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Project No. 10-1768 AdvancedGeo An Employee-Owned Company Page 12 of 19 5.2. BULK STORAGE CONTAINERS - 40 CFR 112.8 (c) Table 8 summarizes the construction, volume, and content of bulk storage containers at the Facility. 5.2.1. Construction - 40 CFR 112.8 (c)(1) All ASTs used at this Facility are constructed of steel, in accordance with industry specifications as described above. The design and construction of all bulk storage containers are compatible with the characteristics of the oil product they contain, and with temperature and pressure conditions. There is piping between fixed ASTs. The piping of each product does have dedicated piping and pumps for dispensing. 5.2.2. Secondary Containment - 40 CFR 112.8 (c)(2) A concrete cinder-block berm with a retention capacity of approximately 29,486 gallons, is provided around ASTs 1 through 5. The area of the tanks located within the berm occupy a volume of 10,476 gallons. The 25-year/24-hour precipitation rate for Lodi is 3.1 inches, occupying a total of 1,344 gallons within the secondary containment berm. Given these parameters, the total capacity of the secondary containment berm is 17,396 gallons. Although, 3,330-gallons of fuel would remain in the 20,000-gallon tank due to it reaching equilibrium with the height of the concrete berm, allowing an additional 3,330 gallons to be added to the total containment volume. Total containment equals 20,096 gallons which is greater than the largest tank volume of 20,000 gallons. The concrete secondary containment berm is sufficient to contain a spill of 100% of the largest aboveground storage tank plus the 25-year/24-hour precipitation rate for Lodi, California. An asphalt containment berm with a retention capacity of approximately 708 gallons, is provided around the AST enclosure located on the east side of the Tire Shop. The enclosure includes ASTs 7 through 10 as well as various 55-gallon drums. AST 13, located under a covered structure, is provided with a metal secondary containment with a retention capacity of approximately 311 gallons. A concrete berm surrounds AST 13, providing a tertiary containment with retention capacity of approximately 87 gallons, for a total retention capacity of 399 gallons. Secondary containment calculations are included in Appendix H. 5.2.3. Drainage of Berm Areas - 40 CFR 112.8(c)(3) The concrete berms are drained under direct supervision of Facility personnel. The accumulated water is observed for signs of oil prior to draining. The gate valves are normally kept in a closed position and locked except when draining the berm. Berm drainage events are recorded on the form included in Appendix G of this Plan. Records are maintained at the Facility for at least three years.