NCG140470_2023 DMR_20230907

NCDEQ Division of Energy,Mineral and Land Resources
Wastewater Discharge Monitoring Report(DMR) Form for NCG140000
Ready-Mixed Concrete
Click here for instructions
Complete,sign,scan and submit the DMR via the Stormwater NPDES Permit Data Monitoring Report(DMR) Upload form within
30 days of receiving sampling results. Mail the original,signed hard copy of the DMR to the appropriate DEMLR Regional Office.
Mailed in DMRs must contain an original wet signature. Electronic signatures will not be accepted for mailed in DMRs.This is a
requirement until the permittee has registered for eDMR for reporting.
Certificate of Coverage No. NCG140470 Person Collecting Samples:Nicholas Murphrey
Facility Name: Carolina Sunrock-Kittrell Concrete Laboratory Name: Eurofins
Facility County: Vance Laboratory Cert. No.: 269
Discharge during this period:Q Yes ❑ No (if no,skip to signature and date)
Has your facility implemented mandatory Tier response actions for any benchmark exceedances?Q Yes ❑ No
If so,which Tier(I, II,or III)?
A copy of this DMR has been uploaded electronically via https://edocs.deq.nc.gov/Forms/SW-DMR❑■ Yes ❑ No
Date Uploaded:
Part A:Analytical Monitoring Requirements for Outfalls with Industrial Activities—Effluent Limits in(Red)
Parameter Parameter Outfall Outfall Outfall Outfall Outfall
Code
N/A Receiving Stream Class WSIV;NSW
N/A Date Sample Collected MM/DD/YYYY 8/10/2023
82220 Daily Flow Rate in cfs(50%of 7Q10
for HQW/ORW)
C0530 TSS in mg/L(30,20,or 10*) 47.0
00545 Settleable Solids in HQW,ORW,SA,
SB,Tr&PNA(5 mL/L) 0
00400 pH in standard units(6.0-9.0 •^
freshwater,6.8-8.5 saltwater) y
Non-Polar Oil&Grease in mg/L(N/A, .0
00552 but samples above 15 require tiered3
responses)
* Outfalls to Outstanding Resource Waters(ORW),High Quality Waters(HOW)have a TSS limit of 20 mg/L,outfalls to Trout Waters(Tr)and
Primary Nursery Areas(PNA)have a TSS limit of 10 mg/L.All other water classifications have a benchmark of 30 mg/L.
Notes(optional):Primary cause of high TSS is algae buildup in SW Pond;action plan is to increase frequency of algae treatment
"I certify by my signature below, 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 a e significant penalties for submitting false information,including the possibility of fines and imprisonment for
knowing violatio s."
9/6/2023
Signature of P rm te or Delegated Authorized Individual Date

Carolina Sunrock—Kittrell Concrete eDMR NCG140470 for WW Sample Taken Q3 2023 at Stormwater
Pond Outfall 001
Action Plan to Reduce TSS below Benchmark Limits in NPDES General Stormwater Permit:
TSS of sample taken on August 10, 2023 during a 0.42" rainfall event was tested to be 47.0 mg/I in
exceedance of the process water benchmark of 30 mg/I for TSS. All other parameters were well below
the benchmark limits, including Turbidity(12 NTU) and Settleable Solids(0.5 mI/I), leading us to believe
that our TSS exceedance was not attributable to sediment deposition or churning of bottom sediments
in the Stormwater Pond.
We believe that the primary culprit behind this TSS exceedance is the presence of excess algae growing
in the pond, despite our regular treatments, because of continuously higher than normal temperatures.
Another factor that likely influenced our TSS level was that our pH treatment system was down from
July 17, 2023 until August 30, 2023 when lightning hit our plant and created a surge that damaged our
pH display that triggers the dosing of CO2 from our tank. We immediately pursued repair of the system
but a new display unit had to be ordered and installed to correct the problem. It took several weeks to
receive and install the new unit to get the system back online.The stormwater sample was taken August
10 when the unit had been down for two and a half weeks, allowing algae to grow untreated; however,
our pH was measured to be 7.9 and in compliance.
ACTION PLAN: Our action plan is underway to continue frequent algae treatments until the algae growth
is controlled/reduced such that our TSS can be maintained below the benchmark limits.We believe that
with our pH system back up and running and our pump circulating and treating pond water with CO2,
we will be able to expedite lowering the TSS levels in this pond.

PIEDMONT' bf1Cl3-145 Chad Hill Rd.
4 Raleigh,ivi:.27607
GEOLC'�' 13;919-854-9700 F:914-6.54-9532
////
www.piedmontgeotogic.com
SMART EARTH SOLUTIONS
August 18,2023
Mr.Tracy Davis
The Sunrock Group
200 Horizon Drive, Suite 100
Raleigh,North Carolina 27615
RE: Results of Stormwater Monitoring:August 10,2023 Event
Carolina Sunrock—Kittrell Concrete/Asphalt Facilities
NPDES Permits NCG140470&NCG160243
214 Sunrock Road,Kittrell,Vance County,North Carolina
Dear Tracy:
This letter presents the results of stormwater monitoring conducted August 10,2023 for the Carolina Sunrock
(Sunrock)facility referenced above in Vance County,North Carolina.The stormwater monitoring was conducted in
general accordance with National Pollutant Discharge Elimination System(NPDES)general industrial stormwater
permits NCG140470&NCG160243.One stormwater sample was collected from the facility outfall(Outfall-001)
for laboratory/field analysis and analyzed for the following.
• Total suspended solids(TSS)by Standard Method(SM)2540D;
• Settleable solids(SS)by SM 2540F;
• Non-polar oil and grease by EPA Method 1664B;
• Turbidity by EPA Method 180.1;and
• pH.
Laboratory reports of analysis for the stormwater sample are provided in Attachment 1 and summarized in the table
below.
Summarized Results of Laboratory Analysis: August 10,2023 Stormwater Monitoring Event
Analysis Sample Result Permit Benchmark Permit Benchmark
(NCG140470) (NCG160243)
TSS by SM 2540D 47.0 mg,'1. 30 mg/L 100 mg/L
SS by SM 2540F 0.500 mL/L 5 mL/L NA
Oil&grease by EPA Method 1664 3.0 J mg/L 15 mg/L 15 mg/L
Turbidity by EPA Method 180.1 12 NTU NA NA
pH 7.9 S.U. 6.0-9.0S.U. NA
NA=No permit benchmark established.
*J=Estimated concentration;above the laboratory method detection limit but below the reporting limit.

Results of Stormwater Monitoring: August 10,2023 Event
Carolina Sunrock—Kittrell Concrete/Asphalt Facilities
NPDES Permits NCG140470&NCG160243
August 18,2023
TSS, SS,oil&grease,and turbidity analyses were conducted by Eurofins of Savannah,Georgia(NC laboratory
certification no.269)and pH analysis was conducted by Piedmont Geologic(NC field laboratory certification no.
5560).A copy of the completed qualitative monitoring report,summarizing the results of a visual inspection
conducted on the stormwater discharge from Outfall-001,is provided in Attachment 2.No obvious indicators of
stormwater pollution were identified through visual monitoring. The measured TSS of the August 10,2023 sample
(47.0 mg/L)is above the associated permit benchmark of 30 mg/L for permit NCG14.
Thank you for providing Piedmont Geologic with this opportunity to provide services.If you have any questions,
please call.
Sincerely,
Jonatha,vvD. Maephrey
Jonathan D.Murphrey,P.G.
Staff Geologist
Attachment
PIEDMONT GEOLOGIC,P.G 2

Client Sample Results
Client: Piedmont Geologic P.C. Job ID:752-10406-1
Project/Site: Sunrock Kittrell Asphalt/Concrete
Client Sample ID: Outfall 001 Lab Sample ID: 752-10406-1
Date Collected:08/10/23 12:15 Matrix:Water
Date Received:08/10/23 14:44
General Chemistry
Analyte Result Qualifier RL MDL Unit D Prepared Analyzed Dil Fac
Oil&Grease(HEM)(1664B) 3.0 J 5.0 1.4 mg/L 08/14/23 11:27 08/14/23 18:59 1
Turbidity(EPA 180.1) 12 0.50 0.50 NTU 08/11/23 11:03 1 6
Total Suspended Solids(SM 47.0 6.25 6.25 mg/L 08/15/23 14:11 1
2540D)
Settleable Solids(SM 2540F) 0.500 0.100 0.100 mL/L 08/11/23 08:57 1
Eurofins Raleigh
Page 7 of 17 8/17/2023