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ENVIRONMENTAL <br /> ANALYTICAL CHEMISTS <br /> January 17, 1992 <br /> Mr. Michael Infurna F <br /> EHD/PHS JAS! 2 4 1992 <br /> P.O. Box 2009 ENVIROWALNTAf <br /> Stockton, CA 95201Rililii� VECt~ <br /> RE, Devencenzi , 21161 N Tretheway Road, Acampo, CA Soil Samples, #4359 <br /> Dear Mr. Infurna: <br /> It has come to my attention that two different analyses for oil and grease <br /> were run on the soil samples pulled on October 20, 1991 by William Hunter. <br /> Both EPA 418.1 and SM 503C were requested and run by our laboratory. The <br /> 418 1 method showed no detectable oil and grease. The 503C method showed <br /> r <br /> detectable amounts of oil and grease. <br /> We believe the results of 418 1 are correct and those of 503C are <br /> misleading. Method SM503C is a gravimetric method and the presence of <br /> extractable non-oily matter will influence the material measured and the <br /> interpretation of results No provision is made in 503C to differentiate <br /> between oily and non-oily material Method 418 1 makes this <br /> differentiation. In our opinion it is a superior method. <br /> If you have questions please call or write <br /> Very truly yours, <br /> hnQuinn, Ph D <br /> Laboratory Director <br /> JFQ jgc <br /> cc: Margaret Lagorio <br /> William Hunter <br /> c(OpIr <br /> Corporate Offices&La¢Q_rsjtg_ry Office&Laboratory El—eld Offi e <br /> P O Box 2721853 Corporation Street 2500 Stagecoach Road Visalia Caldomia <br /> Santa Paula CA 93061 0272 Stockton CA 95215 TEL (209)734 9473 <br /> TEL (805)659 0910 TEL (209)942 0181 Mobile (209)738 6273 <br />