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Sequoia 680 Chesapeake Drive Redwood City CA 94063 (650)364-9600 FAX(650)364-9233 <br /> 4D 404 N Wlget lane Walnut Creek CA 94598 (925)988-9600 FAX(925)988-%73 <br /> filly Analytical 819 Striker Avenue Suite 8 Sacramento,CA 95834 (9t6)921-9600 FAX(916)921-0100 <br /> 1455 McDowell Blvd North Ste D Petaluma CA 94954 (707)792-1865 FAX(707)792-0342 <br /> Aftttler-Ryan- Dubiin Client protect 11) Unocal SS#5098, Stockton <br /> W47 Sierra Court, Suite J Matrix Liquid <br /> Dublin, CA 94,968 <br /> Attention Deanna Harding QC Sample Group 8122064-072 Reported Jan 13, 1999 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE 1,1-Dichloro- Trichloro- Chloro- MTBE Methanol Methanol <br /> ethene ethene benzene <br /> Method EPA 8010 EPA 8010 EPA 8010 EPA 8260 ISH8 ISHS <br /> Analyst. N Nelson N Nelson N Nelson N Nelson H S T S <br /> MS/MSD <br /> Batch,#' 8121628 8121628 8121628 8122065 9812E78-01 9812C70-01 <br /> Date Prepared 12/30/98 12/30/98 12/30/98 1/5/99 12/30/98 12/31/98 <br /> Date Analyzed 12/30/98 12/30/98 12/30/98 1/5/99 12/30/98 12/31/98 <br /> Instrument I D # HP-6 HP-6 HP-6 GC/MS-2 GCV-01 GCV-01 <br /> Conc Spiked 20pg/L 20pg/L 20pg/L 50Ng/L 80mg/L 80mg/L <br /> Matrix Spike <br /> % Recovery 8o 85 85 114 36 39 <br />• Matrix Spike <br /> Duplicate % <br /> Recovery 100 105 100 104 43 36 <br /> Relative % <br /> Difference 22 15 11 92 35 35 <br /> my r <br /> LCS Batch# LCS123098 LCS123098 LCS123098 LCS010599 LCS2123098 LCS2123198 <br /> Date Prepared 12/30/98 12/30/98 12/30/98 1/5/99 12/30/98 12/31/98 <br /> Date Analyzed 12/30/98 12/30/98 12/30/98 1/5/99 12/30/98 12/31/98 <br /> Instrument I D # HP-6 HP-6 HP-6 GC/MS-2 GCv-01 GCv-01 <br /> LCS % <br /> Recovery. 100 95 95 100 93 95 <br /> Recovery <br /> Control Limits 65-135 70-130 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 /> & #1 10 fortified with known quantities of specific compounds and subjected to the entire analytical procedure If <br /> the recovery of analytes from the matrix spike does not fall within specified control limits due to matrix <br /> Interference,the LCS recove is to be used to validate the batch <br /> ullann=egley <br /> Project Manager <br /> 8122064 GET e23> <br />