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SEQUOIA ANALYTICAL <br /> 1900 Bates Avenue • Suite LM • Concord, California 94520 <br /> (510) 686-9600 FAX (510) 686-9689 <br /> prealiail nginee�ing, lric SS V h -Tient!�r'o- f Il0`Ui;ocai #5098,5608 Pacific Ave, Stockton <br /> {P O Box 996 <br /> Benicia, CA 94510 <br /> Attention Mardo Kaprealian, P E QC Sample Group 2051170-1180 Reported Jun 9, 1992 <br /> QUALITY CONTROL DATA REPORT <br /> SURROGATE <br /> EPA EPA EPA EPA EPA <br /> Method 8015/8020 8015/8020 8015/8020 8015/8020 8015/8020 <br /> Analyst J Dinsay J Dinsay J Dinsay J Dinsay J Dinsay <br /> Reporting Units mg/Kg mg/Kg mg/Kg mg/Kg mg/Kg <br /> Date Analyzed 5/29-x/1/92 5/29-6/1/92 5/29-6/1/92 5/29-x/1/92 Jun 2, 1992 <br /> Sample# 205-1177 205-1178 205-1179 205-1180 Blank <br /> lb <br /> Surrogate <br /> %Recovery 93 88 88 86 100 <br /> IDEQkAA LYTICAL %Recovery Conc of M S -Conc of Sample x 100 <br /> Spike Conc Added <br /> Relative%Difference Conc of M S -Conc of M S D x 100 <br /> S o (Cone ofMS + Conc of MSD)/2 <br /> Projger <br />