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I <br /> Sequoia 680 Chesapeake Drive Redwood Gty CA 94063 (415) 364 9600 FAX(415) 364 9333 <br /> /� <br /> `� 1900 Bates Avenue Suite L Concord,CA 94520 (510) 686 9600 FAX(5 10)686 9689 <br /> Analytical 819 Striker Avenue,Suite 8 Sacramento CA 95834 (916) 921 9600 FAX(916)921 0100 <br /> MPDS Services Client Project ID Unocal #2859, 1665 Pacific Ave, Stockton <br /> 2401 Stanwell Dr , Ste 400 Matrix Liquid <br /> Concord, CA 94520 <br /> Attention Avo Avedissian OC Sample Group 4110522-30 Reported Nov 23, 1994 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Benzene Toluene Ethyl Xylenes <br /> Benzene <br /> Method EPA 8020 EPA 8020 EPA 8020 EPA 8020 <br /> Analyst A Tuzon A Tuzon A Tuzon A Tuzon <br /> MS/MSD <br /> Batch# 4110530 4110530 4110530 4110530 <br /> Date Prepared 11/14/94 11/14/94 11/14/94 11/14/94 <br /> Date Analyzed 11/14/94 11/14/94 11/14/94 11/14/94 <br /> Instrument I D # HP-5 HP-5 HP-5 HP-5 <br /> Conc Spiked 20yg/L 20ug/L 20lig/L 60pg/L <br /> Matrix Spike <br /> % Recovery 100 105 105 105 <br /> • Matrix Spike <br /> Duplicate% <br /> Recovery 100 105 105 102 <br /> Relative% <br /> Difference 00 00 00 29 <br /> LCS Batch# 3LCS111494 3LCS111494 3LCS111494 SLCS111494 <br /> Date Prepared 11/14/94 11/14/94 11/14/94 11/14/94 <br /> Date Analyzed 11/14/94 11/14/94 11/14/94 11/14/94 <br /> Instrument I D # HP-5 HP-5 HP-5 HP-5 <br /> LCS% <br /> Recovery 104 108 109 106 <br /> ° Recovery <br /> Control Limits 71-133 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 is an aliquot of sample <br /> fortified with known quantities of specific compounds and subjected to the entire analytical procedure If <br /> esignature on File the recovery of analytes from the matrix spike does not fall within specified control limits due to matrix <br /> Interference,the LCS recovery is to be used to validate the batch <br /> Alan B Kemp <br /> Project Manager <br /> 4110522 MPD <4> <br />