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bond • Tank supports • Tank foundation and external supports • Tank gauges and alarms • Tank appurtenances • Emergency vents • Release prevention barriers • Spill Control systems The inspection of the Poly Tank was performed based on procedure and scope outlined in the New York State Department of Environmental Conservation document DER-16: Five-Year Inspection of Plastic Tanks. There is no widely accepted industry standard for polyethylene tank inspections, and this standard was used because it presents detailed procedures for performance of a thorough external inspection for plastic tanks. 4. Certification of the Poly Tank System Upon inspection, Ms. Karen Petryna (ID#AST-2072), a certified STI SP001 tank inspector, has found the Poly Tank System to be in good condition with no significant corrosion, cracks, or leaks and that ancillary equipment is supported and protected against physical damage and excessive stress due to settlement, vibration, expansion, or contraction. Based on this and the information provided in this Engineering Assessment Report, as required by 22 CCR 66265.192, the Poly Tank System has been found to have sufficient structural integrity and is acceptable for the transferring of hazardous waste. As described herein, the Poly Tank System complies with all applicable elements of 22 CCR 66265.190 through 200. The Inspector's STI Certification is presented in Appendix A. 5. Poly Tank System Description The Poly Tank System is located at the approximate center of the Site and Plant, approximately 75 feet north of the Main Gate. It sits on a concrete mat foundation on the ground surface in an open area adjacent to the machine parts cleaning room. Four-inch diameter chlorinated polyvinyl chloride (CPVC) pipe connects the drain from the hot vat and steam cleaning room on the second story of the adjacent building to the inlet on the top of the Poly Tank such that the oily water and sodium hydroxide cleaning solution wastewater flows by gravity into the Poly Tank. CPVC is significantly more flexible and can withstand higher temperatures than standard PVC. The CPVC conveyance piping is secured to the building with metal clamps. The outlet from the Poly Tank, where the wastewater is drained out for offsite disposal, is located near the tank base. The liquid level in the Poly Tank can be monitored through a digital display of the liquid level sensor located on the wall of the adjacent building. GHD I Engineering Assessment and Certification of Integrity of the 1,550-Gallon Polyethylene Waste Tank System 111189093(2)1 Page 2