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5 . 0 ASSESSMENT OF ABOVEGROUND STORAGE TANK SYSTEM INTEGRITY CCR , Title 22 , Division 4 . 5 , Chapter 15 , Article 10 , Section 66265 , 191 requires that specific criteria be documented to establish the integrity of the existing AST system being inspected . ATTACHMENT H , ASSESSMENT OF ABOVEGROUND STORAGE TANK SYSTEM INTEGRITY, contains TABLE 1 , EXISTING ABOVEGROUND STORAGE TANK SYSTEM INTEGRITY EVALUATION . This table lists the regulatory requirements of the identified CCR section applicable to the Facility AST and ancillary components . 6 . 0 ABOVEGROUND STORAGE TANKS SEISMIC RISK ASSESSMENT Seismic events that cause accelerated ground motion can destabilize AST foundations and cause ASTs to overturn or collapse . The potential probability that a seismic event could occur in a specified time is termed seismic risk. The seismic risk for the Facility was calculated using the United States Geologic Survey ( USGS) Earthquake Probability Mapping Program . The Facility AST is located in a seismic risk area that has a 30% to 40 % probability of experiencing a Magnitude 5 . 0 or greater earthquake in the next 50 years . ATTACHMENT I , EARTHQUAKE PROBABILITY MAP contains DIAGRAM 2 , EATHQUAKE PROBABILIOTY MAP obtained from the USGS showing the earthquake probability for California and the Facility . 7 . 0 ABOVEGROUND STORAGE TANK INSPECTION HISTORY Ownership and management of the Facility has changed since the AST and ancillary equipment were installed . The current Facility jwner and manager have been unable to produce any previous inspection evidence to document that the AST and ancillary equipment have been inspected in compliance with the CCR , Title 22 , Division 4 . 5 , Chapter 15 , Article 10 , Sections 66265 . 191 to 66265 . 202 . 8 . 0 SUMMARY OF ABOVEGROUND STORAGE TANK SYSTEM INTEGRITY The AST and the secondary containment structure are supported by a PCC slab . Adequate secondary containment of the AST is provided by a secondary containment structure . The secondary containment structure has adequate capacity to contain a spill generated by the AST . Additionally , the AST is equipped with an air operated high liquid shut-off valve and audible whistle . The high liquid shut-off valve is equipped with a flexible poly pipe that returns overflows of used oil to the roil used oil pan . The rolling used oil pan is located over a mechanic pit that has sufficient capacity to contain spills generated by the oil pan either from commercial engine oil draining or a return of used oil from the AST . Piping used in the system is constructed with single-wall , flexible poly pipes with diameters ranging from 0 . 50- inches to 0 . 75- inches . The flexible poly piping is compatible with the used oil present in system . The flexible poly pipes are exposed and are able to be visually inspected by Facility personnel for deterioration and leaks . The AST , pneumatic pump , compressor, and flexible poly piping are serviceable and in good condition . Other AST shell integrity and piping issues were not apparent. ATTACHMENT J , SUITABILITY FOR SERVICE STATEMENT contains a certification statement regarding the suitability of the visually inspected ASTs , pumps , and pipes to continue in service at the Facility . ATTACHEMENT K, PHOTOS , contains photos of the AST and ancillary components . Gill Express Page 4 December 2018