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Home My WebLink AboutTANK LINING 2024 1301 Academy Ct. Fort Collins, CO 80524 www.cgrs.com 800.288.2657 76 Wible Inc. 3301 Wible Rd. Bakersfield, CA 93309 CGRS Project # 28585 76 Wible Inc. – Bakersfield, CA UST LINING INSPECTION REPORT July 1, 2024 Prepared for: 76 Wible Inc. TABLE OF CONTENTS 1.0 INTRODUCTION .......................................................................................................................................................... 3 2.0 SCOPE ......................................................................................................................................................................... 3 3.0 TANK INSPECTION AND FINDINGS ........................................................................................................................ 3 3.1 Subject UST........................................................................................................................................................... 3 3.2 Inspection .............................................................................................................................................................. 4 3.3 Dry-Film thickness testing ..................................................................................................................................... 4 4.0 CONCLUSION ............................................................................................................................................................. 4 FIGURES Figure 1: Tank Layout APPENDICES Appendix A: Photo Log Appendix B: Dry Film Thickness Readings Appendix C: Certifications April 28, 2023 1.0 INTRODUCTION This report summarizes the internal inspection and determination of fitness for continued service of two (2) existing underground fuel storage tanks (USTs) located at 3301 Wible Rd. Bakersfield, CA 93309 (76 Wible Inc.), a 76 service station. Two USTs on site were inspected as part of the 10 and 5-year inspection program. The 12,000- gallon premium unleaded UST (T2- 91) is a single walled steel tank, and the 10,000-gallon unleaded UST (T3- 87) is a single walled steel tank. As a part of routine maintenance and EPA CFR 40 Part 280.21 and CCR Title 23-2663 (h), CGRS, Inc. of Fort Collins, CO performed 5-year internal lining inspections. This report presents UST shell and bulkhead coating thicknesses and visual inspection results. The report also provides CGRS’s opinion on the USTs fitness for continued use. 2.0 SCOPE CGRS was hired by 76 Wible Inc. to provide internal UST lining inspections. The scope of the work included making the USTs safe for confined space entry, clean the USTs for observations, visually evaluate the USTs to determine if the tanks have any major or minor coating damage. Perform dry-film (coating) thickness readings and visual inspections. The inspection shall follow a modified fit-for-service analysis as prescribed by American Petroleum Institute API 1631 “Interior Lining and Periodic Inspection of Underground Storage Tanks,” National Leak Prevention Association (NLPA) Standard 631, and industry-standard structural standards for UL-1316 tanks. To meet the Water Board requirements of CCR Title 23-2663, Interior Tank Lining Requirements, the special inspector (Niko Retes NACE Coatings Inspector Level 2) entered and inspected the entire interior surface of the tank and certified the tank based on the inspection criteria below. 3.0 TANK INSPECTION AND FINDINGS 3.1 Subject UST 76 Wible Inc. operates a service station and convenience store providing diesel, unleaded, and premium fuels at the site. The manufacturer and age of the UST was not identified. The dimensions of the tanks are as follows: a.) UST-1 not inspected b.) UST-2 8’ X 33’ c.) UST-3 8’ X 33’ The tanks are buried approximately 4-feet below a concrete surface deck. The tank was accessed through the fill sump with an integral tank manway lid. Photographs are provided in Appendix A. The Steel Tank was inspected based on the following criteria: a) CGRS cleaned the tank so that no residue remained on the tank walls. b) CGRS visually checking the tank interior and lining for discontinuity, compression, tension cracking, and corrosion. c) For steel tanks, testing the entire tank interior using a thickness gauge on a one-foot grid pattern with metal wall thickness recorded on a form that identifies the location of each reading in order to verify that average metal thickness is greater than 75 percent of the original wall thickness. d) Testing for liner thickness and hardness of the lining in accordance with nationally recognized industry codes to verify that the lining meets the standards under which the lining was applied. e) For steel tanks, testing the lining using an electrical resistance holiday detector in accordance with nationally-recognized industry codes. The owner or operator shall have all holidays repaired and checked in accordance with nationally recognized industry codes. f) Certification from the special inspector or coatings expert that the tank is: Suitable for continued use for a minimum of 60 months; 3.2 Inspection CGRS Inc. prepared the USTs for entry by opening the fill port sump, removed fill and vapor sump to access the UST’s manway lid. The team purged the USTs of vapors, and conducted confined space protocol air monitoring, prior to entering the tanks and inspecting the USTs. Sediment and remaining fuel were cleaned from the tank. The tanks met the visual criteria. The liner material was over 100 mils making steel thickness readings over the grid impossible. The liner thickness data is summarized below. No barcol testing was performed. No holidays were detected. 3.3 Dry-Film thickness testing Coating thickness measurements for shell and bulkheads were obtained using a Dry-Film Thickness Gauge; it has an LCD display with digital numeric readout. The shells and bulk heads are in good condition. The shells and bulkheads coatings showed little to no signs of deterioration. No signs of damage were noted on the tank. The current average coating thickness for the shell in tank two (2) is 117.6-mils. The current average coating thickness for the shell in tank three (3) is 133.2-mils. 4.0 CONCLUSION Limitations: This inspection was conducted in accordance with generally accepted industrial standards and represents site conditions during the time of the visit. The inspection did not include review of design drawings or weld inspection reports. If external UTs were performed, they are an average and may not find all flaws. As such the limits of this report are as an overall survey of the tank this report does not serve as a guaranty of future system performance. Due care has been taken to verify and confirm the accuracy of this report. The inspection focuses on a failure mode which can be determined by visual and may not identify modes of failure such as stress corrosion cracking, hydrogen embrittlement, and micro effects of metal flaws in steel manufacturing which would require a more extensive non-destructive and destructive testing. A safety factor is used to accommodate these unknowns and is typical in engineering analysis. BATC found the remaining coating thickness to be within the required limits. No visual defects were found during the inspection. As such, CGRS finds the USTs ARE SUITABLE for continued use. If you have any questions please contact the undersigned inspector, Niko Retes at (360) 823-6265. Sincerely, CGRS, Inc. Niko Retes., Project Manager. APPENDIX A Photo Log Site setup Site Setup Tank 2 (Premium) Dry Film Thickness Readings Tank 2 (Premium) Internal Lining APPENDIX A Photo Log Tank 2 (Premium) Turbine Bulk Head Tank 3 (Unleaded) Dry Film Thickness Readings Tank 3 (Unleaded) Internal Lining Tank 3 (Unleaded) Internal Lining Bulk Head APPENDIX B Dry Film Thickness Measurements Dry Film Thickness Readings Mean Min Max Pass Tank #2 - Premium 117.6 mils 62.32 mls 192.1 mils Yes Tank #3 - Unleaded 133.2 mils 81.73 mils 172.1 mils Yes APPENDIX C CERTIFICATIONS APPENDIX C CERTIFICATIONS APPENDIX C CERTIFICATIONS APPENDIX C CERTIFICATIONS