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i k <br /> 680 Chesapeake Drive Redwood City CA 94063 (650)364-9600 FAX(650)3649233 <br /> Sequoia 404 N WiSet Lane Walnut Creek CA 94598 (925)988-9600 FAX(925)988-9673 <br /> 819 Striker Avenue Suite 8 Sacramento CA 95834 (916)921-9600 FAX(916)921-0100 <br /> Analytical 1455 McDowell Blvd North Ste D Petaluma,CA 94954 (707)79Z-1865 FAX(707)792-0342. <br /> 1551 Industrial Road San Carlos CA 94070-4111 (650)232-9600 FAX(650)232-9612 <br /> Gettler-Ptyan'- Dublin Y Client Project it) ' Unacal 88#0123, Tracj+ <br /> 6747 Sierra Court, Suite J Matrix Liquid j <br /> Dublin, CA 94568 <br /> Attention Deanna Harding QC Sample Group 9061307-313 Reported Jun 30, 1999 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE 1,1-Dichloro- Trichloro- Chloro- Diesel <br /> ethene ethene benzene <br /> Method EPA 8010 EPA 8010 EPA 8010 EPA 8015 <br /> Analyst P Kosovskaya P Kosovskaya P Kosovskaya K Grubb <br /> MS/MSD <br /> Batch# 9061308 9061308 9061308 BLK061799C <br /> Date Prepared 6/18/99 6/18/99 6/18/99 6/17/99 <br /> Date Analyzed 6/18/99 6/18/99 6/18/99 6/18/99 <br /> Instrument I D #- HP-6 HP-6 HP-6 HP-3A <br /> Conc Spiked 20ug/L 20ug/L 20ug/L 500 ug/L <br /> Matrix Spike <br /> % Recovery 8o 95 85 92 <br /> Matrix Spike <br /> Duplicate % <br /> Recovery 85 100 90 68 <br /> Relative <br /> Diff@rence 61 51 57 30 <br /> LCS Batch# LCS061899 LCS061899 LCS061899 LCS061799C <br /> Date Prepared 6/18/99 6/18/99 6/18/99 6/17/99 <br /> Date Analyzed 6/18/99 6/18/99 6/18/99 6/18/99 <br /> Instrument I D # HP 6 HP 6 HP-6 HP-3A <br /> LCS % <br /> Recovery 75 95 95 100 <br /> Recovery <br /> Control Limits 65 135 70-130 70-130 35-125 <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 /> d�G I - /'' ��` Gl l 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 /> panne Fegley <br /> Project Manager <br /> 9061307 GET <11> <br />