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• Sequoia 680 Chesapeake Drive Redwood City,CA 94063 (415) 364 9600 FAX(415) 364 9233 <br /> 1900 Bates Avenue Swt,L Concord,CA 94520 (510) 686 9600 FAX (510) 686 9689 <br /> ,-!D— <br /> Analytical 819 Striker Avenue Suite 8 Sacramento CA 95834 (916) 921 9600 FAX(916)921 0100 <br /> WP08 Services Client Project lb Unocal #6015, 601 E Kettleman, Lodi <br /> 2401 Stanwell Dr, Ste 400 Matrix Liquid <br /> Concord, CA 94520 <br /> Attention Avo Avedessian QC Sample Group 4091957-967 Reported Oct 19, 1994 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Benzene Toluene Ethyl Xylenes <br /> Benzene <br /> Method EPA 6020 EPA 8020 EPA 8020 EPA 8020 <br /> Analyst A Tuzon A Tuzon A Tuzon A Tuzon <br /> MS/MSD <br /> Batch# 4091965 4091965 4091965 4091965 <br /> Date Prepared 10/11/94 10/11/94 10/11/94 10/11/94 <br /> Date Analyzed 10/11/94 10/11/94 10/11/94 10/11/94 <br /> Instrument I D # HP-4 HP-4 HP-4 HP-4 <br /> Conc Spiked 20 Mg/L 20 ug/L 20 erg/L 60 Ng/L <br /> Matrix Spike <br /> % Recovery 80 90 95 97 <br />. Matrix Spike <br /> Duplicate% <br /> Recovery 80 90 95 95 <br /> Relative % <br /> Difference 0 0 0 0 0 0 2 1 <br /> LCS Batch# 21-CS101194 2LCS101194 2LC8101194 2LCS101194 <br /> Date Prepared 10/4/94 10/4/94 10/4/94 10/4/94 <br /> Date Analyzed 10/4/94 10/4/94 10/4/94 10/4/94 <br /> Instrument I D # HP-4 HP-4 HP-4 HP-4 <br /> LCS % <br /> Recovery 88 96 96 97 <br /> Recovery <br /> Control Limits 71-153 72-128 72-130 71-120 <br /> Please Note <br /> The LCS is a control sample of known, interferent free matrix that is analyzed using the same reagents, <br /> SEQUOIA ANALYTICAL, #1271 preparation,and analytical methods employed for the samples The matrix spike 1s an aliquot of sample <br /> fortified with known quantities of specific compounds and subjected to the entire analytical procedure If <br /> 4bignature on File the recovery of analytes from the matrix spike does not fall within specified control limits due to matrix <br /> Alan B Kemp interference,the LCS recovery is to be used to validate the batch <br /> Project Manager <br /> 4091957 MPD <4> <br />