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Sequoia 680 Chesapeake Drive Redwood City,CA 94063 (415) 364 9600 FAX(415) 364 9233 r <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 /> OPIDS Services Client Project ID Unocal #0123, 1034 Central Ave, Tracy <br /> 2401 Stanwell Dr , Ste 300 Matrix Liquid <br /> Concord, CA 94520 <br /> Attention Jarrel Crider QC Sample Group 6060860-865 Reported Jun 21, 1996 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Benzene Toluene Ethyl Xylenes Diesel <br /> Benzene <br /> Method EPA 8020 EPA 8020 EPA 8020 EPA 8020 EPA 8015 <br /> Analyst S Chullakorn S Chullakorn S Chullakorn S Chullakorn J Dinsay <br /> MS/MSD <br /> Batch# 6060919 6060919 6060919 6060919 BI-K061295 <br /> Date Prepared 6/14/96 6/14/96 6/14/96 6/14/96 6/12/96 <br /> Date Analyzed 6/14/96 6/14/96 6/14/96 6/14/96 6/13/96 <br /> Instrument I D # HP-11 HP 11 HP-11 HP-11 HP-313 <br /> Conc Spiked 20 ug/L 20 ug/L 20 ug/L 60 ug/L 300 ug/L <br /> Matrix Spike <br /> % Recovery 100 90 95 93 153 <br /> • Matrix Spike <br /> Duplicate% <br /> Recovery 115 100 105 105 153 <br /> Relative% <br /> Difference 14 11 10 12 00 <br /> LCS Batch# 11 LCS061496 11 LCS061496 11 LCS061496 11 LCS061496 LCS061296 <br /> Date Prepared 6/14/96 6/14/96 6/14/96 6/14/96 6/12/96 <br /> Date Analyzed 6/14/96 6/14/96 6/14/96 6/14/96 6/12/96 <br /> Instrument I D # HP-11 HP-11 HP-11 HP-11 HP-313 <br /> LCS % <br /> Recovery 110 95 105 103 147 <br /> % Recovery <br /> Control Limits 60-140 60-140 60-140 60-140 50-150 <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 /> Wature 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 /> 6060860 MPD <4> <br />