NCG140418_COMPLETE FILE - HISTORICAL_20170504

STORMWATER DIVISION CODING SHEET
NCG PERMITS
PERMIT NO.
/v G� 1
DOC TYPE
N HISTORICAL FILE
❑ MONITORING REPORTS
DOC DATE
r,
YYYYM M D D

Division of Energy, Mineral, and Land Resources
Land Quality Section / Stormwater Program
National Pollutant Discharge Elimination System (NPDES)
Energy, Mineral & PERMIT OWNER AFFILIATION DESIGNATION FORM
[and Resources ENVIRONMENTAL OUFL3IY (Individual Legally Responsible for Permit)
Use this form if there has been:
FOR AGENCY USE ONLY
Date Rcccivcd
Year
Mo�¢hI
Da
NO CHANGE in facility ownership or facility name, but the individual
who is legally responsible for the permit has changed.
If the name of the facility has changed, or if the ownership of the facility has changed,
do NOT use this form. Instead, you must flit out a Name -Ownership Change Form
and submit the completed form with all required documentation.
What does "legally responsible individual' mean"
The person is either.
• the responsible corporate officer (for a corporation);
• the principle executive officer or ranking elected official (for a municipality, state, federal or other public
agency);
• the general partner or proprietor (for a partnership or sole proprietorship);
• or, the duly authorized representative of one of the above.
1) Enter the permit number for which this change in Legally Responsible Individual ("Owner Affiliation")
applies:
Individual Permit (or) Certificate of Coverage
N C S, N C G
2) Facility Information:
Facility name:
Company/Owner Organization:
Facility address:
/`--o k kOalc CLvt-
N
Ed-7 old h
ss
�►��Gj�c a� a>i � 07s�s
City State Zip
To find the current legally responsible person associated with your permit, go to this website:
and run the Permit Contact Summary Report
3) OLD OWNER AFFILIATION that should be removed:
Previous legally responsible individual: -it) Vy" ` Adj,,K4 Jr -
First MI Last
4) NEW OWNER AFFILIATION (legally responsible for the permit):
Person legally responsible for this permit: V!�
First M1 Last
Page 1 of 2
S WU-OWNERAFF1G23March2017

NPDES Stormwater Permit OWNER AFFILATION DESIGNATION Form
(if no Facility Name/Ownership Change)
1000'rwmm.
lZitle�/l/ v
n r Mailing Address I 1z � Q5
zip
State �6VAVII �fcokcr e,(�
Telephone E-mail Address
Fax Number
5) Reason for this change:
A result of: 0 Employee or management change
❑ Inappropriate or incorrect designation before
❑ Other
If other please explain:
The certification below must be completed and signed by the permit holder.
PERMITTEE CERTIFICATION:
I, � U f h , attest that this application for this change in Owner Affiliation
(person legally responsible for the permit) has been reviewed and is accurate and complete to the best of my
knowledge. I understand that if all required parts of this form are not completed, this change may not be
processed.
Ll -tl
Signs Date
PLEASE SEND THE COMPLETED FORM TO:
Division of Energy, Mineral, and Land Resources
Stormwater Program
1612 Mail Service Center
Raleigh, North Carolina 27699-1612
For more information or staff contacts, please call [phone] or visit the website at:
hM:Hdeg.nc. goy/about/divisions/energy-mineral-land-resouTcesistormwater
Page 2of2
S WU-OWNERAFFU-23Nbr2o 17

At� &C*■.
Y CDE L
North Caroling Department & Environment and
Division of Water Quality
Beverly Eaves Perdue Coleen H. Sullins
Governor Director
October 31, 2011
Mr, John Holding
Thomas Concrete of Carolina, Inc.
P.O. Box 12544
Raleigh, NC 27605
Natural Resoltree
Subject: General Permit No. NCG140000
Knightdale Batch Plant
COC No. NCG140418
Wake County
Dear Mr. Holding:
Dee Freeman
Secretary
In accordance with your application for a discharge permit received on October 14, 2011,
we are forwarding herewith the subject certificate of coverage (COC) to discharge under the
subject state — NPDES general permit. This permit is issued pursuant to the requirements of
North Carolina General Statute I43-215. l and the Memorandum of Agreement between North
Carolina and the US Environmental Protection Agency dated October 15, 2007 (or as
subsequently amended).
Please note that NCG140000 contains effluent limitations for process wastewater
discharges (see Part IV, Section D). At present, those limits are 6-9 S.U. for pH (when
discharging to freshwaters), 6.8-8.5 S.U. for pH (when discharging to saltwaters), 30 mg/l for
TSS, 20 mg/I for TSS (when discharging to HQW waters), 10 mgll for TSS (when discharging to
Trout and PNA waters), 5 mL/L for Settleable Solids, and 50% of the Summer 7Q10 Flow for
discharges to HQW waters. Wastewater discharges must meet the requirements of these
effluent limitations. An exceedence of any of these limitations will result in a violation of the
permit conditions.
Please note that groundwater standards in 15A NCAC 02L and 02T regulations must also
be met for any recycle systems or discharges to groundwater.
Please take notice that this certificate of coverage is not transferable except after notice to
the Division of Water Quality. The Division of Water Quality may require modification or
revocation and reissuance of the certificate -of coverage. This permit does not affect the legal
requirements to obtain other permits which may be required by the Division of Water Quality or
permits required by the Division of Land Resources, Coastal Area Management Act or any other
federal or local governmental permit that may be required.
Wetlands and Storn xater Branch One
1617 Mail Service t.-3nter, Raleigh, North Caroli-,a 2699 1617 NorthCaroli na
L -Aiw 512 N. SeVsbnr� S' Raleigh, North CF:.-olina 2; 94 n
P--ne: 91"07 Q' J 1 :AX: C I9-807-6494 1. C. ^tu: w c, wice: 1-877-62.' ,713
Irr- :;net: www.nrvater,,uality.. rq 6%
Arquat Oppodowly .i5 native-;1iion Employ-r

Mr. John 11, dding
Thomas "I'micrete of Carolina. Inc.
NC(' 1404 d
October 31. 2011
Per the requirements of the Neuse Riparian Buffer Rule, all stormwater drainage to
stream buffers, from portions of this site that have been constructed after July 22, 1997, must be
discharged through a correctly designed level spreader or another device that meets diffuse flow
requirements per 15A NCAC 2B .0233. Diffuse flow requirements are described in Chapter 8 of
the North Carolina Stormwater BMP Manual, available at:
http://portal.ncdenr.org/web/wq/ws/suibmp-manual.
If you have any questions concerning this permit, please contact Robert Patterson at
[phone], or [e-mail].
cc: Raleigh Regional Office
Central Files
Stormwater Permitting Unit Files
enclosure
Sincerely,
ORIGINAL SIGNED �)
KEN PICKLE
for Coleen H. Sullins
Page 2 of 2

STATE OF NORTH CAROLINA
DEPARTMENT OF ENVIRONMENT AND NATURAL RESOURCES
DIVISION OF WATER QUALITY
GENERAL PERMIT NO. NCG140000
CERTIFICATE OF COVERAGE No. NCG140418
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,
Thomas Concrete of Carolina, Inc.
is hereby authorized to discharge stormwater and process wastewater from a facility located at
Knightdale Batch Plant
507 Old Montague Lane
Knightdale
Wake County
to receiving waters designated as Milburnie Creek & UT to Beaverdam Creek, both class C;
NSW water in the Neuse River Basin, in accordance with the effluent limitations, monitoring
requirements, and other conditions set forth in Parts 1, II, III, IV, V, and VI of General Permit
No. NCG 140000 as attached.
This certificate of coverage shall become effective October 31, 2011.
This Certificate of Coverage shall remain in effect for the duration of the General Permit.
Signed this the 3 1 " day of October, 2011.
ORIGINAL SIGNED M
KEN PICKLE
for Coleen H. Sullins., Director
Division of Water Quality
By the Authority of the Environmental Management Commission

NCG140418
Map Sr alp 1: 24, 000
'Thomas Concrete of Carolina, Inc.
Knightdale Batch Plant
Latitude: 350 47' ST N
Longitude: 780 30' 06" W
Count Wake
Receiv,ng Scream: Miibu; nie :ri,. & LIT to Bea%erdam
Stream Class: C; NSW
-,ub-basin: 0',-0-.-02 (Neus{ River Basin)
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Division of Water Quality / Surface Water Protection
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National Pollutant Discharge Elimination System application for coverage under General Permit
NCG140000:
STORMWATER AND PROCESS WASTEWATER DISCHARGES associated with activities classified as:
SIC (Standard Industrial Classification) Code - 3273 Ready Mixed Concrete
For new plant sites that will discharge or recycle process wastewater (even if commingled with
stormwater): This NOI is also an APPLICATION FOR Authorization to Construct (ATC) wastewater
treatment facilities. ATC requests must be submitted at least 90 days prior to construction'.
For existin plant sites discharging or recycling process wastewater (even if commingled with
stormwater): This NOI is also an APPLICATION FOR Authorization to continue to operate wastewater
treatment facilities in place. Construction, modification, or installation of any new treatment components
at an existing site requires an ATC.
Treatment facilities used to treat or recycle process wastewater (including stormwater BMP structures
treating process wastewater flows commingled with stormwater) require an ATC prior to construction
per 15A NCAC 2H .0138. The authorization to constructor continue to operate will be issued at the
same time as the Certificate of Coverage (COC) for the NCG 14 permit. Design of treatment facilities
must comply with requirements of 15A NCAC 2H .0138 & .0139.
Construction of wastewater treatment facilities (this includes recycle systems) at new or existing plant
sites requires submission of three (3) sets of plans and specifications signed and sealed by a
Professional Engineer (P.E.) or qualified staff2 along with this application. A copy of the design
,calculations should be included.'Please sed;guesti6ris-14 & 15.
T.
r For questions, please contact the D WQ Regional Office for your area. (See page 5)
(Please print or type)
1) Mailing address of owner/operator (address to which all permit correspondence will be mailed):
Name Thomas Concrete of Carolina, Inc.
Street Address Post Office Box 12544
City Raleigh StateNC ZIP Code 27605
Telephone No. 919 832-0451 Fax: [phone]
:2) Location of facility producing discharge:
Facility Name
Facility Contact
Street Address
City
County
TelePhone No.
Thomas Concrete of Carolina, Inc. Knightdale Batch Plant U Ig(C_� 1-4 U V
Daniel Rusnak uu t=!
507 Old Montague Lang
Knightdale StateNC ZIP Code 27545
Wake n�� `v
919 217-2946
Fax:
Par3e 1 of 5
'AS per 15A NCAC 21-1.01%
2ULiless treatment {acilitier are designed, cc nstrur ed, and put into operat: +n by employees intern. i to the company who a•e quatified to
pe,iorm such worhJor the; respective companies n a.:cordance with General Statues, 89C-25 (7', plans and specifications must be signed
and sealer by a P.E.
BRANCH
S' A'-229-`171408 ' as: revi a3 7114/08

NCG140000 N.O.I
3) Physical location Information:
Please provide a narrative description of how to get to the facility (use street names, state road numbers, and
s
distance and direction from a roadway intersection). Located approximately 1 mile north of the
intersection of Old Montague Lane and.Knightdale Boulevard (US 64), approximately one mile east of
the intersection on Knightdale Boulevard and Hinton Oaks Boulevard and 1.5 miles east of the
Northern Wake Expressway (Interstate 540)
(A copy of a.county map or USGS quad sheet with facility.clearly located on the map is a required part of this application.)
4) Latitude 35° 47' 57 a Longitude 78' 30' 06 « (deg; min, sec)
5) This NPDES. Permit Application applies to which of the following:
❑ New or Proposed Facility Date operation is to begin
X Existing
6) Standard Industrial Classification:
Provide the 4 digit Standard Industrial Classification Code (SIC Code) that describes the primary industrial
activity at this facility
SIC Code: 3 2 7 3
7) Provide a brief description of the types of industrial activities and products produced at this facility:
(Include a site diagram showing the process areas present at this facility.)
Concrete batch plant, produces construction -grade concrete using cement, aggregate, chemical admixtures
and water in batches that are loaded onto trucks for off -site use.
8) Discharge points 1 Receiving waters:
How many discharge. points (ditches, pipes, channels, etc.) convey stormwater and/or wastewater from the
property? One (1)_ _;!Y _�L C3ii'�y�ri ' � S 1�1/a L. 4AA r �1/rt,�-1c.9'=rr ✓ram_ ��
What is the name of the body or bodies of water (creek, stream, river, lake, etc.) that the facility stormwater
and/or wastewater discharges end up in? Unnamed tributaries to Milburnie Lake, Neuseco Lake,and
beaverdam Creek
If the site stormwater discharges to a separate storm sewer system, name the operator ofi.the separate storm
sewer system (e.g. City of Raleigh municipal storm sewer).
Receiving water classification (if known)C, NSW
Note: Discharge o. process wastewater to receiving waters classified as WS-fL to IWS-V or SA must
be approve&by the N.C. Dept: of Environmental Health.-If,DEH,does not approve; coverage
under NCG140000 cannot 5e.gFanted. ,No new discharges of process wastewater are
permitted in receiyiriy waters classified as WS-I or freshwater ORW:
9) '•Does this facility. have any other NPDES-permits?
X No
❑ Yes
If yes, list.the permit numbers for all current NPDES permits for this facility:
10)•Does this facility have any. Nari-Discharde,pefmits (ex: recycle permits)?
X No
❑ Yes
If yes, list the permit numbers for all current, Non -Discharge permits'for-this facility:
11) Does this facility employ any' best management practices for stormWater control?
❑ No
X �'es
f -�gel2 of 5
5W0-2::„-0.140P- Last reviFA -1141, -AB

NCG140000 N.O.I.
If yes, please briefly describe: Wastewater collection pits in center of property that collect rinse water from
truck cleaning operations and stormwater runoff, provide physical (separation) and chemical (pH adjustment)
treatment, and recycle the water back to the truck wash station. Additionally, a storm water retention
basin/wetlands are located on the northwestern corner of the property collects runoff from the northern and
southern areas of the site and provides treatment for solids prior to discharge off -site.
12) Does this facility have a Stormwater Pollution Prevention Plan?
❑ No
X Yes
If yes, when was it implemented?April 2009
13) Are vehicle maintenance activities occurring or planned at this facility?
X No
❑ Yes
Wastewater Treatment Design Information
14) Are discharges occurring or planned from any of the following process wastewater generating activities?
Vehicle and equipment cleaning X Yes ❑ No
Wetting of raw material stockpiles ❑ Yes X No
Mixing drum cleaning ❑ Yes X No n/u 1 J3c4 T r S
fo/Ile-
If yes to any of the above, please describe the type of process used to treat and/or recycle the process p e(SIG W_
wastewater. -B is _ ree
For a sufficient application, you must provide design specifics (e.g., design volume, retention time, surface �/
area, etc.) and calculations to demonstrate compliance with permit effluent limits (pH — 6-9 SU, Total
Suspended Solids (TSS) — 30 mg/l, and Settleable Solids (SS) — 5 mill.) [Use separate sheet(s)].
If all these discharges are recycled, please refer to Question 15.
For plants that recycle and/or discharge Brocess wastewater.
When applying for this permit, you are also applying for an authorization to construct (new
treatment facilities_ ) or authorization to continue to operate (existing treatment facilities) as
part of the NOI. For new sites, you must submit three (3) sets of design plans and
specifications with this application and provide supporting calculations that predict
compliance of final discharge with.permit limits. For existing -sites, applicants should submit
three (3) sets of plans and specs for facilities as -built and,provide as many design details as
possible, or submit a detailed diagram of treatment systems in place that includes information
such as tank volumes, dimensions, retention time, piping, settling basin details, etc.
Please.note If new, treatment systems are planned for an existing site, an A TC will be required
prior to construction of those facilities. Plans/specslcalculations prepared by'a P.E. and the
request for an ATC may be submitted with this NOI, or separately at a later date. DWQ may
re4uest the: status of your plans for requesting an ATC upon_issuance of the COC.
15) Does the facility use or plan to use a recycle system?
❑ No
X Yes
If yes, what size storm event is the system designed to hold before overflowing? (for example, 10-yr, 24-hr)
25 year, 24-hr rainfall event
For a recycle system (regardless of when it overflows), please provide plans, calculations, and design
specifics (e.g., throughpt t assumptionslwat(-r balance, design v-)lume, retention tin-e, surface area, an-ountof
freeboard i,i dresign stoat; eve! it, etc.). [Use separate sheet(s)).
SV? t-229-0714G? Las! ,evised 711412Jti

NCG140000 N.O.I.
For a sufficient application, the information must demonstrate compliance of final discharge with permit
1Peffluent limits (pH — 6-9 SU, Total Suspended Solids (TSS) — 30 mg/l, and Settleable Solids (SS) — 5 ml/l), or
must demonstrate that the recycle system has sufficient capacity to contain runoff from a 25-year, 24-hr
rainfall event plus one foot of freeboard under design operating conditions,
16) Are wastewater treatment facilities (including recycle systems) planned in the 100-year flood plain?
X No ❑ Yes If so, include information to demonstrate protection from flooding. (Minimum design
requirements for treatment works include protection from the 100-year flood, per 15A NCAC 2H .0219.)
17) Hazardous Waste:
a) Is this facility a Hazardous Waste Treatment, Storage, or Disposal Facility?
X No
❑ Yes
b) Is this facility a Small Quantity Generator (less than 1000 kg. of hazardous waste generated per month) of
hazardous waste?
X No
❑ Yes
c) Is this facility a Large Quantity Generator (1000 kg. or more of hazardous waste generated per month) of
hazardous waste?
X No
❑ Yes
d) If you answered yes to questions b. or c., please provide the following information:
Type(s) of waste:
How is material stored:
Where -is material stored:
How many disposal shipments per year:
Name of transport I disposal vendor:. —
Vendor address:
18) Certification:
North Carolina General Statute 143-215.6 B(i),provides that:
Any person who knowingly makes any false statement, representation, or certification in any application, record, report, plan, or other
document flied or required to be maintained under this Article or a rule implementing this Article; or who knowingly makes a false
statement of a material fact in a rulemaking proceeding or contested case under this Article; or who falsifies, tampers with, or knowingly
renders inaccurate any recording or monitoring device or method required to be operated or maintained under this Article or rules of the
[Environmental Management] Commission implementing this Article shall be guilty of a Class 2 misdemeanor which may include a fine
not to exceed ten thousand doliars,($10.000).
I hereby request coverage under the referenced General Permit. I understand that coverage under this permit
will constitute the permit requirements for the discharge(s) and is enforceable in the same manner as an
individual permit.
I certify that I am familiar with the information contained in this application and that to the best of my
knowledge and belief such information is true, complete, and accurate.
-inted Name of Person Sign' ng: _John Holding
ecutiv Vic Presid * t
in n tiro of A)6 11cen) ateT t rgnec i
Pacc� 4 of
'3WU--29-071408 Last rc,rised 7114I200,

NCG140000 N.O.I.
Notice of Intent must be accompanied by a check or money order for $100.00 made payable to:
NCDENR
Final Checklist
This application will be returned as incomplete unless all of the following items have been included.
X Check for $100 made payable to NCDENR.
X This completed application and all supporting documentation (including design details and calculations for
treatment systems).
7J If an Erosion & Sedimentation Control (E&SC) Plan is required from Division of Land Resources (DLR)
Ili or local designee: documentation verifying applicant has developed and submitted that Plan to the governing
agency (required per 15A NCAC 02H .0138).
❑ For new sites (or sites that will install new treatment facilities): Three (3) copies of plans and
specifications for wastewater treatment facilities (including recycle systems), signed and sealed by a
Professional Engineer or qualified staff meeting requirements of G.S, 89C-25 (7).
X For existing sites: three (3) copies of plans and specifications for wastewater treatment facilities (including
recycle systems) as built, stamped and sealed by a Professional Engineer, or (only if plans not available) a
detailed diagram of treatment systems in place that includes information such as tank volumes, dimensions,
retention time, piping, settling basin details, etc.
X A site map showing, at a minimum, (existing or proposed):
(a) outline of drainage areas, (b) stormwaterlwastewater treatment structures, (c) location of
stormwaterlwastewater outfalls (corresponding to which drainage areas), (d) runoff conveyance structures,
(e) areas where materials are stored, (f) impervious areas, and (g) site property lines.
X A county map or USGS quad sheet with location of facility clearly marked.
Mail the entire package to:
Stormwater Permitting Unit
Division of Water Quality
1617 Mail Service Center
Raleigh, North Carolina 27699-1617
Note
The submission of this document does not guarantee the issuance of an NPDES permit.
For questions, please contact the DWQ Regional Office for your area.
DWQ Regional'Office Contact Information:
Asheville Office ......
[phone]
Fayetteville Office
... [phone]-
Mooresville Office
... (7,4) 663-1699
Raleigh Office ........ [phone]•-
Washington Office
...[phone]
Wilmington Office...
[phone]
Winston-Salem ......
[phone]
Central Office .........
[phone]
Par eriof ;
SWi -229 071aC8 :_as1 t.Msed 711412.0L­-i

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DUNCKI-FE & DUNHAM, P'C' ifjif?iustiiidtc Cure:
FNVIRONNIENTAL CONSULTANI S
51 I.KEISLER DR] VE -SUITE 102
• CARY, 'JOR'IH CAROLINA 27518
7.5-Minule Quadrangle. jVartis Ton w ds To o Paj
Site Location on USGS Topographic Map
Thomas Concrete of Carolina, Inc.
Kniahtdale, North Carolina

Storm Water Pollution Prevention Plan
Thomas Concrete-Knightdale Batch Plant
Knightdale, North Carolina
April 14, 2009
Page 4 of 19
are used for the storage of raw materials (cement, flyash, and chemical additives), cleaning chemicals,
and diesel fuel. The three silos are approximately nine feet in diameter, 20 feet in height, installed on a
concrete pad, and contain raw material (cement and flyash) for the concrete batch process. The chemical
additive ASTs range from 500 to 2,000 gallons in capacity, and store specialty chemical additives for the
batch process (see Table of AST inventory below). The diesel fuel AST is twenty feet long, nine feet in
diameter, and stores diesel fuel fro concrete tanker trucks. Chemical cleaners for the concrete trucks are
stored in 55 gallon drums and 300 gallon totes.
All of the chemical additives ASTs are stored within a concrete block wall containment basin on the west
side of the office building. The diesel fuel AST is a double -walled tank installed on a concrete pad on the
southeast side of the property. Transfer of petroleum and chemical products occurs to and from tanker
trucks parked in secured areas adjacent to the ASTs.
?:3 Site Mup
Figure 2 is a site map of the Thomas Concrete Knightdale facility. Labeled on this drawing are material
storage and transfer areas, bulk petroleum and chemical storage areas, wastewater holding and treatment
areas, drainage structures, drainage areas, locations of buildings, parking lots and other impervious areas.
Storm water drainage from the impervious (paved or occupied by building structures) areas of property is
routed by gravity via overland flow toward the center of the property into a collection and treatment
system consisting of five concrete settlement pits and a wastewater collection, treatment, and recycle pit.
Water collected within the treatmentlrecycle pit is treated to adjust the pFl, and pumped back to the
vehicle cleaning areas for re -use. Overflow from the settlement and recycle pits, as well as overland flow
from pervious drainage,areas on the north and south sides of the property flows into vegetated diversion
ditches located along the northern and southern property lines. The diversion ditch along the southern
property line directs flow into a detention basin/wetland area on the southwestern corner of the property
that discharges down a riprap-lined slope into a woodland area (Figure 2). Drainage from the north side
of the property, which includes building roofs_, as well as aggregate storage areas, vehicle access and
travel areas, and the chemical storage area is routed via surface. -grade into a vegetated diversion ditch
located along the northern property line. The ditch directs flo- into a retention basin located on the
northwestern comer of the_property that discharges over a weir, down a riprap-lined slope "and into a
wooded area. The receptors of storm water runoff from the facility are tributaries to Milburnie Lake,
Neuseoco Lake and Beaverdam Creek, located west and north of the site, respectively (Figure 1).
Figure 2 shows the drainage patterns and runoff destinations at the site. The total area and percent
impervious area for each drainage area are:
DRAINAGE AREA
TOTAL AREA
• w,
IMPERVIOUS, AREA
-._ - w 7"
IMPERVIOUS
is'
ACRES i',._
(ACRES),
PERCENTAGE;
DA-1
2.39
0.53
:22"XI:
I}A-2
'2 I
0.40
DUNCKLCE & OUNHAN', P.C.

Storm Water Pollution Prevention Plan
Thomas Concrete-Knightdale Batch Plant
Knightdale, North Carolina
April 14, 2009
Page 9of19
Impervious surfaces and storm drainage systems (culverts, etc.) reduce the time needed for runoff to
travel to the facility's outfall and increase runoff volume. Soils and other particulates are pollutants that
are most affected by runoff rate. Higher runoff rates increase erosion potential and transport particulate
matter into receiving waters. Traditional storm water management efforts aim to lessen this impact in
order to control flooding and minimize the size of downstream storm water conveyance systems. A
corollary benefit of these efforts is a reduction in pollutant loading. Examples of methods that can be
used to reduce runoff rates and flow velocities include: reducing runoff volume, leveling slopes of runoff -
producing surfaces, and installing check dams and other runoff detention structures in the receiving
stream. Other erosion control practices include vegetative linings in drainage paths, temporary soil
matting, riprap, level spreaders, and placement of gabions (wire baskets filled with rock), which are
designed to dissipate energy, reduce flow velocities and provide structural protection. Concrete -lined
channels may also be used, but they may cause increased runoff velocity.
Pollutants in storm water runoff, especially suspended materials, can be reduced by use of retention and
detention basins, bioretention areas, engineered wetlands, sand filtration systems and sediment traps.
Oil/water separators are effective for removal of oil and grease and other low -solubility, lighter -than -
water pollutants. Adequate space allocation and regular maintenance are important for the construction
and long-term effectiveness of these storm water management structures. Elements of SSWMPs
including grassed sheet flow areas, grass -lined channels and riprap outlet protection are evident in the
existing storm water system, and have been incorporated into the Plan.
3.2.5 Eliminating Pollutant Sources
Often the most reliable and least expensive option that can be used to reduce pollutants in storm water
runoff is to eliminate potential exposure of storm water to pollutants. Where this is feasible, it should be
the first option considered. Common methods include:
+ Moving industrial activities and materials indoors or under roof eliminating illicit discharges;
• Diverting runoff from areas containing pollutants; implementing good housekeeping practices; and
changing operational practices.
Most of these methods have been incorporated into the operation of the facility and development of the
Plan.
3.3 Existing S'tarm Water Management Practices
Exposure of industrial activity to storm water can be controlled through the use of storm water
management practices. Both structural and non-structural management practices are employed at the
Thomas Concrete Knightdale Batch plant. As indicated in the previous section, many storm water
management practices have already been implemented at the facility. Storm water management practices
currently used at the facility are discussed in the following sections.
D'JNCKLFE. &. DUNI]AM, P.C.

Storm Water Pollution Prevention Plan
Thomas Concrete-Knightdale Batch Plant
Knightdale, North Carolina
April 14, 2009
Page 10 of 19
All new plant employees who deal with hazardous materials and waste receive Hazardous Waste
Management Training annually, and employees responsible for cleaning up hazardous waste spills are
provided Hazardous Waste Operations ("HAZWOPEk") training, and are provided annual HAZWOPER
refresher training in accordance with 29 CFR 120. For each of the following sections, these procedures, in
addition to the storm water management practices in place, will provide additional measures to prevent
spills from impacting surface waters.
3.3.1 Office and Maintenance Building
Storage of petroleum products other than diesel fuel is conducted within 55-gallon drums with over -pack
containers inside of the storage shed_ Excluding the storage of construction debris and operational
equipment outside of the storage shed on the northwest side of the site, all storage of petroleum products
and maintenance tools and equipment is conducted inside the storage shed or within secondary
containment structures. There are no floor drains in the storage shed.
Non -industrial (domestic) wastewater from the office flows to the Town of Knightdale sanitary sewer
system.
3.3.2 Cement Truck Cleanout Areas
The following storm water management practices currently exist at the cement truck cleanout areas:
Secondary containment for the collection of wastewater from the washing processes is provided
by five settling pits in parallel that are constructed of a concrete pad and concrete baffle walls.
The settling pits are each 12 feet in width, 28 feet in length, and eight feet deep, with side slopes
of 20.5 feet, and have approximately 1,680 square feet of surface area. The five settlement pits
provide approximately 13,440 cubic feet (100,531 gallons) of secondary containment for collection
of storm water runoff from the impervious drainage areas surrounding the system as well as
wastewater from the vehicle cleaning processes. Wastewater from the cleanout processes that
accumulates inside the containment area is treated in an additional pit with buffering agents to
adjust the pH and returned to the process via a sump pump and three-inch flexible and rigid
piping. The collection/treatment pit measures 40 feet,by 40 feet by 12.33 feet deep, and has a
capacity of approximately 17,600 cubic feet (131,648 gallons) with one foot of freeboard
provided. Overflow from the settlement and recycle pits flows across the paved areas to the
southwest and northwest, into vegetated diversion ditches located along the southern and northern
property lines. The southern diversion ditch directs flow into a wetland area on the southwestern
corner of the property, and the northern diversion.ditch directs flow into a retention basin located
on the northwestern corner of the property. Overflow from the wetland area and detention basin
flows into a woodland area and eventually into tributaries to Milburnie Lake; Neuseoco Lake and
Beaverdam Creek, located west and north of the site, respectively. The settlementhreadnent pit -
detention basin system is sized to collect and contain the volume of storm water from a portion of
drainage areas DA-I and i7A-2 associated with a 25-year storm event and release the runoff ata
flow rate equal to or less than pre -development peak conditions for a 25-year storm event.
DUNCKLEE P DUNI'AM, P.C'.

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Patterson, Robert
From: Garrett, Judy
Sent: Wednesday, October 26, 2011 4:48 PM
To: Patterson, Robert
Cc: Smith, Danny
Subject: RE: NCG140418 - Thomas Concrete - Knightdale Batch Plant
No concerns. Go ahead and issue the COC.
Thanks,
Judy Garre
From: Patterson, Robert
Sent: Wednesday, October 26, 2011 11:29 AM
To: Garrett, Judy
Cc: Smith, Danny
Subject: NCG140418 - Thomas Concrete - Knightdale Batch Plant
Judy/Danny,
Please see N01 attached.
We have received an application for coverage of an existing ready -mixed concrete facility under NCG 14 from Thomas
Concrete of Carolinas, Inc.. The facility drains to Milburnie Creek and an UT to Beaverdam Creek (class C; NSW) in
Knightdale (Wake County). No vehicle maintenance or haz. waste. Does the RRO have any concerns about issuing this
facility a COC for this general permit?
Thanks.
Robert D. Patterson, PE
Environmental Engineer
NCDF,NR I DWQ I Stormwater Permitting
1617 Mail Service Center, Raleigh, NC 27699-1617 Mail 1 512 N. Salisbury St, Raleigh, NC 27604 1 92h Floor Location 8; Parcels
[phone] Phone [phone] Fax I Robert. Pattersonra,ncdenr.gov L:mail I http:/ portal.ncdennorg/web/wg/ws/su Website
r.A before printing this email. please consider your budget and the environment
E-mail correspondence to and from this address may be subject to the North Carolina Public Records Law and may be disclosed to third parties unless the content is
exempt by statute or other regulation.
Robert D. Patterson, PE
Environmental Engineer
NCDENR I DWQ I Stormwater Permitting
1617 Mail Sen ice Center, Raleigh, NC 27699-1617 Mail 1 512 N. Salisbury St, Raleigh, NC 27604 1 91'1 Floor Location &. Parcels
[phone] Phone [phone] Fax I Robert. Pattersonancdenr.gov Email I http://nortal.nedenr.org/web/wg/ws/su Website
rA Before printin; this email. please consider your hudget and the environmcnl.
E-mail correspondence to and from this address may be subject to the North Carolina Public Records Law and may be disclosed to third parties unless the content is
exempt by statute or other regulation.
1