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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 /> ID <br /> qwr Analytical 819 Striker Avenue Suite 8 Sacramento CA 95834 (916) 921 9600 FAX(916)921 0100 <br /> 18MPDS 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 OC Sample Group 6011538-553 Reported Feb 9, 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 S Chullakorn S Chullakorn S Chullakorn S Chullakorn <br /> MS/MSD <br /> Batch# 6011540 5011540 6011540 6011540 <br /> Date Prepared 2/6/96 2/6/96 2/6/96 2/6/96 <br /> Date Analyzed 2/6/96 2/6/x6 2/6/96 2/6/96 <br /> Instrument I D # HP-9 HP-9 HP-9 HP-9 <br /> Conc Spiked 20pg/L 20pg/L 20ug/L 60 jug/L <br /> Matrix Spike <br /> % Recovery 105 100 100 103 <br /> Matrix Spike <br /> Duplicate% 105 100 100 103 <br /> Recovery <br /> Relative% <br /> Difference 00 00 00 00 <br /> LCS Batch# 4LCS020696 4LCS020696 4LCS020696 4LCS020696 <br /> Date Prepared 2/6/96 2/6/96 2/6/96 2/6/96 <br /> Date Analyzed 2/6/96 2/6/96 2/6/96 2/6/96 <br /> Instrument I D # HP-9 HP-9 HP-9 HP-9 <br /> LCS % <br /> Recovery 95 95 90 93 <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 /> Akinature 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 /> 6011538 MPD ¢5> <br />