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• 680 Chesapeake Drive Redwood City CA 94063 (650)364-9600 FAX(650)364-9233 <br /> Sequoia 404 N eget1e Walnut Creek CA 94598 (925)988 9600 FAX(925)988-9673 <br /> 8l9 Striker Avenue Suite 8 Sacramento CA 95834 (916)921-9600 FAX(916)92l-0100 <br /> 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 /> Weston, Inc Client Project ID San Joaquin HSA <br /> 2300 Clayton Rd , Ste 1580 Matrix Liquid <br /> Concord, CA 94520 <br /> Attention Scott Lookingvill OC Sample Group 9051692-696 Reported Jun 1, 1999 <br />' QUALITY CONTROL DATA REPORT <br />' Analyte. Benzene Toluene Ethyl Xylenes <br /> Benzene <br /> QC Batch# GCO52499 GC052499 GCO52499 GC052499 <br />' 802004A 602004A 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 /> tAnalyst J Minkel J Minkel J Minkel J Minkel <br /> MS/MSD #: 9051693 9051693 9051693 9051693 <br /> Sample Cone NO ND N D N D <br /> Prepared Date: 5/24/99 5/24/99 5/24/99 5/24/99 <br />' Analyzed Date 5/24/99 5/24/99 5/24/99 5/24/99 <br /> Instrument I D # HP-4 HP-4 HP-4 HP-4 <br /> Cone Spiked- 20ug/L 20ug/L 20ug/L song/L <br />' Result- 19 16 17 59 <br /> MS % Recovery 95 80 85 98 <br /> t Dup Result 20 17 18 60 <br /> MSD % Recov .. 100 85 90 100 <br /> RPD- 51 61 57 17 <br /> RPD Limit 0-20 0-20 0-20 0-20 <br />' LCS # 4LCS052499 4LCS052499 4LCS052499 4LCS052499 <br /> Prepared Date 5/24/99 5/24/99 5/24/99 5/24/99 <br />' Analyzed Date 5/24/99 5/24/99 5/24/99 5/24/99 <br /> Instrument I D # HP-4 HP-4 HP-4 HP 4 <br /> Cone Spiked 20 ug/L 20 ug/L 201ig/L 60 ug/L <br />' LCS Result 19 16 17 59 <br /> LCS % Recov 95 80 85 98 <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 /> J lianne Fegley *"MS=Matrix Spike MSD=MS Duplicate, RPD=Relative%Difference <br /> roject Manager <br />' 9051692 RFW <2> <br />