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Sequoia 680 Chesapeake Drive Redwood City,CA 94063 (415) 364 9600 FAX(415) 364 9233 <br /> 404 N Wiget 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 /> tD$ Services <br /> Client Project I© 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 6101466-468 Reported Nov 7, 1996 <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 N Zahedi N Zahedi N Zahedi N Zahedi <br /> MS/MSD <br /> Batch# 6110101 6110101 6110101 6110101 <br /> Date Prepared 11/6/96 11/6/96 11/6/96 11/6/96 <br /> Date Analyzed 11/6/96 11/6/96 11/6/96 11/6/96 <br /> Instrument I D # HP-2 HP-2 HP-2 HP-2 <br /> Conc Spiked 10pg/L 10jrg/L 10yg/L 30Pg/L <br /> Matrix Spike <br /> % Recovery 91 87 90 94 <br /> Matrix Spike <br /> Duplicate% <br /> Recovery 55 53 52 53 <br /> Relative% <br /> Difference 49 49 54 56 <br /> LCS Batch# LCS110696 LCS110696 LCS110696 LCS110696 <br /> Date Prepared 11/6/96 11/6/96 11/6/96 11/6/96 <br /> Date Analyzed 11/6/96 11/6/96 11/6/96 11/6/96 <br /> Instrument I D # HP-2 HP-2 HP-2 HP-2 <br /> LCS % <br /> Recovery 96 101 104 108 <br /> % Recovery <br /> Control Limits 60-140 60-140 60-140 60-140 <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, #2000 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 /> 09nature 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 /> 6101466 MPD <37 <br />