Document NGkGwBkpNgajggz3Qp6Lqqm58

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 Plant Lead o: 704-527-1387 Loren Wild Area Manager o: 704-309-4418 Responsible Official: Johnie Alexander, Environmental Manager Email: Johnie.Alexander@concretesupplyco.com Office: 704-372-2930 Entry Date/Time: 01/13/2025 at 01:30 PM INSPECTION ENTRY DATES/TIMES 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 Records X Facility Site Review X Self-Compliance Program Compliance Schedule Laboratory Pretreatment X Pollution Prevention X Storm Water X Effluent/ Receiving Waters Flow Measurement X Operations & Maintenance Sludge Handling/ Disposal INSPECTION SUMMARY Combined Sewer Overflow Sanitary Sewer Overflow 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 JEREMY JUDD Date: 2025.04.09 08:17:49 -04'00' Digitally signed by JEREMY JUDD Jeremy Judd, Environmental Engineer LONNIE DORN Digitally signed by LONNIE DORN Date: 2025.04.10 10:29:28 -04'00' Lonnie Dorn, Life Scientist AHMAD Digitally signed by AHMAD DROMGOOLE DROMGOOLE 15:40:36 -04'00' Date: 2025.04.14 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 Secondary Containment Plan YES Part B.8 The facility does not include a secondary containment plan as part of the SWPPP. A SPCC plan, if applicable, was not provided or made available for review. 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 The facility does not include a solvent management plan as part of the SWPPP. Please note, that if solvents are not stored or used onsite, the owner must certify that in the SWPPP. No certification was made available for review. 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 NO N/E X X 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 X observed 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 a. Verify if SWPPP has secondary containment plan section or a SPCC for the facility. This section would be different from Section 12 Spill Response in the current SWPPP. b. Verify if SWPPP needs a Solvent Management Plan 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 3. Verify if the facility has a SPCC and/or Secondary Containment Plan within the SWPPP Photo Log is attached. Page 5 of 5