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SEQUOIA ANALYTICAL <br /> 680 Chesapeake Drrve • Redwood Crty.CA 940653 <br /> NO (415) 364-9600 FAX(415)364-9233 <br /> i_ fy <br /> �Waterwork gient Project ID. 3765,Chevron,Stockton <br /> 171 Q Maln Street <br /> 'Escalon, CA 95320 <br /> Attention Tina LePage QC Sample Group• 1051338-134Q Reported: May 2Q, 1991 <br /> QUALiITY CONTROL DATA REPORT <br /> ANALYTE Eth* <br /> Benzene toluene benzene Xylenes <br /> EPA EPA EPA EPA <br /> Method 8015/8= 8015/WM 8015/8W0 8015/8= <br /> Analyst: FL Eastman R.Eastman R.Eastman R.Eastman <br /> Reporting Units ng ng ng ng <br /> Date Analyzed. May 10, 1991 May 10, 1991 May 1o, 1991 May 10, 1991 <br /> OC Sample#. GBLK 051091 GBLK 051091 GSLI(051091 GBLK 051091 <br /> Sample Conc: N D. N D N D. N D <br /> Spike Conc. <br /> Added: 100 100 100 300 <br /> Conc. Matrix <br /> Spike: 110 110 110 320 <br /> Matrix Spike <br /> %Recovery: 110 110 110 110 <br /> Conc. Matrix <br /> Spike Dup.: 110 110 110 330 <br /> Matrix Spike <br /> Duplicate <br /> • Recovery: 110 110 110 110 <br /> Relative <br /> •Difference: 00 0.0 00 31 <br /> EQ OIA ANALYTICAL %Recovery Conc at S -Co c t pie x 100 <br /> one. <br /> Relstive%Difference Conc of M 5 -Cone of M S D x 100 <br /> I2at]eth ac (Conc of M S. + Conc of M D) 2 <br /> Lroject Manager 1051338.WAT �2� <br />