NCG140251_2023 DMR_20230706

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. NCG14 0251 Person Collecting Samples:Jonathan Murphrey
Facility Name: Raleigh RDU Facility Laboratory Name: Eurofins
Facility County: Laboratory Cert. No.: 269
Discharge during this period:II Yes ❑ No (if no,skip to signature and date)
Has your facility implemented mandatory Tier response actions for any benchmark exceedances?iI Yes ❑ No
If so,which Tier(I, II,or III)?
A copy of this DMR has been uploaded electronically via Yes ❑ No
Date Uploaded:
Part A:Analytical Monitoring Requirements for Outfalls with Industrial Activities—Effluent Limits in
Parameter Parameter Outfall Outfail Outfall Outfall Outfall
Code
N/A Receiving Stream Class B; NSW
N/A Date Sample Collected MM/DD/YYYY 06/07/2023
82220 Daily Flow Rate in cfs(50%of7Q10
for HQW/ORW)
C0530 TSS in mg/L(30,20,or 10*) 40.4
00545 Settleable Solids in HQW,ORW,SA, <O.
SB,Tr&PNA p myy
00400 pH in standard units(6.0-9.0 8.8
freshwater,6.8-8.5 saltwater) _
Non-Polar Oil&Grease in mg/L .
00552 u__�...r._
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 .All other water classifications have a benchmark of 30 mg/L.
Notes(optional):TSsmeasured 40A men.which is over the 30 mgll permit benchmark;all other sampling parameters were well below permit benchmarks.including Turbidity which was 20 NTU and wee below the 50 NTU avowed;ACTION PLAN:Measures being taken to add stone
"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 are significant penalties for submitting false information, including the possibility of fines and imprisonment for
knowing violations."
Tracy E. Davis 3 PE Digitally signed by Tracy E. Davis, PE r
Date:2023.06.22 15:5 .02-04'0 ' 1111/ 1
Signature of Permittee or Delegated Authorized Individual Date

Carolina Sunrock—RDU Concrete eDMR NCG140251 for WW Sample Taken Q2 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 June 7, 2023 during a 0.25+" rainfall event was tested to be 40.4 mg/I in
exceedance of the process water benchmark of 30 mg/I for TSS.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 generated onsite from product
recycling activities,truck traffic and plant wash down into our concrete weir and subsequently to our
SW Pond could be contributing to this elevated TSS reading; another contributing factor could be algae
build up in our SW Pond
ACTION PLAN: 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,add stone
throughout the yard to reduce the generation and transport of sediments,treat algae in the SW Pond,
and increase the frequency of our concrete weir cleanouts to reduce TSS in the SW Pond.This action
plan will be implemented on an ongoing basis to reduce TSS levels and keep them below the benchmark
limits.