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t Sequoia 680 Chesapeake Drive Redwood City CA 94063 (650)364-9600 FAX(650)364-9Z33 <br /> 404 N Wiget Lane Walnut Creek,CA 94598 (925)988-9600 FAX(925)988-9673 <br /> Analytical 819 Striker Avenue Suite 8 Sacramento CA 95834 (9 16)921-9600 FAX(916)921-0100 <br /> 1455 McDowell Blvd North Ste D Petaluma.CA 94954 (707)792-1865 FAX(707)792-0342 <br /> r6DYGK Weston, Inc Client Project Ib SJG - HSA <br /> x.300 Clayton Rd , Ste 1580 Matrix Liquid <br /> Concord, CA 94520 <br /> Attention Karla Brasaemle QC Sample Group 8091543-545 Reported Sep 30, 1998 <br />' QUALITY CONTROL DATA REPORT <br /> Analyte Benzene Toluene Ethyl Xylenes <br /> Benzene <br /> QC Batch# GCO92298 GC092298 GCO92298 GC092298 <br /> 802005A 802005A 802005A 802005A <br /> Analy Method EPA 8020 EPA 8020 EPA 8020 EPA 8020 <br /> Prep Method EPA 5030 EPA 5030 EPA 5030 EPA 5030 <br /> AnalystD Newcomb D Newcomb D Newcomb D Newcomb <br /> MS/MSD # 8091655 8091655 8091655 8091655 <br /> Sample Conc. N D ND ND ND <br /> Prepared Date 9/22/98 9/22/98 9/22/98 9/22/98 <br /> Analyzed Date 9/22/98 9/22/98 9/22/98 9/22/98 <br />' Instrument I D #- HP-5 HP-5 HP-5 HP-5 <br /> Conc. Spiked 20Ng/L 20pg/L 20,ug/L 60ftg/L <br /> Result 17 18 18 57 <br /> MS %Recovery 85 90 90 95 <br /> Dup Result 18 18 18 59 <br /> CO5D % Recov 90 90 90 98 <br /> APD 57 00 00 34 <br /> RPD Limit 0-20 0-20 0-20 0-20 <br /> 1 <br /> LCS # 5LCS092298 5LCS092298 5LCS092298 5LCS092298 <br /> Prepared Date 9/22/98 9/22/98 9/22/98 9/22/98 <br /> Analyzed Date 9/22/98 9/22/98 9/22/98 9/22/98 <br /> instrument I D # HP 5 HP 5 HP 5 HP 5 <br /> Conc Spiked 20pg/L 20Ng/L 20pg/L 60Ng/L <br />' LCS Result 19 20 20 62 <br /> LCS % Recov 95 100 100 103 <br /> LCS 70130 70130 70130 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 />�EQUOIA 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 /> ulianne Fegley '*MS=Matrix Spike,MSD=MS Duplicate RPD=Relative%Difference <br /> troject Manager <br /> 8091543 RFW <5n <br /> 1 <br />