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= i4 <br /> 1 � 680 Chesapeake Drive Redwood City CA 94063 (650)364-9600 FAX(650) 364-9233 <br /> Sequoia 404 N Wiget Lane Walnut Creek CA 94598 (9Z5)988-9600 FAX(925)988-9673 <br /> 819 Striker Avenue Suite 8 Sacramento CA 95834 (916)921-9600 FAX(916)92 1-0 100 <br /> 455 McDowell Blvd North Ste D Petaluma CA 94954 (707) 792-1865 FAX(707) 792-0342 <br /> Analytical '1551 Industrial Road San Carlos CA 94070-4111 (650) 232-9600 FAX(650) 232-9612 <br /> Oequoia Analytical Client Project ID L905535-TRMI EH&S <br /> 1551 Industrial Blvd Matrix Liquid <br /> San Carlos, CA 94070 <br /> Attention Mike Gregory QC Sample Group 9060199-213 Reported Jun 21, 1999 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte Benzene Toluene Ethyl Xylenes <br /> Benzene <br /> QC Batch# GCO60399 GCO60399 GCO60399 GC060399 <br /> 802004A 802004A 802004A 802004A <br /> Analy Method EPA 8020 EPA 8020 EPA 8020 EPA 8020 <br /> Prep Method EPA 5030 EPA 5030 EPA 5030 EPA 5030 <br /> AnalystJ Minkel J Minkel J Minkel J Minkel <br /> MS/MSD # 9052427 9052427 9052427 9052427 <br /> Sample Conc N D ND N D N D <br /> Prepared Date 06/03/99 06/03/99 06/03/99 06/03/99 <br /> Analyzed Date 06/03/99 06/03/99 06/03/99 06/03/99 <br /> Instrument I D # HP-4 HP-4 HP 4 HP-4 <br /> Conc Spiked 20 pg/L 20,ug/L 20 jig/L 60 pg/L <br /> Result 21 17 18 61 <br /> MS % Recovery 105 85 90 102 <br /> 0Dup Result 21 17 18 60 <br /> MSD % Recov 105 85 90 100 <br /> RPD 00 00 00 17 <br /> RPD Limit 0-20 0-20 0-20 0-20 <br /> LCS # 4LCS060399 4LCS060399 4LCS060399 4LCS060399 <br /> Prepared Date 06/03/99 06/03/99 06/03/99 06/03/99 <br /> Analyzed Date 06/03/99 06/03/99 06/03/99 06/03/99 <br /> Instrument I D # HP-4 HP-4 HP-4 HP-4 <br /> Conc Spiked 20,ug/L 20 ftg/L 20 pg/L 60 jig/L <br /> LCS Result 22 18 19 63 <br /> LCS % Recov 110 90 95 105 <br /> LCS 70-130 70-130 70-130 70-130 <br /> Control Limits <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 /> 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 /> arlie WeStWater Mb = Matrix 6pike, MbU = Mb Uuplicate, HPD = e ative Difference <br /> Project Manager <br /> 9060199 SSS ¢5> <br />