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MEMORANDUM <br /> TO: Stacy Anastasia 1f;,�;%..,�N M• P(CfA <br /> CP <br /> Henderson Construction <br /> FROM: I.M. Plecnilc `, �' No. 026354 <br /> Consultant �\;� �x /2, <br /> 1880 San Anseline <br /> Long Beach, CA 90815 <br /> (562) 985-4406 '.x. '}_ i;i�1,`�, <br /> DATE: October 15, 1998 <br /> SUBJECT: Structural Evaluation of an Owens Corning !Fiberglass Tank at a Gas Station in <br /> Stockton, Califomia <br /> Based on my discussions with Owens Corning, this tank has experienced fracture of the <br /> inner shell. The outer shell of the double wall tank has not been damaged, and liquid has been <br /> lost. Therefore, my evaluation of the tank will be performed in the following manner. <br /> I. Visual inspection of the entire inner surface of the tank wall and especially the damaged <br /> area. Since I have designed such gasoline storage tanks for many years and have been <br /> involved in experimental testing, I should be able to detemine, based on visual inspection, <br /> the extent of damage and probable cause. <br /> 2. Barcol hardness values wltl be obtained in several regions surrounding the damaged area <br /> to assess the degradation of'the resin ifany. <br /> 3. At the time of the inspection, it will be determined as to whether or not a sample will be <br /> removed from the inner tank wall and experimentally evaluated for material properties. At <br /> this time, without having visually inspected the tank, it is difficult for me to state whether <br /> or not such a sample must be taken. <br /> In the past, I have entered many underground gasoline storage tanks throughout the USA <br /> for evaluation and certification purposes. I have been involved with both Owens Corning, and to <br /> a mush greater extent, with Xerxes Corporation, in the design and experimental evaluation of <br /> underground gasoline storage tanks since 1973. <br /> Regarding entry ofconlined Spaces, 1 renewed my confined space entry certification on <br /> October 5, 1998 through LifeCom of l-luntington Beach, CA (800/824-5178). Regarding the <br /> entry of this particular tank, please inform me if a self contained breathing apparatus, SOBA, is <br /> necessary. if it is necessary, please indicate whether 1 should bring my own or will one be <br /> provided at the job site. <br />