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Vulcan Materials <br /> Western Division <br /> Memo <br /> From: Cesar Aranda, P.E., Emironm ental Manager <br /> To: Operations; SPCC Plan file <br /> Data April 24, 2019 <br /> Ra Valley Rock Quarry SPCC—AST integritytest <br /> In accordance with industry standard STI SP001, the facility's 10,000 gallon AST (AST 1) requires a <br /> Formal External Inspection (FEI),including tank thickness testing, every 20 years. <br /> As of the recent monthly inspection on April 23, 2019, records or information on the in-service date of <br /> AST 1 have not been located. <br /> Given that the Valley Rock Quarry facility is currently inactive and all ASTs are empty,a Formal External <br /> Inspection in accordance with STI SP001 shall be scheduled prior to re-use of AST 1. <br /> 0 Page 1 <br />