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41)— Sequoia 680 Chesapeake Drive Redwood City, CA 94063 (415) 364 9600 FAX(415)364 9233 <br /> 1900 Bates Avenue,Suite L Concord CA 94520 (510) 686 9600 FAX (510)686 9689 <br /> Analytical 819 Striker Avenue,Suite 8 Sacramento,CA 95834 (916) 921 9600 FAX(916)921 0100 <br />�UlPOS. Services Client Project ID Unocal #5098, 5606 Pacific Ave, Stockton <br /> 2401 Stanwell Dr, Ste 400 Matrix Liquid <br /> Concord, CA 94520 <br /> Attention Avo Avedessian OC Sample Group 4061378-81 Reported Jul 13, 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 J Fontecha J Fontecha J Fontecha J Fontecha <br /> MS/MSD <br /> Batch# 4070337 4070337 4070337 4070337 <br /> Date Prepared 7/8/94 7/8/94 7/8/94 7/8/94 <br /> Date Analyzed 7/8/94 7/8/94 7/8/94 7/8/94 <br /> Instrument I D # HP-4 HP-4 HP-4 HP-4 <br /> Cone Spiked 201ig/L 20ug/L 20ug/L 60ug/L <br /> Matrix Spike <br /> % Recovery 85 105 90 102 <br />• Matrix Spike <br /> Duplicate% <br /> Recovery so 95 90 100 <br /> Relative% <br /> Difference 61 10 00 1 9 <br /> LCS Batch# 2LC8070894 2LOS070894 2LCS070894 2LC8070894 <br /> Date Prepared 7/8/94 7/8/94 7/8/94 7/8/94 <br /> Date Analyzed 7/8/94 7/8/94 7/8/94 7/8/94 <br /> Instrument I D # HP-4 HP-4 HP-4 HP-4 <br /> LCS % <br /> Recovery 84 92 94 97 <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 /> the recovery of analytes from the matrix spike does not fall within specified control limits due to matrix <br /> Interference,the LCS recoveryis to be used to validate the batch <br /> t� K <br /> Project Ma ager <br /> 4061378 MPD <8> <br />