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Op <br /> A 4 <br /> Sequoia 680 Chesapeake Drive Redwood City CA 94063 (650)364-9600 FAX(650)364-9233 <br /> 404 N Wiget Lane walnut Creek.CA 94598 (925)988-96M FAX(925)988-9673 <br /> ,� Analytical 819 Striker Avenue Suite 8 Sacramento CA 95834 (916)921-9600 FAX(916)921-0100 <br /> 1455 McDowell Blvd North Ste D Petaluma,CA 94954 (707)792-1865 FAX(707)792-0342 <br /> ttler-Ryan'- Dublin v Client Project ID Unocal SS#0123, Tracy <br /> 7 Sierra Court, Suite J Matrix Liquid <br /> ublin, CA 94568 <br /> Attention Deanna Harding OC Sample Group 9031666-672 Reported Apr 2, 1999 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE 1,1-Dichloro- Trichioro- Chloro- Diesel 1,1-Dichloro- Trichloro- Chloro <br /> ethene ethene benzene ethene ethene benzene <br /> Method EPA 8010 EPA 8010 EPA 8010 EPA 8015 EPA 8010 EPA 8010 EPA 8010 <br /> Analyst P Kosovskaya P Kosovskaya P Kosovskaya K Grubb P Kosovskaya P Kosovskaya P Kosovskaya <br /> MS/MSD <br /> Batch# 9031569 9031669 9031669 BLK031999 <br /> Date Prepared 3/29/99 3/29/99 3/29/99 3/19/99 <br /> Date Analyzed 3/30/99 3/30/99 3/30/99 3/23/99 <br /> Instrument LD # HP-6 HP 6 HP-6 HP-3A - - <br /> Conc Spiked 20Mg/L 20Ng/L 20yg/L 500 pg/L <br /> Matrix Spike <br /> % Recovery 120 130 110 78 - <br /> Matrix Spike <br /> Duplicate % <br /> -�� Recovery 105 115 105 84 - <br /> Relative % <br /> Difference: 13 12 47 74 - - - <br /> LCS Batch# LCS032999 LCS032999 LCS032999 LCS031999 LCS033099 LCS033099 LCS033099 <br /> Date Prepared: 3/29/99 3/29/99 3/29/99 3/19/99 3/30/99 3/30/99 3/30/99 <br /> Date Analyzed 3/29/99 3/29/99 3/29/99 3/23/99 3/30/99 3/30/99 3/30/99 <br /> Instrument 1 D # HP 6 HP-6 HP-6 HP-3A HP-6 HP-6 HP-6 <br /> LCS % <br /> Recovery: 80 $0 95 78 125 130 115 <br /> Recovery <br /> Control Limits: 65-135 70-130 70-130 35-125 65-135 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 /> • fortified with known quantities of specific compounds and subjected to the entire analytical procedure it <br /> �LyyK the recovery of analytes from the matrix spike does not fall within specified control limits due to matrix <br /> Interference,the LCS recoveryis to be used to validate the batch <br />*' u anne ley <br /> Project Manager <br /> 9031666 GET <12> <br />