NCG140251_2023 DMR_20230421

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.
1
Certificate of Coverage No. NCG140251 Person Collecting Samples:Nicholas Murphrey
Facility Name: Carolina Sunrock-RDU Concrete Laboratory Name: Eurofins
Facility County: Wake Laboratory Cert.No.: 269
Discharge during this period:❑■ Yes ❑ No (if no,skip to signature and date)
Has your facility implemented mandatory Tier response actions for any benchmark exceedances? ■❑Yes ❑ No
If so,which Tier(I, II,or Ill)?
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 B; NSW _ f —
N/A Date Sample Collected MM/DD/YYYY 03/02/2023
82220 Daily Flow Rate in cfs(50%of 7Q10
—
for HQW/ORW) ,
C0530 TSS in mg/L(30,20,or 10*) 42.4
Settleable Solids in HQW,ORW,SA, 0-
00545 SB,Tr&PNA(5 mL/L)
00400 pH in standard units(6.0-9.0 p.2
freshwater,6.8-8.5 saltwater) O
Non-Polar Oil&Grease in mg/L(N/A. ■0
00552 but samples above 15 require tierer
responses)
" Outfalls to Outstanding Resource Waters(ORW),High Quality Waters(HQW)have a TSS limit of ,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 .
Notes(optional):TSS of sample taken onMarch 2.20234unng a 0.72 rainfall event was tested to be 42.4 moll in eaceedance of the process water permt limit All other parameters were WOW the benchmark limits.The noncompliant sample can be attnbuted to runoff from upstrear
"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 here are significant penalties for submitting false information,including the possibility of fines and imprisonment for
knowing v' la ions."
4/21/2023
Signature of t
ttee or Delegated Authorized Individual Date

Carolina Sunrock—RDU Concrete eDMR NCG140251 and RDU Asphalt eDMR NCG160246 for WW
Sample Taken Q1 2023 at Stormwater Pond Outfall 001
Action Plan to Reduce TSS Below Benchmark Limits in NPDES General Stormwater Permit (both plants
drain to this outfall):
TSS of sample taken on March 2, 2023 during a 0.72" rainfall event was tested to be 42.4 mg/I in
exceedance of the process water permit limit.All other parameters were below the benchmark limits.
The non-compliant sample can be attributed to runoff from upstream roads draining into our site
through our site exit carrying sediments and depositing them in our asphalt plant and concrete plant
areas. These sediments comingled with sediments from plant wash down into our concrete weir and
subsequently to our SW Pond could be contributing to this elevated TSS reading; our action plan is
underway to propose the installation of a new water bar/speed bump across our exit driveway to divert
offsite stormwater into the City's SW pipe under our site,as well as increase the frequency of our
concrete weir cleanouts to reduce TSS in the SW Pond.This action plan will be completed by the end of
Q2.