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Secondary Containment Assessment Page A: <br />Overhead view: <br />Cross sectional (lateral) view. Aveas ✓ el 5 <br />--- AY ec Q <br />C o US <br />Volume calculations: <br />Tank volume (largest tank): 10,300 gallons. <br />Containment volume (sum of areas 1, 2 & 4) = 20, 177 gallons (gross) <br />Less tank volume = 1504 gallons, containment volume = 18,673 gallons (net) <br />Volume/inch = 18673 gal/24 in = 778 gal/in <br />Excess volume = 18673 - 10300 gals. equivalent to 8373 gal / 778 gal/in = 10.7 in <br />24 hr., 25 yr. storm = 2.4 to 2.6" for most of San Joaquin Valley. <br />Therefore, secondary containment volume is adequate. <br />Design of containment area: Secondary containment is provided by a number of areas <br />enclosed by poured concrete, or concrete block, walls with re -bar. The containment area <br />does not have cracks or gaps to allow the escape of spilled material. Area 1 (East end) is <br />connected to area 2 by an open pipe, and area 2 is connected to area 4 (West end) by a <br />pipe, which passes through area 3 (caustic storage) and separates the two (caustic and <br />wastewater) containment areas. <br />Site Security: The entire site is fenced. The gate is locked when company personnel are <br />not present. <br />Secondary Containment findings: The secondary containment system is of sufficient <br />capacity and condition for the containment of releases from the 10,300 gallon wastewater <br />tank and ancillary equipment. Initials: O <br />California Tank Lines, Inc. Wastewater Storage Tanks (4) <br />