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/ ����®�� 680 Chesapeake Drive Redwood City CA 94063 1650)364-9600 FAX(650) 364-9233 <br /> ■ 404 N Wiget Lane Walnut Creek CA 94598 (925)988-9600 FAX(925)986-9673 <br /> 819 Striker Avenue Suite 8 Sacramento CA 95834 (916)921-9600 FAX(916)921-0100 <br /> 4: Analytical <br /> 1455 McDowell Blvd North Ste D Petaiuma CA 94954 (707)792-1865 FAX(707) 792-0342 <br /> 1551 Industrial (toad San Carlos CA 94070-4111 (650)232-9600 FAX(650)232-9612 <br /> JWlaine <br /> Tech Services Client Project ID Chevron #9-9840, Stockton <br /> 680 Rogers Avenue Matrix Liquid <br /> San Jose CA 95112 <br /> Attention Christine Lillie QC Sample Group 9061129-132 Reported Jun 28, 1999 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte Benzene Toluene Ethyl Xylenes MTBE Methanol <br /> Benzene <br /> QC Batch# GC061899 GCO61899 GCO61899 GCO61899 MS062399 9060357 <br /> 802002A 802002A 802002A 802002A 8260S2A <br /> Analy Method EPA 8020 EPA 8020 EPA 8020 EPA 8020 EPA 6260 EPA 801 SM <br /> Prep Method EPA 5030 EPA 5030 EPA 5030 EPA 5030 EPA 5030 EPA 50308 <br /> Analyst J Minkel J Minkel J Minkel J Minkel N Nelson Morgan HIII <br /> MS/MSD # 9061092 9051092 9061092 9061092 9061102 BLK062399 <br /> Sample Conc N D N D N D N D N D N D <br /> Prepared Date 6/18/99 6/18/99 6/18/99 6/18/99 6/23/99 6/23/99 <br /> Analyzed Date 6/18/99 6/18/99 6/18/99 6/18/99 6/24/99 6/23/99 <br /> Instrument I D # HP-2 HP-2 HP-2 HP-2 GC/MS-2 - <br /> Conc Spiked 20 ug/L 20 ug/L 20 ug/L 60 ug/L 50 ug/L 8 0 mg/L <br /> Result 19 17 18 59 48 84 <br /> MS % Recovery 95 85 90 98 96 104 <br /> Dup Result 19 18 18 59 54 78 <br />• MSD % Recov 95 90 90 98 108 97 <br /> RPD 00 57 00 00 12 66 <br /> RPD Limit 0-20 0-20 0-20 0-20 0-25 0-50 <br /> LCS # 2LCS061899 2LCS061899 2LCS061899 2LCS061899 LCS062499 - <br /> Prepared Date 6/18/99 6/18/99 6/18/99 6/18/99 6/24/99 <br /> Analyzed Date 6/18/99 6/18/99 6/18/99 6/18/99 6/24/99 <br /> Instrument I D # HP-2 HP-2 HP-2 HP-2 GC/MS-2 <br /> Conc Spiked 20ug/L 20ug/L 20ug/L 60ug/L 50ug/L <br /> LCS Result 20 18 18 61 55 <br /> LCS % Recov 100 90 90 102 110 - <br /> LCS 70-130 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 /> SEQUOIA ANALYTICAL, #1271 preparation,and analytical methods employed for the samples The matrix spike is an aliquot of sample <br /> #1 10 fortified with known quantities of specific compounds and subjected to the entire analytical procedure If <br /> r overy of analytes from the matrix spike does not fail within specified control limits due to matrix <br /> interference,the LCS recove is to be used to validate the batch <br />'Melissa A Brewer **M.5=Matrix Spike MSO=MS Duplicate, RPD=Relative% Difference <br /> Project Manager <br /> 9061129 BTS <9> <br />