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s " � <br /> I <br /> proper cure and/or degradation of the surface resin. First,the acetone test was performed in <br /> which a cloth wetted with acetone was rubbed on the inner surface of the tank at 3 or 4 locations <br /> as prescribed by ASTM. No tackiness was evident in any of these locations. In addition to <br /> acetone, a more severe chemical was applied to the inner surface consist' g of 1/3 iso-octane, 1/3 <br /> toluene, and 1/3 ethyl alcohol by volume. This chemical is one of the standard mixtures <br /> prescribed by Underwriters Laboratories in the evaluation of fiberglass laminates for <br /> underground tanks. As with acetone,no sensitivity of the inner surface to this chemical was <br /> observed. Therefore, it can be concluded that the inner surface of the tank has not been <br /> chemically degraded by the storage of gasoline. Further evidence of this fact is the shiny <br /> appearance of the inner surface of the tank shell and the end domes. Therefore,the West tank is <br /> structurally sound and has experienced virtually no chemical degradation due to the storage of <br /> the gasoline. <br /> For the East tank, my measurements of the diameter were very similar to those of Fluid <br /> Containment(this data has also been given to Mr. Wilson for his analysis). The measured <br /> diameters are all within 1/2 in. of the original manufacturing diameter, thus well within the <br /> 1%requirement. Regarding visual inspection for the East tank, the same observations were <br /> made as for the West tank. Under chemical exposure of acetone, and the more severe mixture of <br /> toluene, iso-octane, and ethyl alcohol, there was no tackiness or sensitivity of the inner surface of <br /> the tank from both of these chemicals. The inner surface still has a shiny appearance which is a <br /> clear indication of little or no chemical degradation. Therefore,the East tank is structurally <br /> sound and has experienced little or no chemical degradation from the stored gasoline. <br /> In addition to the above conclusions,minor alterations recommended below are designed <br /> to enhance the performance of the tank over an extended period of time. <br /> 1. The interior center seam for both tanks should be provided with a bond which is currently <br /> lacking. <br /> 2. The bonds over plates at the bottom of both tanks should be enhanced with additional <br /> layers of mat. However, close inspection of these areas indicated that no degradation or <br /> cracking has been caused by past usage of dipsticks. <br /> 3. At the interface between the dome and the shell, a relatively rough transition surface is <br /> evident for both tanks and at both domes of each tank. Close visual inspection of this <br /> region indicated no chemical or physical degradation. However, it is my opinion that it <br /> would be prudent to apply one or two layers of mat approximately 6 in. wide followed by <br /> one layer of C-veil. <br /> Recently, it has been customary for Fluid Containment to perform Items 1 and 2 above <br /> when entering any single wall tanks. Item No. 3 is a suggestion which your company m -=—_, <br /> may not choose to adopt. If you have any questions, please call me at(562) 985-44 �'`��`{�l §'S;O�,fl <br /> Q M. <br /> C G; <br /> t No. 026354 <br /> lqT£ OF CAS-\F�� <br />