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' 680 Chesapeake Drive Redwood City CA 94063 (650)364-9600 FAX(650) 3649233 <br /> a 404 N Wlget Lane Walnut Geek CA 94598 (925)988-9600 FAX(925)9$8-9673 <br /> Sequoi <br /> 819 5trlker Avenue Suite 8 Sacramento CA 95834 (916)921-9600 FAX(916)921-0100 <br /> 4D- Analytical 1455 McDowell Blvd North Ste D Petaluma CA 94954 (707)792-1865 FAX(707) 792 0342 <br /> 1551 industrial Road San Carlos CA 94070-4111 (650) 232-9600 FAX(650) 232-9612 <br />' oy F Weston, Inc Client Project ID San Joaquin HSA 2300 Clayton Rd , Ste 1580 Matrix Liquid <br /> Concord, CA 94520 <br /> Attention Scott Lookingbill QC Sample Group 9051686-691 Reported Jun 8, 1999 <br />' <br /> QUALITY CONTROL DATA REPORT <br />' Analyte' Benzene Toluene Ethyl Xylenes <br /> Benzene <br /> QC Batch#. GC052699 GC052699 GC052699 GC052699 <br />' 802005A 802005A 802005A 802005A <br /> Anally Method EPA 8020 EPA 8020 EPA 8020 EPA 8020 <br /> Prep Method EPA 5030 EPA 5030 EPA 5030 EPA 5030 <br />' <br /> Analyst. J Minkel J Minkel J Minkel J Minkel <br /> MS/MSD # 9051653 9051653 9051653 9051653 <br /> Sample Cone N D N D NO N D <br /> Prepared Date: 5/26/99 5/26/99 5/26/99 5/26/99 <br />' Analyzed Date 5/26/99 5/26/99 5/26/99 5/26/99 <br /> Instrument I D # HP-5 HP-5 HP-5 HP 5 <br /> Cone. Spiked 20pg/L 20pg/L 20pg/L 50pg/L <br />' Result 15 17 17 54 <br /> MS % Recovery 75 85 85 90 <br />' • Dup Result 15 17 17 54 <br /> MSD % Recov 75 85 85 90 <br /> RPD 00 00 00 00 <br />' RPD Limit 0-20 0-20 0-20 0-20 <br /> *L <br />' LCS # 5LCS052699 5LCS052699 5LCS052699 5LCS052699 <br /> Prepared Date 5/26/99 5/26/99 5/26/99 5/26/99 <br />' Analyzed Date 5/26/99 5/26/99 5/26/99 5/26/99 <br /> Instrument l D # HP-5 HP-5 HP-5 HP-5 <br /> Cone Spiked 20pg/L 20pg/L 20pg/L 60pg/L <br />' LCS Result 20 20 20 61 <br /> LCS % Recov 100 100 100 102 <br /> LCS 70-130 70-130 70-130 70130 <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 /> ianne Fegley **MS=Matrix Spike,MSD=MS Duplicate,RPD=Relative%Difference <br /> Project Manager <br />' 9051686 RFW t 2> <br />