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1 Executive Summary 1.1 Objective of Tank Inspection The objective of this purchase order (PO) was to conduct a formal tank inspection of one 12,000 - gallon double -walled (DW) aboveground storage tank (AST) located at the Army and Air Force Exchange Service (AAFES) West Coast Distribution Center, 700 E. Roth Road, Lathrop, California (CA). The inspection was conducted in accordance with industry standard Steel Tank Institute (STI) SP001, 6th Edition. The purpose of the inspection was to collect the necessary data on the AST, identify deficiencies associated with the AST, obtain a picture of each deficiency if possible, and compile the data into a formal inspection report. Work accomplished consisted of site investigations, an interview with the tank manager, site photos, and measurements/location of the tank in relation to surrounding buildings. This Final Report provides sufficient detail for the AST to be incorporated into a future repair project. 1.2 Inspection Summary On 4 November 2021, Tim Baba, from HDR Environmental, Operations, and Construction, Inc. (HDR) visited the AAFES West Coast Distribution Center and met with Mr. William "Eddie" Young, Facility Manager to conduct the AST inspection. Before conducting the inspection, Mr. Baba discussed the inspection process, the data and pictures that would be gathered during the inspection, and if there were any environmental issues currently being addressed that involved the AST being inspected. The Facility Manager had no issues that needed to be addressed and understood how the inspection process would be conducted. There was one AST formally inspected and two others that were inspected for overall condition and operation. General tank information, to include a site drawing, can be found under Attachment A. A copy of the tank inspection checklist can be found under Attachment B. 2 Inspection Findings 2.1 Tank Repair Recommendations The 12,000 -gallon AST is used to support vehicles associated with facility operations. The following findings were identified during the inspection: Table 1. AST Findings Item Code Reference Finding Recommendation Unit Qty 1. STI SP001 Section Primary 2" tank vent has a Replace the defective primary vent with EA 1 7.1.9.2 defective protective screen. The OPW 23 Series, or equivalent, vent. screen is ripped and allows insects to enter the tank. 2. NFPA 30 Section The 8" emergency vent does not Install a new 8" emergency vent that flows EA 1 21.8.6 function as designed. The no less than 460,600 standard cubic feet emergency vent is rusted in the per hour. closed position. 31 Page