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Hazardous Waste Tank Assessment—Used Coolant Tank September-17,2021 American Tire&Truck Repair Project No.1241 French Camp,CA Page 3 compatible with the steel construction of the AST. • Prior to placing the new tank system or component in use, inspect the system for(a)weld cracks or breaks, (b) scrapes of protective coating, (c) corrosion, any structural damage or inadequate construction or installation 122 CCR §66265.192(k)(9)1: The tank is approximately 20 years old. Present condition is clean, level, and dry. There is no evidence of weld cracks or breaks, scrapes of protective coatings, corrosion, or any structural damage or inadequate construction or installation. • The results of tank tightness test prior to prior to being placed into use 122 CCR §66265.192(k)(10)1 The AST was pressure tested at the factory to UL 142 specifications (3 psi) at the time of manufacture. The AST has been in used for approximately 20 years. Tightness testing at this time is not warranted. • The estimated remaining service life of the tank system 122 CCR §66265.192(k)(11)1 According to the literature on steel tanks, if there is adequate design, competent construction, along with regular maintenance and qualified inspection, a steel tank can last for more than 100 years. One of the key variables for corrosion in a steel tank is the presence of corrosives (e.g., acid) and the presence of water (e.g., condensate) in direct contact with the inside of the tank for long periods of time. Since this tank contains used coolant,which typically contains rust inhibitor additives,it is highly unlikely that corrosion will affect the inside of the primary tank. Corrosion consultants typically assign the useful life of a steel tank to be upwards of 30 years. The tank should be replaced when the steel substrate is compromised due to corrosion. Typically, the condition of the inside of the primary tank is determined by visual inspection in combination with the use of ultrasonic testing (UT),which measures tank thickness. Due to the lack of access, the measurement of the primary tank thickness on a double-wall tank is not possible using UT. We estimate that the remaining service life of this tank is at least 20 years. However, the service life may be extended if a certified professional determines there is minimal risk from corrosion. Per 22CCR §66265.192(h)(1), this tank will be re-assessed by an engineer within 5 years of the date of this report. • Tank foundation will maintain the load of a full tank 122 CCR §66265.192(a)(5)(A)1: The dead load weight of the full tank is estimated to be 1,106 pounds. The tank is set on a reinforced concrete pad that is at least 6-inches thick. The foundation will maintain the load of this tank. • Tank system is anchored to prevent dislodgement when located within a seismic fault zone 122 CCR §66265.192(a)(5)(B)1: Geographically,the tank is in Seismic Risk Category III. The tank is anchored on all four corners with 4"x4"x'/4" angle iron set with %z" diameter Simpson Strongbolt"-2SS expansion anchors with 3" embedment. The system is anchored to prevent dislodgement in a seismic event. The anchor clips conform with the seismic code and were designed by R.P. Associates, Inc. (see Attachment Q. The anchor clips were installed on September 10, 2021. Raman Patel,P.E. of R.P. Associates inspected the anchors and determined the installation meets requirements in the seismic code. The inspection letter is provided in Attachment