.67
2
4.06931E-06
341,30
2047.92
4778.25
3
9.15607E-06
151,69
910.14
2123,67
4
1,62775E-05
85.33
511.96
1194,56
6
3.66243E-05
37.92
227.54
530.92
From calculations above, panicles 1.5 microns and smaller will lake longer than 60-minutes to settle only 6".
Anticipated Settleable Solids = 0 mUL
Maximum allowable Settleable Solids = 5 mllL
pH Analysis
A Fonrans pH control system (or equivalent) will be installed at the third sediment basin.
See attached Engineers Certification
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; certlly conformity with the
plans and specs;
Permit # NC 0102- Date �
by AM NC Division if ater uality
Sheet # Revision Date

65
0
Note:
Use nomograph Tc for natural basins with well-defined channels, for overland
flow on bare earth, and for mowed -grass roadside channels.
For overland flow, grassed surfaces, multiply Tc by 2.
For overland flow, concrete or asphalt surfaces, multiply Tc by 0.4.
For concrete channels, multiply Tc by 0.2.
Figure 8.03a Time of concentration of small drainage basins.
T-' T11n)
NO
116111
50
10
5
1
IC ' 2.3 40.4
V.1Z-
8.03.4
/( Z'3/07

OR
Hydrograph Plot
Hydraflow Hydrographs by lntelisolve
Hyd. No. 1
CRMP - Ahoskie
Hydrograph type
= Rational
Storm frequency
= 25 yrs
Drainage area
= 0.174 ac
Intensity
= 10.205 inlhr
OF Curve
= Scotland Neck, NC.IDF
Q (cfs)
2.00
1.00
Hyd No. 1
I
CRMP - Ahoskie
Hyd. No. 1 -- 25 Yr
Tuesday, Apr 24 2007, 4:44 PM
Peak discharge = 1.69 cfs
Time interval
= 1 min
Runoff coeff.
= 0.95
Tc by User
= 1.00 min
Asc/Rec limb fact
= 111
Hydrograph Voiume
0
Q (cfs)
2.00
1.00
--�- 0.00
5
Time (min)

Automatic pH Control Systems
Page 2 of 3
Home
pH Control System - Weatherproof Facility
Our Model 5000-S pH Control System
is a self-contained pH monitor and control system housed in a
weatherproof facility with lockable doors and adequate space to
house the instrumentation and circulation pump. The system is
configured for carbon dioxide gas operation.
i Ur $ o10
C
:�-3a
ag�y o
� CD
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IE
rO i} c
m mm lD
Cr 4 R
O to
0 N Z y W
3 m goo Cy
$ g41n
(A m
Sh
littp://Nvww.fortrans.biz/PHControl.htm
7/19/2005

ATC review for NCG14O102, Commercial Ready Mix Products, Ahoskie plant
1/15/08
kbp
Conclusion on above review date: Issue ATC letter
Review notes
1. Submittal parts
a. Design plan, design details, cut sheets, design calcs, by Mid -Atlantic Assoc.
submitted 5/18/07, and again with revisions 8/20/07.
b. Submittal sufficient.
2. Given lengthy delay on KBP's desk, if construction has begun or even 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. Outfails 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. Three -bay recycle system
iii. Truck rinse, drum wash go to immediately adjacent recycle system. Ok
iv. Silo wash down not addressed. Ok in this circumstance.
v. Spot check of design calcs confirms Stokes Law analysis and prediction
of effluent TSS of N5 mg/L, and apparent faithful execution of the
design basis in the plans.
4. Design basis review: Relocation of truck wash pad from existing location south of
Hayes Street to new location north of Hayes Street so that rinse water can enter the
recycle system. Ok
END

" State of North Carolina
Department of Environment
and Natural Resources
Division of Water Quality
James B. Hunt, Jr., Governor
Wayne McDevitt, Secretary
Kerr T. Stevens, Director
THOMAS CHARLES
COMMERICAL READY MIX PRODUCTS
P.O. BOX 190
COFIELD, NC 27922
Dear Permittee:
1•�
NCDENR
NORTH CAROLINA DEPARTMENT OF
ENVIRONMENT AND NATURAL RESOURCES
July 26, 1999
Subject: Reissue - NPDES Stormwater Permit
Commerical Ready Mix Products
COC Number NCG140102
Hertford County
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 Bill Mills of the Central Office Stormwater
and General Permits Unit at [phone], ext. 548
Sincerely,
for Kerr T. Stevens
cc: Central Files
Stormwater and General permits Unit Files
Washington 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

n
STATE OF NORTH CAROLINA
DEPARTMENT OF ENVIRONMENT AND NATURAL RESOURCES
DIVISION OF WATER QUALITY
GENERAL PERMIT NO. NCG140000
CERTIFICATE OF COVERAGE No. NCG140102
STORMWATER AND PROCESS WASTEWATER DISCHARGES
NATIONAL POLLUTANT DISCHARGE ELIMINATION SYSTEM
In compliance with the provision of North Carolina General Statute 143-215.1, other lawful standards and
regulations promulgated and adopted by the North Carolina Environmental Management Commission, and the
Federal Water Pollution Control Act, as amended,
COMMERICAL READY MIX PRODUCTS
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
COMMERICAL READY MIX PRODUCTS
100 HAYES ST
AHOSKIE
HERTFORD COUNTY
to receiving waters designated as Ahoskie MSSS & a UT of White Oak Swamp in the Chowan River Basin
in accordance with the effluent limitations, monitoring requirements, and other conditions set forth in Parts I, II, III,
IV, V, and V1 of General Permit No. NCO140000 as attached.
This certificate of coverage shall become effective August 1, 1999.
This Certificate of Coveraue 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
James B. Hunt, Jr., Governor
Jonathan B. Howes, Secretary
A. Preston Howard, Jr., P.E., Director
Mr. Thomas Charles
Commercial Ready Mix Products
P. O. Box 190
Cofield, NO 27922
Dear Mr. Thomas Charles:
March 31, 1995
Subject: General Permit No. NCG140000
Commercial Ready Mix Products
COC NCG 140102
Hertford County
In accordance with your application for a stormwater discharge permit received on November 28, 1994, we
are forwarding herewith the subject certificate of coverage to discharge under the subject state - NPDES general
permit. This permit is issued pursuant to the requirements of North Carolina General Statute 143-215 .1 and the
Memorandum of Agreement between North Carolina and the US Environmental Protection agency dated
December 6, 1983.
The stormwater permit you are receiving, NCG140000, does not permit wasting, concrete, dumping excess
concrete, directly into storm sewer outfalls or into waters of the state. Any facility which either dumps excess
concrete or washes excess concrete into storm sewers or waters of the state will be operating in direct violation to
both the terms of this permit and the North Carolina General Statutes. Such a discharge shall be considered an
illegal discharge and may subject the owner to enforcement actions in accordance with North Carolina General
Statutes 143-215.6A
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 reissuancc of the certificate of coverage. 1.
r
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 Mr. Bill Mills at telephone number 919/733-
5083, extension 548.
Sincerely,
Original Si,'st
Coieen H.
A. Preston Howard, Jr. P.E.
cc: Washington Regional Office
Mr. Roosevelt Childress, EPA
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 COVERAGE NO. NCG140102
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,
Commercial Ready Mix Products
is hereby authorized to discharge stormwater and rinse waters from a facility located at
Ahoskie Plant
100 Hayes Street
Ahoskie
Hertford County
to receiving waters designated as the Town of Ahoskie Storm Sewer System and an unnamed tributary to White Oak
Swamp in the Chowan River Basin
in accordance with the effluent limitations, monitoring requirements, and other conditions set forth in Parts I,11, III
and IV of General Permit No. NCG140000 as attached.
This Certificate of Coverage shall become effective March 31, 1995.
This Certificate of Coverage shall remain in effect for the duration of the General Permit.
Signed this day March 31, 1995.
Original Signed By
Ween H. Sullins
A. Preston Howard, Jr., P.E., Director
Division of Environmental Management
By Authority of the Environmental Management Commission

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