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.+ ✓ <br /> Sequoia 680 Chesapeake Dnve Redwood City,CA 94063 (415) 364 9600 FAX(415) 364 9233 <br /> la) 404 N Wiget Lane Walnut Creek CA 94598 (510) 988 9600 FAX(510)988 9673 <br /> Iwo Analytical 819 Striker Avenue Suite 8 Sacramento CA 95834 (916) 921 9600 FAX(916)921 0100 <br /> 4RPD8 Services Client Project ID Unocal #0187, 437 E Miner Ave, Stockton <br /> 2401 Stanwell Dr , Ste 300 Matrix Liquid <br /> Concord, CA 94520 <br /> Attention Jarrel Crider QC Sample Group 6050647-657 Reported May 22, 1996 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Benzene Tuolene Ethyl Xylenes <br /> Benzene <br /> Method EPA 8020 EPA 8020 EPA 8020 EPA 8020 <br /> Analyst S Chullakorn S Chullakorn S Chullakorn S Chullakorn <br /> MS/MSD <br /> Batch# 6050651 6050651 6050651 6050651 <br /> Date Prepared 5/14/96 5/14/96 5/14/96 5/14/96 <br /> Date Analyzed 5/14/96 5/14/95 5/14/96 5/14/96 <br /> Instrument I D # HP 9 HP-9 HP-9 HP-9 <br /> Cone Spiked 20 pg/L 20,ug/L 20 ug/L 20 pg/L <br /> Matrix Spike <br /> % Recovery 90 100 105 102 <br /> isMatrix Spike <br /> Duplicate % <br /> Recovery 90 95 100 102 <br /> Relative % <br /> Difference 00 51 49 00 <br /> LCS Batch# 9LCS051496 9LCS051496 9LCS051496 9LCS051496 <br /> Date Prepared 5/14/96 5/14/96 5/14/96 5/14/96 <br /> Date Analyzed 5/14/96 5/14/96 5/14/96 5/14/96 <br /> Instrument I D # HP-9 HP 9 HP-9 HP-9 <br /> LCS % <br /> Recovery 100 110 115 115 <br /> Recovery <br /> Control Limits 70-130 70-130 70-130 70-130 <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 /> 0gnature 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 /> 6050647 MPD <3> <br />