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680 Chesapeake Drive Redwood City CA 94063 (650)364-9600 FAX(650)364-9233 <br /> 1 Sequoia 404 N MASet Lane Walnut Creek CA 94598 (925)988-9600 FAX(925)988-9673 <br /> 819 Striker Avenue Suite 8 Sacramento CA 95834 (9 t 6)921-9600 FAX(916)921-0100 <br /> Analytical 1551 Indclstriall BlvRoad San <br /> North Ste D Petaluma s 94954 70-4111 (650)23Z-9865 FAX(707)792-034Z <br /> 600 FAX(650)232-9612 <br /> levironmental Resolutions Client Project ilk r=RI 205504-r7/r0SCo#5886 A 4 <br /> 74 Digital Dr, Ste 100 Matrix Liquid <br /> Novato, CA 94949 <br /> Attention Keith Romstad QC Sample Group 9050543-544 Reported May 21, 1999 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte Benzene Toluene Ethyl Xylenes MTBE <br /> Benzene <br /> QC Batch# GCO51299 GC051299 GC051299 GC051299 MS051299 <br /> 802005A 802005A 802WSA 802WSA 8260S2A <br /> Analy Method. EPA 8020 EPA 8020 EPA 8020 EPA 8020 EPA 8260 <br /> Prep Method EPA 5030 EPA 5030 EPA 5030 EPA 5030 EPA 5030 <br /> Analyst D Newcomb D Newcomb D Newcomb D Newcomb N Nelson <br /> MS/MSD# 9050440 9050440 9050440 9050440 9050393 <br /> Sample Conc . N D N D N D N D N D <br /> Prepared Date 5/12/99 5/12/99 5/12/99 5/12/99 5/13/99 <br /> Analyzed Date 5/12/99 5/12/99 5/12/99 5/12/99 5/13/99 <br /> Instrument I D # HP-5 HP-5 HP-5 HP-5 GC/MS-2 <br /> Cone Spiked* 20pg/L 20Yg/L 20Ng/L 60Ng/L 50Yg/L <br /> Result 17 18 18 56 30 <br /> MS % Recovery 85 90 90 93 60 <br /> ISDup Result 17 18 18 56 31 <br /> ISD % Recov 85 90 90 93 62 <br /> RPD 00 00 00 00 33 <br /> RPD Limit 0-20 0-20 0-20 0-20 0-25 <br /> LCS# 5LCS051299 5LCS051299 5LCS051299 5LCS051299 LCS051299 <br /> Prepared Date 5/12/99 5/12/99 5/12/99 5/12/99 5/12/99 <br /> Analyzed Date 5/12/99 5/12/99 5/12/99 5/12/99 5/12/99 <br /> Instrument I D# HP-5 HP 5 HP-5 HP-5 GC/MS-2 <br /> Cone Spiked 20pg/L 20pg/L 20Ng/L 60pg/L 50pg/L <br /> LCS Result 17 17 17 54 60 <br /> LCS % Recov ' 85 85 85 90 120 <br /> LCS 70-130 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 /> tEQ41A 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 recove is to be used to validate the batch <br /> Ke p *"MS=Matrix Spike,MSD=MS Duplicate,RPD=Relative%Difference <br /> t (rector <br /> 9050543 ENR <8> <br /> tf] <br />