Document 9J9Qok1g4QOD64ed4ybG2zy1q

NPDES ID: NCG140043 U.S. Environmental Protection Agency, Region 4 61 Forsyth Street SW, Atlanta, GA 30303 Water Compliance Inspection Report FACILITY DATA Effective Date: 07/01/2022 Expiration Date: 06/30/2027 Facility Name: Concrete Supply Company, LLC (CSC) - South Plant (Charlotte) SIC Code: 3273 / E / E2 Address: 400 Minute Lane, Charlotte, NC 28210 On-Site Representative: Adam Georgia Loren Wild Plant Lead Area Manager o: 704-527-1387 o: 704-309-4418 Responsible Official: Johnie Alexander, Environmental Manager Email: Johnie.Alexander@concretesupplyco.com Office: 704-372-2930 INSPECTION ENTRY DATES/TIMES Entry Date/Time: 01/13/2025 at 01:30 PM Exit Date/Time: 01/13/2025 at 03:15 PM NAMES OF STATE INSPECTORS Lily Kay Lily.Kay@deq.nc.gov Brett Saunders Brett.Saunders@deq.nc.gov AREAS EVALUATED DURING INSPECTION (Check those areas evaluated) X Permit X Self-Compliance Program Pretreatment X Records Compliance Schedule X Pollution Prevention X Facility Site Review Laboratory X Storm Water X Effluent/ Receiving Waters X Operations & Maintenance Combined Sewer Overflow Flow Measurement Sludge Handling/ Disposal Sanitary Sewer Overflow INSPECTION SUMMARY This was a joint EPA and NC DEQ stormwater Compliance Evaluation Inspection (CEI) focusing on the requirements of the North Carolina General Permit for Storm Water Discharges Associated with Industrial Activities (General Permit No. NCG140000). INSPECTOR SIGNATURE Digitally signed by JEREMY JEREMY JUDD JUDD Date: 2025.04.17 14:48:03 -04'00' Jeremy Judd, Environmental Engineer LONNIE DORN Digitally signed by LONNIE DORN Date: 2025.04.17 16:12:53 -04'00' Lonnie Dorn, Life Scientist AHMAD Digitally signed by AHMAD DROMGOOLE DROMGOOLE 09:50:05 -04'00' Date: 2025.04.18 Ahmad Dromgoole, Section Chief Waterways and Wetlands Enforcement Section OFFICE/PHONE NUMBER USEPA Region 4/ECAD-WEB-WWES 404-562-9505 USEPA Region 4/ECAD-WEB-WWES 706-355-8683 USEPA Region 4/ECAD-WEB-WWES 404-562-9212 Page 1 of 5 NPDES Industrial Stormwater Worksheet (North Carolina - General Permit No. NCG140000) GPS Coordinates Receiving Water(s) or MS4 Site Acreage Email on NOI 1. FACILITY LOCATION INFORMATION Latitude 35.1564488 N Unnamed Tributary to Kings Branch / Sugar Creek / Catawba River 7.5 acres Johnie.Alexander @concretesupply co.com SIC Code Date of NOI Longitude Discharge to 303(d) or TMDL waters 3272 / E / E2 -81.8827296 W No Weather Condition Sunny, clear 09/12/2022 2. SITE DESCRIPTION The CSC facility in Charlotte, NC is a ready-mix plant. The process includes a batch concrete process where a predetermined amount of aggregates, cement, fly ash, and admixture are mixed in a central mixer. The final products are then loaded from the central mixer directly into each individual concrete truck. All the runoff from the production area drains toward the east side of the facility and collects in a concrete ditch. Wastewater and stormwater from the ditch are pumped through a CO2 treatment system for pH adjustment prior to discharge via outfall #1. 3 STORMWATER POLLUTION PREVENTION PLAN (SWPPP) AND SUPPORTING DOCUMENTS PLAN TOPICS - Section B of Permit SWPPP available on-site SWPPP prepared by Chalam Pakala Engineering and Environmental Solutions SWPPP Certification Signature/Date YES Part B.18 X Part B.1 / Part J X Responsible Party / Pollution Prevention Team named in SWPPP Part B.1 X Section 7 of the SWPPP: Team consists of ENV Manager, District/Area Manager, and Plant Manager General Location Map Part B.2 X Site Map Part B.3 X Narrative Description of Industrial Processes Part B.4 Section 4.2 of the SWPPP: industrial facility is a central mix plant that consists of aggregate storage bins, 2 X cement silos, 1 fly ash silo, conveying equipment, and weighing equipment. Feasibility Study Part B.5 X Evaluation of Stormwater Outfalls Stormwater BMP Summary Section 10 of the SWPPP indicates the Pollution Measures and BMPs implemented at facility Page 2 of 5 Part B.6 X Part B.7 X NO N/E 3 STORMWATER POLLUTION PREVENTION PLAN (SWPPP) AND SUPPORTING DOCUMENTS PLAN TOPICS - Section B of Permit YES Secondary Containment Plan Part B.8 The facility provided a plan document for review by email on April 15, 2025 (after the inspection) X The facility does have a 6,000 gallon AST and a few 55-gallon drums stored onsite. Spill Prevention and Response Procedures Part B.9 Section 4.7 Oil and Other Storage Management, Section 11 Spill Response and Section 12 Reporting Spills are X documented in the SWPPP. Solvent Management Plan Part B.10 NO N/E The facility provided a plan document of certification indicating that a Solvent Management Plan is not X required for the facility for review by email on April 15, 2025 (after the inspection) Preventative Maintenance and Good Housekeeping Program Part B.11 X Section 10 of the SWPPP indicates Pollution Measures and BMPs implemented at facility Employee Training Part B.12 Documentation indicates training occurred on the following dates: 12/28/2021; 10/03/2022; 10/02/2023; and X 10/07/2024 Representative Outfall Status Part B.13 Annual SWPPP Review and Update Part B.14 SWPPP has been documented of having been reviewed and revised for the following dates: X 1025/2019; 3/12/2020; 12/15/2020; 10/1/2021; 10/13/2022; 02/16/2023; 04/09/2024; 10/22/2024; and 11/25/2024. Notice to Modify the SWPPP Part B.15 Facility has not received any notice to modify the SWPPP from NC DEQ OPERATIONAL REQUIREMENTS - Section C of Permit YES Operation and Maintenance of Treatment and Control Systems Part C.1 X Stormwater Control Measure Clean Out Polyacrylamides and Flocculants Part C.2 X Part C.3 PAMS and Flocculants shall be selected from the NC Division of Water Resources of approved PAMS/Flocculants list. Residuals Management Corrective Actions QUALITATIVE MONITORING OF STORMWATER DISCHARGES - Section D of Permit Visual Inspections Qualitative Monitoring Response ANALYTICAL MONITORING OF STORMWATER DISCHARGES - Section E of Permit Part C.3 X Part C.4 X YES Part D.1 X Part D.2 X YES X X NO N/E X NO N/E NO N/E Page 3 of 5 3 STORMWATER POLLUTION PREVENTION PLAN (SWPPP) AND SUPPORTING DOCUMENTS PLAN TOPICS - Section B of Permit Required Baseline Sampling Tier One Response - Status Tier Two Response - Status Tier Three Response - Status SUBMITTAL OF DISCHARGE MONITORING REPORTS - Section H of the Permit Qualitative Monitoring Reports Monitoring Report Retention OTHER OCCURENCES THAT MUST BE REPORTED - Section I of the Permit Visible Sediment deposition in a stream or wetland Oil Spills Documents indicate no history of oil spills or leaks. Hazardous Substances Anticipated bypasses Unanticipated bypasses Noncompliance with the conditions of the Permit YES Part E.1 X Part E.5 Part E.6 Part E.7 YES Part H.10 X Part H.11 X YES Part I Table 7 Part I Table 7 Part I Table 7 Part I Table 7 Part I Table 7 Part I Table 7 NO N/E X X X NO N/E NO N/E X X X X X X 4. FIELD EVALUATION & PLAN IMPLEMENTATION Pollutant Sources Loading/Unloading Area Note location, quantitative description, design issue, O&M deficiencies, and pollutants offsite Raw materials arrive by trucks. Aggregate and sand are stored in 3-sided concrete bins, while cement and fly ash are pneumatically pumped into silos. Outdoor Storage The 3-sided concrete bins for aggregate and sand were open to precipitation. Outdoor Manufacturing/ Processing Operations Treatment/Storage/Disposal Areas Sediment & Erosion Controls (BMPs) Not Applicable Storage and Disposal areas are located on site and open to precipitation. Observed minor dust control concerns/issues at the site. Observed minor sediment track out at the entrance / exit. Page 4 of 5 4. FIELD EVALUATION & PLAN IMPLEMENTATION Pollutant Sources Note location, quantitative description, design issue, O&M deficiencies, and pollutants offsite Spills / Leaks Handling / Good No evidence of spills or leaks were observed onsite. Housekeeping The facility is generally in good and orderly with regards to good housekeeping. 5. OUTFALL, STORMWATER DISCHARGE & RECEIVING WATER OBSERVATIONS OUTFALL, STORMWATER, DISCHARGE, & RECEIVING WATER Number & location of stormwater discharge(s)/outfall(s) consistent with SWP3 YES NO DESCRIPTION X One outfall was observed, as reflected in the SPPP. Evidence of off-site accumulation of pollutants observed in receiving X water Non-stormwater discharge observed X Exit interview conducted with: Johnnie Alexander, Adam Georgia, and Loren Wild Preliminary findings discussed during the exit interview included: 1. SWPPP appears to be updated to reflect current industrial activities and operations 2. Quarterly Good Housekeeping/BMP Inspections have been documented on a consistent and regular basis 3. Stormwater Analytical results were made available when a discharge occurred at the outfall a. Last monitoring results from 11/18/2024 indicate a pH of 7.7 and TSS of 9.7 mg/L 4. Training appears to be conducted on an annual basis for employees a. Ensure new employees receive training as well as employees on an annual basis Preliminary findings noted after the exit interview included: 1. Observed minor dust control concerns/issues at the site. 2. Observed minor sediment track out at entrance / exit Photo Log is attached. Page 5 of 5 Facility Name: EPA Division: EPA Branch: EPA Media: Photo ID: Date Stamp: Time Stamp: Description: PHOTO LOG Concrete Supply Company (CSC) - South Plant, Charlotte, NC ECAD Water Stormwater - Industrial aerial image - CSC South Plant.jpg 1/13/2025 05:30 PM Aerial image of industrial site. Note: Due to technical difficulties with the digital camera, no GPS coordinates were collected associated with the photos taken during the stormwater inspection. Page 1 of 21 Facility Name: EPA Division: EPA Branch: EPA Media: Photo ID: Date Stamp: Time Stamp: Description: PHOTO LOG Concrete Supply Company (CSC) - South Plant, Charlotte, NC ECAD Water Stormwater - Industrial DSCN 1557 1/13/2025 02:04 PM Storm Water Pollution Prevention Plan (SWPPP) - Site Map Page 2 of 21 Facility Name: EPA Division: EPA Branch: EPA Media: Photo ID: Date Stamp: Time Stamp: Description: PHOTO LOG Concrete Supply Company (CSC) - South Plant, Charlotte, NC ECAD Water Stormwater - Industrial DSCN 1558 1/13/2025 02:46 PM Designated area for Aug Mixture containers located within secondary concrete berm Page 3 of 21 Facility Name: EPA Division: EPA Branch: EPA Media: Photo ID: Date Stamp: Time Stamp: Description: PHOTO LOG Concrete Supply Company (CSC) - South Plant, Charlotte, NC ECAD Water Stormwater - Industrial DSCN 1559 1/13/2025 02:51 PM Designated area for collection pits for process wastewater, stormwater, and comingle Page 4 of 21 Facility Name: EPA Division: EPA Branch: EPA Media: Photo ID: Date Stamp: Time Stamp: Description: PHOTO LOG Concrete Supply Company (CSC) - South Plant, Charlotte, NC ECAD Water Stormwater - Industrial DSCN 1560 1/13/2025 02:51 PM Designated area for collection pits for process wastewater, stormwater, and comingle Page 5 of 21 Facility Name: EPA Division: EPA Branch: EPA Media: Photo ID: Date Stamp: Time Stamp: Description: PHOTO LOG Concrete Supply Company (CSC) - South Plant, Charlotte, NC ECAD Water Stormwater - Industrial DSCN 1561 1/13/2025 02:51 PM Designated area for collection pits for process wastewater, stormwater, and comingle Page 6 of 21 Facility Name: EPA Division: EPA Branch: EPA Media: Photo ID: Date Stamp: Time Stamp: Description: PHOTO LOG Concrete Supply Company (CSC) - South Plant, Charlotte, NC ECAD Water Stormwater - Industrial DSCN 1562 1/13/2025 02:53 PM pH Adjusting system with CO2 tank and sand filter Page 7 of 21 Facility Name: EPA Division: EPA Branch: EPA Media: Photo ID: Date Stamp: Time Stamp: Description: PHOTO LOG Concrete Supply Company (CSC) - South Plant, Charlotte, NC ECAD Water Stormwater - Industrial DSCN 1563 1/13/2025 02:55 PM Usage of filtration bag as a structural BMP Page 8 of 21 Facility Name: EPA Division: EPA Branch: EPA Media: Photo ID: Date Stamp: Time Stamp: Description: PHOTO LOG Concrete Supply Company (CSC) - South Plant, Charlotte, NC ECAD Water Stormwater - Industrial DSCN 1564 1/13/2025 02:55 PM Rain gauge located near collection pit Page 9 of 21 Facility Name: EPA Division: EPA Branch: EPA Media: Photo ID: Date Stamp: Time Stamp: Description: PHOTO LOG Concrete Supply Company (CSC) - South Plant, Charlotte, NC ECAD Water Stormwater - Industrial DSCN 1565 1/13/2025 02:56 PM Location of outfall - no discharge during the stormwater inspection Page 10 of 21 Facility Name: EPA Division: EPA Branch: EPA Media: Photo ID: Date Stamp: Time Stamp: Description: PHOTO LOG Concrete Supply Company (CSC) - South Plant, Charlotte, NC ECAD Water Stormwater - Industrial DSCN 1566 1/13/2025 02:59 PM Designated area for truck wash material containers Page 11 of 21 Facility Name: EPA Division: EPA Branch: EPA Media: Photo ID: Date Stamp: Time Stamp: Description: PHOTO LOG Concrete Supply Company (CSC) - South Plant, Charlotte, NC ECAD Water Stormwater - Industrial DSCN 1567 1/13/2025 02:59 PM Designated area for truck washout Page 12 of 21 Facility Name: EPA Division: EPA Branch: EPA Media: Photo ID: Date Stamp: Time Stamp: Description: PHOTO LOG Concrete Supply Company (CSC) - South Plant, Charlotte, NC ECAD Water Stormwater - Industrial DSCN 1568 1/13/2025 03:00 PM Designated area for truck wash out collection Page 13 of 21 Facility Name: EPA Division: EPA Branch: EPA Media: Photo ID: Date Stamp: Time Stamp: Description: PHOTO LOG Concrete Supply Company (CSC) - South Plant, Charlotte, NC ECAD Water Stormwater - Industrial DSCN 1569 1/13/2025 03:01 PM Designated area for used concrete placement/storage Page 14 of 21 Facility Name: EPA Division: EPA Branch: EPA Media: Photo ID: Date Stamp: Time Stamp: Description: PHOTO LOG Concrete Supply Company (CSC) - South Plant, Charlotte, NC ECAD Water Stormwater - Industrial DSCN 1570 1/13/2025 03:04 PM Material Storage area with cover Page 15 of 21 Facility Name: EPA Division: EPA Branch: EPA Media: Photo ID: Date Stamp: Time Stamp: Description: PHOTO LOG Concrete Supply Company (CSC) - South Plant, Charlotte, NC ECAD Water Stormwater - Industrial DSCN 1571 1/13/2025 03:04 PM 55-gallon drums located on spill pad within the material storage area with cover Page 16 of 21 Facility Name: EPA Division: EPA Branch: EPA Media: Photo ID: Date Stamp: Time Stamp: Description: PHOTO LOG Concrete Supply Company (CSC) - South Plant, Charlotte, NC ECAD Water Stormwater - Industrial DSCN 1572 1/13/2025 03:06 PM 6,000 gallon above ground storage tank (AST) with secondary and tertiary containment Page 17 of 21 Facility Name: EPA Division: EPA Branch: EPA Media: Photo ID: Date Stamp: Time Stamp: Description: PHOTO LOG Concrete Supply Company (CSC) - South Plant, Charlotte, NC ECAD Water Stormwater - Industrial DSCN 1573 1/13/2025 03:30 PM View of entrance / exit to the industrial facility - observations of some sediment/dirt track out Page 18 of 21 Facility Name: EPA Division: EPA Branch: EPA Media: Photo ID: Date Stamp: Time Stamp: Description: PHOTO LOG Concrete Supply Company (CSC) - South Plant, Charlotte, NC ECAD Water Stormwater - Industrial DSCN 1574 1/13/2025 03:30 PM View of entrance / exit to the industrial facility - observations of some sediment/dirt track out Page 19 of 21 Facility Name: EPA Division: EPA Branch: EPA Media: Photo ID: Date Stamp: Time Stamp: Description: PHOTO LOG Concrete Supply Company (CSC) - South Plant, Charlotte, NC ECAD Water Stormwater - Industrial DSCN 1575 1/13/2025 03:31 PM View of the industrial facility - observations of need for dust control Page 20 of 21 Facility Name: EPA Division: EPA Branch: EPA Media: Photo ID: Date Stamp: Time Stamp: Description: PHOTO LOG Concrete Supply Company (CSC) - South Plant, Charlotte, NC ECAD Water Stormwater - Industrial DSCN 1576 1/13/2025 03:32 PM View of entrance / exit to the industrial facility Page 21 of 21