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ENVIRORAENTAL Qi. <br /> ANALYTICAL CHEMISTS � <br /> R E CE I V Ivo <br /> JAN 2 3 1992 <br /> January 17, 19.92 ENV1.f��� `y `3TA.L t-iE L1 <br /> Rini l�f/ ERViCES <br /> Mr: Michael Infurna <br /> EHD/PHS . <br /> P.O.. Box 2009 I <br /> Stockton, CA `95201 <br /> �95201 <br /> RE: Devencenzi , 2.1167' 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 /> Il 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 /> -detectable amounts of oil and grease. <br /> We believe the results of 418. 1 are correct . and those of 503C are <br /> gravimetric method and the presence <br /> of <br /> misleading. �Methad SM503C is a p <br /> - l measured and the <br /> - .extractable non of y . rriatter will influence the materia <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 /> hn Quinn, Ph.D. <br /> Laboratory Director <br /> E J,FQ:Jgc <br /> cc: Margaret Lagorio <br /> William ,.Hunter <br /> Corporate Offices&Laboratory Office&'Liboratory Field Office <br /> P.O.Box 2721853 Corporation Street 2500 Stagecoach Road Visa}ia, California <br /> Santa Paula,CA 93061-0272 Stockton,CA 95215 TEL:(209)734-9473 <br /> E <br /> 6273 <br /> TEL(805)659-0910 TEL:(209)942-0161 Mobile:(209)738 <br />