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27 August 2012 <br /> AGE-NC Project No. 12-2181 <br /> Page 4 of 6 <br /> 3.1. WASTE OIL TANK (AST) DESIGN <br /> The manufacturer, Mosier Bros. of Woodlake, Ca., identifies the facility AST as a 550 - <br /> gallon Double Wall Cylindrical Tank. The primary and secondary compartments are <br /> manufactured [22CCR§66264.193(e)(3)]from 12 gauge steel, discussed in Section 2.1.3. <br /> The AST ancillary equipment, if present, is discussed in Section 2.1.4. <br /> 3.2. VISUAL INSPECTION <br /> The AST visual inspection [22CCR§66264.193(e)(2)] was conducted by AGE on 17 July <br /> 2012. The AST exterior surface did not reveal signs of leaks, corrosion, weld cracks, weld <br /> breaks or scrapes in coating which may cause a release from the AST system. A visual <br /> assessment summary is included as Table 3 <br /> 4.0. HYDROSTATIC EVALUATION <br /> The hydrostatic evaluation [22CCR§66265.192(k)(10)] was conducted to verify the AST <br /> primary and secondary annular space integrity on 17 July 2012. Hydrostatic evaluation <br /> measurements are provided on Table 4. <br /> 4.1. HYDROSTATIC EVALUATION PROCEDURE <br /> The AST primary and secondary compartment ports were temporarily sealed to maintain <br /> an inner constant hydrostatic pressure, except for ports where pressure regulators were <br /> installed for monitoring and measurement collection purposes. Primate AST ports and <br /> respective locations are shown on Figure 3. <br /> An approximate 4 pounds per square inch (psi) of air pressure was applied to the primary <br /> annular space. Data was collected for half an hour, in ten minute increments. Pressure was <br /> released from the primary annular space into the secondary annular space immediately <br /> after the final primary space data was collected. The resulting hydrostatic pressure was <br /> utilized for secondary annular space evaluation; an approximate 3.5 psi was placed within <br /> the secondary annular space. Following hydrostatic pressure equalization, pressure <br /> measurements were collected from the secondary annular space everyten minutes forone <br /> half hour. Hydrostatic pressure was released after the final measurement was collected. <br /> The AST was returned to its original operating condition immediately after the hydrostatic <br /> evaluation was completed. <br /> Advanced GeoEnvironmental,Inc. <br />