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680 Chesapeake Dnve Redwood City CA 94063 (650)364 9600 FAX(650)364-9233 <br /> Sequoia 404 N Wiget Lane Walnut Creek CA 94598 (925)988-9600 FAX(925)988-9673 <br /> $19 Striker Avenue Suite 8 Sacramento CA 95834 (916)921-9600 FAX(9 16)921-0100 <br /> Analytical 1455 McDowell Btvd North Ste D Petaluma CA 94954 (707)792-E865 FAX(707)792-0342 <br /> 1551 Industrial Road San Carlos CA 94070-4111 (650)232-9600 FAX(650)232-9612 <br /> ettler-Ryan- Dublin ry Client Project ID Unocal SS#5098, Stockton <br /> 6747 Sierra Court, Suite J Matrix Liquid <br /> Dublin, CA 94568 <br /> Attention Deanna Harding OC Sample Group 9061562-579 Reporter! Jun 30, 1999 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE 1,1-Dichloro- Trichloro- Chloro- MTBE <br /> ethene ethene benzene <br /> Method EPA 8010 EPA 8010 EPA 8010 EPA 8260 <br /> Analyst P Kosovskaya P Kosovskaya P Kosovskaya N Nelson <br /> MS/MSD <br /> Batch# 9061564 9061564 9051564 9061576 <br /> Date Prepared 6/23/99 6/23/99 6/23/99 6/28/99 <br /> Date Analyzed 6/25/99 6/25/99 6/25/99 6/28/99 <br /> Instrument I D # HP-7 HP-7 HP-7 GC/MS-2 <br /> Conc Spiked 20 fug/L 20 Pg/L 20 pg/L 50 ug/L <br /> Matrix Spike <br /> % recovery 85 85 75 118 <br />. Matrix Spike <br /> Duplicate % <br /> Recovery 95 95 105 104 <br /> Relative% <br /> Difference 11 11 33 5 9 <br /> LCS Batch# LCS062399 LCS062399 LC3062399 LCS062899 <br /> Date Prepared 6/23/99 6/23/99 6/23/99 6/28/99 <br /> Date Analyzed 6/23/99 6/23/99 6/23/99 6/28/99 <br /> Instrument I D # HP-7 HP-7 HP 7 GC/MS-2 <br /> LCS % <br /> Recovery 90 90 90 116 <br /> Recovery <br /> Control Limits 65-135 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 /> r - 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 recovea is to be used to validate the batch <br /> IwUlianne Fegtey <br /> Project Manager <br /> 9061562 G ET <12> <br /> C.0 <br />