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Mr.Kyung Park October 11,2009 - Page 3 of 4 Description of any structural damage or inadequate installation or construction No grounding wire and associated grounding rod were observed;however,the tank is not a fuel-storage tank. Results of leak test internal inspection or other integrity testing: The inspection was limited to visual observation. Leak testing was not performed. A written assessment and certification prior to the tank being placed in service were not available for review. An internal inspection of the interstitial space was conducted via the labeled secondary emergency vent port. No signs of leakage were observed at the time of the inspection. Estimate of tank's service life: The tank manufacturer provides a I-year warranty but no prediction of the tank's useful life. From a regulatory perspective, the tank is considered a new tank(installed after July 1, 1991). Properly manufactured, installed and maintained oil tanks can have a life expectancy of 20-30 years. Conclusions and Additional Considerations The tank installation is acceptable for waste oil storage. This assessment is valid for five(5)years (effective term); however, an assessment renewal is not required if the tank/system has secondary containment that meets standards. HDR I e2M recommends the following: • Installation of a 2-inch polypropylene tank vent(Banjo VC200 or similar)into the secondary containment space. With the absence of electronic interstitial monitoring,the secondary emergency vent plug should be removed monthly and the space checked for potential leaks. • Modification of the inspection log sheet to include leak check information(i.e.,free and clear of liquid). • Monitoring and maintenance continue in accordance with applicable regulations and manufacturer's.requirements. This report is based on available information and was prepared in accordance with currently accepted engineering practices. No other warranty is implied or intended. This report has been prepared for the sole use of Tracy Express Carwash and Lube and applies only to the subject site and tank. Use of this report by third parties shall be at their sole risk. This report was prepared under the direct supervision of the California Professional Engineer(P.E.)whose signature appears below. We appreciate the opportunity to be of service to you. If you have any questions, please do not hesitate to contact us at 916-817-4700. HDR I e'M oncam,,..I,Ha„�.