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Sequoia680 Chesapeake Drive Redwood City,CA 94063 (415) 364 9600 FAX(415) 364 9233 <br /> 404 N Wig,--t Lane Walnut Creek CA 94598 (510) 988 9600 FAX(510)988 9673 <br /> Analytical 819 Striker Avenue Suite 8 Sacramento CA 95834 (916) 921 9600 FAX(916)921 0100 <br /> �,ff <br /> 1*MPDS Services Client Project ID Unocal #6981 4707 Pacific Ave Stockton <br /> 2401 Stanwell Dr, Ste 300 Matrix Liquid <br /> Concord, CA 94520 <br /> Attention Jarrel Crider QC Sample Group 6071861-872 Reported Aug 7, 1996 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Benzene Toluene Ethyl Xylenes <br /> Benzene <br /> I <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# 6071539 6071539 6071539 6071539 <br /> Date Prepared 7/29/96 7/29/96 7/29/96 7/29/96 <br /> Date Analyzed 7/29/96 7/29/96 7/29/96 7/29/96 <br /> Instrument I D # HP-11 HP-11 HP-11 HP-11 <br /> Cone Spiked 20pg/L 20pg/L 20pg/L 60Ng/L <br /> Matrix Spike <br /> % Recovery 115 97 105 101 <br /> Matrix Spike <br /> Duplicate% <br /> Recovery 100 82 95 89 <br /> Relative% <br /> Difference 14 17 10 12 <br /> LCS Batch# 11 LCS072996 11 LCS072996 11 LCS072996 11 LCS072996 <br /> Date Prepared 7/29/96 7/29/96 7/29/96 7/29/96 <br /> Date Analyzed 7/2,9/96 7/29/96 7/29/96 7/29/96 <br /> Instrument I D # HP-11 HP-11 HP-11 HP-11 <br /> LCS % <br /> Recovery 115 95 105 102 <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 1s 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 /> Signature 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 recove is to be used to validate the batch <br /> Project Manager <br /> 6071861 MPD <7> <br />