NCG140218_MONITORING INFO_20190204

STORMWATER DIVISION CODING SHEET
NCG PERMITS
PERMIT NO. Iv lq�J
DOC TYPE ❑HISTORICAL FILE
C� MONITORING REPORTS
DOC DATE ❑ � �� -/ � d�
WYYMMDD

ANNUAL SUMMARY DISCHARGE MONITORING
REPORT (DMR) —WASTEWATER
SUBMIT TO CENTRAL OFFICE*
General Permit No. NCG140000
Calendar Year 2018
*Report ALL WASTEWATER monitoring data on this form (include "No Flow"P'No Discharge" and -Limit Violations) from
the previous calendar year to the DEQ by MARCH .1 h ear.
Certificate of Coverage No. NCG14 0❑ z❑0®
Facility Name: Thomas Concrete - Durham Plant
County: Durham
Phone Number: (919
Certified Laboratory ESC
460-5317
FE$ 0 4 Zo19
CENTRAL FILES.
UAN �, r' n
Total no. o� OtaEtfa�PAbnitored 1
Lab # ENV 375
Lab #
Wastewater (WW) Discharge Outfall No. 001
Does this outfall discharge WW to SA waters? Yes ❑ No ❑✓
Does this outfall discharge WW to SB or PNA waters? Yes ❑ No �✓
Does this outfall discharge WW to HQW or ORW waters? Yes ❑ No {[-]
If so, what is the 7Q10 flow rate? or Tidally influenced waters, 7Q10 not available ❑
Does this outfall discharge WW to Trout (Tr) designated waters? Yes ❑ No 0
Were there any limit violations in the calendar year? Yes ✓l No ❑
Outfall No.
001
Daily Flow Rate,
cfs
pH,
SU
TSS,
mgll
•
SS.,
mill
if applicable
Non -Polar O&G (EPA Method 1664
(SGT-HEM)), mgll
Effluent '
Limitations
Daily Maximum
HOW orORW
0
50% of 7Q10
Indlca[a NO FLOW if
applicable
freshwater
6.0-9.0
saltwater
p-
V 8
. .
. Standard
34
HOW
20
HOW l ORPWao• Tr, or
A
10Date
Haw, Dgw, SA,
S9,PNA,orany
Trout
5
No Limit
Samples above Benchmark
subject to Tiered Responses
15
Sample
Collected,
moldd/yr-r
�.. .� Ail`::
117: J�At
'.
�z��5__�,`-
Y
s_'
w.�
_� ':ter �.
2/26118
11,28
55.70
NIA.
<1.16
6/30118
NO DISCHARGE Q2
7130118
12,14
144
NIA
Not Sampled
10/11/18
13.11
98.8
NIA
Not Sampled
Permit Date 811/2017 — 6/30/2022
Last Revised 8-22-2017

Certificate of Coverage No. NCG14 FoJ ]Q®
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 violations."
[Required by 40 CFR §122.22] .
Signature XL
Date= `
Mail Annual Summary Wastewater DMR to the NCDEQ Central Office:
Note the address is correct - Central Files is housed in DWR (not DEM,R)
N.C. Department of Environmental Quality (DEQ)
Division of Water Resources
Attn: DWR Central Files
1617 Mail Service Center
Raleigh, NC 27699-1617
Central Files Telephone [phone]
Questions? Contact DEMLR Stormwater Permitting Staff in the Central Office at:
[phone]
Permit Date 8/1/2017 -- 6/30/2022
Last Revised 8-22-2017

.1
Water Resources
Environmental Quality
RECEIVE®
APR 17 2018
CENTRAL FILES
DWR SECTION April 6, 2018
CERTIFIED MAIL 0 7017 2680 0000 2219 3738
RETURN RECEIPT REQUESTED
Brian Westfall, Plant Manager
Thomas Concrete of Carolina, Inc.
2722 Angier Avenue
Durham, NC 27703
Dear Mr. Westfall:
ROY COOPER
Governor
MICHAEL S. REGAN
Secretart,
LINDA CULPEPPER
Interim Director
pl1 -eNe0IDE%TIDW� ppR 1.310b
Water lesser ton
Ivcc'-fy aa-i �
Subject: Notice of Violation -Notice of Intent to Enforce
NOV-2018-SS-0010
Stream Standard Violations
Durham County
On January 11, 2018, Charlotte Dawn 'kyith the City of Durham Stormwater and GIS Services Division reported
concerns of a discharge of wastewater from a storniwater detention pond at Thomas Concrete resulting in pH
values between`9-and l 1 in nearby streams.
Jeremiah Dow and Thomas McKinney from the Raleigh Regional Office (RRO) of the Division of Water
Resources (DWR) assisted by Charlotte Dawn with the City of Durham conducted an inspection at the above
referenced site. The investigated areas were three (3) storm,,eater outfalls and unnamed tributaries to Third Fork
Creek which is classified as Class WS-V. Nutrient Sensitive Waters (NSW) in the Jordan Lake Watershed within
the Cape Fear River Basin. The following observations were noted during the site inspection (See Attachment 1
for sampling location map):
The stormwater retention pond was discharging (Outfall 18468) and had a pH value of 12.32 s.u. and
specific conductance of (SpC) of 3,723 inicrosiemens/centimeter (uS/cm). The outfall was sampled for
hardness and total dissolved solids (TDS) and returned values of 780 mg/l for hardness and 1,050 mg/1 for
TDS.
o Outfall 108260 (sampling location Tf C-2; see map) had a pH value of 12.10 SAL, SpC of 1,089 mS/cm,
hardness of 280 mg/l, and TDS of 398 mg/l.
The stormwater discharge reaches surface waters approximately 1,100 feet southwest across Hwy. 147 at
Outfall 69014 (sampling location TFC-3, see map). The pH here was 9.97 s.u., SpC was 528.8 uS/cln,
hardness was 140 mg/l, and TDS was 338 mg/l.
Nothing Compares.__
State of North Carolina j Environmental Quality I water Resources J Raleigh Regional Office
1628 Mail service Center I Raleigh, North Carolina 27699-1528
919 791-4200
r
,... F :u, t.m ziAw;.s� ai ,,.. �..' N r# .h'., ~�' �w�"'d.G t��.A'f ` ' - c�,. a _r�dr t '•.` r rLr:. =e.. i,'- �$ o -, �s' , A T : ;

• The furthest downstream sampling location (TFC-4) returned a pH value of 8.96 s.u., SpC of 580 uS/cm,
hardness of 160 mg/l, and TDS of 347 in-Cl/ l.
Two control streams, labeled TFC-UTI and TFC-UT2, were sampled for field parameters only and
returned pH values of 8.45 s.u. and 8.48 s.u. and SpC of 1,123 uSlcm and 903 uSlcm respectively.
• A thick precipitate was coating substrate in the stream and the rocks at the outfall locations.
A City of Durham Stormwater and GIS Services Division file review revealed the following violations
and penalties:
-On December 6, 2016 the City of Durham issued a notice of violation (NOV) to Thomas Concrete for
illicit discharge of concrete pond wastewater.
-On July 11, 2017 the City of Durham issued a second NOV for illicit discharge noting that "no progress
was observed in the required cleanup of concrete wastes in the drainage system downstream of the
Thomas Concrete property."
-On August 25, 2017 the City of Durham issued a penalty assessment of $1,750.00 to Thomas Concrete
for the above violations, and on August 25, 2017 an additional penalty assessment of $3,500.00 was
issued.
A RRO-DWR file review revealed the following violation:
-On January 24, 2017 RRO-DWR issued a notice of violation — notice of intent to enforce for violation of
state water quality standards for pH (1 SA NCAC 02B .0211(3)(g)).
-Thomas Concrete was required to respond to the above referenced NOV, but failed to do so.
The site visits, sample results and file review revealed the following violations:
Item I. Stream- Standards-
Title 15A North Carolina Administrative Code 02B .0211 (3)(g) states that "pl-l: shall be normal for the waters in
the area, which generally shall range between 6.0 and 9.0 except that swamp waters may have a pH as low as 4.3
if it is the result of natural conditions;"
• Results from sample location labeled TFC-3 confirm a pH stream standard violation with a pFl of 9.97
SAL
Item IL Stream Standards -Hardness
Title 15A North Carolina Administrative Code 02B .0218 (3)(1) states that "Total hardness: not greater than 100
mg/l as calcium carbonate;"
• Results from sample locations labeled TFC-3 and TFC-4 confirm hardness stream standard violations
with hardness values of 140 mg/1 at TFC-3 and 160 mgll at TFC-4.
Requested Response:
You are requested to immediately address each of the beloiv items in writing within 30 days of receipt of
this letter.
1. Describe the work that has been done to the settling ponds/stormwater ponds since December, 2016.
2. Specifically, detail what housekeeping measures are in place to prevent wastewater from the site from causing
surface water pl-1 and hardness standard violations.
1 r °s u,sT .'� U4, 4�5� t Y .5, s�.�A�:b+".,1rnr-
Ia �, rJ .� -rt` ti
r
'.•.�+;i,»T-•..r.�—..«---�.y-.. _S

3. Explain how wastewater that exceeds pH of 9.0 and hardness of 100 mg/l will be prevented from discharging
from the facility to nearby surface waters.
4. Describe who you have contacted with the Division of Energy, Mining, and Land Resources (DEMLR)
regarding compliance with your Stormwater/Process Wastewater permit (NCG 140218) and the discharge of
water with pH levels exceeding 9.0 s.u. and hardness exceeding 100 mg/l. Detail how you will come into full
compliance with the requirements of DEMLR.
5. Please provide stormwater pond monitoring results from January 1, 2016 to the present date and describe the
location of the sampling point(s).
Please submit required materials to:
Jeremiah Dow
Division of Water Resources
3800 Barrett Drive
1628 Mail Service Center
Raleigh, NC 27699
This office requires that the violations, as detailed above, be abated immediately and properly resolved.
Environmental damage and violations of North Carolina Administrative Codes have been documented for the
subject site as stated above. Your efforts to undertake activities to bring the subject site back into compliance is
not an admission, rather it is an action that must be taken in order to begin to resolve ongoing environmental
issues.
These violations and any future violations are subject to a eivil penalty assessment of up to $25,000.00 per day for
each violation. Your response to this letter will be considered with any civil penalty action
recommendation. Should you have any questions regarding these matters, please contact Jeremiah Dow at (919)
791-4257 or via email at jeremiah.dowancdenr.gov.
Sic�ely,
✓�
Danny Smith
Water Quality Regional Operations
Raleigh Regional Office
Attachment 1 —Map
Attachment 2 — NC DWR Laboratory Results
cc: DWQ RRO file copy
Central Files
RRO DEMLR
Charlotte Dawn, City of Durham Stornnvater & GIS Services, 101 City Hall Plaza, Durham, NC 27701
Alan Wessel, President, Thomas Concrete of Carolina, Inc., 2500 Cumberland Pkwy., Ste, 200, Atlanta; GA
30339

Legend:
`- Map provided by NCDEQ Division of Water Resources
- Sampled for Hardness & TDS Q Thomas Concrete
- Field Parameters Only 0 Locations are approximate and are provided for reference only
TFC-1 (Outfall 18468) ~ _—
1 47 "J pl1:12.32
SpC: 3,723 uSlent
Hardness: 780 tng/l TFC-2 (Outfall 108260)
TDS: 1,050mg/I plL 12.10
SpC: 1,089 uS/ctn
Hardness: 280 mg/l
TDS: 398 mg/l
Durham
Technical
-
N ST% o -- �'
L�WSo - Community Crotl�
► "r,=c-3 (otru'adl 69014)
7 p11: 9.97 s.u.* 7
1 SpC: 528.8 uSlcan
'I'I C-U`I'I ! �Hardness: 140 mg/l * ��
pFI:B.=15 J�� -�. ., TDS: 338 mgjl
SpC: 1,123 tiSkin
Z ` r-� "ITC-4 (Outrtl!)
r p11: 8.96
a,V SpC: 580.1 uS/cm
`Q ` hardness: 160 tng/l
T[)ti: 347 ntgl]
ITC-UT2
p 11: 9.48
SpC: 903 uS/cnt
7
Third Fora: Creek - WS-V, NSW L��
Sur{ace Water Standards: .0
Total llardness: 100 mg/l (NCAC 02B'.0218 (3)(1)
Total Dissolved Solids: 500 tng/l (NCAC 0211 .0218 (3)(g)
p11: Between 6.0 and 9.0 (NCAC 0213 .021 1 (3)(g)
* Red text indicates a surface water standard violation Z
l .n,v \ \1 IV \a ,l I %/ O

AC46646 North Carolina Division of Water Resources Water Sciences Section Laboratory Results
YLoc. Descr.:
THIRD FORK CREEK, DURHAM
County:
Durham
Collector:
J DOW
VisitlD
Region:
RRO
Report To
RRO
Location ID:
TFC-1
River Basin
CPF01
Collect Date:
0112512018
Priority
COMPLIANCE
Emergency
Collect Time:
10'30
Sample Matrix:
SURFACEWATER
COC YeslNo
Yes
Sample Depth
Loc. Type: '
RivedStream
Final Report
Sample 10
AC46646
PO Number d
Date Received:
0112612018
Time Received:
13,:10
Labworks LoginlD
MSWIFT
Deliverf Method
Hand Delivered
Final Report Date:
3113119
Report Print Date:
0311312018
If this report is labeled preliminary report, the results have not been validated. Do not use for Regulatory purposes.
Result/
Method
Analysi s
CAS # Anal to Name PQL
t
Qualifier
Units
Reference
Date
Validated by
LAS
Sample temperature at receipt by lab
1.3
'C
1126I18
PGAUTHIER
WET
Total Dissolved Solids in liquid 12
1050
mg1L
SM 2544 0-1927
1126I18
CGREEN
... _...
MET
---
Hardness by Titration 1.0
780
mg1L
SM 234OC-1997
27118
ESTAFFORDI
4
HISS Chemistry Laboratory» 1623 Polail Service Center, Raleigh, NC 27699-1623 [phone]
"Nat Detected" or "Ll" does not indicate the sample is anaiyte free but that the analyte is not detected at or above the PQL.
Page 1 of 1

AC46647
North Carolina Division of Water Resources Water Sciences Section Laboratory Results
Loc. Descc:
County:
Region:
River Basln
Emergency
COC Yes/No
THIRD FORK CREEK—DURHAM
Durham Collector:
J DOW
VisltlD
RRO Report To
RRO
Location ID:
TFC-2
CPF01 Collect Date:
0112512018
Priority
COMPLIANCE
Collect Time:
11_00
Sample Matrix:
SURFACEWATER
Yes Sample Depth
Loc. Type.
River/Stream
Sample ID:
AC46647
PO Number #
Date Received:
0112512018
Time Received:
13__10
Labworks LoginlD
MSWIFT
Delivery IUethod
Hand Delivered
Final Report {Date:
3113118
Report Print Date:
0311312018
r-inal meporE
If this report is labeled preliminary report, the results have not
been validated.
Do not use for Regulatory purposes.
Result/
Method
Analysis
CAS # Analyte Name
PQL
Qualifier
Units
Reference
Date
Validated by
LAB
Sample temperature at receipt by lab
1.3
C
1126r18
PGAUTHIER
WET
Total Dissolved Solids in liquid
12
398
mg1L
Sib1 2540 C-1997
1/26118
CGREEN
MET
Hardness by Titration
1.0
280
mgfL
SN1 2340C-1997
2f7115
ESTAFFORD1
WSS Chemistry Laboratory» 1623 Mail Service Center, Raleigh, NC 27699-1623 [phone]
Not Detected" or "U" does not indicate the sample is analyte free but that the analyte is not detected at or above the PQL,
Page 9 of 1
0

AC4r548
Loc. Descr.:
County:
Region:
River Basin
Emergency
COC Yes/No
North Carolina Division of Water Resources Water Sciences Section Laboratory Results
THIRD FORK CREEK, DURHAM
Durham Collector:
J DOW
VisltlD
RRO Report To
RRO
Location ID:
TFC-3
CPF01 Collect Date:
01/2512018
Priority
COMPLIANCE
Collect Time:
11_35
Sample Matrix:
SURFACEWATER
Yes Sample Depth
Loc. Type:
RiverlStream
Sample tD:
AC46648
PO Number #
Date Received:
01/2512018
Time Received:
13;10
Labworks LoginlD
MSWIFT
Delivery Method
Hand Delivered
Final Report Date:
3113118
Report Print Date:
03113I2018
f _inal mepofL
If this report is labeled preliminary report, the results have not
been validated. Do not use for Regulatory purposes.
Result/
Method
Analysis
CAS # Analyte Name
POL
Qualifier
Lal
Reference
Date
Validated by
LAB
Sample temperature at receipt by lab
1.3
°C
1120118
PGAUTHIER
WET
Total Dissolved Solids in liquid
12
338
mg1L
SM 2540 C-1997
V26118
CGREEN
MET
Hardness by Titration
1.0
140
mg1L
SM 2340C-1997
2f7118
FSTAFFCRDI
WSS Chemistry Laboratory>> 1623 Mail Service Center, Raleigh, NC 27699.1623 [phone]
"Not Detected" or "U" does not indicate the sample is analyte free but that the analyte is rot detected at or above the POL.
Page 1 of 1

AC46649 North Carolina Qiyision of Water Resources Water Seiences Section Laboratory Results
Loc. Descr.:
THIRD FORK CREEK DURHAM
County:
Durham
Collector:
J DOW
NAsitlD
Region:
RRO
Report To
RRO
Location ID:
TFC-4
River Basin
CPF I
Collect Date:
01125f2018
Priority
COMPLIANCE
Emergency
Collect Time:
122:27
Sample Matrbr
SURFACEWATER
COC Yes/No
Yes
Sample Depth
Loc. Type:
River/Stream
Sample ID:
AC46649
PO Number #
Date Received:
01125l2018
Time Received:
13_10
Labworks LaginlD
MSWIFT
Delivery Method
Hand Delivered
Final Report Date:
3113113
Report Print Date:
0311312018
rinal meporL
If this report is labeled preliminary report, the results have not been validated. Do not use for Regulatory purposes.
Result/ Units --Method Analysis
GAS # Analyte Name PQL Qualifier Reference Date Validated by
LAS
Sample temperature at receipt by lab 1.3 C V26118 PGAUTHIER
WET
Total Dissolved Solids in liquid 12 347 mglL SM 2540 C-1997 1126/18 CGREFN
MET
Hardness by Titration 1.0 160 mg1L SM 2340C-1997 2f7118 ESTAFFORDI
WSS Chemistry Laboratory>> 1623 Mail Service Center, Raleigh, NC 27699.1623 [phone]
"Plot Detected" or "U" does not indicate the sample is analyse free but that the analyte is not detected at or above the PQL.
Page 1 of 1

n
t ANNUAL SUMMARY DISCHARGE MONITORING
REPORT (DMR) —STORMWATER
SUBMIT TO CENTRAL OFFICE*
General Permit No. NCG140000
Calendar Year 2017
*Report ALL STORMWATER monitoring data on this form (include "No Flow'T'No Discharge" and Benchmark
Exceedances) from the previous calendar year to the DEQ by MARCH 1 of each year.
Certificate of Coverage No. NCG140218 RECEIVED
Facility Name: Thomas Concrete of Carolina — Durham Plant FE9 2 0 2013
County: Durham CENTRAL FILES
Phone Number: [phone] Total no. of SDOs monitored' li{SECTIO�I
Certified Laboratory ESC Lab # ENV 375
Lab #
Stormwater Discharge Outfall (SDO) No. 001 VMA Outfall? Yes ® No ❑
Is this outfall currently in Tier 2 for any parameter? Yes ® No ❑
Was this outfall ever in Tier 2 during the past year? Yes ® No ❑
If this outfall was in Tier 2 last year, was monthly monitoring discontinued?
Yes, enough consecutive samples below benchmarks to decrease frequency ❑
Yes, received approval from DEMLR to reduce monitoring frequency ❑
Other ❑
Outfall No.
Total Rainfall,
inches
Total
Suspended
Solids TSS
{ ]�
m 11
pH,
SU
Non -polar O&G
(EPA Method
1664 SGT-HEM
{ ]��
mgll (VMA}
If applicable
New Motor Oil
Usage (gallmo.)
If applicable
Stormwater
Benchmarks
l
Indicate
appikable icable N
Circle Benchmark
100150
6.0-9.0
15
a55 gallmo. average requires TSS and
Non -polar O&G monitoring
Date Sample
Collected,
molddl r
Willi 1i
01/31/17
NO FLOW
02/02/17
NO FLOW
03/31 /17
1.25
125
11.66
04/30/17
NO FLOW
05/31/17
NO FLOW
06/30/17
NO FLOW
07/31/17
NO FLOW
08/31/17
NO FLOW
09/30/17
NO FLOW
10/31/17
NO FLOW
11/30/17
NO FLOW
12/31/17
NO FLOW
Permit Date 8/1/2017 — 6/3012022
Last Revised 8-22-2015

Certificate of Coverage No. NCG 140218
Additional Outfall Attachment (make copies as needed for additional outfalls)
Stormwater Discharge Outfall (SDO) No. VMA Outfall? Yes ❑ No ❑
Is this outfall currently in Tier 2 for any parameter? Yes ❑ No ❑
Was this outfall ever in Tier 2 during the past year? Yes ❑ No ❑
If this outfall was in Tier 2 last year, was monthly monitoring discontinued?
Yes, enough consecutive samples below benchmarks to decrease frequency ❑
Yes, received approval from DEMLR to reduce monitoring frequency ❑
Other ❑
Outfall No.
Total Rainfall,
inches
Total
Suspended
Solids (TSS),
mg/1
pH,
SU
Non -polar O&G
(EPA Method
1664 SGT-HEM ,,
(
mgll (VMA)
11 appiicable
New Motor Oil
Usage (galimo.)
Napplicable
Stormwater
Benchmarks
lndlcara NO FL01Ni(
applicable
hmark
Circle Benctt
1 aOjJ�
6.0-�.4
1 $
�55 g allma. average requires T55 and
Non -polar 6&G monitoring
Date Sample
Collected,
molddl r
Permit Date 8/1/2017 — 6/30/2022
Last Revised 8-22-2015

Certificate of Coverage No. NCG140218
Additional Outfall Attachment (make copies as needed for additional outfalls)
Stormwater Discharge Outfall (SDO) No. VMA Outfall? Yes ❑ No ❑
Is this outfall currently in Tier 2 for any parameter? Yes ❑ No ❑
Was this outfall ever in Tier 2 during the past year? Yes ❑ No ❑
If this outfall was in Tier 2 last year, was monthly monitoring discontinued?
Yes, enough consecutive samples below benchmarks to decrease frequency ❑
Yes, received approval from DEMLR to reduce monitoring frequency ❑
Other ❑
Outfall No.
Total Rainfall,
inches
Total
Sus ended p
Solids {TSS),
mg/1
p H,
5U
Non -polar O&G
(EPA Method
1664 (SGT-HEM)),
mgll (VMA)
New Motor Oil
Usage (gallmo.)
5formwater
Benchmarks
Indicate NO FLOW li
applicable
Circle Benchmark
1 5v
1UU150
6. U_9. V
.� �
�55 g allmo. average requires TSS and
Non -polar O&G monitoring
Date Sample
Collected,
molddl r
Permit Date 8/1/2017 — 6/30/2022
Last Revised 8-22-2015

Certificate of Coverage No. NCG140218
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 violations."
(Required by 40 CFR 6122.227
Signs
Date
Mail Annual Summary Stormwater DMR to the NCDEQ Central Office:
Note the address is correct - Central Files is housed in DWR (not DEMLR)
N.C. Department of Environmental Quality (DEQ)
Division of Water Resources
Attn: DWR Central Files
1617 Mail Service Center
Raleigh, NC 27699-1617
Central Files Telephone [phone]
Questions? Contact DEMLR Stormwater Permitting Staff in the Central Office at:
[phone]
Permit Date 8/1/2017 - 6/30/2022
Last Revised 8-22-2015

STORMWATER DISCHARGE OUTFALL (SDO) - Semi -Annual MONITORING FORM
GENERAL. PERMIT NO. NC6140000
CERTIFICATE OF COVERAGE NO. NCG140218 SAMPLE COLLECTION YEAR: 2017
FACILITY NAME: Thomas Concrete of Carolina -Durham Plant SAMPLING PERIOD: ❑ July -December ® January -June
PERSON COLLECTING SAMPLES Kevin Kelt COUNTY Durham
CERTIFIED LABORATORY ESC Lab # ENV 375 PHONE NO. [phone]
Lab # ADD TO LISTSERVE? ❑YES ❑NO EMAIL:
OPTIONAL INFO: April Monitoring event DISCHARGING TO CLASS: ❑SA ❑HQW ❑PNA ❑Trout ®Other,
Part A: Stormwater Monitoring Requirements
Outfall No.
Date Sample
Collected
(ma/dd/yr OR
NO FLOW)'
pH
(Standard
Units)
TSS
(mg/L)
Event
Duration
(minutes]
Total 4
Rainfall
{in)
In Tier 2
Monthly
Monitoring?
(y/n)
# of Months in Tier
Z
2 Sampling
-
-
6-9
100 '
-
-
-
001
NO FLOW
Click here to
enter text.
Click here to
enter text.
Click here to
enter text.
y
38
If "NO FLOW" or "NO DISCHARGE, Enter "NO FLOW" or "NO DISCHARGE" for each outfall here. Please make sure to mark the sample period above.
2 If a value is in excess of the benchmark, or outside the benchmark range (for pH), you must implement the Tier 1 or Tier 2 responses in the General Permit. Tier 2
Monthly sampling shall be done until 3 consecutive samples are below the benchmark or within the benchmark range.
Permit Date: 7/1/2011-60/30/2015 Last Revised 7/13/11
Page 1 of 2

Part 6: Vehicle Maintenance Activity Monitoring Requirements for facilities using > 55 gal of new motor oil/month — averaged over a calendar year.
Outfall
No.
Date Sample
Collected
(mo/dd/yr]1
PH
(Standard
Units)
TPH using method
1664A5GT-NfM
(mg/L)
Total Suspended
Solids
(mg/L)
Event
duration
(minutes)
Total
a
Rainfall
(in)
New Motor Oil
Usage
(gal/month]
In Tier 2
Monthly
Monitoring?
(y/n)
# of Months
in Tier 2
2
Sampling
6-9
15
100 '
-
-
-
-
-
HAS YOUR FACILITY HAD 4 OR MORE BENCHMARK EXCEEDENCES AT ANYONE OUTFALL (INCLUDING VEHICLE MAINTENANCE)? YES ❑ NO
HAVE YOU CONTACTED THE REGION? YES ❑ NO
REGIONAL OFFICE CONTACT NAME:
Mail Original and one coov of this DMR (including all "No Flow" & "No Discharge" reports) within 30 days of receipt of sample for at end of monitoring period
in case of "No Flow") to:
Division of Water Quality
Attn: DWQ Central Files
1617 Mail Service Center
Raleigh, North Carolina 27699-1617
YOU MUST SIGN THIS CERTIFICATION FOR ANY INFORMATION REPORTED:
"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 violations."
c a"Z z4u,- 'LG7i 4/30/2017
(Signature of Permittee) V (Date)
Permit Date: 7/1/2011-60/30/2015
Last Revised 7/13/11
Page 3 of 2

PROCESS WASTEWATER — Quarterly Discharge Monitoring Report
GENERAL PERMIT No. NCG140000
CERTIFICATE OF COVERAGE NO. NCG140218 SAMPLE COLLECTION YEAR: 2017
FACILITY NAME: _Thomas Concrete of Carolina- Durham Plant SAMPLE QUARTER: ❑Jul -Sept ❑Oct -Dec ®Jan -March
PERSON COLLECTING SAMPLES: Kevin Kelt COUNTY: Durham
CERTIFIED LABORATORY:ESC Lab # N j5 IVEPHONE NO. (_704 _) 853-9437
_
February 2017_Lab # nn , ,y ADD TO LISTSERVE? DYES ®NO EMAIL:
LIMIT VIOLATIONS? YES ® NO ❑ i a ,01 /DISCHARGING TO CLASS: [:]SA ❑HQW ❑PNA ❑Trout ®Other
Part A: Wastewater Monitoring Requirements
CENTRAL FILDOPTIONAL INFO:
DWR SECTION
❑April -tune
Outfall No.
Date Sample
1
Collected
(mm/dd/yr)
Type of Wastewater
z
(VE, RM, MD)
pH
(standard)
Total Suspended
Solids
(mg/L)
Settleable
Solids
(mL/L)
TPH using I
method 1664A
SGT-HEM
(mg/L)
Discharge
Duration
(minutes)
Total Flow
�
(gallons/day)
-
-
6-93,4
303'5
53
(15),
-
-
001
3/31/2017
VE, RM
11.2
57.1
<0.033
Total Flow:
5,990 gpd
1 If wastewater systems have not discharged in this quarter — report "No Flow" or "No Discharge" here. Please make sure to mark the sample quarter above.
2 Report the abbreviation for the type of Authorized Wastewater Discharges here: Vehicle and Equipment Cleaning (VE), Raw Material Stockpiles (RM), Mixing Drum
Cleanout (MD). Report more than one type if the waste -stream is commingled.
3 if an effluent limit is exceeded twice in a row, the permittee is required to institute monthly monitoring for that parameter for six months, unless DWQ RO staff
notifies you to continue monitoring.
Permit Date: 7/1/2010-06/30/2015
Last Revised 07/13/11
Page 1 of 2

° pH limits are 6-9 S.U. for wastewater discharges to freshwaters, and 6.8-8.5 S.U. for discharges to saltwaters.
5 TSS limits are 20 mg/L for wastewater discharges to HQW waters, 10 mg/L for Trout and PNA waters, and 30 mg/L for all other water classifications.
6 Process wastewater discharges shall only be monitored for TPH when commingled with stormwater discharges from VMA areas. TPH does not have a limit for wastewater,
but instead is subject to benchmarks and provisions of Part IV, Section A, including the Tiered Response Action.
Flow rate can be measured continuously or calculated. Flow limits for wastewater discharges to HQW waters shall be set to 50% of the Summer 7Q10 Flow as per 1SA
NCAC 02B .0224. Permittees who discharge wastewater to HQW waters shall obtain a Summer 7Q10 flow and report this information to DWQ. If the permittee cannot
obtain a Summer 7Q10 flow for the receiving waters at the discharge location, the permittee shall notify DWQ, and the DWQ Regional Office may require an annual flow
report on a case -by -case basis.
MAIL ORIGINAL AND ONE COPY OF THIS ANNUAL SUMMARY (INCLUDING ALL "NO FLOW", "NO DISCHARGE") WITHIN 30 DAYS OF RECEIPT OF SAMPLE (OR
AT END OF MONITORING PERIOD IN CASE OF "NO FLOW") TO:
Division of Water Quality
Attn: DWQ Central Files
1617 Mail Service Center
Raleigh, North Carolina 27699-1617
[phone]
YOU MUST SIGN THIS CERTIFICATION FOR ANY INFORMATION REPORTED:
"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. eased 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
violations."
• Permit Date:7/1/2010-06/30/2015
Last Revised 07/13/11
Page 2 of 2

(Signature of Permittee)
3/31/2017
(Date)
Permit Date: 7/1/2010-06/30/2015 Last Revised 07/13/11
Page 3 of 2

NCDENR
Stormwater Discharge Outfall (SDO)
Qualitative Monitoring Report
For guidance on filling out this farm, please visit. hU:I/portal,ncdenrsorLy/web/lr/ni2de-s-stormwater/
Permit No.: N/�/_/_/_/_/_/_/_/ or Certificate of Coverage No.:
Facility Name: Thomas Concrete of Carolina -Durham Plant
County: Durham Phone No. [phone]
Inspector: Kevin Kelt
Date of Inspection: 3 31 2017
Time of Inspection: 1436
Total Event Precipitation (inches): 1.25"
Was this a "Representative Storm Event" or "Measureable Storm Event" as defined by the permit?
(See information below.)
M Yes ❑ No
Please verify whether Qualitative Monitoring must be performed during a "representative storm
event" or "measureable storm event" (requirements vary, depending on the permit).
Qualitative monitoring requirements vary. Most permits require qualitative monitoring to be
performed during a "representative storm event" or during a "measureable storm event." However,
some permits do not have this requirement. Please refer to these definitions, if applicable.
A "representative storm event" is a storm event that measures greater than 0.1 inches of rainfall
and that is preceded by at least 72 hours (3 days) 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.
A "measurable storm event" is a storm event that results in an actual discharge from the
permitted site outfall. The previous measurable storm event must have been at least 72 hours
prior. The 72-hour storm interval does not apply if the permittee is able to document that a shorter
interval is representative for local storm events during the sampling period, and the permittee
obtains approval from the local DWQ Regional Office.
By this signature, I certify that this report is accurate and complete to the best of my knowledge:
(Signature of Permittee or Designee)
Pagel of 2
5WU-242, Last modified 7/31/2013

1. Outfall Description:
Outfall No. 01 Structure (pipe, ditch, etc.) Weir Outlet
Receiving Stream: Third F rk Creek Branch
Describe the industrial activities that occur within the outfall drainage area: Bulk storage
of raw materials vehicle transport, wastewater treatment.
2. Color: Describe the color of the discharge using basic colors (red, brown, blue, etc.) and tint
(light, medium, dark) as descriptors: light yellow tint
3. Odor: Describe any distinct odors that the discharge may have (i.e., smells strongly of oil,
weak chlorine odor, etc.): very slight odor
4. Clarity: Choose the number which best describes the clarity of the discharge, where 1 is
clear and 5 is very cloudy:
1 2 3 4 5
5. Floating Solids: Choose the number which best describes the amount of floating solids in
the stormwater discharge, where 1 is no solids and 5 is the surface covered with floating solids:
1 2 3 4 5
6. Suspended Solids: Choose the number which best describes the amount of suspended
solids in the stormwater discharge, where 1 is no solids and 5 is extremely muddy:
1 2 3 4 5
7. Is there any foam in the stormwater discharge? Yes No
8. Is there an oil sheen in the stormwater discharge? Yes No
9. Is there evidence of erosion or deposition at the outfall? Yes No
10. Other Obvious Indicators of Stormwater Pollution:
List and describe pH: 11.66
Note: Low clarity, high solids, and/or the presence of foam, oil sheen, or erosion/deposition
may be indicative of pollutant exposure. These conditions warrant further investigation.
Page 2 of 2
SWU-242, Last modified 7/31/2013
I

` STORMWATER DISCHARGE OUTFALL (SDO) - Semi -Annual MONITORING FORM
GENERAL PERMIT NO. NCG140000
CERTIFICATE OF COVERAGE NO. NCG140218 SAMPLE COLLECTION YEAR: 2017
FACILITY NAME: Thomas Concrete of Carolina -Durham Plant SAMPLING PERIOD: El July -December ® January -June
PERSON COLLECTING SAMPLES Kevin Kett COUNTY Durham
CERTIFIED LABORATORY ESC Lab # ENV 375 PHONE NO. [phone]
Lab # ADD TO LISTSERVE? ❑YES ❑NO EMAIL:
OPTIONAL INFO: March Monitoring event DISCHARGING TO CLASS: [:]SA ❑HQW []RNA ❑Trout ®Other
Part A: Stormwater Monitoring Requirements
Outfall No.
Date Sample
Collected
(mo/dd/yr OR
NO FLOW)1
pH
{Standard
Units)
TSS
(mg/L)
Event
Duration
(minutes)
Total 4
Rainfall
(in)
In Tier 2
Monthly
Monitoring?
(y/n)
# of Months in Tier
2 Samplingz
-
-
6-9
100 ,
-
-
001
3/31/2017
11,66
125
60
1.25
y
37
r:
� C
11 ,ad"iV1.-
APR
17 201/
rs1ro/%j
Ci r
y
SCC710N
' If "NO FLOW" or "NO DISCHARGE, Enter "NO FLOW" or "NO DISCHARGE" for each outfall here. Please make sure to mark the sample period above.
' If a value is in excess of the benchmark, or outside the benchmark range (for pH), you must implement the Tier 1 or Tier 2 responses in the General Permit. Tier 2
Monthly sampling shall be done until 3 consecutive samples are below the benchmark or within the benchmark range.
a TSS benchmark values are 100 mg/I, except when discharging to ORW, HQW, Trout, and PNA waters where they are 50 mg/l.
4 For each sampled measurable storm event the total precipitation must be recorded using data from an on -site rain gauge.
Permit Date: 7/1/2011-60/30/2015 Last Revised 7/13/11
Page 1 of 2

Part 8: Vehicle Maintenance Activity Monitoring Requirements for facilities using > 55 gal of new motor oil/month — averaged over a calendar year.
Outfall
No.
Date Sample
Collected
(mo/dd/yr)1
pH
(standard
Units)
TPH using method
1664ASGT-FIEM
( mg/ } L
Total Suspended
Solids
L
(mg/ }
Event
Duration
(minutes)
(
Total
a
Rainfall
(in)
(
New Motor Oil
Usage
(gal/month)
In Tier 2
Monthly
Monitoring?
(y/n'
# of Months
in Tier 2
Sampling2
6-9
15
100 '
-
-
-
-
-
HAS YOUR FACILITY HAD 4 OR MORE BENCHMARK EXCEEDENCES AT ANY ONE OUTFALL (INCLUDING VEHICLE MAINTENANCE)? YES ❑ NO
HAVE YOU CONTACTED THE REGION? YES ❑ NO
REGIONAL OFFICE CONTACT NAME:
Mail Orieinal and one cor)v of this DMR (includine all "No Flow" & "No Dischame" rer)orts) within 30 days of receiot of samrfle for at end of monitorine Deriod
in case of "No Flow") to:
Division of Water Quality
Attw DWQ Central Files
1617 Mail Service Center
Raleigh, North Carolina 27699-1617
YOU MUST SIGN THIS CERTIFICATION FOR ANY INFORMATION REPORTED:
"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 violations."
(Vgnature of Permittee)
Permit Date: 7/1/2011-60/30/2015
3/31/2017
(Date)
Last Revised 7/13/11
Page 2 of 2

'GiAA
A
NCDENR
Stormwater Discharge Outfall (SDO)
Qualitative Monitoring Report
Forguidance on filling out this form, please visit: j up;//portal.ncdenr.org/we Ir/nodes-stormwater/
Permit No.: N/C/Y/_/_/_/�/ _/_/ or Certificate of Coverage No.:
Facility Name: Thomas Concrete of Carolina -Durham Plant
County: Durham Phone No. [704) 853-9437
Inspector: Kevin Kelt
Date of Inspection: 3/31/2017
Time of Inspection: 1436
Total Event Precipitation (inches): 1.25"
Was this a "Representative Storm Event" or "Measureable Storm Event" as defined by the permit?
(See information below.)
® Yes ❑ No
Please verify whether Qualitative Monitoring must be performed during a "representative storm
event" or "measureable storm event" (requirements vary, depending on the permit).
Qualitative monitoring requirements vary. Most permits require qualitative monitoring to be
performed during a "representative storm event" or during a "measureable storm event." However,
some permits do not have this requirement. Please refer to these definitions, if applicable.
A "representative storm event" is a storm event that measures greater than 0.1 inches of rainfall
and that is preceded by at least 72 hours (3 days) 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.
A "measurable storm event" is a storm event that results in an actual discharge from the
permitted site outfall. The previous measurable storm event must have been at least 72 hours
prior. The 72-hour storm interval does not apply if the permittee is able to document that a shorter
interval is representative for local storm events during the sampling period, and the permittee
obtains approval from the local DWQ Regional Office.
By this signature, I certify that this report is accurate and complete to the best of my knowledge:
�'"iuza C���447,/
(Signature of Permittee or Designee)
Page 1 of 2
5WU-242, Last modified 7/31/2013

1. outfall Description:
Outfall No. 01 Structure (pipe, ditch, etc.) Weir Outlet
Receiving Stream: Third Fork Creek branch
Describe the industrial activities that occur within the outfall drainage area: Bulk storage
of raw materials, vehicle transport, wastewater treatment.
2. Color: Describe the color of the discharge using basic colors (red, brown, blue, etc.) and tint
(light, medium, dark) as descriptors: light yellow tint
3. Odor: Describe any distinct odors that the discharge may have (i.e., smells strongly of oil,
weak chlorine odor, etc.): ver.y slight odor
4. Clarity: Choose the number which best describes the clarity of the discharge, where 1 is
clear and 5 is very cloudy:
1 2 3 4 5
S. Floating Solids: Choose the number which best describes the amount of floating solids in
the stormwater discharge, where 1 is no solids and 5 is the surface covered with floating solids:
1 2 0
4 5
6. Suspended Solids: Choose the number which best describes the amount of suspended
solids in the stormwater discharge, where 1 is no solids and 5 is extremely muddy:
1 2 3 4 5
7. Is there any foam in the stormwater discharge? Yes No
8. Is there an oil sheen in the stormwater discharge? Yes No
9. Is there evidence of erosion or deposition at the outfall? Yes No
10. Other Obvious Indicators of Stormwater Pollution:
List and describe pH: 11.66
Note: Low clarity, high solids, and/or the presence of foam, oil sheen, or erosion/deposition
may be indicative of pollutant exposure. These conditions warrant further investigation.
Page 2 of
5wU-242, Last modified 7/31/2013

Aroa
NCDENR
Stormwater Discharge Outfall (SDO)
Qualitative Monitoring Report
Forguidance on filling out this form, please visit. htto://portalmcdennore/web/lr/nodes-stormwater/
Permit No.: N/C/_/_/_/_/_/_/_/ or Certificate of Coverage No.:
Facility Name: Thomas Concrete of Carolina -Durham Plant
County: Durham Phone No. [phone]
Inspector: Kevin Kelt
Date of Inspection: 3 31 2 17
Time of Inspection: 1436
Total Event Precipitation (inches): 1.25"
Was this a "Representative Storm Event" or "Measureable Storm Event" as defined by the permit?
(See information below.)
® Yes ❑ No
Please verify whether Qualitative Monitoring must be performed during a "representative storm
event" or "measureable storm event" (requirements vary, depending on the permit).
Qualitative monitoring requirements vary. Most permits require qualitative monitoring to be
performed during a "representative storm event" or during a "measureable storm event." However,
some permits do not have this requirement. Please refer to these definitions, if applicable.
A "representative storm event" is a storm event that measures greater than 0.1 inches of rainfall
and that is preceded by at least 72 hours (3 days) 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.
A "measurable storm event" is a storm event that results in an actual discharge from the
permitted site outfall. The previous measurable storm event must have been at least 72 hours
prior. The 72-hour storm interval does not apply if the permittee is able to document that a shorter
interval is representative for local storm events during the sampling period, and the permittee
obtains approval from the local DWQ Regional Office.
By this signature, I certify that this report is accurate and complete to the best of my knowledge:
(Signature of Permittee or Designee)
Pagel of 2
SWU-242, Last modified 7/31/2013

1. Outfall Description:
Outfall No. 01 Structure (pipe, ditch, etc.) Weir Outlet
Receiving Stream: Third Fork Creek Branch
Describe the industrial activities that occur within the outfall drainage area: Bulk storage
of raw materials, vehicle transport, wastewater treatment.
Z. Color: Describe the color of the discharge using basic colors (red, brown, blue, etc.) and tint
(light, medium, dark) as descriptors: light yellow tint
3. Odor: Describe any distinct odors that the discharge may have (i.e., smells strongly of oil,
weak chlorine odor, etc.): very sight odor
4. Clarity: Choose the number which best describes the clarity of the discharge, where 1 is
clear and 5 is very cloudy:
1 2 3 4 5
S. Floating Solids: Choose the number which best describes the amount of floating solids in
the stormwater discharge, where 1 is no solids and 5 is the surface covered with floating solids:
1 2 3 4 5
6. Suspended Solids: Choose the number which best describes the amount of suspended
solids in the stormwater discharge, where 1 is no solids and 5 is extremely muddy.
1 2 3 4 5
7. Is there any foam in the stormwater discharge? Yes No
8. Is there an oil sheen in the stormwater discharge? Yes No
9. Is there evidence of erosion or deposition at the outfall? Yes No
10. Other Obvious Indicators of Stormwater Pollution:
List and describe pH:
Note: Low clarity, high solids, and/or the presence of foam, oil sheen, or erosion/deposition
may be indicative of pollutant exposure. These conditions warrant further investigation.
Page 2 of 2
5WU-242, Last modified 7/31/2013

STORMWATER DISCHARGE OUTFALL (SDO) - Semi -Annual MONITORING FORM
GENERAL PERMIT NO. NCG140000
CERTIFICATE OF COVERAGE NO. NCG140218
FACILITY NAME: Thomas Concrete of Carolina -Durham Plant
PERSON COLLECTING SAMPLES Kevin Kelt
CERTIFIED LABORATORY ESC Lab # ENV 375�
Lab #
OPTIONAL INFO: February Monitoring event
Part A: Stormwater Monitoring Requirements
SAMPLE COLLECTION YEAR: 2017
SAMPLING PERIOD: ❑ July -December ® January -June
COUNTY Durham
PHONE NO. [phone]
ADD TO LISTSERVE? ❑YES ❑NO EMAIL:
DISCHARGING TO CLASS: ❑SA ❑HQW ❑PNA ❑Trout ®Other
Outfall No.
Date Sample
Collected
(mo/dd/yr OR
NO FLOW)'
pH
(Standard
Units}
T55
(mg/L)
Event
Duration
(minutes}
Total
Rainfall°
(in}
In Tier 2
Monthly
Monitoring?
(y/n}
# of Months in Tier
2 Sampling2
-
-
6-9
100 .
-
-
-
-
001
NO FLOW
y
36
- ^- L_ !
MAR 2 1. 201;
1NR S _ ' "
' If "NO FLOW" or "NO DISCHARGE, Enter "NO FLOW" or "NO DISCHARGE" for each outfall here. Please make sure to mark the sample period above.
z If a value is in excess of the benchmark, or outside the benchmark range (for pH), you must implement the Tier 1 or Tier 2 responses in the General Permit. Tier 2
Monthly sampling shall be done until 3 consecutive samples are below the benchmark or within the benchmark range.
3 T55 benchmark values are 100 mg/I, except when discharging to ORW, HQW, Trout, and PNA waters where they are 50 mg/I.
Permit Date: 7/1/2011-60/30/2015 Last Revised 7/13/11
Page 1 of 2

Part B: Vehicle Maintenance Activity Monitoring Requirements for facilities using > 55 gal of new motor oil/month — averaged over a calendar year.
Outfall
No.
Date Sample
Collected 1
(mo/dd/yr)
pH
(standard
Units)
TPH using method
I664A SGT-HEM
(mg/L)
Total Suspended
Solids
(mg/L)
Event
Duration
(minutes)
Total
a
liainfall
(in)
New Motor Oil
Usage
(gal/month)
In Tier 2
Monthly
Monitoring?
(y/n)
#i of Months
in Tier 2
Samplingz
6-9
15 2.100
'
-
-
-
-
HAS YOUR FACILITY HAD 4 OR MORE BENCHMARK EXCEEDENCES AT ANY ONE OUTFALL (INCLUDING VEHICLE MAINTENANCE)? YES ❑ NO
HAVE YOU CONTACTED THE REGION? YES ❑ NO
REGIONAL OFFICE CONTACT NAME:
Mail Orieinal and one cape of this DMR tincluding all "No Flow" & "No Discharge" reports) within 30 days of receipt of sample for at end of monitorine period
in case of "No Flow"} to:
Division of Water Quality
Attn: DWQ Central Files
1617 Mail Service Center
Raleigh, North Carolina 27699-1617
YOU MUST SIGN THIS CERTIFICATION FOR ANY INFORMATION REPORTED:
"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
am aware there 'ficant penalties for submitting false information, including the possibility of fines and imprisonment for knowing violations."
2G%/ 2/28/2017
(Signature of Permittee)
Permit Date:7/1/2011-60/30/2015
(Date)
Last Revised 7/13/11
Page 3 of 2

r�
Water Resources
ENVIRONMENTAL QUALITY
Certified Mail #701=4 3490 0001 8821 1474
Return Receipt Requested
Brian Westfall, Plant Manager
Thomas Concrete
2722 Angier Ave
Durham, NC 27703
Dear Mr. Westfall:
ROY COOPER
Govemor
MICHAEL S. REGAN
Se croary
S. JAY ZIMMERMAN
9srector
January 24, 2017
RECEIVED
JAN 2 7 .Zu17
CENTRAL FILES
DWR SECTION
Notice of Violation -Notice of Intent to Enforce
Case No: NOV-2017-PC-0006
Illegal Discharge of Stormwater/Removal of Use
Thomas Concrete
NPDES Permit No. NCG 1402 t 8
Durham County
On November 29, 2016, Jonathan Baker and Charlotte Dawn with Durham County Stormwater and GIS
services reported concerns regarding the discharge wastewater from a stormwater detention pond at
Thomas Concrete (2722 Angier Ave, Durham). They also reported that a follow-up inspection in
November 2016 revealed that the problem had not been corrected and that pH at the outfall was 13.2 s.u.
and specific conductance was 1778 ins/cm.
On December 19, 2016, Danny Smith and Ray Milosh with the Raleigh Regional Office (RRO) of the
Division of Water Resources (DWR) and staff from Durham County' Stormwater and GIS services
conducted a joint site visit. The following observations were noted during the site inspection:
+ The stormwater retention pond had evidence of recent work. The water level in the pond was
below the overflow pipe.
• Water was seen exiting from the outlet of the overflow pipe, indicating that the overflow pipe had
a leak.
• There was an inflatable bladder at the outlet of the overflow pipe that was not holding back the
water.
• The pH of the water exiting the pipe was 13.6 and the specific conductance (SpC) was 866
ms/cm. A thick orange/tan precipitate was seen covering the streambed and rocks in the
streambed. (see photograph 1).
Division of Water Resources, Raleigh Regional Office, Water Quality Operations Section http://ponal.ncdenr.org/webhvq/aps
1628 Mail Service Center. Raleigh. NC 27699-1628 Phone: [phone]
Location: 3800 Barrett Drive. Raleigh, NC 27609 Fax: [phone]

i
• The pH of the water exiting the culvert under the railroad tracks approximately 200 feet downstream
Of the outfall was 10.06 and the SpC was 318 mslcm. A thick orange/tan precipitate was covering the
streambed and rocks. (see photograph 2)
Photograph 2. Water exiting culvert under the railroad tracks about 200 feet downstream of the outfall
from Thomas Concrete. Note orange/tan precipitate covering streambed and stones.

1-
Photograph 3. Water exiting culvert under 1-lwy 147 approximately 800 feet downstream of
Thomas Concrete. Note precipitate on streambed and rocks.
The pH of the streamwater exiting a pipe under Hwy 147 approximately 800 feet downstream of
the outfall was 9.6 s.u. and the SpC was 363 mslcm. (see photograph 3). An orange/tan

W
precipitate was covering some parts of the streambed and rocks. Photograph 3, depicted above,
is an unnamed tributary to Third Fork Creek, Class WS-V Nutrient Sensitive Waters (NSW) in the
Cape Fear River Basin.
The site inspection and sample results revealed the following violations of North Carolina General
Statutes, North Carolina Administrative Codes, and NPDES permit conditions (NC0049662) which state
following:
NCGS 143-215.1 a 6
"Activities for Which Permits Required. — No person shall do any of the following things or carry out any
of the following activities unless that person has received a permit from the Commission and has complied
with all conditions set forth in that permit.
(6) cause or permit any waste, directly or indirectly, to be discharged to or in any manner intermixed with
the waters of the State in violation of the water quality standards applicable to the assigned classifications
or in violation of any effluent standards or limitations established for any point source, unless allowed as
a condition of any permit, special order or other appropriate instrument issued or entered into by the
Commission under the provisions of this Article."
15 A NCAC 02B .0211 14
pH: shall be normal for the waters in the area, which range between 6.0 and 9.0 except that swamp waters
may have a pH as low as 4.3 if it is the result of natural conditions;
Requested Response
This office requests that you respond to this letter in writing within 30 days of receipt of this Notice.
Your response should be sent to this office at the letterhead address. Your response should address the
following items:
l . Please describe the work that has been done to the settling ponds/stormwater ponds during
this past year (2016). This account should include all settling ponds/stormwater ponds
effluent monitoring, maintenance, and residuals removal and depths of solids.
2. Specifically, detail what housekeeping measures are in place to prevent wastewater from the
site from causing surface water pH standard violations.
3. Please explain how wastewater that exceeds pH of 9.0 s.u. will be prevented from discharging
from the facility. Describe who you have contacted with the Division of Energy Mining and
Land Resources regarding compliance with your Stormwater/Process Wastewater permit
(NCG 140000) and the discharge of water with pFl elevated beyond 9.0 s.u.
4. Detail how you have come into full compliance with the requirements of the Division of
Energy Mining and Land Resources.
5. Please provide stormwater pond monitoring results from January 1 2015 to the present date
and describe the location of the sampling point(s).
Environmental damage and violations of North Carolina Administrative Codes have been documented for
the subject site as stated above. Your efforts to undertake activities to bring the subject site back into

compliance is not an admission, rather it is an action that must be taken in order to begin to resolve
ongoing environmental issues.
These violations and any future violations are subject to a civil penalty assessment of up to a
maximum of 525,000.00 per day for each violation. Your response to this correspondence will be
considered in any civil penalty assessment process that may occur.
Should you have any questions regarding these matters, please contact Ray Milosh at [phone].
Siincerely, r
Danny Smith, � 2pervisor
Water Quality Regional Operations
Surface Water Protection Section
cc: RRO DWR Files
Central Files
John Holley — RRO DEMLR
Bradley Bennett — Stormwater Permitting Unit

PROCESS WASTEWATER — Quarterly Discharge Monitoring Report
GENERAL PERMIT No. NCG140000
CERTIFICATE OF COVERAGE NO. NCG140218
FACILITY NAME: _Thomas Concrete of Carolina- Durham Plant
PERSON COLLECTING SAMPLES: Susan Bostian
CERTIFIED LABQRATORY:_ESC Lab # ENV375_
March 2016 Lab #
LIMIT VIOLATIONS? YES ® NO ❑
Part A: Wastewater Monitoring Requirements
SAMPLE COLLECTION YEAR: 2016
SAMPLE QUARTER: ❑Jul -Sept ❑Oct -Dec ®Jan -March
COUNTY: Durham
PHONE NO. (_919 _)598-0456
ADD TO LISTSERVE? ❑YES ®NO EMAIL:
❑April -June
DISCHARGING TO CLASS: ❑SA ❑HQW ❑PNA ❑Trout ®Other.
OPTIONAL INFO:
Outfall No.
Date Sample
1
Collected
(mm/dd/yr)
Type of Wastewater
(VE, RM, MD)�
pH
(standard)
Total Suspended
Solids
(mg/L)
Settleable
Solids
(mL/L)
TPH usingDischarge
method 1664A
SGT-HEMS
(mg/L)
Duration
(minutes)
Total Flow
,
(gallons/day)
-
-
-
6-93.4
303s
53
(15)6
-
-
001
NO DISCHARGE
Total Flow:
4,790 gpd
RECEE
NED
MAY 1
Z016
CENTim
FILES
1 If wastewater systems have not discharged in this quarter — report "No Flow" or "No Discharge" here. Please make sure to mark the sample quarter above.
z Report the abbreviation for the type of Authorized Wastewater Discharges here: Vehicle and Equipment Cleaning (VE), Raw Material Stockpiles (RM), Mixing Drum
Cleanout (MD). Report more than one type if the waste -stream is commingled.
3 if an effluent limit is exceeded twice in a row, the permittee is required to institute monthly monitoring for that parameter for six months, unless DWQ RO staff
notifies you to continue monitoring.
4 pH limits are 6-9 S.U. for wastewater discharges to freshwaters, and 6.8-8.5 S.U. for discharges to saltwaters.
Permit Date:7/1/2010-06/30/2015
Last Revised 07/13/11
Page 1 of 2

s TSS limits are 20 mg/L for wastewater discharges to HQW waters, 10 mg/L for Trout and PNA waters, and 30 mg/L for all other water classifications.
6 Process wastewater discharges shall only be monitored for TPH when commingled with stormwater discharges from VMA areas. TPH does not have a limit for wastewater,
but instead is subject to benchmarks and provisions of Part IV, Section A, including the Tiered Response Action.
Flow rate can be measured continuously or calculated. Flow limits for wastewater discharges to HQW waters shall be set to 50% of the Summer 7Q10 Flow as per 15A
NCAC 02B .0224. Permittees who discharge wastewater to HQW waters shall obtain a Summer 7Q10 flow and report this information to DWQ. If the permittee cannot
obtain a Summer 7Q10 flow for the receiving waters at the discharge location, the permittee shall notify DWQ, and the DWQ Regional Office may require an annual flow
report on a case -by -case basis.
MAIL ORIGINAL AND ONE COPY OF THIS ANNUAL SUMMARY (INCLUDING ALL "NO FLOW", "NO DISCHARGE") WITHIN 30 DAYS OF RECEIPT OF SAMPLE (OR
AT END OF MONITORING PERIOD IN CASE OF "NO FLOW") TO: ^
Division of Water Quality
Attn: DWQ Central Files
1617 Mail Service Center
Raleigh, North Carolina 27699-1617
[phone]
YOU MUST SIGN THIS CERTIFICATION FOR ANY INFORMATION REPORTED:
"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
violations."
1:YaIII&
(Signature of Permittee)
Permit Date:7/1/2010-06/30/2015
4/30/2016
(Date)
Last Revised 07/13/11
Page 2 of 2

STORMWATER DISCHARGE OUTFALL (SDO) - Semi -Annual MONITORING FORM
GENERAL PERMIT NO. NCG140000
CERTIFICATE OF COVERAGE N0. NCG140218
FACILITY NAME: Thomas Concrete of Carolina -Durham Plant
PERSON COLLECTING SAMPLES Kevin Kelt
CERTIFIED LABORATORY ESC Lab # ENV 375_
Lab #
OPTIONAL INFO: July Monitoring event
Part A: Stormwater Monitoring Requirements
SAMPLE COLLECTION YEAR: 2016
SAMPLING PERIOD: ® July -December ❑ January -June
COUNTY Durham
PHONE NO. [phone]
ADD TO LISTSERVE? ❑YES ®NO EMAIL:
DISCHARGING TO CLASS: [:]SA ❑HQW ❑PNA ❑Trout ®Other,
Outfall No.
Date Sample
Collected
(mo/dd/yr OR
NO FLOW)1
pH
(Standard
Units)
TSS
(mg/L)
Event
Duration
(minutes)
Total 4
Rainfall
(in)
In Tier 2
Monthly
Monitoring?
(y/n)
# of Months in Tier
z
2 Sampling
-
-
6-9
100 .
-
-
-
-
001
NO FLOW
y
29
Rl=r.F=I\/Fr
AUG 19 Loll"
CE
NTRAL FILES
©
VR SECTION
1 If "NO FLOW" or "NO DISCHARGE, Enter "NO FLOW" or "NO DISCHARGE" for each outfall here. Please make sure to mark the sample period above.
2 If a value is in excess of the benchmark, or outside the benchmark range (for pH), you must implement the Tier 1 or Tier 2 responses in the General Permit. Tier 2
Monthly sampling shall be done until 3 consecutive samples are below the benchmark or within the benchmark range.
3 T5S benchmark values are 100 mg/l, except when discharging to ORW, HQW, Trout, and PNA waters where they are 50 mg/I.
Permit Date: 7/1/2011-60/30/2015 Last Revised 7/13/11
Page 1 of 2

Part B: Vehicle Maintenance Activity Monitoring Requirements for facilities using > 55 gal of new motor oil/month — averaged over a calendar year.
Outfall
No.
Date Sample
Collected
(mo/dd/yr)
pH
(Standard
Units)
TPH using method
1664ASGT-HEM
(mg/L)
Total Suspended
Solids
(mg/L)
Event
Duration
(minutes)
Total
a
Rainfall
(in)
New Motor Oil
Usage
(gal/month)
In Tier 2
Monthly
Monitoring?
(y/n)
tt of Months
in Tier 2
Sampling2
6-9
15
100 '
-
-
-
-
-
HAS YOUR FACILITY HAD 4 OR MORE BENCHMARK EXCEEDENCES AT ANY ONE OUTFALL (INCLUDING VEHICLE MAINTENANCE)? YES ❑ NO
HAVE YOU CONTACTED THE REGION? YES ❑ NO
REGIONAL OFFICE CONTACT NAME:
Mail Original and one coov of this DMR (including all "No Flow" & "No Discharge" reports) within 30 days of receipt of sample (or at end of monitoring period
in case of "No Flow") to:
Division of Water Quality
Attn: DWQCentraI Files
1617 Mail Service Center
Raleigh, North Carolina 27699-1617
YOU MUST SIGN THIS CERTIFICATION FOR ANY INFORMATION REPORTED:
"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 violations."
,-)aim, 2Gt"/ 8/16/2016
(Signature of Permittee) (Date)
Permit Date: 7/1/2011-60/30/2015
Last Revised 7/13/11
Page 3 of 2

STORMWATER DISCHARGE OUTFALL (SDO) - Semi -Annual MONITORING FORM
GENERAL PERMIT NO. NCG140000
CERTIFICATE OF COVERAGE NO. NCG140218
FACILITY NAME: Thomas Concrete of Carolina -Durham Plant
PERSON COLLECTING SAMPLES Kevin Kelt
CERTIFIED LABORATORY ESC Lab # ENV 375_
Lab #
OPTIONAL INFO: August Monitoring event
Part A: Stormwater Monitoring Requirements
SAMPLE COLLECTION YEAR: 2016
SAMPLING PERIOD: ® July -December ❑ January -June
COUNTY Durham
PHONE NO. [phone]
ADD TO LISTSERVE? ❑YES ®NO EMAIL:
DISCHARGING TO CLASS: ❑SA ❑HQW ❑PNA [-]Trout
®Other
Outfall No.
Date Sample
Collected
(mo/dd/yr OR
NO FLOW)1
pH
(;Standard
Units)
TSS
(mg/L)
Event
Duration
(minutes)
Total
Rainfall a
(in)
In Tier 2
Monthly
Monitoring?
(y/n)
# of Months in Tier
2 Samplingz
-
-
6-4
300 '
-
-
-
001
NO FLOW
_—
y
30
i
CENTR
kL HL -"
i1V`!!t Z:
' If "NO FLOW" or "NO DISCHARGE, Enter "NO FLOW" or "NO DISCHARGE" for each outfall here. Please make sure to mark the sample period above.
' If a value is in excess of the benchmark, or outside the benchmark range (for pH), you must implement the Tier 1 or Tier 2 responses in the General Permit. Tier 2
Monthly sampling shall be done until 3 consecutive samples are below the benchmark or within the benchmark range.
3 TS5 benchmark values are 100 mg/l, except when discharging to ORW, HOW, Trout, and PNA waters where they are 50 mg/I.
Permit Date: 7/1/2011-60/30/2015 Last Revised 7/13/11
Page 1 of 2

Part B: Vehicle Maintenance Activity Monitoring Requirements for facilities using > 55 gal of new motor oil/month — averaged over a calendar year.
Outfall
No.
Date Sample
Collected
(mo/dd/yr]1
pH
{Standard
Units}
TPH using method
1664A SGT-HEM
{mg/L}
Total Suspended
Solids
(mg/L)
Event
Duration
{minutes}
Total
,
Rainfall
(in)
New Motor Oil
Usage
(gal/month)
In Tier 2
Monthly
Monitoring?
(Y/n)
# of Months
in Tier 2
z
Sampling
6-9
15
100
HAS YOUR FACILITY HAD 4 OR MORE BENCHMARK EXCEEDENCES AT ANY ONE OUTFALL (INCLUDING VEHICLE MAINTENANCE)? YES ❑ NO 12
HAVE YOU CONTACTED THE REGION? YES ❑ NO
REGIONAL OFFICE CONTACT NAME:
Mail Original and one copy of this DMR (including all "No Flow" & "No Discharge" reports) within 30 days of receipt of sample for at end of monitoring period
in case of "No Flow") to:
Division of Water Quality
Attn: DWQ Central Files
1617 Mail Service Center
Raleigh, North Carolina 27699-1617
YOU MUST SIGN THIS CERTIFICATION FOR ANY INFORMATION REPORTED:
"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 violations."
9/12/2016
(Signature of Permittee) &I (Date)
Permit Date: 7/1/2011-60/30/2015
Last Revised 7/13/11
Page 3 of 2

S
PROCESS WASTEWATER -- Quarterly Discharge Monitoring Report
GENERAL PERMIT NO. NCG140000
CERTIFICATE OF COVERAGE NO. NCG140218
FACILITY NAME: _Thomas Concrete of Carolina- Durham Plant
PERSON COLLECTING SAMPLES: Susan Bostian
CERTIFIED LABORATORY: ES Lab # ENV375
Q4 Lab #
LIMIT VIOLATIONS? YES ® NO ❑
Part A: Wastewater Monitorine Requirements
SAMPLE COLLECTION YEAR: 2016
SAMPLE QUARTER: ❑Jul -Sept ®Oct -Dec Dian -March ❑April -June
COUNTY: Durham
PHONE NO. (_919 _)598-0456
ADD TO LISTSERVE? [—]YES ®NO EMAIL:
DISCHARGING TO CLASS: ❑SA ❑HQW ❑PNA ❑Trout ®Other
OPTIONAL INFO:
Outfall No.
Date Sample
1
Collected
(mm/dd/yr)
Type of Wastewater
�
(VE, RM, MID)'
pH
(standard)
Total Suspended
Solids
(mg/L)
Settleable
Solids
(mL/L)
TPH usingDischarge
method 1664A
SGT-HEM6
(mg/L)
Duration
(minutes)
Total Flow
(gallons/day)'
-
-
-
6-93'4
303's
53
(15),
-
-
001
NO DISCHARGE
Total Flow:
4,790gpd
-7f
r
- t N k F;HL F i
•+r��
-Y
eN
L! . v v �
1 If wastewater systems have not discharged in this quarter— report "No Flow" or "No Discharge" here. Please make sure to mark the sample quarter above.
z Report the abbreviation for the type of Authorized Wastewater Discharges here: Vehicle and Equipment Cleaning (VE), Raw Material Stockpiles (RM), Mixing Drum
Cleanout (MD). Report more than one type if the waste -stream is commingled.
3 if an effluent limit is exceeded twice in a row, the permittee is required to institute monthly monitoring for that parameter for six months, unless DWQ RO staff
notifies you to continue monitoring.
Permit Date: 7/1/2010-06/30/2015 Last Revised 07/13/11
Page 1 of 2

pH limits are 6-9 S.U. for wastewater discharges to freshwaters, and 6.8-8.5 S.U. for discharges to saltwaters.
s TSS limits are 20 mg/L for wastewater discharges to HQW waters, 10 mg/L for Trout and PNA waters, and 30 mg/L for all other water classifications.
6 Process wastewater discharges shall only be monitored for TPH when commingled with stormwater discharges from VMA areas. TPH does not have a limit for wastewater,
but instead is subject to benchmarks and provisions of Part IV, Section A, including the Tiered Response Action.
Flow rate can be measured continuously or calculated. Flow limits for wastewater discharges to HQW waters shall be set to 50% of the Summer 7Q10 Flow as per 15A
NCAC 02B .0224. Permittees who discharge wastewater to HQW waters shall obtain a Summer 7Q10 flow and report this information to DWQ. If the permittee cannot
obtain a Summer 7Q10 flow for the receiving waters at the discharge location, the permittee shall notify DWQ, and the DWQ Regional Office may require an annual flow
report on a case -by -case basis.
MAIL ORIGINAL AND ONE COPY OF THIS ANNUAL SUMMARY (INCLUDING ALL "NO FLOW", "NO DISCHARGE") WITHIN 30 DAYS OF RECEIPT OF SAMPLE (OR
AT END OF MONITORING PERIOD IN CASE OF "NO FLOW") TO. -
Division of Water Quality
Attn. DWQ Central Files
1617 Mail Service Center
Raleigh, North Carolina 27699-1617
[phone]
YOU MUST SIGN THIS CERTIFICATION FOR ANY INFORMATION REPORTED:
"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
violations."
Permit Date: 7/1/2010-06/30/2015 Last Revised 07/13/11
Page 2 of 2

(Signature of Permittee)
12/31/2016
(Date)
Permit Date: 7/1/2010-06/30/2015 Last Revised 07/13/11
Page 3 of 2

PROCESS WASTEWATER — Quarterly Discharge Monitoring Report
GENERAL PERMIT NO. NCG140000
CERTIFICATE OF COVERAGE NO. NCG140218
FACILITY NAME: _Thomas Concrete of Carolina- Durham Plant
PERSON COLLECTING SAMPLES: Susan Bostian
CERTIFIED LABORATORY:_ESC Lab # ENV375_
September 2016 Lab #
LIMIT VIOLATIONS? YES ® NO ❑
Part A: Wastewater Monitorine Requirements
SAMPLE COLLECTION YEAR: 2016
SAMPLE QUARTER: ®Jul -Sept ❑Oct -Dec ❑Jan -March ❑April -June
COUNTY: Durham
PHONE NO. (_919 _) 598-0456
ADD TO LISTSERVE? []YES ®NO EMAIL:
DISCHARGING TO CLASS: ❑SA ❑HQW ❑PNA []Trout ®Other
OPTIONAL INFO:
Outfall No.
Date Sample
1
Collected
(mm/dd/yr)
Type of Wastewater
(VE, RM, MD)'
pH
(standard)
Total Suspended
Solids
(mg/L)
Settleable
Solids
(mL/L)
TPH usingDischarge
method 1664A
SGT-HEMS
(mg/L)
Duration
(minutes)
Total Flow
�
(gallons/day)
-
-
-
6-93'°
303 s
S3
(15)S
-
001
NO DISCHARGE
Total Flow:
4,790 gpd
is
\.✓ L..1 V�.•• r
17
CE
JTRAL FILLb
Ov
IR JCL iQ- N
1 If wastewater systems have not discharged in this quarter— report "No Flow" or "No Discharge" here. Please make sure to mark the sample quarter above.
Z Report the abbreviation for the type of Authorized Wastewater Discharges here: Vehicle and Equipment Cleaning (VE), Raw Material Stockpiles (RM), Mixing Drum
Cleanout (MD). Report more than one type if the waste -stream is commingled.
3 if an effluent limit is exceeded twice in a row, the permittee is required to institute monthly monitoring for that parameter for six months, unless DWQ RO staff
notifies you to continue monitoring.
Permit Date: 7/1/2010-06/30/2015 Last Revised 07/13/11
Page 1 of 2

" pH limits are 6-9 S.U. for wastewater discharges to freshwaters, and 6.8-8.5 S.U. for discharges to saltwaters.
5 TSS limits are 20 mg/L for wastewater discharges to HQW waters, 10 mg/L for Trout and PNA waters, and 30 mg/L for all other water classifications.
6 Process wastewater discharges shall only be monitored for TPH when commingled with stormwater discharges from VMA areas. TPH does not have a limit for wastewater,
but instead is subject to benchmarks and provisions of Part IV, Section A, including the Tiered Response Action.
7 Flow rate can be measured continuously or calculated. Flow limits for wastewater discharges to HQW waters shall be set to 50% of the Summer 7Q10 Flow as per 15A
NCAC 02B .0224. Permittees who discharge wastewater to HQW waters shall obtain a Summer 7Q10 flow and report this information to DWQ. If the permittee cannot
obtain a Summer 7Q10 flow for the receiving waters at the discharge location, the permittee shall notify DWQ, and the DWQ Regional Office may require an annual flow
report on a case -by -case basis.
MAIL ORIGINAL AND ONE COPY OF THIS ANNUAL SUMMARY (INCLUDING ALL "NO FLOW". "NO DISCHARGE-) WITHIN 30 DAYS OF RECEIPT OF SAMPLE (OR
AT END OF MONITORING PERIOD IN CASE OF "NO FLOW") TO:
Division of Water Quality
Attn: DWQ Central Files
1617 Mail Service Center
Raleigh, North Carolina 27699-1617
[phone]
YOU MUST SIGN THIS CERTIFICATION FOR ANY INFORMATION REPORTED:
"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
violations."
Permit Date: 7/1/2010-06/30/2015 Last Revised 07/13/11
Page 2 of 2

(Signature of
Permit Date:7/1/2010-06/30/2015
9/30/2016
(Date)
Last Revised 07/13/11
Page 3 of 2

PROCESS WASTEWATER — Quarterly Discharge Monitoring Report
GENERAL PERMIT No. NCG140000
CERTIFICATE OF COVERAGE NO. NCG140218
FACILITY NAME: _Thomas Concrete of Carolina- Durham Plant
PERSON COLLECTING SAMPLES: Susan Bostian
CERTIFIED LABORATORY: ESC Lab # ENV375
June 2016 Lab #
LIMIT VIOLATIONS? YES ® NO ❑
Part A: Wastewater Monitoring Requirements
SAMPLE COLLECTION YEAR: 2016
SAMPLE QUARTER: ❑Jul -Sept ❑Oct -Dec ❑Jan -March
COUNTY: Durham
PHONE NO. (_919 _)598-0456
ADD TO LISTSERVE? DYES ®NO EMAIL:
®April -June
DISCHARGING TO CLASS: ❑SA ❑HQW ❑PNA ❑Trout ®Other
OPTIONAL INFO:
Outfall No.
Date Sample
Collected
(mm/dd/yr)
Type of Wastewater
(VERMMD} z
, ,
pH
[standard}
Total Suspended
Solids
(mg/L)
Settleable
Solids
(mL/L)
TPH using
method 1664A
6
5G
/L)T-HEM
Img/L}
Discharge
Duration
(minutes)
Total Flow
7
(gallons/day}
-
-
-
6-93'4
303'S
53-
001
NO DISCHARGE
Total Flow:
4,790 gpd
C'FA1T
?Ai � FS
DVVR
SECTION
1 If wastewater systems have not discharged in this quarter— report "No Flow" or "No Discharge" here. Please make sure to mark the sample quarter above.
2 Report the abbreviation for the type of Authorized Wastewater Discharges here: Vehicle and Equipment Cleaning (VE), Raw Material Stockpiles (RM), Mixing Drum
Cleanout (MD). Report more than one type if the waste -stream is commingled.
3If an effluent limit is exceeded twice in a row, the permittee is required to institute monthly monitoring for that parameter for six months, unless DWQ RO staff
notifies you to continue monitoring.
Permit Date: 7/1/2010-06/30/2015 Last Revised 07/13/11
Page 1 of 2

4 pH limits are 6-9 S.U. for wastewater discharges to freshwaters, and 6.8-8.5 S.U. for discharges to saltwaters.
5 TSS limits are 20 mg/L for wastewater discharges to HQW waters, 10 mg/L for Trout and PNA waters, and 30 mg/L for all other water classifications.
6 Process wastewater discharges shall only be monitored for TPH when commingled with stormwater discharges from VMA areas. TPH does not have a limit for wastewater,
but instead is subject to benchmarks and provisions of Part IV, Section A, including the Tiered Response Action.
7 Flow rate can be measured continuously or calculated. Flow limits for wastewater discharges to HQW waters shall be set to 50% of the Summer 7Q10 Flow as per 15A
NCAC 02B .0224. Permittees who discharge wastewater to HQW waters shall obtain a Summer 7Q10 flow and report this information to DWQ. If the permittee cannot
obtain a Summer 7Q10 flow for the receiving waters at the discharge location, the permittee shall notify DWQ, and the DWQ Regional Office may require an annual flow
report on a case -by -case basis.
MAIL ORIGINAL AND ONE COPY OF THIS ANNUAL SUMMARY (INCLUDING ALL "NO FLOW", "NO DISCHARGE") WITHIN 30 DAYS OF RECEIPT OF SAMPLE (OR
AT END OF MONITORING PERIOD IN CASE OF "NO FLOW") TO:
Division of Water Quality
Attn: DWQ Central Files
1617 Mail Service Center
Raleigh, North Carolina 27699-1617
[phone]
YOU MUST SIGN THIS CERTIFICATION FOR ANY INFORMATION REPORTED:
"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
violations."
Permit Date:7/1/2010-06/30/2015
Last Revised 07/13/11
Page 2 of 2

jSignature of Permittee)
6/30/2016
(Date)
Permit Date: 7/1/2010-06/30/2015 Last Revised 07/13/11
Page 3 of 2

STORMWATER DISCHARGE OUTFALL (SDO) - Semi -Annual MONITORING FORM
GENERAL PERMIT NO. NCG140000
CERTIFICATE OF COVERAGE NO. NCG140218 SAMPLE COLLECTION YEAR: 2016
FACILITY NAME: Thomas Concrete of Carolina -Durham Plant SAMPLING PERIOD: ® July -December ❑ January -June
PERSON COLLECTING SAMPLES Kevin Kelt COUNTY Durham
CERTIFIED LABORATORY ESC Lab # ENV 375 PHONE NO. [phone]
Lab # ADD TO LISTSERVE? DYES ®NO EMAIL:
OPTIONAL INFO: November Monitoring event DISCHARGING TO CLASS: ❑SA ❑HQW ❑PNA [—]Trout ®Other
Part A: Stormwater Monitoring Requirements
Outfall No.
Date Sample
Collected
(mo/dd/yr OR
NO FLOW)1
PH
an
(Standard
Units)
TSS
(mg/L)
Event
Duration
(minutes)
Total 4
Rainfall
(in)
In Tier 2
Monthly
Monitoring?
(y/n)
# of Months in Tier
2 Sampling x
-
6-9
100 ,
-
-
-
-
001
NO FLOW
y
33
CFNTW
I Ell Eq
DWR S.
=CTION
' If "NO FLOW" or "NO DISCHARGE, Enter "NO FLOW" or "NO DISCHARGE" for each outfall here. Please make sure to mark the sample period above.
z If a value is in excess of the benchmark, or outside the benchmark range (for pH), you must implement the Tier 1 or Tier 2 responses in the General Permit. Tier 2
Monthly sampling shall be done until 3 consecutive samples are below the benchmark or within the benchmark range.
3 TSS benchmark values are 100 mg/I, except when discharging to ORW, HOW, Trout, and PNA waters where they are SO mg/l.
Permit Date: 7/1/2011-60/30/2015 Last Revised 7/13/11
Page 1 of 2

Part B: Vehicle Maintenance Activity Monitoring Requirements for facilities using > 55 gal of new motor oil/month — averaged over a calendar year.
Outfall
No.
Date Sample
Collected 1
(mo/dd/yr)
pH
(standard
Units)
TPH using method
1664A SGT-HEM
(mg/L)
Total Suspended
Solids
(mg/L)
Event
Duration
(minutes)
Total
a
Rainfall
(in)
New Motor Oil
Usage
(gal/month)
In Tier 2
Monthly
Monitoring?
(y/n)
# of Months
in Tier 2
Sampling2
6-9
15
100 '
-
-
-
-
-
HAS YOUR FACILITY HAD 4 OR MORE BENCHMARK EXCEEDENCES AT ANY ONE OUTFALL (INCLUDING VEHICLE MAINTENANCE)? YES ❑ NO
HAVE YOU CONTACTED THE REGION? YES ❑ NO
REGIONAL OFFICE CONTACT NAME:
Mail Original and one copy of this DMR (including all "No Flow" & "No Discharge" reports) within 30 days of receipt of sample (or at end of monitoring period
in case of "No Flow") to:
Division of Water Quality
Attn: DWQ Central Files
1617 Mail Service Center
Raleigh, North Carolina 27699-1617
YOU MUST SIGN THIS CERTIFICATION FOR ANY INFORMATION REPORTED:
"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.
am aware that there are significa penalties for submjtting false information, including the possibility of fines and imprisonment for knowing violations."
,:ya-m, 4 G?i/ 12/15/2016
(Signature of Permittee) (Date)
Permit Date: 7/1/2011-60/30/2015 Last Revised 7/13/11
Page 3 of 2

STORMWATER DISCHARGE OUTFALL (SDO) - Semi -Annual MONITORING FORM
GENERAL PERMIT NO. NCG140000
CERTIFICATE OF COVERAGE NO. NCG 140218
FACILITY NAME: Thomas Concrete of Carolina -Durham Plant
PERSON COLLECTING SAMPLES Kevin Kelt
CERTIFIED LABORATORY ESC Lab # ENV 375�
Lab #
OPTIONAL INFO: March Monitoring event
Part A: Stormwater Monitoring Requirements
SAMPLE COLLECTION YEAR: 2016
SAMPLING PERIOD: ❑ July -December ® January -June
COUNTY Durham
PHONE NO. [phone]
ADD TO LISTSERVE? []YES ®NO EMAIL:
DISCHARGING TO CLASS: ❑SA ❑HQW ❑PNA ❑Trout
RECEIVED
APR l I Z016
CENTRAL FILES
DWR SECTION
®Other
Outfall No.
Date Sample
Collected
(mo/dd/yr OR
NO FLOW)'
pH
(standard
Units)
TSS
(mg/L)
Event
Duration
(minutes)
Total
4
Rainfall
{in)
In Tier 2
Monthly
Monitoring?
(y/n)
# of Months in Tier
2
2 Sampling
-
-
6-92
1002,
-
-
-
-
001
No Discharge
y
25
' If "NO FLOW" or "NO DISCHARGE, Enter "NO FLOW" or "NO DISCHARGE" for each outfall here. Please make sure to mark the sample period above.
2 If a value is in excess of the benchmark, or outside the benchmark range (for pH), you must implement the Tier 1 or Tier 2 responses in the General Permit. Tier 2
Monthly sampling shall be done until 3 consecutive samples are below the benchmark or within the benchmark range.
3 TSS benchmark values are 100 mg/I, except when discharging to ORW, HQW, Trout, and PNA waters where they are SO mg/I.
4 For each sampled measurable storm event the total precipitation must be recorded using data from an on -site rain gauge.
Permit Date: 7/1/2011-60/30/2015 Last Revised 7/13/11
Page 1 of 2

Part B: Vehicle Maintenance Activity Monitoring Requirements for facilities using > 55 gal of new motor oil/month — averaged over a calendar year.
Outfall
No.
Date Sample
Collected 1
(mo/dd/yr)
pH
(Standard
Units)
TPH using method
1664A SGT--HEM
(mg/L)
Total Suspended
Solids
(mg/L)
Event
Duration
(minutes)
Total
a
Rainfall
(in)
New Motor Oil
Usage
(gal/month)
In Tier 2
Monthly
Monitoring?
(y/n)
# of Months
in Tier 2
Sampling2
6-92
15
100 '
-
-
-
-
-
HAS YOUR FACILITY HAD 4 OR MORE BENCHMARK EXCEEDENCES AT ANYONE OUTFALL (INCLUDING VEHICLE MAINTENANCE)? YES ❑ NO
HAVE YOU CONTACTED THE REGION? YES ❑ NO
REGIONAL OFFICE CONTACT NAME:
Mail Qriainal and one coov of this DMR (includina all "No Flow" & "No Discharae" reports) within 30 days of receipt of samDle for at end of monitoring Deriod
in case of "No Flow" to:
Division of Water Quality
Attn: DWQ Central Files
1617 Mail Service Center
Raleigh, North Carolina 27699-1617
YOU MUST SIGN THIS CERTIFICATION FOR ANY INFORMATION REPORTED:
"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.
am aware that there are signif' ant penalties for sgbmitting false information, including the possibility of fines and imprisonment for knowing violations."
,5a-ii'& _ 2� �. , 4/4/2016
(Signature of Permittee) v (Date)
Permit Date: 7/1/2011-60/30/2015 Last Revised 7/13/11
Page 2 of 2

STORMWATER DISCHARGE OUTFALL (SDO) - Semi -Annual MONITORING FORM
GENERAL PERMIT No. NC6140000
CERTIFICATE OF COVERAGE NO. NCG140218
FACILITY NAME: Thomas Concrete of Carolina -Durham Plant
PERSON COLLECTING SAMPLES Kevin Kelt
CERTIFIED LABORATORY ESC Lab # ENV 375_
Lab #
OPTIONAL INFO: April Monitoring event
Part A: Stormwater Monitoring Requirements
SAMPLE COLLECTION YEAR: 2016
SAMPLING PERIOD: ❑ July -December ® January -June
COUNTY Durham
PHONE NO. [phone]
ADD TO LISTSERVE? ❑YES ®NO EMAIL:
DISCHARGING TO CLASS: ❑SA ❑HQW ❑PNA ❑Trout ®Other,
Outfall No.
Date Sample
Collected
(mo/dd/yr OR
NO FLOW)'
pH
(Standard
Units]
TSS
(mg/L)
Event
Duration
(minutes]
Total
a
Rainfall
(in)
In Tier 2
Monthly
Monitoring?
(y/n)
# of Months in Tier
2
2 Sampling
-
-
6-92
1002,3
-
-
-
-
001
No Discharge
y
26
ECERIED
CENTRAL
FILES
1 If "NO FLOW" or "NO DISCHARGE, Enter "NO FLOW" or "NO DISCHARGE" for each outfall here. Please make sure to mark the sample period above.
Z If a value is in excess of the benchmark, or outside the benchmark range (for pH), you must implement the Tier 1 or Tier 2 responses in the General Permit. Tier 2
Monthly sampling shall be done until 3 consecutive samples are below the benchmark or within the benchmark range.
3 TSS benchmark values are 100 mg/I, except when discharging to ORW, HQW, Trout, and PNA waters where they are 50 mg/I.
For each sampled measurable storm event the total precipitation must be recorded using data from an on -site rain gauge.
Permit Date: 7/1/2011-60/30/2015 Last Revised 7/13/11
Page 1 of 2

Part B: Vehicle Maintenance Activity Monitoring Requirements for facilities using > 55 gal of new motor oil/month — averaged over a calendar year.
Outfall
No.
Date Sample
Collected 1
(mo/dd/yr)
PH
(Standard
Units)
TPH using method
1664A 5GT-HEM
(mg/L)
Total Suspended
Solids
(mg/L)
Event
Duration
(minutes)
Total
a
Rainfall
(in)
New Motor Oil
Usage
(gal/month)
In Tier 2
Monthly
Monitoring?
(y/n)
#a! of Months
in Tier 2
Sampling2
6-9
15
100 ,
-
-
-
-
-
HAS YOUR FACILITY HAD 4 OR MORE BENCHMARK EXCEEDENCES AT ANY ONE OUTFALL (INCLUDING VEHICLE MAINTENANCE)? YES ❑ NO
HAVE YOU CONTACTED THE REGION?' ;: 'YES. ❑ NO
REGIONAL OFFICE CONTACT NAME:
Mail Original and one copy of this DMR'fincludine all "No Flow" & "No Discharge" reports) within 30 days of receipt of sample (or at end of monitoring period
in case of "No Flow") to:
Division of Water Quality
Attn: DWQ Central Files
1617 Mail Service Center
Raleigh, North Carolina 27699-1617
YOU MUST SIGN THIS CERTIFICATION FOR ANY INFORMATION REPORTED:
"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.
am aware that there are si
1:5"Hl
(Signature of Permittee)
penalties for submitting false information, including the possibility of fines and imprisonment for knowing violations."
5/31/2016
(Date)
Permit Date. 7/1/2011-60/30/2015
Last Revised 7/13/11
Page 2 of 2

.;r
STORMWATER DISCHARGE OUTFALL (SDO) - Semi -Annual MONITORING FORM
GENERAL PERMIT NO. NCG140000
CERTIFICATE OF COVERAGE NO. NCG14O218
FACILITY NAME: Thomas Concrete of Carolina -Durham Plant
PERSON COLLECTING SAMPLES Kevin Kelt
CERTIFIED LABORATORY ESC Lab # ENV 375�
Lab #
OPTIONAL INFO: June Monitoring event
Part A: Stormwater Monitoring Requirements
SAMPLE COLLECTION YEAR: 2016 dM
11
SAMPLING PERIOD: ❑ July -December ® January -June is
COUNTY Durham
PHONE NO. (919) S98-0456
ADD TO LISTSERVE? []YES ®NO EMAIL:
DISCHARGING TO CLASS: []SA ❑HQW ❑PNA❑s Trout ®Other
rr�
Outfall No.
Date Sample
Collected
(mo/dd/yr OR
NO FL0W)1
PH
(Standard
Units)
TSS
(mg/L�
Event
Duration
(minutes)
Total
a
Rainfall
(in)
In Tier 2
Monthly��r' I'r#
Monitoring?
iY/�"
of Months in Tier
2
2 Sampling
-
6-9
100 .
-
-
-
-
001
6/28/2016
11.35
58.8
120
1.165
y
28
C.
r1
9ifED
9 Z016
- FILES
CTIOR,
' If "NO FLOW" or "NO DISCHARGE, Enter "NO FLOW" or "NO DISCHARGE" for each outfall here. Please make sure to mark the sample period above.
2 If a value is in excess of the benchmark, or outside the benchmark range (for pH), you must implement the Tier 1 or Tier 2 responses in the General Permit. Tier 2
Monthly sampling shall be done until 3 consecutive samples are below the benchmark or within the benchmark range.
3 TSS benchmark values are 100 mg/I, except when discharging to ORW, HQW, Trout, and PNA waters where they are 50 mg/I.
4 For each sampled measurable storm event the total precipitation must be recorded using data from an on -site rain gauge.
Permit Date: 7/1/2011-60/30/2015 Last Revised 7/13/11
Page 1 of 2

Part B: Vehicle Maintenance Activity Monitoring Requirements for facilities using > 55 gal of new motor oil/month — averaged over a calendar year.
Outfall
No.
Date Sample
Collected
(mo/dd/yr}i
PH
{Standard
Units}
TPH using method
1664A SGT-HEM
(mg/L)
Total Suspended
Solids
(mg/L)
Event
Duration
(minutes)
Total
a
Rainfall
(in)
New Motor Oil
Usage
(gal/month)
In Tier Z
Monthly
Monitoring?
(y/n)
# of Months
in Tier 2
2
Sampling
6-9
15
100 '
-
-
-
-
-
HAS YOUR FACILITY HAD 4 OR MORE BENCHMARK EXCEEDENCES AT ANY ONE OUTFALL (INCLUDING VEHICLE MAINTENANCE)? YES ❑ NO
HAVE YOU CONTACTED THE REGION? YES ❑ NO
REGIONAL OFFICE CONTACT NAME:
Mail Orieinal and one coov of this DMR (includine all "No Flow" & "No DischarPe" reports) within 30 days�of receipt of sample (or at end of monitorine period
in case of "No Flow") to:
Division of Water Quality
Attn: DWQ Central Files
1617 Mail Service Center
Raleigh, North Carolina 27699-1617
YOU MUST SIGN THIS CERTIFICATION FOR ANY INFORMATION REPORTED:
"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 violations."
{Signature of Permittee}
Permit Date: 7/1/2011-60/30/2015
7/13/2016
(Date)
Last Revised 7/13/11
Page 2 of 2

AG"A
NCDENR
Stormwater Discharge Outfall (SDO)
Qualitative Monitoring Report
Forguidance on filling out this form, please visit:
Permit No.: N/C/_/�/_/`/_/_/_/ or Certificate of Coverage No.:
Facility Name: Thomas Concrete of Carolina -Durham Plant
County: Durham Phone No. [phone]
Inspector: Kevin Kelt
Date of Inspection: 06/28/2016
Time of Inspection: 1425
Total Event Precipitation (inches): _1.165"
Was this a "Representative Storm Event" or "Measureable Storm Event" as defined by the permit?
(See information below.)
® Yes ❑ No
Please verify whether Qualitative Monitoring must be performed during a "representative storm
event" or "measureable storm event" (requirements vary, depending on the permit).
Qualitative monitoring requirements vary. Most permits require qualitative monitoring to be
performed during a "representative storm event" or during a "measureable storm event." However,
some permits do not have this requirement. Please refer to these definitions, if applicable.
A "representative storm event" is a storm event that measures greater than 0.1 inches of rainfall
and that is preceded by at least 72 hours (3 days) 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.
A "measurable storm event" is a storm event that results in an actual discharge from the
permitted site outfall. The previous measurable storm event must have been at least 72 hours
prior. The 72-hour storm interval does not apply if the permittee is able to document that a shorter
interval is representative for local storm events during the sampling period, and the permittee
obtains approval from the local DWQ Regional Office.
By this signature, I certify that this report is accurate and complete to the best of my knowledge:
(Signature of Pe
or Designee)
Page 1 of 2
SM-242, Last modified 7/31/2013

1. Outfall Description:
Outfall No. 01 Structure (pipe, ditch, etc.) Weir Outlet
Receiving Stream: Third Fork Creek Branch
Describe the industrial activities that occur within the outfall drainage area: Bulk storage
of raw materials, vehicle transport, wastewater treatment.
2. Color: Describe the color of the discharge using basic colors (red, brown, blue, etc.) and tint
(light, medium, dark) as descriptors: very light brown / ellow tint _
3. Odor: Describe any distinct odors that the discharge may have (i.e., smells strongly of oil,
weak chlorine odor, etc.): No distinct odor _
4. Clarity: Choose the number which best describes the clarity of the discharge, where 1 is
clear and 5 is very cloudy:
1 2 3 4 5
S. Floating Solids: Choose the number which best describes the amount of floating solids in
the stormwater discharge, where 1 is no solids and 5 is the surface covered with floating solids:
1 2 3 4 5
6. Suspended Solids: Choose the number which best describes the amount of suspended
solids in the stormwater discharge, where 1 is no solids and 5 is extremely muddy:
1 2 3 4 5
7. Is there any foam in the stormwater discharge? Yes No
S. Is there an oil sheen in the stormwater discharge? Yes No
9. Is there evidence of erosion or deposition at the outfall? Yes No
10. Other Obvious Indicators of Stormwater Pollution:
List and describe pH: 11.35
Note: Low clarity, high solids, and/or the presence of foam, oil sheen, or erosion/deposition
may be indicative of pollutant exposure. These conditions warrant further investigation.
Page 2 of 2
5wU-242, Last modified 7/31/2013

STORMWATER DISCHARGE OUTFALL (SDO) - Semi -Annual MONITORING FORM
GENERAL PERMIT NO. NCG140000 R9:(/7 a:[V
CERTIFICATE OF COVERAGE NO. NCG140218
FACILITY NAME: Thomas Concrete of Carolina -Durham Plant
PERSON COLLECTING SAMPLES Kevin Kelt
CERTIFIED LABORATORY ESC Lab # ENV 375Y
Lab #
OPTIONAL INFO: May Monitoring event
Part A: Stormwater Monitoring Requirements
K
�Li
T 4 2016
SAMPLE COLLECTION YEAR: 2016
SAMPLING PERIOD: ❑ July -December Z January-June1'�N I RAL FILE;
COUNTY Durham /f fJWR $CiI4N
PHONE NO. [phone]
ADD TO LISTSERVE? DYES ®NO EMAIL: �V/
DISCHARGING TO CLASS: ❑SA ❑HQW ❑PNA ❑Trout ®Other
Outfafl No.
Date Sample
Collected
(mo/dd/yr OR
NO FLOW)1
pH
(Standard
Units)
TSS
(mg/L)
Event
Duration
(minutes)
Total
4
Rainfall
(in)
In Tier 2
Monthly
Monitoring?
(y/n)
# of Months in Tier
z
2 Sampling
-
-
6-9
001
No Discharge
y
27 41�
I If "NO FLOW" or "NO DISCHARGE, Enter "NO FLOW" or "NO DISCHARGE" for each outfall here. Please make sure to mark the sample period above.
z If a value is in excess of the benchmark, or outside the benchmark range (for pH), you must implement the Tier 1 or Tier 2 responses in the General Permit. Tier 2
Monthly sampling shall be done until 3 consecutive samples are below the benchmark or within the benchmark range.
3TSS benchmark values are 100 mg/I, except when discharging to ORW, HQW, Trout, and PNA waters where they are 50 mg/l.
Permit Date: 7/1/2011-60/30/2015 Last Revised 7/13/11
Page 1 of 2

Part B: Vehicle Maintenance Activity Monitoring Requirements for facilities using > 55 gal of new motor oil/month — averaged over a calendar year.
outfall
No,
Date Sample
Collected
(mo/dd/yrjl
pH
(Standard
Units)
TPH using method
1664A SGT HEM
(mg/L)
Total Suspended
Solids
(mg/c)
Event
Duration
(minutes)
Total
a
Rainfall
(in)
New Motor oil
Usage
(gal/month)
In Tier 2
Monthly
Monitoring?
(y/n}
ii of Months
in Tier 2
2
Sampling
6-9
15
100 ,
-
-
-
-
-
HAS YOUR FACILITY HAD 4 OR MORE BENCHMARK EXCEEDENCES AT ANY ONE OUTFALL (INCLUDING VEHICLE MAINTENANCE)? YES ❑ NO
HAVE YOU CONTACTED THE REGION? YES ❑ NO
REGIONAL OFFICE CONTACT NAME:
Mail Original and one coov of this DMR (including all "No Flow" & "No Discharee" reports) within 30 days of receiot of samole (or at end of monitoring oeriod
in case of "No Flow') to:
Division of Water quality
Attn: DWQ Central Files
1617 Mail Service Center
Raleigh, North Carolina 27699-1617
YOU MUST SIGN THIS CERTIFICATION FOR ANY INFORMATION REPORTED:
"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.
am aware that there are s pificant penalties for submitting false information, including the possibility of fines and imprisonment for knowing violations."
cJ �ci'►7� 2 C.ri 6/7/2016
(Signature of Permittee) 61 (Date)
Permit Date: 7/1/2011-60/30/2015
Last Revised 7/13/11
Page 3 of 2

STORMWATER DISCHARGE OUTFALL (SDO) - Semi -Annual MONITORING FORM
GENERAL PERMIT NO. NCG140000
CERTIFICATE OF COVERAGE N0. NCG140218
FACILITY NAME: Thomas Concrete of Carolina -Durham Plant
PERSON COLLECTING SAMPLES Kevin Kelt
CERTIFIED LABORATORY ESC Lab # ENV 375_
Lab #
OPTIONAL INFO: Febrparq Monitoring event
Part A: Stormwater Monitoring Requirements
SAMPLE COLLECTION YEAR: 2016
SAMPLING PERIOD: ❑ July -December ® January -June
COUNTY Durham
PHONE NO. [phone]
ADD TO LISTSERVE? []YES ®NO EMAIL:
DISCHARGING TO CLASS: []SA ❑HQW ❑PNA []Trout ®Other.
Outfall No.
Date Sample
Collected
(mo/dd/yr OR
NO FLOW)1
pH
(standard
Units)
TSS
(mg/L)
Event
Duration
(minutes)
Total 4
Rainfall
(in)
In Tier 2
Monthly
Monitoring?
(y/n)
# of Months in Tier
:
2 Sampling
-
-
6-4
100 ,
-
-
-
-
001
No Discharge
y
23
If "NO FLOW" or "NO DISCHARGE, Enter "NO FLOW" or "NO DISCHARGE" for each outfall here. Please make sure to mark the sample period above.
z If a value is in excess of the benchmark, or outside the benchmark range (for pH), you must implement the Tier 1 or Tier 2 responses in the General Permit. Tier 2
Monthly sampling shall be done until 3 consecutive samples are below the benchmark or within the benchmark range.
3 TSS benchmark values are 100 mg/I, except when discharging to ORW, HQW, Trout, and PNA waters where they are 50 mg/I.
4 For each sampled measurable storm event the total precipitation must be recorded using data from an on -site rain gauge.
Permit Date: 7/1/2011-60/30/2015 Last Revised 7/13/11
Page 1 of 2

Part B: Vehicle Maintenance Activity Monitoring Requirements for facilities using > 55 gal of new motor oil/month — averaged over a calendar year.
Outfall
No.
Date Sample
Collected
(mo/dd/yr}�
PH
(standard
Units)
TPH using method
1664A SGT-HEM
(mg/L)
Total Suspended
Solids
(mg/L)
Event
Duration
{minutes}
Total
a
Rainfall
(in)
New Motor Oil
Usage
(gal/month)
In Tier 2
Monthly
Monitoring?
{y/n}
# of Months
in Tier 2
2
Sampling
6-9
15
100 ,
-
-
-
-
HAS YOUR FACILITY HAD 4 OR MORE BENCHMARK EXCEEDENCES AT ANYONE OUTFALL (INCLUDING VEHICLE MAINTENANCE)? YES ❑ NO
HAVE YOU CONTACTED THE REGION? YES ❑ NO
REGIONAL OFFICE CONTACT NAME:
Mail Orieinal and one coov of this DMR (includine all "No Flow" & "No Discharee" reports) within 30 days of receipt of sample for at end of monitorine period
in case of "No Flow") to:
Division of Water Quality
Attn: DWQ Central Files
1617 Mail Service Center
Raleigh, North Carolina 27699-1617
YOU MUST SIGN THIS CERTIFICATION FOR ANY INFORMATION REPORTED:
"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.
am aware that there are suZnificant penalties for submitting false information, including the possibility of fines and imprisonment for knowing violations."
Uz 2/29/2016
(Signature of Permittee) (Date)
Permit Date:7/1/2011-60/30/2015 Last Revised 7/13/11
Page 2 of 2

STORMWATER DISCHARGE OUTFALL (SDO) - Semi -Annual MONITORING FORM
GENERAL PERMIT NO. NCG140000
CERTIFICATE OF COVERAGE NO. NCG140218 SAMPLE COLLECTION YEAR: 2016
FACILITY -NAME: Thomas Concrete of Carolina -Durham Plant SAMPLING PERIOD: ❑ July -December ® January -June
PERSON COLLECTING SAMPLES Kevin Kelt COUNTY Durham
CERTIFIED LABORATORY ESC Lab # ENV 375_
Lab #
OPTIONAL INFO: February Monitoring event
Part A: Stormwater Monitoring Requirements
PHONE NO. [phone]
ADD TO LISTSERVE? []YES ®NO EMAIL:
DISCHARGING TO CLASS: []SA ❑HQW ❑PNA []Trout
®Other
Outfall No.
Date Sample
Collected
(mo/dd/yr OR
NO FLOW)
PH
(Standard
Units)
TSS
(mg/Lj
Event
Duration
(minutes)
Total
a
Ra infall
(in)
In Tier 2
Monthly
Monitoring.?
(y/n)
# of Months in Tier
z
2 Sampling
-
-
6-9
100 .
-
-
-
-
001
No Discharge
y
24
' If "NO FLOW" or "NO DISCHARGE, Enter "NO FLOW" or "NO DISCHARGE" for each outfall here. Please make sure to mark the sample period above.
2 If a value is in excess of the benchmark, or outside the benchmark range (for pH), you must implement the Tier 1 or Tier 2 responses in the General Permit. Tier 2
Monthly sampling shall be done until 3 consecutive samples are below the benchmark or within the benchmark range.
3 TSS benchmark values are 100 mg/l, except when discharging to ORW, HOW, Trout, and PNA waters where they are 50 mg/I.
For each sampled measurable storm event the total precipitation must be recorded using data from an on -site rain gauge.
Permit Date: 7/1/2011-60/30/2015 Last Revised 7/13/11
Page 1 of 2

Part B: Vehicle Maintenance Activity Monitoring Requirements for facilities using > SS gal of new motor oil/month — averaged over a calendar year.
Outfall
No.
Date Sample
Collected
(mo/dd/yr)'
pH
(Standard
Units)
TPH using method
1664A SGT-HEM
(mg/L)
Total Suspended
Solids
(mg/L)
Event
Duration
(minutes)
Total
Rainfalla
(in)
New Motor Oil
Usage
(gal/month)
In InTier#
2 Tier
Monthly
Monitoring?
(y/n)
of Months
in Tier 2
Samplingz
6-9
15
100 '
-
-
-
-
-
HAS YOUR FACILITY HAD 4 OR MORE BENCHMARK EXCEEDENCES AT ANY ONE OUTFALL (INCLUDING VEHICLE MAINTENANCE)? YES ❑ NO
HAVE YOU CONTACTED THE REGION? YES ❑ NO
REGIONAL OFFICE CONTACT NAME:
Mail Original and one eorw of this DMR (including all "No Flow" & "No Discharge" reports) within 30 days of receipt of sample (or at end of monitoring period
in case of "No Flow") to:
Division of Water Quality
Attn: DWQ Central Files
1617 Mail Service Center
Raleigh, North Carolina 27699-1617
YOU MUST SIGN THIS CERTIFICATION FOR ANY INFORMATION REPORTED:
"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
am aware tk there are ' nificant p alties r submitting false information, including the possibility of fines and imprisonment for knowing violations."
3/31/2016
(Signature of Permittee) 11, (Date)
Permit Date: 7/1/2011-60/30/2015 Last Revised 7/13/11
Page 2 of 2

PROCESS WASTEWATER — Quarterly Discharge Monitoring Report
GENERAL PERMIT No. NCG140000
CERTIFICATE OF COVERAGE NO. NCG14O218
FACILITY NAME: _Thomas Concrete of Carolina- Durham Plant
PERSON COLLECTING SAMPLES: Kevin Kelt
CERTIFIED LABORATORY:_ESC
Lab ## ENV375
December 2015_Lab ##
LIMIT VIOLATIONS? YES ® NO ❑
Part A: Wastewater Monitoring Requirements
SAMPLE COLLECTION YEAR: 2015
SAMPLE QUARTER: ❑Jul -Sept ®Oct -Dec ❑Jan-MarcF
COUNTY: Durham
PHONE NO. (_919 _)598-0456
ADD TO LISTSERVE? ❑YES ®NO EMAIL:
DISCHARGING TO CLASS: [_]SA ❑HQW ❑PNA ❑Trout
OPTIONAL INFO:
❑April -June
®Other
Outfall No.
Date Sample
1
Collected
(mm/dd/yr)
Type of Wastewater
z
(VE, RM, MD)
pH
(standard)
Total Suspended
Solids
(mg/L)
Settleable
Solids
(mL/L)
TPH usingDischarge
method 1664A
SGT-HEM" "
(mg/L)
Duration
(minutes)
Total Flow
(gallons/day)7
-
-
-
6-93,4
303,5
53-
001
12/17/15
VE, RM
10.02
219
<0.033
45
Total Flow:
4,790 gpd
1 If wastewater systems have not discharged in this quarter— report "No Flow" or "No Discharge" here. Please make sure to mark the sample quarter above.
z Report the abbreviation for the type of Authorized Wastewater Discharges here: Vehicle and Equipment Cleaning (VE), Raw Material Stockpiles (RM), Mixing Drum
Cleanout (MD). Report more than one type if the waste -stream is commingled.
3 if an effluent limit is exceeded twice in a row, the permittee is required to institute monthly monitoring for that parameter for six months, unless DWQ RO staff
notifies you to continue monitoring.
4 pH limits are 6-9 S.U. for wastewater discharges to freshwaters, and 6.8-8.5 S.U. for discharges to saitwaters.
Permit Date: 7/1/2010-06/30/2015
Last Revised 07/13/11
Page 1 of 2

5 TSS limits are 20 mg/L for wastewater discharges to HQW waters,10 mg/L for Trout and PNA waters, and 30 mg/L for all other water classifications.
6 Process wastewater discharges shall only be monitored for TPH when commingled with stormwater discharges from VIVA areas. TPH does not have a limit for wastewater,
but instead is subject to benchmarks and provisions of Part IV, Section A, including the Tiered Response Action.
Flow rate can be measured continuously or calculated. Flow limits for wastewater discharges to HQW waters shall be set to 50% of the Summer 7Q10 Flow as per 15A
NCAC 02B .0224. Permittees who discharge wastewater to HQW waters shall obtain a Summer 7Q10 flow and report this information to DWQ. If the permittee cannot
obtain a Summer 7Q10 flow for the receiving waters at the discharge location, the permittee shall notify DWQ, and the DWQ Regional Office may require an annual flow
report on a case -by -case basis.
MAIL ORIGINAL AND ONE COPY OF THIS ANNUAL SUMMARY INCLUDING ALL "NO FLOW" "NO DISCHARGE" WITHIN 30 DAYS OF RECEIPT OF SAMPLE OR
AT END OF MONITORING PERIOD IN CASE OF "NO FLOW") TO:
Division of Water Quality
Attn: DWQ Central Files
1617 Mail Service Center
Raleigh, North Carolina 27699-1617
[phone]
YOU MUST SIGN THIS CERTIFICATION FOR ANY INFORMATION REPORTED:
"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
violations."
�5a4wi
(Signature of Permittee)
Permit Date:7/1/2010-06/30/2015
1/31/2016
(Date)
Last Revised 07/13/11
Page 2 of 2

ST0RMWATER DISCHARGE OUTFALL (SDO) - Semi -Annual MONITORING FORM
GENERAL PERMIT NO. NCG140000
CERTIFICATE OF COVERAGE NO. NCG14O218
FACILITY NAME: Thomas Concrete of Carolina -Durham Plant
PERSON COLLECTING SAMPLES Kevin Kelt
CERTIFIED LABORATORY ESC Lab # ENV 375_
Lab #
OPTIONAL INFO: December Monitoring event
Part A: Stormwater Monitoring Requirements
SAMPLE COLLECTION YEAR: 2015
SAMPLING PERIOD: ® July -December ❑ January -June
COUNTY Durham
PHONE NO. [phone]
ADD TO LISTSERVE? OYES ®NO EMAIL:
DISCHARGING TO CLASS: ❑SA ❑HQW ❑PNA ❑Trout ®Other
Outfall No.
Date Sample
Collected
(mo/dd/yr OR
NO FL0W)'
pH
[Standard
Units]
TSS
(mg/L)
Event
Duration
(minutes]
Total
4
Rainfall
(in)
In Tier 2
Monthly
Monitoring?
(y/n)
# of Months in Tier
2 Samplingz
-
-
6-9
100 '
-
-
-
-
001
12/17/15
10.02
219.0
45
1.25
y
22
MAR
,-r
y R
' If "NO FLOW" or "NO DISCHARGE, Enter "NO FLOW" or "NO DISCHARGE" for each outfall here. Please make sure to mark the sample period above.
2 If a value is in excess of the benchmark, or outside the benchmark range (for pH), you must implement the Tier 1 or Tier 2 responses in the General Permit. Tier 2
Monthly sampling shall be done until 3 consecutive samples are below the benchmark or within the benchmark range.
3 TSS benchmark values are 100 mg/I, except when discharging to ORW, HQW, Trout, and PNA waters where they are 50 mg/I.
4 For each sampled measurable storm event the total precipitation must be recorded using data from an on -site rain gauge.
Nj
.�, F11.E5
ECT10N
Permit Date: 7/1/2011-60/30/2015 Last Revised 7/13/11
Page 1 of 2

Part B: Vehicle Maintenance Activity Monitoring Requirements for facilities using > 55 gal of new motor oil/month — averaged over a calendar year.
Outfall
No.
Date Sample
Collected
(mo/dd/yr)1
PH
(Standard
Units }
TPH using method
I664A SGT-HEM
m
[ g/L)
Total Suspended
Solids
m
( g/L)
Event
Duration
minutes
(minutes)
Total
a
Rainfall
in
( }
New Motor Oil
Usage
al month
(g / }
In Tier 2
Monthly
Monitoring?
(y/n)
tt of Months
in Tier 2
Sam lin Z
p g
6-9
15 2
100 '
-
-
-
-
t�
HAS YOUR FACILITY HAD 4 OR MORE BENCHMARK EXCEEDENCES AT ANY ONE OUTFALL (INCLUDING VEHICLE MAINTENANCE)? YES ❑ NO
HAVE YOU CONTACTED THE REGION? YES ❑ NO
REGIONAL OFFICE CONTACT NAME:
Mail Original and one copy of this DMR (includine all "No Flow" & "No Discharge" reports) within 30 days of receipt of sample (or at end of monitorinp, period
in case of "No Flow") to:
Division of Water Quality
Attn: DWQ Central Files
1617 Mail Service Center
Raleigh, North Carolina 27699-1617
YOU MUST SIGN THIS CERTIFICATION FOR ANY INFORMATION REPORTED:
"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 violations."
(Signature of Permittee)
1/31/2016
(Date)
Permit Date:7/1/2011-60/30/2015
Last Revised 7/13/11
Page 2 of 2

PROCESS WASTEWATER — Quarterly Discharge Monitoring Report
x
_ ` GENERAL PERMIT No. NCG140000
CERTIFICATE OF COVERAGE NO. NCG140218
FACILITY NAME: _Thomas Concrete of Carolina- Durham Plant
PERSON COLLECTING SAMPLES: Susan Bastian
CERTIFIED LABORATORY:_ESC Lab # ENV375_
August 2015 Lab #
LIMIT VIOLATIONS? YES ®NO ❑
Part A: Wastewater Monitoring Requirements
SAMPLE COLLECTION YEAR: 2015
SAMPLE QUARTER: ®Jul -Sept ❑Oct -Dec Dian -march
COUNTY: Durham
PHONE NO. (_919 _) 598-0456
ADD TO LISTSERVE? DYES ®NO EMAIL:
❑April -June=
�1112
moc
DISCHARGING TO CLASS: ❑SA ❑HQW ❑PNA [—]Trout ®Other
OPTIONAL INFO:
Outfall Na.
Date Sample
1
Collected
(mm/dd/yr)
Type of Wastewater
(VE, RM, MD)'
pH
(standard)
Total Suspended
Solids
(mg/L)
Settleable
Solids
(mL/L)
TPH usingDischarge
method 1664A
SGT-NFMs
(+erg/L)
Duration
(minutes)
Total Flow
7
(gallons/day)
-
-
-
6-93.4
303.5
53
(15)6
-
-
001
NO DISCHARGE
Total Flow:
4,790 gpd
flUFT
0 10i�1
D
FILh
two
I
1 If wastewater systems have not discharged in this quarter — report "No Flow" or "No Discharge" here. Please make sure to mark the sample quarter above.
Z Report the abbreviation for the type of Authorized Wastewater Discharges here: Vehicle and Equipment Cleaning (VE), Raw Material Stockpiles (RM), Mixing Drum
Cleanout (MD). Report more than one type if the waste -stream is commingled.
3 If an effluent limit is exceeded twice in a row, the permittee is required to institute monthly monitoring for that parameter for six months, unless DWQ RO staff
notifies you to continue monitoring.
4 pH limits are 6-9 S.U. for wastewater discharges to freshwaters, and 6.8-8.5 S.U. for discharges to saltwaters.
Permit Date:7/1/2010-06/30/2015
Last Revised 07/13/11
Page 1 of 2

5 TSS limits are 20 mg/L for wastewater discharges to HQW waters, 10 mg/L for Trout and PNA waters, and 30 mg/L for all other water classifications.
6 Proia"', wastewater discharges shall only be monitored for TPH when commingled with stormwater discharges from VMA areas. TPH does not have a limit for wastewater,
rout instead is subject to benchmarks and provisions of Part IV, Section A, including the Tiered Response Action.
Flow rate can be measured continuously or calculated. Flow limits for wastewater discharges to HQW waters shall be set to 50% of the Summer 7Q10 Flow as per 15A
NCAC 02B .0224. Permittees who discharge wastewater to HQW waters shall obtain a Summer 7Q10 flow and report this information to DWQ. If the permittee cannot
obtain a Summer 7Q10 flow for the receiving waters at the discharge location, the permittee shall notify DWQ, and the DWQ Regional Office may require an annual flow
report on a case -by -case basis.
MAIL ORIGINAL AND ONE COPY OF THIS ANNUAL SUMMARY (INCLUDING ALL "NO FLOW". "NO DISCHARGE") WITHIN 30 DAYS OF RECEIPT OF SAMPLE (OR
AT END OF MONITORING PERIOD IN CASE OF "NO FLOW") TO:
Division of Water Quality
Attn: DWQ Central Files
1617 Mail Service Center
Raleigh, North Carolina 27699-1617
[phone]
YOU MUST SIGN THIS CERTIFICATION FOR ANY INFORMATION REPORTED:
"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
violations."
(Signature of Permittee)
Permit Date:7/1/2010-06/30/2015
10/30/2015
(Date)
Last Revised 07/13/11
Page 2 of 2

STORMWATER DISCHARGE OUTFALL (SDO) - Semi -Annual MONITORING FORM
GENERAL PERMIT NO. NCG140000
CERTIFICATE OF COVERAGE N0. NCG140218
FACILITY NAME: Thomas Concrete of Carolina -Durham Plant
PERSON COLLECTING SAMPLES Kevin Kelt
CERTIFIED LABORATORY ESC Lab # ENV 375_
Lab #
OPTIONAL INFO: November Monitoring event
Part A: Stormwater Monitoring Requirements
SAMPLE COLLECTION YEAR: 2015
SAMPLING PERIOD: ® July -December ❑ January -June
COUNTY Durham
PHONE NO. [phone]
ADD TO LISTSERVE? []YES ®NO EMAIL:
DISCHARGING TO CLASS: []SA ❑HQW ❑PNA ❑Trout
MMUME
®Other-s"
Outfall No.
Date Sample
Collected
(mo/dd/yr OR
NO FLOW)'
pH
(Standard
Units}
TSS
(mg/L)
Event
Duration
{minutes]
Total
n
Rainfall
{in}
In Tier 2
Monthly
Monitoring?
{y/n}
# of Months in Tier
2 Sampling2
-
-
6-9
100 '3
-
-
-
-
001
11/09/15
9.75
51.6
45
1.25
y
21
1I
—TkLJ LZ I I
L_
JAN 0 4
.016
• i� r
u
v i -�
mAIR a r-
inN
1 If "NO FLOW" or "NO DISCHARGE, Enter "NO FLOW" or "NO DISCHARGE" for each outfall here. Please make sure to mark the sample period above.
2 If a value is in excess of the benchmark, or outside the benchmark range (for pH), you must implement the Tier 1 or Tier 2 responses in the General Permit. Tier 2
Monthly sampling shall be done until 3 consecutive samples are below the benchmark or within the benchmark range.
3 TSS benchmark values are 100 mg/I, except when discharging to ORW, HQW, Trout, and PNA waters where they are 50 mg/I.
"For each sampled measurable storm event the total precipitation must be recorded using data from an on -site rain gauge.
M=
—44
Permit Date: 7/1/2011-60/30/2015 Last Revised 7/13/11
Page 1 of 2

Part B: Vehicle Maintenance Activity Monitoring Requirements for facilities using > 55 gal of new motor oil/month — averaged over a calendar year.
Outfall
No.
Date Sample
Collected
(mo/dd/yr}1
pH
(Standard
Units)
TPH using method
I664A 5GT-HEM
(mg/L)
Total Suspended
Solids
(mg/L)
Event
Duration
(minutes)
Total
Rainfall°
(in)
New Motor Oil
Usage
(gal/month)
In Tier 2
Monthly
Monitoring?
(y/n'
# of Months
in Tier 2
2
Sampling
6-9
15
100 '
-
-
-
-
-
HAS YOUR FACILITY HAD 4 OR MORE BENCHMARK EXCEEDENCES AT ANYONE OUTFALL (INCLUDING VEHICLE MAINTENANCE)? YES ❑ NO
HAVE YOU CONTACTED THE REGION? YES ❑ NO
REGIONAL OFFICE CONTACT NAME:
Mail Original and one coov of this DMR (including all "No Flow" & "No Discharge" reports) within 30 days of receipt of sample (or at end of monitoring period
in case of "No Flow") to:
Division of Water Quality
Attn: DWQ Central Files '
1617 Mail Service Center
Raleigh, North Carolina 27699-1617
YOU MUST SIGN THIS CERTIFICATION FOR ANY INFORMATION REPORTED.
"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.
am aware that therpKe significant pe ltties for submitting false information, including the possibility of fines and imprisonment for knowing violations."
12/28/2015
(Signature of Permittee) (Date)
Permit Date: 7/1/2011-60/30/2015 Last Revised 7/13/11
Page 2 of 2

PROCESS WASTEWATER — Quarterly Discharge Monitoring Report
GENERAL PERMIT NO. NCG140000
CERTIFICATE OF COVERAGE NO. NCG140218
FACILITY NAME: _Thomas Concrete of Carolina- Durham Plant
PERSON COLLECTING SAMPLES: Kevin Kelt
CERTIFIED LAI30RATORY:_ESC Lab # ENV375.
Lab h
LIMIT VIOLATIONS? YES ® NO ❑
Part A: Wastewater Monitoring Requirements
M "I
SAMPLE COLLECTION YEAR: 2015
SAMPLE QUARTER: []Jul -Sept ®Oct -Dec ❑Jan -March ❑April -June Ii
COUNTY: Durham C+3
PHONE NO. (_919 _) 598-0456
ADD TO LISTSERVE? ❑YES ®NO EMAIL: w 01
DISCHARGING TO CLASS: ❑SA ❑HQW ❑PNA []Trout ®Other =111111C
OPTIONAL INFO:
Outfall No.
Date Sample
3
Collected
(mm/dd/yr)
Type of Wastewater
(VE, RM, MD)z
pH
(standard)
Total Suspended
Solids
(mg/L)
Settleable
Solids
(mL/L)
TPH usingDischarge
method 1664R
SGT NEA4'
(mg/L)
Duration
(minutes)
Total Flow
(gallons/day)
-
-
-
6-93,4
103,5
S3
(15)6
-
-
001
11/09/15
VE, RM
9.75
51.6
c0.003
Total Flow:
4,790 gpd
REGEVtu
JAI 0 ,E
LCfr + I
.n
��-
r
1 If wastewater systems have not discharged in this quarter— report "No Flow" or "No Discharge" here. Please make sure to mark the sample quarter above.
2 Report the abbreviation for the type of Authorized Wastewater Discharges here: Vehicle and Equipment Cleaning (VE), Raw Material Stockpiles (RM), Mixing Drum
Cleanout (MD). Report more than one type if the waste -stream is commingled.
3If an effluent limit is exceeded twice in a row, the permittee is required to institute monthly monitoring for that parameter for six months, unless DWQ RO staff
notifies you to continue monitoring.
° pH limits are 6-9 S.U. for wastewater discharges to freshwaters, and 6.8-8.5 S.U. for discharges to saltwaters.
Permit Date: 7/1/2010-06/30/2015 Last Revised 07/13/11
Page 1 of 2

5 TSS limits are 20 mg/L for wastewater discharges to HQW waters, 10 mg/L for Trout and PNA waters, and 30 rng/L for all other water classifications.
e Process wastewater discharges shall only be monitored for TPH when commingled with stormwater discharges from VMA areas. TPH does not have a limit for wastewater,
but instead is subject to benchmarks and provisions of Part IV, Section A, including the Tiered Response Action.
7 Flow rate can be measured continuously or calculated. Flow limits for wastewater discharges to HQW waters shall be set to 50% of the Summer 7Q10 Flow as per 15A
NCAC 02B .0224. Permittees who discharge wastewater to HQW waters shall obtain a Summer 7Q10 flow and report this information to DWQ. If the permittee cannot
obtain a Summer 7Q10 flow for the receiving waters at the discharge location, the permittee shall notify DWQ, and the DWQ Regional Office may require an annual flow
report on a case -by -case basis.
MAIL ORIGINAL AND ONE COPY OF THIS ANNUAL SUMMARY (INCLUDING ALL "NO FLOW". "NO DISCHARGE") WITHIN 30 DAYS OF RECEIPT OF SAMPLE OR
AT END OF MONITORING PERIOD IN CASE OF "NO FLOW") TO:
Division of Water Quality
Attn: DWQ Central Files
1617 Mail Service Center
Raleigh, North Carolina 27699-1617
[phone]
YOU MUST SIGN THIS CERTIFICATION FOR ANY INFORMATION REPORTED:
"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
uinlatinne "
.G a
(Signature of Permittee)
Permit Date:7/1/2010-06/30/2015
12/28/2015
(Date)
Last Revised 07/13/11
Page 2 of 2
LA-2
L--1
e

PROCESS WASTEWATER -- Quarterly Discharge Monitoring Report
GENERAL PERMIT NO. NCG140000
CERTIFICATE OF COVERAGE NO. NCG140218
FACILITY NAME: _Thomas Concrete of Carolina- Durham Plant
PERSON COLLECTING SAMPLES: Kevin Kelt
CERTIFIED LABORATORY: ESC Lab # ENV375
Lab #
LIMIT VIOLATIONS? YES ®NO ❑
Part A: Wastewater Monitoring Requirements
SAMPLE COLLECTION YEAR: 2015
SAMPLE QUARTER: []Jul -Sept ®Oct -Dec ❑Jan -March ❑April -June
COUNTY: Durham
PHONE NO. (_919 _)598-0456
ADD TO LISTSERVE? ❑YES ®NO EMAIL:
DISCHARGING TO CLASS: []SA ❑HQW ❑PNA []Trout ®Other
OPTIONAL INFO:
Outfall No.
Date Sample
i
Collected
(mm/dd/yr)
Type of Wastewater
2
(VE, RM, MD)
pH
(standard)
Total Suspended
Solids
(mg/L)
Settleable
Solids
(mL/L)
TPH usingDischarge
method 1664A
5GT-HEM'
(mg/L)
Duration
(minutes)
Total Flow
(gallons/day),
-
-
-
6-93''
303's
53
(15)r,
-
-
001
10/28/15
VE, RM
9.04
49.3
<0.033
_
Total Flow:
4,790 gpd
ME
E j"�
1�
0 4 2116
1
M t I VML FTL
v
ES
iwl
1 If wastewater systems have not discharged in this quarter— report "No Flow" or "No Discharge" here. Please make sure to mark the sample quarter above.
2 Report the abbreviation for the type of Authorized Wastewater Discharges here: Vehicle and Equipment Cleaning (VE), Raw Material Stockpiles (RM), Mixing Drum
Cleanout (MD). Report more than one type if the waste -stream is commingled.
3If an effluent limit is exceeded twice in a row, the permittee is required to institute monthly monitoring for that parameter for six months, unless DWQ RO staff
notifies you to continue monitoring.
pH limits are 6-9 S.U. for wastewater discharges to freshwaters, and 6.8-8.5 S.U. for discharges to saltwaters.
Permit Date: 7/1/2010-06/30/2015 Last Revised 07/13/11
Page 1 of 2
COD
a
MOC

5 TSS limits are 20 mg/L for wastewater discharges to HQW waters, 10 mg/L for Trout and PNA waters, and 30 mg/L for all other water classifications.
6 Process wastewater discharges shall only be monitored for TPH when commingled with stormwater discharges from VMA areas. TPH does not have a limit for wastewater,
but instead is subject to benchmarks and provisions of Part IV, Section A, including the Tiered Response Action.
7 Flow rate can be measured continuously or calculated. Flow limits for wastewater discharges to HQW waters shall be set to 50% of the Summer 7Q10 Flow as per 15A
NCAC 02B .0224. Permittees who discharge wastewater to HQW waters shall obtain a Summer 7Q10 flow and report this information to DWQ. If the permittee cannot
obtain a Summer 7Q10 flow for the receiving waters at the discharge location, the permittee shall notify DWQ, and the DWQ Regional Office may require an annual flow
report on a case -by -case basis.
MAIL ORIGINAL AND ONE COPY OF THIS ANNUAL SUMMARY (INCLUDING ALL "NO FLOW", "NO DISCHARGE") WITHIN 30 DAYS OF RECEIPT_ OF SAMPLE (OR
AT END OF MONITORING PERIOD IN CASE OF "NO FLOW") TO:
Division of Water Quality
Attn: DWQ Central Files
1617 Mail Service Center
Raleigh, North Carolina 27699-1617
[phone]
YOU MUST SIGN THIS CERTIFICATION FOR ANY INFORMATION REPORTED:
"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
violations."
(Signature of Permittee)
Permit Date:7/1/2010-06/30/2015
12/28/2015
(Date)
Last Revised 07/13/11
Page 2 of 2

STORMWATER DISCHARGE OUTFALL (SDO) - Semi -Annual MONITORING FORM
GENERAL PERMIT NO. NCG140000
CERTIFICATE OF COVERAGE NO. NCG140218
FACILITY NAME: Thomas Concrete of Carolina -Durham Plant
PERSON COLLECTING SAMPLES Kevin Kelt
CERTIFIED LABORATORY ESC Lab # ENV 375_
Lab #
OPTIONAL INFO: October Monitoring event
Part A: Stormwater Monitoring Requirements
SAMPLE COLLECTION YEAR: 2015
SAMPLING PERIOD: ® July -December ❑ January -June
COUNTY Durham
PHONE NO. [phone]
ADD TO LISTSERVE? ❑YES ®NO EMAIL:
DISCHARGING TO CLASS: ❑SA ❑HOW ❑PNA ❑Trout ®Other,
Outfall No.
Date Sample
Collected
(mo/dd/yr OR
NO FLOW)1
pH
[Standard
Units)
TSS
(mg/L)
Event
Duration
(minutes)
Total
4
Rainfall
(in)
In Tier 2
Monthly
Monitoring?
(y/n)
# of Months in Tier
z
2 Sampling
-
-
6-92
100 ,3
-
-
-
-
001
10/28/15
9.04
49.3
45
0.46
y
20
.A
NTRAI FII-Fc;
U
NR SECTION
1 If "NO FLOW" or "NO DISCHARGE, Enter "NO FLOW" or "NO DISCHARGE" for each outfall here. Please make sure to mark the sample period above.
2 If a value is in excess of the benchmark, or outside the benchmark range (for pH), you must implement the Tier 1 or Tier 2 responses in the General Permit. Tier 2
Monthly sampling shall be done until 3 consecutive samples are below the benchmark or within the benchmark range.
3 TSS benchmark values are 100 mg/I, except when discharging to ORW, HQW, Trout, and PNA waters where they are 50 mg/i.
4 For each sampled measurable storm event the total precipitation must be recorded using data from an on -site rain gauge.
Permit Date: 7/1/2011-60/30/2015 Last Revised 7/13/11
Page 1 of 2
a""
r�
�1
C`3
co
ti

Part B: Vehicle Maintenance Activity Monitoring Requirements for facilities using > 55 gal of new motor oil/month — averaged over a calendar year.
Outfall
No.
Date Sam
Sample
p
Collected
(mo/dd/yr}1
pH
(Standard
Units)
TPH using method
1664A SGT-HEM
(mg/L)
Total Suspended
Solids
{mg/L}
Event
Duration
(minutes)
Total
Rainfall°
{in}
New Motor Oil
usage
(gal/month)
In Tier 2
Monthly
Monitoring?
(Y/n)
if of Months
in Tier 2
Z
Sampling
6-9
15
100 '
-
-
-
-
-
HAS YOUR FACILITY HAD a OR MORE BENCHMARK EXCEEDENCES AT ANYONE OUTFALL (INCLUDING VEHICLE MAINTENANCE)? YES ❑ NO
HAVE YOU CONTACTED THE REGION? YES ❑ NO
REGIONAL OFFICE CONTACT NAME:
Cn
C-!:;
Mail Original and one copv of this DMR (includine all "No Flow" & "No Discharge" reports) within 30 days of receipt of sample (or at end of monitoring period LAJ
in case of "No Flow") to: L.-
Division of Water Quality
Attn: DWQ Central Files
1617 Mail Service Center
Raleigh, North Carolina 27699-1617
YOU MUST SIGN THIS CERTIFICATION FOR ANY INFORMATION REPORTED:
"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.
am aware that they are significant pe allties)for submitting false information, including the possibility of fines and imprisonment for knowing violations."
�" 12/28/2015
(Signature of Permittee)
Permit Date:7/1/2011-60/30/2015
{Date}
Last Revised 7/13/11
Page 2 of 2

STORMWATER DISCHARGE OUTFALL (SDO) - Semi -Annual MONITORING FORM
GENERA! PERMIT NO. NCG140000
CERTIFICATE OF COVERAGE NO. NCG140218
FACILITY NAME: Thomas Concrete of Carolina -Durham Plant
PERSON COLLECTING SAMPLES Kevin Kelt
CERTIFIED LABORATORY ESC Lab # ENV 375_
Lab #
OPTIONAL INFO: September Monitoring event
Part A: Stormwater Monitoring Requirements
SAMPLE COLLECTION YEAR: 2015
SAMPLING PERIOD: ® July -December ❑ January -June
COUNTY Durham
PHONE NO. [phone]
ADD TO LISTSERVE? DYES ®NO EMAIL:
DISCHARGING TO CLASS: []SA ❑HQW ❑PNA ❑Trout
®Other *
�0
Tier a49C
Outfall No.
Date Sample
Collected
(mo/dd/yr OR
NO FLOW)1
pH
{Standard
Units)
TSS
(mg/L)
Event
Duration
(minutes)
Total 4
Rainfall
(in)
In Tier 2
Monthly
Monitoring?
(y/n)
# of Months in
2 SamplingZ
-
-
6-92
1002,3
001
9/25/15
9.14
28.8
45
0.125
y
19
1 If "NO FLOW" or "NO DISCHARGE, Enter "NO FLOW" or "NO DISCHARGE" for each outfall here. Please make sure to mark the sample period above.
2 If a value is in excess of the benchmark, or outside the benchmark range (for pH), you must implement the Tier 1 or Tier 2 responses in the General Permit. Tier 2
Monthly sampling shall be done until 3 consecutive samples are below the benchmark or within the benchmark range.
3 TSS benchmark values are 100 mg/l, except when discharging to ORW, HQW, Trout, and PNA waters where they are 50 mg/l.
4 For each sampled measurable storm event the total precipitation must be recorded using data from an on -site rain gauge.
Permit Date: 7/1/2011-60/30/2015 Last Revised 7/13/11
Page 1 of 2

Part'sr Vehicle Maintenance Activity Monitoring Requirements for facilities using > 55 gal of new motor oil/month — averaged over a calendar year.
Outfall
No.
Date Sample
p
Collected
(mo/dd/yr)1
pH
(Standard
Units)
TPH using method
1664A SGT HEM
(mg/L)
Total Suspended
Solids
(mg/L)
Event
Duration
(minutes)
Total
Rainfall°
(in)
New Motor oil
Usage
(gal/month)
In Tier 2
Monthly
Monitoring?
(y/n)
# of Months
in Tier 2
2
Sampling
6-92
15
1002'
-
-
-
-
-
HAS YOUR FACILITY HAD 4 OR MORE BENCHMARK EXCEEDENCES AT ANY ONE OUTFALL (INCLUDING VEHICLE MAINTENANCE)? YES ❑ NO
HAVE YOU CONTACTED THE REGION? YES ❑ NO
REGIONAL OFFICE CONTACT NAME:
Mail Original and one copy of this DMR (including all "No Flow" & "No Discharge" reports) within 30 days of receipt of sample (or at end of monitoring period
in case of "No Flow") to:
Division of Water Quality
Attn: DWQCentral Files
1617 Mail Service Center
Raleigh, North Carolina 27699-1617
YOU MUST SIGN THIS CERTIFICATION FOR ANY INFORMATION REPORTED:
"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
am aware teat there are signifi �ntp�e},n�a-llties for submitting false information, including the possibility of fines and imprisonment for knowing violations."
10/30/2015
(Signature of Permittee) {Date)
Permit Date: 7/1/2011-60/30/2015 Last Revised 7/13/11
Page 2 of 2

STORMWATER DISCHARGE OUTFALL (SDO) - Semi -Annual MONITORING FORM
GENERAL PERMIT NO. NCG140000
CERTIFICATE OF COVERAGE N0. NCG140218 SAMPLE COLLECTION YEAR: 2015
FACILITY NAME: Thomas Concrete of Carolina -Durham Plant SAMPLING PERIOD: ❑ July -December ® January -June
PERSON COLLECTING SAMPLES Susan Bostian COUNTY Durham
CERTIFIED LABORATORY ESC Lab # ENV 375 PHONE NO. [phone]
Lab # ADD TO LISTSERVE? []YES ®NO EMAIL:
OPTIONAL INFO: June Monitoring event DISCHARGING TO CLASS: ❑SA ❑HQW ❑PNA ❑Trout ®Other,
Part A: Stormwater Monitoring Requirements
Outfall No.
Date Sample
Collected
(mo/dd/yr OR
NO FLOW)'
pH
(Standard
Units}
TSS
(mg/L)
Event
Duration
(minutes}
Total
4
Rainfall
(in}
In Tier 2
Monthly
Monitoring?
(y/n)
#of Months in Tier
2 Sampling'
-
-
6-92
1002,3
-
-
-
-
001'
No Discharge
y
16
U
CENTRAL
FILES
DWR S
1 If "NO FLOW" or "NO DISCHARGE, Enter "NO FLOW" or "NO DISCHARGE" for each outfall here. Please make sure to mark the sample period above.
z If a value is in excess of the benchmark, or outside the benchmark range (for pH), you must implement the Tier 1 or Tier 2 responses in the General Permit. Tier 2
Monthly sampling shall be done until 3 consecutive samples are below the benchmark or within the benchmark range.
3 TSS benchmark values are 100 mg/l, except when discharging to ORW, HQW, Trout, and PNA waters where they are 50 mg/l.
For each sampled measurable storm event the total precipitation must be recorded using data from an on -site rain gauge.
Permit Date: 7/1/2011-60/30/2015 Last Revised 7/13/11
Page 1 of 2

Part B: Vehicle Maintenance Activity Monitoring Requirements for facilities using > 55 gal of new motor oil/month — averaged over a calendar year.
Outfall
No.
Date Sample
Collected
(mo/dd/yr)1
pH
(Standard
Units)
TPH using method
1554ASGT-HEM
(mg/L)
Total Suspended
Solids
(mg/L)
Event
Duration
(minutes)
Total
a
Rainfall
(in)
New Motor Oil
Usage
(gal/month)
In Tier 2
Monthly
Monitoring?
(Y/n)
# of Months
in Tier 2
Sampling2
6-92
152
1002.3
HAS YOUR FACILITY HAD 4 OR MORE BENCHMARK EXCEEDENCES AT ANYONE OUTFALL (INCLUDING VEHICLE MAINTENANCE)? YES ❑ NO
HAVE YOU CONTACTED THE REGION? YES ❑ NO
REGIONAL OFFICE CONTACT NAME:
Mail OriEinal and one coDv of this DMR fincludine all "No Flow" & "No Discharee" reports) within 30 days of receipt of samDle for at end of monitorine period
in case of "No Flow") to:
Division of Water Quality
Attn: DWQ Central Files
1617 Mail Service Center
Raleigh, North Carolina 27699-1617
YOU MUST SIGN THIS CERTIFICATION FOR ANY INFORMATION REPORTED:
"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.
am aware tha #here are significant penalties for submitting false information, including the possibility of fines and imprisonment for knowing violations."
7/31/2015
(Signature of Permittee) (Date)
Permit Date: 7/1/2011-60/30/2015 Last Revised 7/13/11
Page 2 of 2

PROCESS WASTEWATER — Quarterly Discharge Monitoring Report
GENERAL PERMIT NO. NCG140000
CERTIFICATE OF COVERAGE NO. NCG140218
FACILITY NAME: _Thomas Concrete of Carolina- Durham Plant
PERSON COLLECTING SAMPLES: Susan Bastian
CERTIFIED LABORATORY:_ESC Lab # ENV375
Lab #
LIMIT VIOLATIONS? YES ® NO ❑
Part A: Wastewater Monitoring Requirements
SAMPLE COLLECTION YEAR: 2015
SAMPLE QUARTER: ❑Jul -Sept ❑Oct -Dec ❑Jan-MarcF
COUNTY: Durham
PHONE NO. (_919 _)S98-0456
ADD TO LISTSERVE? ❑YES ®NO EMAIL:
DISCHARGING TO CLASS: []SA ❑HQW ❑PNA ❑Trout
OPTIONAL INFO:
®April -June
COD
®Other
—94
Outfall No.
Date Sample
Collected
(mm/dd/yr)
Type of Wastewater
(VE, RM, MD)'
pH
(standard)
Total Suspended
Solids
(mg/L)
Settleable
Solids
(mL/L)
TPH using
method 1664A
SGT-HEM6
(mg/L)
Discharge
Duration
(minutes)
Total Flow
(gallons/day)'
-
-
-
6-93,4
303.5
53
(15)6
-
-
001
No Discharge
VE, RM
_
Total Flow:
4,790 gpd
R
AUG
0
CENTRAL
UVVK SECTI
N
1 If wastewater systems have not discharged in this quarter — report "No Flow" or "No Discharge" here. Please make sure to mark the sample quarter above.
z Report the abbreviation for the type of Authorized Wastewater Discharges here: Vehicle and Equipment Cleaning (VE), Raw Material Stockpiles (RM), Mixing Drum
Cleanout (MD). Report more than one type if the waste -stream is commingled.
3If an effluent limit is exceeded twice in a row, the permittee is required to institute monthly monitoring for that parameter for six months, unless DWQ RO staff
notifies you to continue monitoring.
" pH limits are 6-9 S.U. for wastewater discharges to freshwaters, and 6.8-8.5 S.U. for discharges to saltwaters.
Permit Date:7/1/2010-06/30/2015
Last Revised 07/13/11
Page 1 of 2

s TSS limits are 20 mg/L for wastewater discharges to HQW waters, 10 mg/L for Trout and PNA waters, and 30 mg/L for all other water classifications.
6 Process wastewater discharges shall only be monitored for TPH when commingled with stormwater discharges from VMA areas. TPH does not have a limit for wastewater,
but instead is subject to benchmarks and provisions of Part IV, Section A, including the Tiered Response Action.
' Flow rate can be measured continuously or calculated. Flow limits for wastewater discharges to HQW waters shall be set to 50% of the Summer 7Q10 Flow as per 15A
NCAC 02B .0224. Permittees who discharge wastewater to HQW waters shall obtain a Summer 7Q10 flow and report this information to DWQ. If the permittee cannot
obtain a Summer 7Q10 flow for the receiving waters at the discharge location, the permittee shall notify DWQ and the DWQ Regional Office may require an annual flow
report on a case -by -case basis.
MAIL ORIGINAL AND ONE COPY OF THIS ANNUAL SUMMARY (INCLUDING ALL "NO FLOW", "NO DISCHARGE") WITHIN 30 DAYS OF RECEIPT OF SAMPLE (OR
AT END OF MONITORING PERIOD IN CASE OF "NO FLOW") TO:
Division of Water Quality
Attn: DWQ Central Files
1617 Mail Service Center
Raleigh, North Carolina 27699-1617
[phone]
YOU MUST SIGN THIS CERTIFICATION FOR ANY INFORMATION REPORTED:
"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
(Signature of Permittee)
Permit Date:7/1/2010-05/30/2015
7/31/2015
(Date)
Last Revised 07/13/11
Page 2 of 2

STORMWATER DISCHARGE OUTFALL (SDO) - Semi -Annual MONITORING FORM
GENERAL PERMIT NO. NCG140000
CERTIFICATE OF COVERAGE NO. NCG140218
FACILITY NAME: Thomas Concrete of Carolina -Durham Plant
PERSON COLLECTING SAMPLES Kevin Kelt
CERTIFIED LABORATORY ESC Lab # ENV 375_
Lab #
OPTIONAL INFO: August Monitoring event
Part A: Stormwater Monitoring Requirements
RECEIVED
SAMPLE COLLECTION YEAR: 2015
SAMPLING PERIOD: ® July -December ❑ January -June SAP 7 �UI`J
COUNTY Durham CENTRAL FILES
PHONE NO. [phone] DWR SECTION
ADD TO LISTSERVE? ❑YES ®NO EMAIL:
DISCHARGING TO CLASS: []SA ❑HQW ❑PNA ❑Trout
®Other
Outfall No.
Date Sample
Collected
(mo/dd/yr OR
NO FLOW)'
pH
(Standard
Units)
TSS
(mg/L}
Event
Duration
(minutes)
Total
Rainfall A
(in)
In Tier 2
Monthly
Monitoring?
(Y/n)
# of Months in Tier
2 Sampling�
-
-
6-9
100 ,
-
-
-
-
001
No Discharge
y
18
1 if "NO FLOW" or "NO DISCHARGE, Enter "NO FLOW" or "NO DISCHARGE" for each outfall here. Please make sure to mark the sample period above.
2 If a value is in excess of the benchmark, or outside the benchmark range {for pH}, you must implement the Tier 1 or Tier 2 responses in the General Permit. Tier 2
Monthly sampling shall be done until 3 consecutive samples are below the benchmark or within the benchmark range.
3 TSS benchmark values are 100 mg/I, except when discharging to ORW, HQW, Trout, and PNA waters where they are 50 mg/I.
° For each sampled measurable storm event the total precipitation must be recorded using data from an on -site rain gauge.
Permit Date: 7/1/2011-60/30/2015 Last Revised 7/13/11
Page 1 of 2

Part B: Vehicle Maintenance Activity Monitoring Requirements for facilities using > 55 gal of new motor oil/month — averaged over a calendar year.
f•
Outfall Date Sample
No. Collected
{mo/dd/yr)1
pH
(Standard
Units)
TPH using method
1664A SGT-HEM
(mg/L)
Total Suspended
Solids
(mg/L)
Event
Duration
(minutes)
Total
n
Rainfall
(in)
New Motor Oil
Usage
(gal/month)
In Tier 2
Monthly
Monitoring?
[y/n)
# of Months
in Tier 2
z
Sampling
6-9
15
100 ,
-
-
-
-
-
HAS YOUR FACILITY HAD 4 OR MORE BENCHMARK EXCEEDENCES AT ANY ONE OUTFALL (INCLUDING VEHICLE MAINTENANCE)? YES ❑ NO
HAVE YOU CONTACTED THE REGION? YES ❑ NO
REGIONAL OFFICE CONTACT NAME:
Mail Original and one copy of this DMR(including all "No Flow" & "No Discharge" reports) within 30 days of receipt of sample or at end of monitoring period
in case of "No Flow") to:
Division of Water Quality
Attn: DWQ Central Files
1617 Mail Service Center
Raleigh, North Carolina 27699-1617
YOU MUST SIGN THIS CERTIFICATION FOR ANY INFORMATION REPORTED:
"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 violations."
C.
(Signature of Permittee)
9/9/2015
(Date)
Permit Date:7/1/2011-60/30/2015
Last Revised 7/13/11
Page 2 of 2

W
PROCESS WASTEWATER — Quarterly Discharge Monitoring Report
GENERAL PERMIT No. NCG140000
CERTIFICATE OF COVERAGE NO. NCG140218
FACILITY NAME: _Thomas Concrete of Carolina- Durham Plant
PERSON COLLECTING SAMPLES: Susan Bostian
CERTIFIED LABORATORY: ESC Lab # ENV375
Lab #
LIMIT VIOLATIONS? YES ® NO ❑
Part A: Wastewater Monitoring Requirements
SAMPLE COLLECTION YEAR: 2015
SAMPLE QUARTER: ®Jul -Sept ❑Oct -Dec
COUNTY. Durham
PHONE NO. (_919 _) 598-0456
ADD TO LISTSERVE? []YES ®NO EMAIL:
DISCHARGING TO CLASS: ❑SA ❑HQW
OPTIONAL INFO:
❑Jan -March
❑PNA []Trout
❑April -Jun
1V
®Other
Outfall No.
Date Sample
Collected'
(mm/dd/yr)
Type of Wastewater
(VE, RM, MD)'
pH
(standard)
Total Suspended
Solids
(mg/L)
Settleable
Solids
(mL/L)
TPH using
method 1664A
SGT HEM'
(mg/L)
Discharge
Duration
(minutes)
Total Flow
7
(gallons/day)
-
-
-
6-93'4
303,5
53
(15)6
-
-
001
7/23/15
VE, RM
9.78
75.5
<0.033
Total Flow:
4,790 gpd
-
n.;
FILES
1 If wastewater systems have not discharged in this quarter — report "No Flow" or "No Discharge" here. Please make sure to mark the sample quarter above.
Z Report the abbreviation for the type of Authorized Wastewater Discharges here: Vehicle and Equipment Cleaning (VE), Raw Material Stockpiles (RM), Mixing Drum
Cleanout (MD). Report more than one type if the waste -stream is commingled.
3 If an effluent limit is exceeded twice in a row, the permittee is required to institute monthly monitoring for that parameter for six months, unless DWQ RO staff
notifies you to continue monitoring.
4 pH limits are 6-9 S.U. for wastewater discharges to freshwaters, and 6.8-8.5 S.U. for discharges to saltwaters.
Permit Date: 7/1/2010-06/30/2015 Last Revised 07/13/11
Page 1 of 2

_ 4 5 TSS limits are 20 mg/L for wastewater discharges to HQW waters, 10 mg/L for Trout and PNA waters, and 30 mg/L for all other water classifications.
6 PT-uLess wastewater discharges shall only be monitored for TPH when commingled with stormwater discharges from VMA areas. TPH does not have a limit for wastewater,
but instead is subject to benchmarks and provisions of Part IV, Section A, including the Tiered Response Action.
Flow rate can be measured continuously or calculated. Flow limits for wastewater discharges to HQW waters shall be set to 50% of the Summer 7Q10 Flow as per 15A
NCAC 02B .0224. Permittees who discharge wastewater to HQW waters shall obtain a Summer 7Q10 flow and report this information to DWQ. If the permittee cannot
obtain a Summer 7Q10 flow for the receiving waters at the discharge location, the permittee shall notify DWQ, and the DWQ Regional Office may require an annual flow
report on a case -by -case basis.
MAIL ORIGINAL AND ONE COPY OF THIS ANNUAL SUMMARY INCLUDING ALL "NO FLOW" "NO DISCHARGE" WITHIN 30 DAYS OF RECEIPT OF SAMPLE OR
AT END OF MONITORING PERIOD IN CASE OF "NO FLOW") TO:
Division of Water Quality _
Attn: DWQ Central Files
1617 Mail Service Center
Raleigh, North Carolina 27699-1617
[phone]
YOU MUST SIGN THIS CERTIFICATION FOR ANY INFORMATION REPORTED:
"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
violations."
moo,,,.. S C . GQ
(Signature of Permittee)
Permit Date:7/1/2010-06/30/2015
10/30/2015
(Date)
Last Revised 07/13/11
Page 2 of 2

STORIVIWATER DISCHARGE OUTFALL (SDO) - Semi -Annual MONITORING FORM
GENERAL PERMIT NO. NCG140000
CERTIFICATE OF COVERAGE NO. NCG140218
FACILITY NAME: Thomas Concrete of Carolina -Durham Plant
PERSON COLLECTING SAMPLES Kevin Kelt
CERTIFIED LABORATORY ESC Lab # ENV 375_
Lab #
OPTIONAL INFO: July Monitoring event
Part A: Stormwater Monitoring Requirements
RECEIVED
SAMPLE COLLECTION YEAR: 2015 SEP 17 2015
SAMPLING PERIOD: ® July -December ❑ January -June
COUNTY Durham CENTRAL FILES
PHONE NO. [phone] DWR SECTION
ADD TO LISTSERVE? ❑YES ®NO EMAIL:
DISCHARGING TO CLASS: ❑SA ❑HQW ❑PNA ❑Trout ®Other
Outfall No.
Date Sample
Collected
(mo/dd/yr OR
NO FLOW)'
PH
(Standard
Units}
TSS
(mg/L)
Event
Duration
{minutes)
Total 4
Rainfall
{in)
In Tier 2
Monthly
Monitoring?
(y/n)
# of Months in Tier
2 Samplingz
-
-
6-9
100 '
-
-
-
-
001
7/23/15
9.78
75.5
45
0.875"
y
17
1 If "NO FLOW" or "NO DISCHARGE, Enter "NO FLOW" or "NO DISCHARGE" for each outfall here. Please make sure to mark the sample period above.
2 If a value is in excess of the benchmark, or outside the benchmark range (for pH), you must implement the Tier 1 or Tier 2 responses in the General Permit. Tier 2
Monthly sampling shall be done until 3 consecutive samples are below the benchmark or within the benchmark range.
3 TSS benchmark values are 100 mg/l, except when discharging to ORW, HQW, Trout, and PNA waters where they are 50 mg/I.
For each sampled measurable storm event the total precipitation must be recorded using data from an on -site rain gauge.
:10—
w
J
Permit Date: 7/1/2011-60/30/2015 Last Revised 7/13/11
Page 1 of 2

Part B: Vehicle Maintenance Activity Monitoring Requirements for facilities using > 55 gal of new motor oil/month — averaged over a calendar year.
'
Outfall
No.
Date Sample
Collected 1
(mo/dd/yr)
pH
(Standard
Units)
TPH using method
1664ASGT-HEM
(mg/L)
Total Suspended
Solids
(mg/L)
Event
Duration
(minutes)
Total
a
Rainfall
(in)
New Motor Oil
Usage
(gal/month)
In Tier 2
Monthly
Monitoring?
(y/n)
# of Months
in Tier 2
5ampling2
6-9
15
100 '
-
-
-
-
-
HAS YOUR FACILITY HAD 4 OR MORE BENCHMARK EXCEEDENCES AT ANY ONE OUTFALL (INCLUDING VEHICLE MAINTENANCE)? YES ❑ NO
HAVE YOU CONTACTED THE REGION? YES ❑ NO
REGIONAL OFFICE CONTACT NAME:
Mail Original and one copv of this DMR (including all "No Flow" & "No Discharge" reports) within 30 days of receipt of sample for at end of monitorine period
in case of "No Flow_") to:
Division of Water Quality
Attn: DWQ Central Files
1617 Mail Service Center
Raleigh, North Carolina 27699-1617
YOU MUST SIGN THIS CERTIFICATION FOR ANY INFORMATION REPORTED:
"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
am aware that�ther�e} are significant penalties for submitting false information, including the possibility of fines and imprisonment for knowing violations."
9/9/2015
(Signature of Permittee) 'j (Date)
Permit Date: 7/1/2011-60/30/2015 Last Revised 7/13/11
Page 2 of 2

Ir
A�
';L
NCDENR
Stormwater Discharge Outfall (SDO)
Qualitative Monitoring Report
Forguidance on filling out thisform, please visit: httpJlnortal..ncdenr.org/web/Ir/npdes-stormwater/
Permit No.: N/C/_/_/_/_/_/_/_/ or Certificate of Coverage No.:
Facility Name: Thomas Concrete of Carolina -Durham Plant
County: Durham Phone No. [phone]
Inspector: Susan Bostian
Date of Inspection: 07 23 15
Time of Inspection: 12SO
Total Event Precipitation (inches). _.875"—
Was this a "Representative Storm Event" or "Measureable Storm Event" as defined by the permit?
(See information below.)
® Yes ❑ No
Please verify whether Qualitative Monitoring must be performed during a "representative storm
event" or "measureable storm event" (requirements vary, depending on the permit).
Qualitative monitoring requirements vary. Most permits require qualitative monitoring to be
performed during a "representative storm event" or during a "measureable storm event." However,
some permits do not have this requirement. Please refer to these definitions, if applicable.
A "representative storm event" is a storm event that measures greater than 0.1 inches of rainfall
and that is preceded by at least 72 hours (3 days) 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.
A "measurable storm event" is a storm event that results in an actual discharge from the
permitted site outfall. The previous measurable storm event must have been at least 72 hours
prior. The 72-hour storm interval does not apply if the permittee is able to document that a shorter
interval is representative for local storm events during the sampling period, and the permittee
obtains approval from the local DWQ Regional Office.
By this signature, I certify that this report is accurate and complete to the best of my knowledge:
(Signature of Permittee or Des gnee)
SWU-242, Last modified 7/31/2013
Page 1 of 2

1. Outfall Description:
Outfall No. 01 Structure (pipe, ditch, etc.) Weir Outlet
Receiving Stream: Third Fork Creek Branc
Describe the industrial activities that occur within the outfall drainage area: Bulk storage
of raw materials, vehicle transport, wastewater treatment;
2. Color: Describe the color of the discharge using basic colors (red, brown, blue, etc.) and tint
(light, medium, dark) as descriptors: _murky white/clear
3. Odor: Describe any distinct odors that the discharge may have (i.e., smells strongly of oil,
weak chlorine odor, etc.): No distinct odor
4. Clarity: Choose the number which best describes the clarity of the discharge, where 1 is
clear and 5 is very cloudy:
1 2 3 4 5
5. Floating Solids: Choose the number which best describes the amount of floating solids in
the stormwater discharge, where 1 is no solids and 5 is the surface covered with floating solids:
1 2 3 4 5
6. Suspended Solids: Choose the number which best describes the amount of suspended
solids in the stormwater discharge, where 1 is no solids and 5 is extremely muddy:
1 2 3 4 5
7. Is there any foam in the stormwater discharge? Yes No
8. Is there an oil sheen in the stormwater discharge? Yes No
9. Is there evidence of erosion or deposition at the outfall? Yes No
10. Other Obvious Indicators of Stormwater Pollution:
List and describe pH: 9.78
Note: Low clarity, high solids, and/or the presence of foam, oil sheen, or erosion/deposition
may be indicative of pollutant exposure. These conditions warrant further investigation.
Page 2 of 2
SWU-242, Last modified 7/31/2013

STORMWATER DISCHARGE OUTFALL (SDO) - Semi -Annual MONITORING FORM
GENERAL PERMIT NO. NCG140000
CERTIFICATE OF COVERAGE NO. NCG140218
FACILITY NAME: Thomas Concrete of Carolina -Durham Plant
PERSON COLLECTING SAMPLES Susan Bostian
CERTIFIED LABORATORY ESC Lab # ENV 375_
Lab #
OPTIONAL INFO: April Monitoring event
Part A: Stormwater Monitoring Requirements
SAMPLE COLLECTION YEAR: 2015
SAMPLING PERIOD: ❑ July -December ® January -June
COUNTY Durham
PHONE NO. [phone]
ADD TO LISTSERVE? []YES ®NO EMAIL:
DISCHARGING TO CLASS: []SA ❑HQW ❑PNA []Trout
®Other
Outfafl No.
Date Sample
Collected
(mo/dd/yr OR
NO FLOW)t
PH
(Standard
Units)
TS5
(mg/L)
Event
Duration
(minutes}
Total
Rainfall ,
(in)
In Tier 2
Monthly
Monitoring?
(y/n)
# of Months in Tier
2 Sampling2
-
6-91
1002,3
-
-
-
001
No Discharge
y
14
' If "NO FLOW" or "NO DISCHARGE, Enter "NO FLOW" or "NO DISCHARGE" for each outfall here. Please make sure to mark the sample period above.
If a value is in excess of the benchmark, or outside the benchmark range (for pH), you must implement the Tier 1 or Tier 2 responses in the General Permit. Tier 2
Monthly sampling shall be done until 3 consecutive samples are below the benchmark or within the benchmark range.
3 TSS benchmark values are 100 mg/I, except when discharging to ORW, HQW, Trout, and PNA waters where they are 50 mg/l.
For each sampled measurable storm event the total precipitation must be recorded using data from an on -site rain gauge.
Permit Date: 7/1/2011-60/30/2015 Last Revised 7/13/11
Page 1 of 2

Part B: Vehicle Maintenance Activity Monitoring Requirements for facilities using > 55 gal of new motor oil/month — averaged over a calendar year.
Outfall
No.
Date Sample
( Co/ected
i
pH
(Standard
Units)
TPH using method
1664A SGT-HEM
(mg/L)
Total Suspended
Solids
(mg/L)
Event
Duration
(minutes)
Total
Rainfall a
(in)
New Motor oil
Usage
(gal/month)
In Tier 2
Monthly
Mo itor ng?
ti of Months
in Tier 2
5ampling2
6-92
152
1002,3
HAS YOUR FACILITY HAD 4 OR MORE BENCHMARK EXCEEDENCES AT ANY ONE OUTFALL (INCLUDING VEHICLE MAINTENANCE)? YES ❑ NO
HAVE YOU CONTACTED THE REGION? YES ❑ NO
REGIONAL OFFICE CONTACT NAME:
Mail Original and one coot/ of this DMR (including all "No Flow" & "No Discharge" reports) within 30 days of receipt of sample for at end of monitorine period
in case of "No Flow") to:
Division of Water Quality
Attn: DWQ Central Files
1617 Mail Service Center
Raleigh, North Carolina 27699-1617
YOU MUST SIGN THIS CERTIFICATION FOR ANY INFORMATION REPORTED:
"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.
am aware tha ere are significant penalties for submitting false information, including the possibility of fines and imprisonment for knowing violations."
c , G o- 6/8/2015
(Signature of Permittee) v (Date)
Permit Date: 7/1/2011-60/30/2015 Last Revised 7/13/11
Page 2 of 2

PROCESS WASTEWATER — Quarterly Discharge Monitoring Report
_ x4
GENERAL PERMIT No. NCG140000
CERTIFICATE OF COVERAGE NO. NCG140218 SAMPLE COLLECTION YEAR: 2015
FACILITY NAME: _Thomas Concrete of Carolina- Durham Plant SAMPLE QUARTER: []Jul -Sept ❑Oct -Dec ®Jan -March ❑April -June
PERSON COLLECTING SAMPLES: Susan Bostian COUNTY: Durham
CERTIFIED LABORATORY:
Lab # ENV37S
Lab #
LIMIT VIOLATIONS? YES ® NO ❑
Part A: Wastewater Monitoring Requirements
PHONE NO. (_919 _)598-0456 mn�
ADD TO LISTSERVE? []YES ®NO EMAIL: r-
DISCHARGING TO CLASS: ❑SA ❑HQW ❑PNA ❑Trout ®Other "i
OPTIONAL INFO:
Outfall No.
Date Sample
1
Collected
(mm/dd/yr)
Type of Wastewater
z
RMMD)
(VE, ,
pH
{standard}
Total Suspended
Solids
(mg/L)
Settleable
Solids
(mL/L)
TPH using
method 1664A
6
SG
1L)
{mg/L}
Discharge
Duration
(minutes)
Total Flow
7
(gallons/dayj
-
-
-
6-93'4
303s
53
(15)6
-
-
001
No Discharge
VE, RM
Total Flow:
4,790 gpd
1 If wastewater systems have not discharged in this quarter — report "No Flow" or "No Discharge" here. Please make sure to mark the sample quarter above.
z Report the abbreviation for the type of Authorized Wastewater Discharges here: Vehicle and Equipment Cleaning (VE), Raw Material Stockpiles (RM), Mixing Drum
Cleanout (MD). Report more than one type if the waste -stream is commingled.
3 if an effluent limit is exceeded twice in a row, the permittee is required to institute monthly monitoring for that parameter for six months, unless DWQ RO staff
notifies you to continue monitoring.
° pH limits are 6-9 S.U. for wastewater discharges to freshwaters, and 6.8-8.5 S.U. for discharges to saltwaters.
Permit Date:7/1/2010-06/30/2015
Last Revised 07/13/11
-C r*
GENIC
Page 1 of 2

s TSS limits are 20 mg/L for wastewater discharges to HQW waters, 10 mg/L for Trout and PNA waters, and 30 mg/L for all other water classifications.
6 Processwastewater discharges shall only be monitored for TPH when commingled with stormwater discharges from VIVA areas. TPH does not have a limit for wastewater,
but instead is subject to benchmarks and provisions of Part IV, Section A, including the Tiered Response Action.
7 Flow rate can be measured continuously or calculated. Flow limits for wastewater discharges to HQW waters shall be set to 50% of the Summer 7Q10 Flow as per 15A
NCAC 02B .0224. Permittees who discharge wastewater to HQW waters shall obtain a Summer 7Q10 flow and report this information to DWQ. If the permittee cannot
obtain a Summer 7Q10 flow for the receiving waters at the discharge location, the permittee shall notify DWQ, and the DWQ Regional Office may require an annual flow
report on a case -by -case basis.
MAIL ORIGINAL AND ONE COPY OF THIS ANNUAL SUMMARY (INCLUDING ALL "NO FLOW", "NO DISCHARGE") WITHIN 30 DAYS OF RECEIPT OF SAMPLE OR
AT END OF MONITORING PERIOD IN CASE OF "NO FLOW") TO:
Division of Water Quality
Attn: DWQ Central Files
1617 Mail Service Center
Raleigh, North Carolina 27699-1617
[phone]
YOU MUST SIGN THIS CERTIFICATION FOR ANY INFORMATION REPORTED:
"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
j5fgnature of
Permit Date:7/1/2010-06/30/2015
3/31/2015
(Date)
Last Revised 07/13/11
Page 2 of 2

STORMWATER DISCHARGE OUTFALL (SDO) - Semi -Annual MONITORING FORM
GENERAL PERMIT NO. NCG140000
CERTIFICATE OF COVERAGE N0. NCG140218
FACILITY NAME: Thomas Concrete of Carolina -Durham Plant
PERSON COLLECTING SAMPLES Susan Bostian
CERTIFIED LABORATORY ESC Lab # ENV 375_
Lab #
OPTIONAL INFO: January Monitoring event
Part A: Stormwater Monitoring Requirements
SAMPLE COLLECTION YEAR: 2015
SAMPLING PERIOD: ❑ July -December ® January -June
COUNTY Durham
PHONE NO. [phone]
ADD TO LISTSERVE? DYES ®NO EMAIL:
DISCHARGING TO CLASS: ❑SA ❑HQW ❑PNA ❑Trout ®Other
Outfall No.
Date Sample
Collected
(mo/dd/yr OR
NO FLOW)1
pH
(Standard
Units)
TSS
(mg/L)
Event
Duration
(minutes)
Total
Rainfall4
(in)
In Tier 2
Monthly
Monitoring?
(y/n)
# of Months in Tier
2 Samplingx
-
-
6-9
100-
001
No Discharge
y
11
REGENtu
CENTI
tAi
I If "NO FLOW" or "NO DISCHARGE, Enter "NO FLOW" or "NO DISCHARGE" for each outfall here. Please make sure to mark the sample period above.
Z If a value is in excess of the benchmark, or outside the benchmark range (for pH), you must implement the Tier 1 or Tier 2 responses in the General Permit. Tier 2
Monthly sampling shall be done until 3 consecutive samples are below the benchmark or within the benchmark range.
3 TS5 benchmark values are 100 mg/l, except when discharging to ORW, HQW, Trout, and PNA waters where they are 50 mg/l.
4 For each sampled measurable storm event the total precipitation must be recorded using data from an on -site rain gauge.
C7
Mac
Permit Date: 7/1/2011-60/30/2015 Last Revised 7/13/11
Page 1 of 2

Part B: Vehicle Maintenance Activity Monitoring Requirements for facilities using > 55 gal of new motor oil/month — averaged over a calendar year.
Outfall
No.
Date Sampie
Collected
{mo/dd/yr)1
pH
(standard
Units)
TPH using method
1664A SGT-HEM
(mg/L)
Total Suspended
Solids
(mg/L)
Event
Duration
(minutes)
Total
a
Rainfall
(in)
New Motor Oil
Usage
(gal/month)
In Tier 2
Monthly
Monitoring?
(y/n)
# of Months
in Tier 2
Z
Sampling
6-9
15
100,
-
-
-
-
-
HAS YOUR FACILITY HAD 4 OR MORE BENCHMARK EXCEEDENCES AT ANY ONE OUTFALL (INCLUDING VEHICLE MAINTENANCE)? YES ❑ NO
HAVE YOU CONTACTED THE REGION? YES ❑ NO
REGIONAL OFFICE CONTACT NAME:
Mail Orieinal and one coov of this DMR fincludine all "No Flow" & "No Discharee" reports) within 30 days of receipt of sample for at end of monitorine period
in case of "No Flow") to:
Division of Water Quality
Attn: DWQ Central Files
1617 Mail Service Center
Raleigh, North Carolina 27699-1617
YOU MUSTSIGN THIS CERTIFICATION FOR ANY INFORMATION REPORTED:
"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_aAare that there/�'er signifisapt penalt),Rsor submittA false information, including the possibility of fines and imprisonment for knowing violations."
(Signature of Permittee)
3/31/2015
(Date)
Permit Date: 7/1/2011-60/30/2015
Last Revised 7/13/11
Page 2 of 2

STORMWATER DISCHARGE OUTFALL (SDO) - Semi -Annual MONITORING FORM
GENERAL PERMIT NO. NCG140000
CERTIFICATE OF COVERAGE NO. NCG140218
FACILITY NAME: Thomas Concrete of Carolina -Durham Plant
PERSON COLLECTING SAMPLES Susan Bostian
CERTIFIED LABORATORY ESC Lab # ENV 375_
Lab #
OPTIONAL INFO: February Monitoring event
Part A: Stormwater Monitoring Requirements
SAMPLE COLLECTION YEAR: 2015
SAMPLING PERIOD: ❑ July -December ® January -June
COUNTY Durham
PHONE NO. [phone]
ADD TO LISTSERVE? DYES ®NO EMAIL:
DISCHARGING TO CLASS: ❑SA ❑HQW ❑PNA ❑Trout
®Other
Outfall No.
Date Sample
Collected
(mo/dd/yr OR
NO FLOW)'
pH
(Standard
Units}
TSS
(mg/L)
Event
Duration
(minutes}
Total A
Rainfall
{in)
In Tier 2
Monthly
Monitoring?
(y/n)
# of Months in Tier
z
2 Sampling
-
-
6-9
100 ,
-
-
-
-
001
No Discharge
y
12
2 If "NO FLOW" or "NO DISCHARGE, Enter "NO FLOW" or "No DISCHARGE" for each outfall here. Please make sure to mark the sample period above.
z If a value is in excess of the benchmark, or outside the benchmark range (for pH), you must implement the Tier 1 or Tier 2 responses in the General Permit. Tier 2
Monthly sampling shall be done until 3 consecutive samples are below the benchmark or within the benchmark range.
3 TSS benchmark values are 100 mg/I, except when discharging to ORW, HOW, Trout, and PNA waters where they are SO mg/I.
°For each sampled measurable storm event the total precipitation must be recorded using data from an on -site rain gauge.
Permit Date: 7/1/2011-60/30/2015 Last Revised 7/13/11
Page 1 of 2

Part B: Vehicle Maintenance Activity Monitoring Requirements for facilities using > 55 gal of new motor oil/month — averaged over a calendar year.
Outfal!
Na.
Date Sample
Collected 1
{mo/dd/yr)
PH
(Standard
Units)
TPH using method
1664A SGT-HEM
(mg/L)
Total Suspended
Solids
(mg/L)
Event
Duration
(minutes)
Total
Rainfalla
(in)
New Motor Oil
Usage
(gal/month)
In Tier 2
Monthly
(y/n) Monitoring?
# of Months
in Tier 2
2
Sampling
6-9
15
100 ,
-
-
-
-
-
HAS YOUR FACILITY HAD 4 OR MORE BENCHMARK EXCEEDENCES AT ANY ONE CUTFALL (INCLUDING VEHICLE MAINTENANCE)? YES [:]NON
HAVE YOU CONTACTED THE REGION? YES ❑ NO
REGIONAL OFFICE CONTACT NAME:
Mail Original and one coov of this DMR (including all "No How" & "No Discharge" reoorts) within 30 days of receipt of sample (or at end of monitoring period
in case of "No Flow") to:
Division of water Quality
Attn: DWQ Central Files
1617 Mail Service Center
Raleigh, North Carolina 27699-1617
YOU MUST SIGN THIS CERTIFICATION FOR ANY INFORMATION REPORTED:
"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.
am,aYyare that thefe are significanyRenalties fW su4mitting false information, including the possibility of fines and imprisonment for knowing violations."
V\
(Signature of Per
3/31/2015
(Date)
Permit Date: 7/1/2011-60/30/2015 Last Revised 7/13/11
Page 2 of 2

STORMWATER DISCHARGE OUTFALL (SDO) - Semi -Annual MONITORING FORM
GENERAL PERMIT NO. NCG140000
CERTIFICATE OF COVERAGE N0. NCG140218
FACILITY NAME: Thomas Concrete of Carolina -Durham Plant
PERSON COLLECTING SAMPLES Susan Bostian
CERTIFIED LABORATORY ESC Lab # ENV 375_
OPTIONAL INFO: March Monitoring event
Part A: Stormwater Monitoring Requirements
SAMPLE COLLECTION YEAR: 2015
SAMPLING PERIOD: ❑ July -December ® January -June
COUNTY Durham
PHONE NO. [phone]
ADD TO LISTSERVE? DYES ®NO EMAIL:
DISCHARGING TO CLASS: ❑SA E]HQW ❑PNA ❑Trout ®Other,
Outfall No,
Date Sample
Collected
(mo/dd/yr OR
NO FLOW);
pH
{Standard
Units)
TS5
(mg/L)
Event
Duration
(minutes]
Total
4
Rainfall
(in)
In Tier 2
Monthly
Monitoring?
(y/n)
#f of Months in Tier
2 SamplingZ
-
-
6-9
100 .
-
-
-
001
No Discharge
y
13
1 If "NO FLOW" or "NO DISCHARGE, Enter "NO FLOW" or "NO DISCHARGE" for each outfall here. Please make sure to mark the sample period above.
z If a value is in excess of the benchmark, or outside the benchmark range (for pH), you must implement the Tier 1 or Tier 2 responses in the General Permit. Tier 2
Monthly sampling shall be done until 3 consecutive samples are below the benchmark or within the benchmark range.
a TSS benchmark values are 100 mg/I, except when discharging to ORW, HQW, Trout, and PNA waters where they are 50 mg/I.
For each sampled measurable storm event the total precipitation must be recorded using data from an on -site rain gauge.
Permit Date: 7/1/2011-60/30/2015 Last Revised 7/13/11
Page 1 of 2

Part B: Vehicle Maintenance Activity Monitoring Requirements for facilities using > 55 gal of new motor oil/month — averaged over a calendar year.
Outfall
No.
Date Sample
Collected
(mo/dd/yr}1
pH
(Standard
Units)
TPH using method
1664A SGT-HEM
(mg/L)
Total Suspended
Solids
(mg/L)
Event
Duration
(minutes)
Total
Rainfall4
(in)
New Motor Oil
Usage
(gal/month)
1n Tier 2
Monthly
Monitoring?
(y/n)
# of Months
in Tier 2
2
Sampling
6-9
15
100 '
-
-
-
-
-
HAS YOUR FACILITY HAD 4 OR MORE BENCHMARK EXCEEDENCES AT ANY ONE OUTFALL (INCLUDING VEHICLE MAINTENANCE)? YES ❑ NO
HAVE YOU CONTACTED THE REGION? YES [:]NO
REGIONAL OFFICE CONTACT NAME:
Mail Original and one copy of this DMR (including all "No Flow" & "No Discharge" reports) within 30 days of receipt of sample for at end of monitoring period
in case of "No Flow") to:
Division of Water Quality
Attn: DWQ Central Files
1617 Mail Service Center
Raleigh, North Carolina 27699-1617
YOU MUST SIGN THIS CERTIFICATION FOR ANY INFORMATION REPORTED:
"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 inform ati n, the information submitted is, to the best of my knowledge and belief, true, accurate, and complete. I
am aware that ther�re signi�ant poa�gs for subTitting Ise information, including the possibility of fines and imprisonment for knowing violations."
(Signature of Permittee)
3/31/2015
(Date)
Permit Date. 7/1/2011-60/30/2015
Last Revised 7/13/11
Page 2 of 2

STORMWATER DISCHARGE OUTFALL (SDO) - Semi -Annual MONITORING FORM
GENERAL PERMIT NO. NCC3140000
CERTIFICATE OF COVERAGE NO. NCG140218
FACILITY NAME: Thomas Concrete of Carolina -Durham Plant
PERSON COLLECTING SAMPLES Susan Bostian
CERTIFIED LABORATORY ESC Lab # ENV 375�
Lab #
OPTIONAL INFO: September Monitoring event
Part A: Stormwater Monitoring Requirements
SAMPLE COLLECTION YEAR: 2014
SAMPLING PERIOD: ® July -December ❑ January -June
COUNTY Durham
PHONE NO. [phone]
ADD TO LISTSERVE? DYES ®NO EMAIL:
DISCHARGING TO CLASS: ®SA ❑HQW ❑PNA ❑Trout [:]Other
Outfall No.
Date Sample
Collected
(mo/dd/yr OR
NO FL0W)1
pH
(Standard
Units)
TS5
(mg/L)
Event
Duration
(minutes)
Total
4
Rainfall
(in)
In Tier 2
Monthly
Monitoring?
(y/n)
# of Months in Tier
z
2 Sampling
-
-
6-9
,002.3
-
-
-
-
001
09/08/2014
8,56
7.400
45
1
y
7
1 If "NO FLOW" or "NO DISCHARGE, Enter "NO FLOW" or "NO DISCHARGE" for each outfall here. Please make sure to mark the sample period"above
z If a value is in excess of the benchmark, or outside the benchmark range (for pH), you must implement the Tier 1 or Tier 2 responses in the General Permit. Tier 2
Monthly sampling shall be done until 3 consecutive samples are below the benchmark or within the benchmark range.
3 TSS benchmark values are 100 mg/I, except when discharging to ORW, HQW, Trout, and PNA waters where they are 50 mg/l.
For each sampled measurable storm event the total precipitation must be recorded using data from an on -site rain gauge.
W
LAW
Permit Date: 7/1/2011-60/30/2015 Last Revised 7/13/11
Page 1 of 2

Part B: Vehicle Maintenance Activity Monitoring Requirements for facilities using > 55 gal of new motor oil/month — averaged over a calendar year.
Outfall
No.
Date Sample
Collected
(mo/dd/yr)1
pH
Standard
Units)
TPH using method
1664A SGT HFM
(mg/i_}
Total Suspended
Solids
(mg/L}
Event
Duration
(minutes}
Total
a
Rainfall
(in)
New Motor Oil
Usage
(gal/month}
In Tier 2
Monthly
Monitoring?
(y/n)
# of Months
in Tier 2
2
Sampling
6-9
15
100 ,
-
-
-
-
-
•Y
( HAS�YOUR FACILITY HAD 4 OR MORE BENCHMARK EXCEEDENCES AT ANY ONE OUTFALL (INCLUDING VEHICLE MAINTENANCE)? YES ❑ NO
sPHAVE YOU CONTACTED THE REGION? YES ❑ NO
REGIONAL OFFICE CONTACT NAME:
Mail Orieinal and one coov of this DMR fincludine all "No Flow" & "No Discharge" reports) within 30 days of receipt of sample (or at end of monitoring period
in case of "No Flow") to:
Division of Water Quality
Attn: DWQ Central Files
1617 Mail Service Center
Raleigh, North Carolina 27699-1617
YOU MUST SIGN THIS CERTIFICATION FOR ANY INFORMATION REPORTED:
"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.
am aware that thhj9 e are si nificant penalties for submitting false information, including the possibility of fines and imprisonment for knowing violations."
`1--Olj_C G -� 12/29/2014
(Signature of Permittee)
Permit Date:7/l/2011-60/30/2015
(Date)
Last Revised 7/13/11
Page 2 of 2

Stormwater Discharge Outfall (SDO)
Qualitative Monitoring Report
For guidance on filling out this fonn, please visit: httn:/th2o.enr.state.nc.us/su/Forms Documents.htm#miscforms
1 4 0 2 1 8
Permit No.: NICI I_I I 1_I I 1 or Certificate of Coverage No.: NIC/GI 1_I_I_I 1 I
Facility Name: Thomas Concrete of Carolina- Durham Plant
County: Durham Phone No. (919) 5 9 8- 0 4 5 6
Inspector: Susan Bostian
Date of Inspection:
Time of Inspection: 1445
Total Event Precipitation (inches):
0.75
Was this a Representative Storm Event? (See information below) ® Yes ❑ No
Please check your permit to verify if Qualitative Monitoring must be performed during a representative
stonn event (requirements vary).
A "Representative Storm Event" is a storm event that measures greater than 0.1 inches of rainfall and that
is preceded by at least 72 hours (3 days) 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.
By this signature, I certify that this report is accurate and complete to the best of my knowledge:
(Signature of Permittee or Designee)
1. Outfall Description:
Outfall No. 01 Structure (pipe, ditch, etc.) Weir Outlet
Receiving Stream: Third Fork Creek Branch
Describe the industrial activities that occur within the outfall drainage area: Bulk Storage of
raw materials and petroleum, wastewater treatment
2. Color: Describe the color of the discharge using basic colors (red, brown, blue, etc.) and tint
(light, medium, dark) as descriptors: clear
3. Odor: Describe any distinct odors that the discharge may have (i.e., smells strongly of oil, weak
chlorine odor, etc.): No distinctive odor
Page l of 2
SWU-242-112608

4. Clarity: Choose the number which best describes the clarity of the discharge, where I is clear
and 5 is very cloudy:
(1 } 2 3 4 5
5. Floating Solids: Choose the number which best describes the amount of floating solids in the
stormwater discharge, where 1 is no solids and 5 is the surface covered with floating solids:
0 2 3 4 5
6. Suspended Solids: Choose the number which best describes the amount of suspended solids in
the stormwater discharge, where 1 is no solids and 5 is extremely muddy:
O2 3 4 5
7. Is there any foam in the stormwater discharge? Yes No
8. Is there an oil sheen in the stormwater discharge? Yes No
9. Is there evidence of erosion or deposition at the outfall? Yes No
10. Other Obvious Indicators of Stormwater Pollution:
List and describe pH (field -measured). 9.6
Note: Low clarity, high solids, and/or the presence of foam, oil sheen, or erosion/deposition may be
indicative of pollutant exposure. These conditions warrant further investigation.
Page 2 of 2
SWU-242-112608

PROCESS WASTEWATER — Quarterly Discharge Monitoring Report
GENERAL PERMIT No. NCG140000
CERTIFICATE OF COVERAGE NO. NCG140218
FACILITY NAME: _Thomas Concrete of Carolina- Durham Plant
PERSON COLLECTING SAMPLES: Susan Bostian
CERTIFIED LABORATORY: ESC Lab # ENV375
Lab #
LIMIT VIOLATIONS? YES ® NO ❑
Part A: Wastewater Monitoring Requirements
SAMPLE COLLECTION YEAR: 2014
SAMPLE QUARTER: ❑Jul -Sept ®Oct -Dec ❑Jan -March
COUNTY: Durham
PHONE NO. (..919 _)598-0456
ADD TO LISTSERVE? ❑YES ®NO EMAIL:
DISCHARGING TO CLASS: ®SA ❑HQW ❑PNA ❑Trout
OPTIONAL INFO:
[]April -June
[]Other,
Outfall No.
Date Sample
1
Collected
(mm/dd/yr)
Type of Wastewater
(VE, RM, MD}z
pH
(standard}
Total Suspended
Solids
(mg/L)
Settleable
Solids
(mL/L)
TPH using
method 1664A
S (mg/L}g/L)R6
Discharge
Duration
(minutes)
Total Flow
(gallons/day)'
- I
-
-
6-93'4
303's
53
(15)6
-
001
12/15/14
VE, RM
9.6
56.0
< 0.033
45
Total Flow:
4,790 gpd
1 If wastewater systems have not discharged in this quarter— report "No Flow" or "No Discharge" here. Please make sure to mark the sample quarter above.
a Report the abbreviation for the type of Authorized Wastewater Discharges here: Vehicle and Equipment Cleaning (VE), Raw Material Stockpiles (RM), Mixing Drum
Cleanout (MD). Report more than one type if the waste -stream is commingled.
31f an effluent limit is exceeded twice in a row, the permittee is required to institute monthly monitoring for that parameter for six months, unless DWQ RO staff
notifies you to continue monitoring.
4 pH limits are 6-9 S.U. for wastewater discharges to freshwaters, and 6.8-8.5 S.U. for discharges to saltwaters.
Permit Date: 7/1/2010-06/30/2015 Last Revised 07/13/11
Page 1 of 2

5 TSS limits are 20 mg/L for wastewater discharges to HQW waters, 10 mg/L for Trout and PNA waters, and 30 mg/L for all other water classifications.
6 Process wastewater discharges shall only be monitored for TPH when commingled with stormwater discharges from VMA areas. TPH does not have a limit for wastewater,
but instead is subject to benchmarks and provisions of Part IV, Section A, including the Tiered Response Action.
Flow rate can be measured continuously or calculated. Flow limits for wastewater discharges to HQW waters shall be set to 50% of the Summer 7Q10 Flow as per 15A
NCAC 02B .0224. Permittees who discharge wastewater to HQW waters shall obtain a Summer 7Q10 flow and report this information to DWQ. if the permittee cannot
obtain a Summer 7Q10 flow for the receiving waters at the discharge location, the permittee shall notify DWQ, and the DWQ Regional Office may require an annual flow
report on a case -by -case basis.
MAIL ORIGINAL AND ONE COPY OF THIS ANNUAL SUMMARY (INCLUDING ALL "NO FLOW". "NO DISCHARGE") WITHIN 30 DAYS OF RECEIPT OF SAMPLE (OR
AT END OF MONITORING PERIOD IN CASE OF "NO FLOW") TO:
Division of Water Quality
Attn: DWQ Central Files
1617 Mail Service Center
Raleigh, North Carolina 27699-1617
[phone]
YOU MUST SIGN THIS CERTIFICATION FOR ANY INFORMATION REPORTED.
"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
'Jiniatinnc "
�c�'A e . G
(Signature of Permittee)
Permit Date'. 7/1/2010-06/30/2015
12/29/2014
(Date)
Last Revised 07/13/11
Page 2 of 2

STORMWATER DISCHARGE OUTFALL (SDO) - Semi -Annual MONITORING FORM
GENERAL PERMIT NO. NCG140000
CERTIFICATE OF COVERAGE NO. NCG140218
FACILITY NAME: Thomas Concrete of Carolina -Durham Plant
PERSON COLLECTING SAMPLES Susan Bostian
CERTIFIED LABORATORY ESC Lab # ENV 375_
Lab #
OPTIONAL INFO: December Monitoring event
Part A: Stormwater Monitoring Requirements
SAMPLE COLLECTION YEAR: 2014
SAMPLING PERIOD: ® July -December ❑ January -June
COUNTY Durham
PHONE NO. [phone]
ADD TO LISTSERVE? []YES ®NO EMAIL:
DISCHARGING TO CLASS: ®SA ❑HQW ❑PNA ❑Trout
[]Other.
Outfall No.
Date Sample
Collected
(mo/dd/yr OR
NO FL0W)'
PH
(Standard
Units)
TS5
(mg/L)
Event
Duration
(minutes)
Total
4
Rainfall
(in)
In Tier 2
Monthly
Monitoring?
(y/n)
# of Months in Tier
2
2 Sampling
-
-
6-9
100 '
-
-
-
-
001
12/15/2014
9.60
56.0
30
0.75
y
10
i If "NO FLOW" or "NO DISCHARGE, Enter "NO FLOW" or "NO DISCHARGE" for each outfall here. Please make sure to mark the sample period above.
z If a value is in excess of the benchmark, or outside the benchmark range (for pH), you must implement the Tier 1 or Tier 2 responses in the General Permit. Tier 2
Monthly sampling shall be done until 3 consecutive samples are below the benchmark or within the benchmark range.
3 TSS benchmark values are 100 mg/l, except when discharging to ORW, HQW, Trout, and PNA waters where they are 50 mg/I.
4 For each sampled measurable storm event the total precipitation must be recorded using data from an on -site rain gauge.
Permit Date: 7/1/2011-60/30/2015 Last Revised 7/13/11
Page 1 of 2

Part B: Vehicle Maintenance Activity Monitoring Requirements for facilities using > 55 gal of new motor oil/month — averaged over a calendar year.
Qutfall
No.
Date Sample
Collected 1
(mo/dd/yr)
pH
(Standard
Units)
TPH using method
1664A SGT-HEM
(mg/L)
Total Suspended
Solids
(mg/L)
Event
Duration
(minutes)
Total
a
Rainfall
(in)
New Motor Oil
Usage
(gal/month)
In Tier 2
Monthly
Monitoring?
(y/n)
tf of Months
in Tier 2
Sampling
6-92
15
1002'
-
-
-
-
HAS YOUR FACILITY HAD 4 OR MORE BENCHMARK EXCEEDENCES AT ANY ONE OUTFALL (INCLUDING VEHICLE MAINTENANCE)? YES ❑ NO
HAVE YOU CONTACTED THE REGION? YES ❑ NO
REGIONAL OFFICE CONTACT NAME:
Mail Orieinal and one conv of this DMR (including all "No Flow" & "No Discharge" reports) within 30 days of receipt of sample (or at end of monitoring period
in case of ""No Flow") to:
Division of Water Quality
Attn: DWQ Central Files
1617 Mail Service Center
Raleigh, North Carolina 27699-1617
YOU MUST SIGN THIS CERTIFICATION FOR ANY INFORMATION REPORTED.
"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.
am aware that ther� significant penalties for submitting false information, including the possibility of fines and imprisonment for knowing violations.
12/29/2014
(Signature of Permittee)
Permit Date: 7/1/2011-60/30/2015
(Date)
Last Revised 7/13/11
Page 2 of 2

Stormwater Discharge Outfall (SDO)
Qualitative Monitoring Report
For guidance on filling out this form, please visit: httn://h2o.enr.state.nc.us/su/Forms_Documents.htm#miscforms
1 4 0 2 1 8
Permit No.: N/CI_I_I 1 l l l l or Certificate of Coverage No.: N/C/GI I_l_l_l_I /
Facility Name: Thomas Concrete of Carolina- Durham Plant
County: Durham Phone No. (919) 5 9 8- 0 4 5 6
Inspector: Susan Bostian
Date of Inspection: 0 9 / 8 / 14
Time of Inspection: 1000
Total Event Precipitation (inches): 1.00
Was this a Representative Storm Event? (See information below) ® Yes ❑ No
Please check your permit to verify if Qualitative Monitoring must be performed during a representative
storm event (requirements vary).
A "Representative Storm Event" is a storm event that measures greater than 0.1 inches of rainfall and that
is preceded by at least 72 hours Q days) 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.
By this signature, I certify that this report is accurate and complete to the best of my knowledge:
(Signature of Permittee or Designee)
1. Outfall Description:
Outfall No. Q1 Structure (pipe, ditch, etc.) Weir Outlet
Receiving Stream: Third Fork Creek Branch
Describe the industrial activities that occur within the outfall drainage area: Bulk Storage of
raw materials and petroleum, wastewater treatment
2. Color: Describe the color of the discharge using basic colors (red, brown, blue, etc.) and tint
(light, medium, dark) as descriptors: clear
3. Odor: Describe any distinct odors that the discharge may have (i.e., smells strongly of oil, weak
chlorine odor, etc.): No distinctive odor
Page 1 of 2
S W U-242-1 l 2608

4. Clarity: Choose the number which best describes the clarity of the discharge, where 1 is clear
and 5 is very cloudy:
O2 3 4 5
5. Floating Solids: Choose the number which best describes the amount of floating solids in the
stormwater discharge, where I is no solids and 5 is the surface covered with floating solids:
O 2 3 4 5
6. Suspended Solids: Choose the number which best describes the amount of suspended solids in
the stormwater discharge, where 1 is no solids and 5 is extremely muddy:
(D 2 3 4 5
7. Is there any foam in the stormwater discharge? Yes No
S. Is there an oil sheen in the stormwater discharge? Yes No
9. Is there evidence of erosion or deposition at the outfall? Yes No
10. Other Obvious Indicators of Stormwater Pollution:
List and describe pH (field -measured): 8.56
Note: Low clarity, high solids, and/or the presence of foam, oil sheen, or erosion/deposition may be
indicative of pollutant exposure. These conditions warrant further investigation.
Page 2 of 2
SWU-242-112608

PROCESS WASTEWATER — Quarterly Discharge Monitoring Report
GENERAL PERMIT No. NCG140000
CERTIFICATE OF COVERAGE NO. NCG140347
FACILITY NAME: _Thomas Concrete of Carolina- Fuquay Varina Plant
PERSON COLLECTING SAMPLES: Susan Bostian
CERTIFIED LABORATORY:_ESC
Lab # ENV375
Lab #
LIMIT VIOLATIONS? YES ❑ NO
Part A: Wastewater Monitoring Requirements
SAMPLE COLLECTION YEAR: 2014
SAMPLE QUARTER: ❑Jul -Sept ®Oct -Dec
COUNTY: Harnett
PHONE NO. (_919 _)557-3144
ADD TO LISTSERVE? ❑YES ®NO EMAIL:
❑Jan -March ❑April -June
DISCHARGING TO CLASS: ®SA ❑HQW ❑PNA ❑Trout ❑Other
OPTIONAL INFO:
Outfall No.
Date Sample
Collected
(mm/dd/yr)
Type of Wastewater
z
(VE, RM, MD)
pH
(standard)
Total Suspended
Solids
(mg/L)
Settleable
Solids
(mL/L)
TPH usingDischarge
method 1664A
SGT-HEM6
(mg/L)
Duration
(minutes)
Total Flow
(gallons/day)'
-
-
-
6-93.4
303,5
53
(15)6
-
01
NO DISCHARGE
1 If wastewater systems have not discharged in this quarter— report "No Flow" or "No Discharge" here. Please make sure to mark the sample quarter above.
z Report the abbreviation for the type of Authorized Wastewater Discharges here: Vehicle and Equipment Cleaning (VE), Raw Material Stockpiles (RM), Mixing Drum
Cleanout (MD). Report more than one type if the waste -stream is commingled.
3If an effluent limit is exceeded twice in a row, the permittee is required to institute monthly monitoring for that parameter for six months, unless DWQ RO staff
notifies you to continue monitoring.
4 pH limits are 6-9 S.U. for wastewater discharges to freshwaters, and 6.8-8.5 S.U. for discharges to saltwaters.
5 TSS limits are 20 mg/L for wastewater discharges to HQW waters, 10 mg/L for Trout and PNA waters, and 30 mg/L for all other water classifications.
Permit Date:7/1/2010-06/30/2015
Last Revised 07/13/11
Page 1 of 2

6 Process wastewater discharges shall only be monitored for TPH when commingled with stormwater discharges from VMA areas. TPH does not have a limit for wastewater,
but instead is subject to benchmarks and provisions of Part IV, Section A, including the Tiered Response Action.
Flow rate can be measured continuously or calculated. Flow limits for wastewater discharges to HQW waters shall be set to 50% of the Summer 7Q10 Flow as per 15A
NCAC 02B .0224. Permittees who discharge wastewater to HQW waters shall obtain a Summer 7Q10 flow and report this information to DWQ. if the permittee cannot
obtain a Summer 7Q10 flow for the receiving waters at the discharge location, the permittee shall notify DWQ, and the DWQ Regional Office may require an annual flow
report on a case -by -case basis.
MAIL ORIGINAL AND ONE COPY OF THIS ANNUAL SUMMARY (INCLUDING ALL "NO FLOW "NO DISCHARGE-) WITHIN 30 DAYS OF RECEIPT OF SAMPLE (OR
AT END OF MONITORING PERIOD_ IN CASE OF "NO FLOW") TO:
Division of Water Quality
Attn: DWQ Central Files
1617 Mail Service Center
Raleigh, North Carolina 27699-1617
[phone]
YOU MUST SIGN THIS CERTIFICATION FOR ANY INFORMATION REPORTED:
"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
violations."
(Signature of Permittee)
Permit Date: 7/1/2010-06/30/2015
12/29/2014
(Date)
Last Revised 07/13/11
Page 2 of 2

PROCESS WASTEWATER — Quarterly Discharge Monitoring Report
GENERAL PERMIT NO. NCG140000
CERTIFICATE OF COVERAGE NO. NCG14140418
FACILITY NAME: _Thomas Concrete of Carolina- Knightdale Plant
PERSON COLLECTING SAMPLES: Click here to enter text.
CERTIFIED LABORATORY:_ESC Lab # ENV375
Lab #
LIMIT VIOLATIONS? YES ❑ NO
Part A: Wastewater Monitoring Requirements
SAMPLE COLLECTION YEAR: 2014
SAMPLE QUARTER: ❑Jul -Sept ®Oct -Dec
COUNTY: Harnett
PHONE NO. (_919 _)557-3144
ADD TO LISTSERVE? OYES ®NO EMAIL:_
Dian -March ❑April -June
DISCHARGING TO CLASS: ®SA ❑HQW ❑PNA ❑Trout ❑Other
OPTIONAL INFO:
Outfall No.
Date Sample
i
Collected
(mm/dd/yr)
Type of Wastewater
(VE, RM, MD)'
pH
(standard)
Total Suspended
Solids
(mg/L)
Settleable
Solids
(mL/L)
TPH usingDischarge
method 1664A
5GT-HEM'
(mg/L)
Duration
(minutes)
Total Flow
,
{gallons/dayj
-
-
-
6-93,4
303,5
53
(15)6
-
-
01
NO DISCHARGE
1 If wastewater systems have not discharged in this quarter — report "No Flow" or "No Discharge" here. Please make sure to mark the sample quarter above.
Z Report the abbreviation for the type of Authorized Wastewater Discharges here: Vehicle and Equipment Cleaning (VE), Raw Material Stockpiles (RM), Mixing Drum
Cleanout (MD). Report more than one type if the waste -stream is commingled.
3 V an effluent limit is exceeded twice in a row, the permittee is required to institute monthly monitoring for that parameter for six months, unless DWQ RO staff
notifies you to continue monitoring.
4 pH limits are 6-9 S.U. for wastewater discharges to freshwaters, and 6.8-8.5 S.U. for discharges to saltwaters.
5 TSS limits are 20 mg/L for wastewater discharges to HQW waters, 10 mg/L for Trout and PNA waters, and 30 mg/L for all other water classifications.
Permit Date: 7/1/2010-06/30/2015 Last Revised 07/13/11
Page 1 of 2

e Process wastewater discharges shall only be monitored for TPH when commingled with stormwater discharges from VMA areas. TPH does not have a limit for wastewater,
but instead is subject to benchmarks and provisions of Part IV, Section A, including the Tiered Response Action.
Flow rate can be measured continuously or calculated. Flow limits for wastewater discharges to HQW waters shall be set to 50% of the Summer 7Q10 Flow as per 15A
NCAC 02B .0224. Permittees who discharge wastewater to HQW waters shall obtain a Summer 7Q10 flow and report this information to DWQ. If the permittee cannot
obtain a Summer 7Q10 flow for the receiving waters at the discharge location, the permittee shall notify DWQ, and the DWQ Regional Office may require an annual flow
report on a case -by -case basis.
MAIL ORIGINAL AND ONE COPY OF THIS ANNUAL SUMMARY (INCLUDING ALL "NO FLOW", "NO DISCHARGE") WITHIN 30 DAYS OF RECEIPT OF SAMPLE (OR
AT END OF MONITORING PERIOD IN CASE OF "NO FLOW") TO:
Division of Water Quality
Attn: DWQ Central Files
1617 Mail Service Center
Raleigh, North Carolina 27699-1617
[phone]
YOU MUST SIGN THIS CERTIFICATION FOR ANY INFORMATION REPORTED:
"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
vinintinnc "
GP,
(Signature of Permittee)
Permit Date-. 7/1/2010-06/30/2015
12/29/2014
( Date)
Last Revised 07/13/11
Page 2 of 2

PROCESS WASTEWATER — Quarterly Discharge Monitoring Report
GENERAL PERMIT NO. NCG140000
CERTIFICATE OF COVERAGE NO. NCG140218
FACILITY NAME: _Thomas Concrete of Carolina- Durham Plant
PERSON COLLECTING SAMPLES: Susan Bostian
CERTIFIED LABORATORY:_ESC Lab # ENV375_
Lab #
LIMIT VIOLATIONS? YES ❑ NO
Part A: Wastewater Monitoring Requirements
SAMPLE COLLECTION YEAR: 2014
SAMPLE QUARTER: ®Jul -Sept ❑Oct -Dec ❑Jan -March ❑April -June
COUNTY: Durham
PHONE NO. (_919 _) 598-0456
ADD TO LISTSERVE? []YES ®NO EMAIL:
DISCHARGING TO CLASS: ®SA ❑HQW ❑PNA ❑Trout ❑Other
OPTIONAL INFO:
Outfall Na.
Date Sample
1
Collected
(mm/dd/yr)
Type of Wastewater
(VE, RM, MD)'
pH
(standard)
Total Suspended
Solids
(mg/L)
Settleable
Solids
(mL/L)
TPH usingDischarge
method 1664A
SGT-HEM'
(mg/L)
Duration
(minutes)
Total Flow
,
(gallons/day)
-
-
-
6-93.4
30315
53
(15)6
001,
07/22/14
VE, RM
8.97
19
<0.033
45
Total Flow:
4,790 gpd
Vttu
EA
r
F
LE
N
If wastewater systems have not discharged in this quarter — report "No Flow' or "No Discharge" here. Please make sure to mark the sample quarter above.
z Report the abbreviation for the type of Authorized Wastewater Discharges here: Vehicle and Equipment Cleaning (VE), Raw Material Stockpiles (RM), Mixing Drum
Cleanout (MD). Report more than one type if the waste -stream is commingled.
3If an effluent limit is exceeded twice in a row, the permittee is required to institute monthly monitoring for that parameter for six months, unless DWQ RO staff
notifies you to continue monitoring.
4 pH limits are 6-9 S.U. for wastewater discharges to freshwaters, and 6.8-8.5 S.U. for discharges to saltwaters.
Permit Date: 7/1/2010-06/30/2015 Last Revised 07/13/11
Page 1 of 2

5 TSS limits are 20 mg/L for wastewater discharges to HQW waters, 10 mg/L for Trout and PNA waters, and 30 mg/L for all other water classifications.
6 Process wastewater discharges shall only be monitored for TPH when commingled with stormwater discharges from VMA areas. TPH does not have a limit for wastewater,
but instead is subject to benchmarks and provisions of Part IV, Section A, including the Tiered Response Action.
Flow rate can be measured continuously or calculated. Flow limits for wastewater discharges to HQW waters shall be set to 50% of the Summer 7Q10 Flow as per 15A
NCAC 023 .0224. Permittees who discharge wastewater to HQW waters shall obtain a Summer 7Q10 flow and report this information to DWQ. If the permittee cannot
obtain a Summer 7Q10 flow for the receiving waters at the discharge location, the permittee shall notify DWQ, and the DWQ Regional Office may require an annual flow
report on a case -by -case basis.
MAIL ORIGINAL AND ONE COPY OF THIS ANNUAL SUMMARY (INCLUDING ALL "NO FLOW", "NO DISCHARGE") WITHIN 30 DAYS OF RECEIPT OF SAMPLE (OR
AT END OF MONITORING PERIOD IN CASE OF "NO FLOW") TO:
Division of Water Quality
Attn: DWQ Central Files
1617 Mail Service Center
Raleigh, North Carolina 27699-1617
[phone]
YOU MUST SIGN THIS CERTIFICATION FOR ANY INFORMATION REPORTED:
"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 tha ere are signific penalties for submitting false information, including the possibility of fines and imprisonment for knowing
violations �7 /
9/15/2014
(Signature of Permittee) (Date)
Permit Date: 7/1/2010-06/30/2015 L Last Revised 07/13/11
Page 2 of 2

STORMWATER DISCHARGE OUTFALL (SDO) - Semi -Annual MONITORING FORM
GENERAL PERMIT NO. NCG140000
CERTIFICATE OF COVERAGE NO. NCG140218
FACILITY NAME: Thomas Concrete of Carolina -Durham Plant
PERSON COLLECTING SAMPLES Susan Bostian
CERTIFIED LABORATORY ESC Lab # ENV 375_
Lab #
OPTIONAL INFO: August Monitoring event
Part A: Stormwater Monitoring Requirements
SAMPLE COLLECTION YEAR: 2014
SAMPLING PERIOD: ® July -December ❑ January -June
COUNTY Durham
PHONE NO. [phone]
ADD TO LISTSERVE? DYES ®NO EMAIL:
DISCHARGING TO CLASS: ®SA ❑HQW ❑PNA ❑Trout ❑Other
Outfall No.
Date Sample
Collected
(mo/dd/yr OR
i
NO FLOW)
pH
(Standard
Units)
TSS
m
�g/L)
Event
Duration
(minutes)
Total
a
Rainfall
(in)
In Tier 2
Monthly
Monitoring.
(y/n)
# of Months in Tier
2
2 Sampling
-
-
6-9
100-
001
NO DISCHARGE
y
6
rn tam
SEP,16
?014
QZKITC
DWR SECTIoN
1 If "NO FLOW" or "NO DISCHARGE, Enter "NO FLOW" or "NO DISCHARGE" for each outfall here. Please make sure to mark the sample period above.
2 If a value is in excess of the benchmark, or outside the benchmark range (for pH), you must implement the Tier 1 or Tier 2 responses in the General Permit. Tier 2
Monthly sampling shall be done until 3 consecutive samples are below the benchmark or within the benchmark range.
3 TSS benchmark values are 100 mg/I, except when discharging to ORW, HQW, Trout, and PNA waters where they are 50 mg/l.
°for each sampled measurable storm event the total precipitation must be recorded using data from an on -site rain gauge.
Permit Date: 7/1/2011-60/30/2015 Last Revised 7/13/11
Page 1 of 2

Part B: Vehicle Maintenance Activity Monitoring Requirements for facilities using > 55 gal of new motor oil/month — averaged over a calendar year.
Outfall
No.
Date Sample
Collected
{mo/dd/yrjl
pH
(Standard
Units)
TPH using method
1664A 5GT-HEM
(mg/L)
Total Suspended
Solids
(mg/L)
Event
Duration
(minutes)
Total
Rainfall'
(in)
New Motor Oil
Usage
(gal/month)
In Tier 2
Monthly
Monitoring?
{y/n}
d of Months
in Tier 2
i
Sampling
6-9 215
100 '
-
-
-
-
-
HAS YOUR FACILITY HAD 4 OR MORE BENCHMARK EXCEEDENCES AT ANY ONE OUTFALL (INCLUDING VEHICLE MAINTENANCE)? YES ❑ NO
HAVE YOU CONTACTED THE REGION? YES ❑ NO
REGIONAL OFFICE CONTACT NAME:
Mail Orieinal and one coov of this DMR {including all "No Flow" & "No Discharee" reports) within 30 days of receipt of sample for at end of monitorinp, period
in case of "No Flow") to:
Division of Water Quality
Attn: DWQ Central Files
1617 Mail Service Center
Raleigh, North Carolina 27699-1617
YOU MUST SIGN THIS CERTIFICATION FOR ANY INFORMATION REPORTED:
"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 respo ible for gather' g he information, the information submitted is, to the best of my knowledge and belief, true, accurate, and complete.
am aw t#et there are sl icantIti for ubmi g f irse information, including the possibility of fines and imprisonment for knowing violations."
A-4 9/15/2014
)Signature of Permittee} (Date)
Permit Date: 7/1/2011-60/30/2015 Last Revised 7/13/11
Page 2 of 2

STORMWATER DISCHARGE OUTFALL (SDO) - Semi -Annual MONITORING FORM
GENERAL PERMIT No. NCG140000
CERTIFICATE OF COVERAGE NO. NCG140218
FACILITY NAME: Thomas Concrete of Carolina -Durham Plant
PERSON COLLECTING SAMPLES Susan Bostian
CERTIFIED LABORATORY ESC Lab # ENV 375_
Lab #
OPTIONAL INFO: July Monitoring event_
Part A: Stormwater Monitoring Requirements
SAMPLE COLLECTION YEAR: 2014
SAMPLING PERIOD: ® July -December ❑ January -June
COUNTY Durham
PHONE NO. [phone]
ADD TO LISTSERVE? ❑YES ®NO EMAIL:
DISCHARGING TO CLASS: ®SA ❑HCZW ❑PNA ❑Trout
❑Other,
Outfall No.
Date Sample
Collected
(ma/dd/yr OR
NO FLOW)1
pH
(Standard
Units}
T55
[mg/L}
Event
Duration
(minutes)
Total
a
Rainfall
(in)
In Tier 2
Monthly
Monitoring?
(y/n)
# of Months in Tier
x
2 Sampling
-
-
6-9
100 '
-
-
-
-
001
07/22/2014
8.84
19
45
0.25
y
5
RtULIVED
FILES
SEISTION
1 If "NO FLOW" or "NO DISCHARGE, Enter "NO FLOW" or "NO DISCHARGE" for each outfall here. Please make sure to mark the sample period above.
Z If a value is in excess of the benchmark, or outside the benchmark range (for pH), you must implement the Tier 1 or Tier 2 responses in the General Permit. Tier 2
Monthly sampling shall be done until 3 consecutive samples are below the benchmark or within the benchmark range.
3 TSS benchmark values are 100 mg/l, except when discharging to ORW, HOW, Trout, and PNA waters where they are 50 mg/l.
° For each sampled measurable storm event the total precipitation must be recorded using data from an on -site rain gauge.
Permit Date: 7/1/2011-60/30/2015 Last Revised 7/13/11
Page 1 of 2

Part B: Vehicle Maintenance Activity Monitoring Requirements for facilities using > 55 gal of new motor oil/month — averaged over a calendar year.
Outfall
No.
Date Sample
Collected
(mo/dd/yr)1
pH
(Standard
Units)
TPH using method
1664A SGT-HEM
(mg/L)
Total Suspended
Solids
(mg/L)
Event
Duration
(minutes)
Total
Rainfall°
(in)
New Motor Oil
Usage
(gal/month)
In Tier 2
Monthly
Monitoring?
(y/n)
# of Months
in Tier 2
Samplingz
6-9
15
100 '
-
-
-
-
-
HAS YOUR FACILITY HAD 4 OR MORE BENCHMARK EXCEEDENCES AT ANY ONE OUTFALL (INCLUDING VEHICLE MAINTENANCE)? YES ❑ NO
HAVE YOU CONTACTED THE REGION? YES ❑ NO
REGIONAL OFFICE CONTACT NAME:
Mail Original and one copy of this DMR (including all "No Flow" & "No Discharge" reports) within 30 days of receipt of sample (or at end of monitoring period
in case of "No Flow") to:
Division of Water Quality
Attn: DWQ Central Files
1617 Mail Service Center
Raleigh, North Carolina 27699-1617
YOU MUST SIGN THIS CERTIFICATION FOR ANY INFORMATION REPORTED.
"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 res nsible for gath g the information, the information submitted is, to the best of my knowledge and belief, true, accurate, and complete. I
a e t at there are ' nific>iat-penal ies r submiyting fplse information, including the possibility of fines and imprisonment for knowing violations."
(Signature of Permittee)
9/15/2014
(Date)
Permit Date: 7/1/2011-60/30/2015
Last Revised 7/13/11
Page 2 of 2

Stormwater Discharge Outfall (SDO)
Qualitative Monitoring Report
For guidance on filling out this form, please visit: litty://h2o.enr.st ite.iic.iis/su/Forms Dociinients.htni#ntiscfornis
1 4 0 2 1 8
Permit No.: iNICI—/ 1�1�1 1 1_I or Certificate of Coverage No.: NIC/GI_I_I 1 I l 1
Facility Name: Thomas Concrete of Carolina- Durham Plant
County: Durham Phone No. (919) 5 98 - 04 56
Inspector: Susan Bostian
Date of Inspection: 0 7 / 2 2f 14
Time of Inspection: 1425
Total Event Precipitation (inches):
0.25
Was this a Representative Storm Event? (See information below) ® Yes ❑ No
Please check your permit to verify if Qualitative Monitoring must be performed during a representative
storm event (requirements vary).
A "Representative Storm Event" is a storm event that measures greater than 0.1 inches of rainfall and that
is preceded by at least 72 hours (3 days) 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.
By this signature, I certify that this report is accurate and complete to the best of my knowledge:
(Signature of Permittee or Designee)
1. Outfall Description:
Outfall No. 01 Structure (pipe, ditch, etc.) Weir Outlet
Receiving Stream: Third Fork Creek Branch
Describe the industrial activities that occur within the outfall drainage area: Bulk Storage of
raw materials and iDetroleum, wastewater treatment
2. Color: Describe the color of the discharge using basic colors (red, brown, blue, etc.) and tint
(light, medium, dark) as descriptors: _ Tii qht tan tint
3. Odor: Describe any distinct odors that the discharge may have (i.e., smells strongly of oil, weak
chlorine odor, etc.): No distinctive odor
Page I of 2
S WU-242-112608

r
4. Clarity: Choose the number which best describes the clarity of the discharge, where 1 is clear
and 5 is very cloudy:
1 O 3 4 5
5. Floating Solids: Choose the number which best describes the amount of floating solids in the
stormwater discharge, where 1 is no solids and 5 is the surface covered with floating solids:
O 2 3 4 5
6. Suspended Solids: Choose the number which best describes the amount of suspended solids in
the stormwater discharge, where I is no solids and 5 is extremely muddy:
O2 3 4 5
7. Is there any foam in the stormwater discharge? Yes No
S. Is there an oil sheen in the stormwater discharge? Yes No
9. Is there evidence of erosion or deposition at the outfall? Yes No
10. Other Obvious Indicators of Stormwater Pollution:
List and describe pH (field -measured) . 8.84
Note: Low clarity, high solids, and/or the presence of foam, oil sheen, or erosion/deposition may be
indicative of pollutant exposure. These conditions warrant further investigation.
Page 2 of 2
SWU-242-1 12608

STORMWATER DISCHARGE OUTFALL (SDO) - Semi -Annual MONITORING FORM
GENERAL PERMIT NO. NCG140000
CERTIFICATE OF COVERAGE NO..NCG140218
FACILITY NAME: Thomas Concrete of Carolina -Durham Plant
PERSON COLLECTING SAMPLES Phillip Jones
CERTIFIED LABORATORY ESC Lab # ENV 375 Lab #
OPTIONAL INFO: May Monitoring event
Part A: Stormwater Monitoring Requirements
RECEIVED
JAL o l 2014
SAMPLE COLLECTION YEAR: 2014
SAMPLING PERIOD: ❑ July -December ® January -June CENTRAL FILEr-
COUNTY Durham DVVQIBOC
PHONE NO. [phone]
ADD TO LISTSERVE? ❑YES ®NO EMAIL:
DISCHARGING TO CLASS: ®SA ❑HQW ❑PNA ❑Trout ❑Other
Outfall No.
Date Sample
Collected
Imo/dd/yr OR
NO FLOW)1
pH
(Standard
Units)
TSS
(mg/L)
Event
Duration
(minutes)
Total a
Rainfall
(in)
In Tier 2
Monthly
Monitoring?
(y/n)
# of Months in Tier
2
2 Sampling
-
-
6-9
100 '11
-
-
-
001
NO DISCHARGE
y
2
If "NO FLOW" or "NO DISCHARGE, Enter "NO FLOW" or "NO DISCHARGE" for each outfall here. Please make sure to mark the sample period above.
2 If a value is in excess of the benchmark, or outside the benchmark range (for pH), you must implement the Tier 1 or Tier 2 responses in the General Permit. Tier 2
Monthly sampling shall be done until 3 consecutive samples are below the benchmark or within the benchmark range.
a TSS benchmark values are 100 mg/I, except when discharging to ORW, HQW, Trout, and PNA waters where they are 50 mg/l.
"For each sampled measurable storm event the total precipitation must be recorded using data from an on -site rain gauge.
Permit Date:7/1/2011-60/30/2015
Last Revised 7/13/11
Page 1 of 2

9
Part B: Vehicle Maintenance Activity Monitoring Requirements for facilities using > 55 gal of new motor oil/month -- averaged over a calendar year.
Outfall
No.
Date Sample
Collected 1
(mo/dd/yr)
pH
(Standard
Units)
TPH using method
1664A SGT-HEM
(mg/L)
Total Suspended
Solids
(mg/L)
Event
Duration
(minutes)
Total
a
RainfalE
(in)
New Motor Oil
Usage
(gal/month)
In Tier 2
Monthly
Monitoring?
(y/n)
# of Months
in Tier 2
Sampling2
6-9
15
1002,3
-
-
-
-
HAS YOUR FACILITY HAD 4 OR MORE BENCHMARK EXCEEDENCES AT ANY ONE OUTFALL (INCLUDING VEHICLE MAINTENANCE)? YES ❑ NO
HAVE YOU CONTACTED THE REGION? YES ❑ NO
REGIONAL OFFICE CONTACT NAME:
Mail Ori21nai and one copy of this DMR (including all "No Flow" & "No Discharge" reports) within 30 days of receipt of sample for at end of monitoring period
in case of "No Flow") to:
Division of Water Quality
Attn: DWQCentral Files
1617 Mail Service Center
Raleigh, North Carolina 27699-1617
YOU MUST SIGN THIS CERTIFICATION FOR ANY INFORMATION REPORTED:
"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_g are that th fte are �ignifican;.;a?naltles for�ubr*tting false information, including the possibility of fines and imprisonment for knowing violations."
re of Permittee)
Permit Date: 7/1/2011-60/30/2015
6/30/2014
(Date)
Last Revised 7/13/11
Page 2 of 2

STORMWATER DISCHARGE OUTFALL (SDO) - Semi -Annual MONITORING FORM
RECEIVED
GENERAL PERMIT NO. NCG140000
CERTIFICATE OF COVERAGE NO. NCG140218
FACILITY NAME: Thomas Concrete of Carolina -Durham Plant
PERSON COLLECTING SAMPLES Phillip Jones
CERTIFIED LABORATORY ESC Lab # ENV 375_
Lab #
OPTIONAL INFO: April Monitoring event
Part A: Stormwater Monitoring Requirements
SAMPLE COLLECTION YEAR: 2014
SAMPLING PERIOD: ❑ July -December ® January -June
COUNTY Durham
PHONE NO. [phone]
ADD TO LISTSERVE? DYES ®NO EMAIL:
DISCHARGING TO CLASS: ®SA ❑HQW ❑PNA
JUL 07 Z014
CEDWQIBOIGES
❑Trout ❑Other
Outfall No.
Date Sample
Collected
(mo/dd/yr OR
NO FLOW)'
PH
(Standard
Units)
TSS
(mg/L)
Event
Duration
(minutes)
Total
Rainfall d
(in)
In Tier 2
Monthly
Monitoring?
(y/n)
# of Months in Tier
2 Samplingz
-
-
6-9
100 ,
-
-
-
-
001
NO DISCHARGE
y
2
If "NO FLOW" or "NO DISCHARGE, Enter "NO FLOW" or "NO DISCHARGE" for each outfall here. Please make sure to mark the sample period above.
z If a value is in excess of the benchmark, or outside the benchmark range (for pH), you must implement the Tier 1 or Tier 2 responses in the General Permit. Tier 2
Monthly sampling shall be done until 3 consecutive samples are below the benchmark or within the benchmark range.
3 TSS benchmark values are 100 mg/l, except when discharging to ORW, HQW, Trout, and PNA waters where they are 50 mg/I.
° For each sampled measurable storm event the total precipitation must be recorded using data from an on -site rain gauge.
Permit Date: 7/1/2011-60/30/2015 Last Revised 7/13/11
Page 1 of 2

Part 9: Vehicle Maintenance Activity Monitoring Requirements for facilities using > 55 gal of new motor oil/month -- averaged over a calendar year.
Outfall
No.
Date Sample
Collected
(mo/dd/yr)1
PH
(Standard
Units)
TPH using method
1664A SGT-HEM
(mg/L)
Total Suspended
Solids
(mg/L)
Event
Duration
(minutes)
Total
a
Rainfall
(in)
New Motor Oil
Usage
(gal/month)
In Tier Z
Monthly
Monitoring?
(y/n)
# of Months
in Tier 2
2
Sampling
6-9
15
100 '
-
-
-
-
HAS YOUR FACILITY HAD 4 OR MORE BENCHMARK EXCEEDENCES AT ANY ONE OUTFALL (INCLUDING VEHICLE MAINTENANCE)? YES ❑ NO
HAVE YOU CONTACTED THE REGION? YES ❑ NO
REGIONAL OFFICE CONTACT NAME:
Mail Orieinai and one coot/ of this DMR (includine all "No Flow" & "No Discharge" reports) within 30 days of receipt of sample for at end of monitoring period
in case of "No Flow") to:
Division of Water Quality
Attn: DWQ Central Files
1617 Mail Service Center
Raleigh, North Carolina 27699-1617
YOU MUST SIGN THIS CERTIFIC4TION FOR ANY INFORMATION REPORTED:
"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 %here are signifiyant penalties for submitting false information, including the possibility of fines and imprisonment for knowing violations."
(Signature of Permittee)
Permit Date:7/1/2011-60/30/2015
6/30/2014
(Date)
Last Revised 7/13/11
Page 2 of 2

PR 0 -9 2014
��+ ware
1 QSANLST WA[ITy
Stormwater Discharge Outfall (SDO)
Qualitative Monitoring Report
For guidance on filling out this form, please visit: hitp://h2o.enr.state.nc.us/su/Forms Documents. htm#miscforms
Permit No.: N/C/_/ 1 l�l / l _I or Certificate of Coverage No.: N/C/GI 1/ 4/ 0/ 2i
Facility Name: Thomas Concrete of Carolina-- Durham Plant
County: Durham Phone No. (919) 5 9 8 - 04 5 6
Inspector: Susan Bostian
Date of Inspection: 0 3 f 2 5 f 14
Time of Inspection: 1445
Total Event Precipitation (inches):
0.10
Was this a Representative Storm Event? (See information below) ® Yes ❑ No
Please check your permit to verify if Qualitative Monitoring must be performed during a representative
storm event (requirements vary).
A "Representative Storm Event" is a storm event that measures greater than 0.1 inches of rainfall and that
is preceded by at least 72 hours (3 days) 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.
By this signature I certify that this report is accurate and complete to the best of my knowledge:
�Snn, a F ,C"'Ito
(Signature of Permittee or Designee)
1. Outfall Description:
Outfall No. 01 Structure (pipe, ditch, etc.) Weir Outlet
Receiving Stream: Third Fork Creek Branch
Describe the industrial activities that occur within the outfall drainage area: Bulk Storage of
raw materials and petroleum, wastewater treatment
2. Color: Describe the color of the discharge using basic colors (red, brown, blue, etc.) and tint
(light, medium, dark) as descriptors: Light Green
3. Odor: Describe any distinct odors that the discharge may have (i.e., smells strongly of oil, weak
chlorine odor, etc.): No distinctive odor
Page 1 of 2
SWOT-242-112608

4. Clarity: Choose the number which best describes the clarity of the discharge, where 1 is clear
and 5 is very cloudy:
O2 3 4 5
5. Floating Solids: Choose the number which best describes the amount of floating solids in the
stormwater discharge, where 1 is no solids and 5 is the surface covered with floating solids:
O2 3 4 5
6. Suspended Solids: Choose the number which best describes the amount of suspended solids in
the stormwatcr discharge, where 1 is no solids and 5 is extremely muddy:
lO 2 3 4 5
7. Is there any foam in the stormwater discharge? es No
S. Is there an oil sheen in the stormwater discharge? Yes No
9. Is there evidence of erosion or deposition at the outfall? Yes No
10. Other Obvious Indicators of Stormwater Pollution:
List and describe pH (field -measured) : 10.40
Note: Low clarity, high solids, and/or the presence of foam, oil sheen, or erosion/deposition maybe
indicative of pollutant exposure. These conditions warrant further investigation.
Page 2 of 2
SM(U-242-112608

STORMWATER DISCHARGE OUTFALL (SDO) - Semi -Annual MONITORING FORM
GENERAL PERMIT NO. NCG140000
CERTIFICATE OF COVERAGE NO. NCG1,40218
FACILITY NAME: Thomas Concrete of Carolina -Durham Plant
PERSON COLLECTING SAMPLES Susan Bostian
CERTIFIED LABORATORY ESC lab # ENV 375_
Lab #
OPTIONAL INFO:
Part A: Stormwater MonitorinR Requirements
SAMPLE COLLECTION YEAR: 2014
SAMPLING PERIOD: ❑ July -December ® January -June
COUNTY Durham
PHONE NO. [phone]
ADD TO LISTSERVE? []YES ®NO EMAIL:
DISCHARGING TO CLASS: ®SA ❑HQW ❑PNA [-]Trout
[]Other
Outfall No.
Date Sample
Collected
(mo/dd/yr OR
NO FLOW)'
pH
(Standard
Units
TSS
(mg/L)
Event
Duration
[minutes}
Total
Rainfall'
(in)
In Tier 2
Monthly
y
Monitoring?
(y/n)
# of Months In Tier
2 Sampling'
-
6-92
1002.1
-
-
-
-
001
03/25/14
10.30
13
60
0.10
y
3
1 If "NO FLOW" or "NO DISCHARGE, Enter "NO FLOW" or "NO DISCHARGE" for each outfall here. Please make sure to mark the sample period above.
2 If a value is in excess of the benchmark, or outside the benchmark range (for pH), you must implement the Tier 1 or Tier 2 responses in the General Permit. Tier 2
Monthly sampling shall be done until 3 consecutive samples are below the benchmark or within the benchmark range.
3 TSS benchmark values are 100 mg/l, except when discharging to ORW, HOW, Trout, and RNA waters where they are 50 mg/l.
"For each sampled measurable storm event the total precipitation must be recorded using data from an on -site rain gauge.
Permit Date: 7/1/2011-60/30/2015 Last Revised 7/13/11
Page 1 of 2

Part 8: Vehicle Maintenance Activity Monitoring Requirements for facilities using > 55 gal of new motor oil/month — averaged over a calendar year.
Outfall
No.
Date Sample
Collected
(mo/dd/yr)l
pH
(Standard
Units)
TPH using method
1564A SGT-HEM
(mg/L)
Total Suspended
Solids
(mg/L)
Event
Duration
(minutes)
Total
Rainfall o
(In)
New Motor Oil
Usage
(gal/month)
In Tier 2
Monthly
Monitoring?
(y/n)
# of Months
in Tier 2
Sampling'
6-9'
1s'
1002•3
-
-
-
-
-
HAS YOUR FACILITY HAD 4 OR MORE BENCHMARK EXCEEDENCES AT ANY ONE OUTFALL (INCLUDING VEHICLE MAINTENANCE)? YES ❑ NO
HAVE YOU CONTACTED THE REGION? YES [:]NO
REGIONAL OFFICE CONTACT NAME:
Mail Original and one coov of this DMR Uncludins all "No Flow" & "No Discharee" reoorts) within 30 days of receipt of samole (or at end of monitoring period
in case of "No Flow") to:
Division of Water Quality
Attn: DWQ Central Files
1617 Mail Service Center
Raleigh, North Carolina 27699-1617
YOU MUST SIGN THIS cERTIFICATION FOR ANY INFORMATION REPORTED:
"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.
am aware that tPere are significant penalt s for syyb�mitting false information, including the possibility of fines and imprisonment for knowing violations."
(Signature of Permittee) (Date)
Permit Date: 7/1/2011-60/30/2015 Last Revised 7/13/11
Page 2 of 2

r THOMAS
4(t>THE CONCRETE SPECIALISTS -
ISO 9001 A. 14001 CERTIFIED
2500 Cumberland Pkwy.
Suite 200
Atlanta, Ga 30339
770.431.3300
Mr. Butler,
Please accept this signature authorization:
Sam Crawford, (Raleigh Division's Technical Services Director, and Environmental Management
Representative) has been authorized by Thomas Concrete Industries, Inc. to sign all documents submitted by
us, or our environmental representative (Dunkleee & Dunham), to the North Carolina Department of
Environment, and Natural Resources (NCDENR).
Should you have any questions regarding this, please contact Allen Burch (TCI Environmental Manager) at
404.391.0693.
IBest Regards,
Bill Davis
COO, Thomas Concrete Industries, Inc.
2500 Cumberland Pkwy, N,E., Suite 200
Atlanta, Ga. 30339