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N29574 11 Data and Correspondence Sludge, Scale and f'ater Bottoms -s from Gasoline Storage Tanks oo CO 02 o Ur Required: March 4 I9I4B Determination of lead compounds present Results Per Cent Per Cent Lead as Lead as Lead Tetraethyl Triethyl Lead <0.00001 O.OOO3 Per Cent Lead as Diethyl Lead Halides Q.OOI7 Per Cent Lead as Di- and TriethylLead Halides and Carbonates 0*00045 Per Cent Lead as Inorganic Lead 0.225 Reported: 3-24-48 0009888 SUBJECT Standard Oil Company - Steel EL Segundo, California DATE April 23, 1948 I regret very much not having answered your letter of March 31st sooner, regarding scale from side plates of a gasoline tank which you analyzed. You asked for the length of time that had elapsed since the plates (and scale) was in contact with gasoline. The tank was cleaned October 27, 194-7, and gasoline was in the tank up to within a few days of the time the tank cleaning started. The samples were taken about February 23, 1943. This would give an elapsed time of about four months between the time the samples were taken, and the time it was in contact with the gasoline. Yours very truly, AHC:dc A. H. Chenault KE 0009689