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Sequoia 680 Chesapeake Dnve Redwood City, CA 94063 (415) 364 9600 FAX(415) 364 9233 <br /> 404 N Wiget Lane Walnut Creek,CA 94598 (510) 988 9600 FAX(510)988 9673 <br /> Analytical 819 Striker Avenue,Suite 8 Sacramento,CA 95834 (916) 921 9600 FAX(916) 921 0100 <br /> Onviros Client Project ID Shell 4315 Waterloo, Stockton <br /> 270 Perkins Ave Matrix Solid <br /> u`Sonoma, CA 95476 <br /> Attention Joe Neely Work Order# 9602H91 -01 -03 Reported Mar 22, 1996 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte Benzene Toluene Ethyl Xylenes <br /> Benzene <br /> QC Batch#: GCO22996BTE(EXA GCO22996BTEXEXA GCO22996STEXEXA GCOM96BTEXEXA <br /> Analy Method EPA 8020 EPA 8020 EPA 8020 EPA 8020 <br /> Prep. Method. EPA 5030 EPA 5030 EPA 5030 EPA 5030 <br /> Analyst E Cuanan E Cuanan E Cuanan E Cuanan <br /> MS/MSD # 96021195-03 9602E95-03 9602E95-03 9602E95-03 <br /> Sample Conc N D N D N D N D <br /> Prepared Date 2/29/96 2/29/96 2/29/96 2/29/96 <br /> Analyzed Date. 2/29/96 2/29/96 2/29/96 2/29/96 <br /> Instrument I D # GCHP1 GCHP1 GCHP1 GCHP1 <br /> Conc Spiked 0 20 mg/kg 0 20 mg/kg 0 20 mg/kg 0 60 mg/kg <br /> Result 020 020 020 060 <br /> MS % Recovery. 100 100 100 100 <br /> Dip Result 021 021 021 062 <br /> MSD % Recov 105 105 105 103 <br /> RPD 49 49 49 33 <br /> RPD Limit 0-50 0-50 0-50 0-50 <br /> LCS#- GBLK0229969S GBLK022996BS BLK0229968S GBLK022996BS <br /> Prepared Date. 2/29/96 2/29/96 2/29/96 2/29/96 <br /> Analyzed Date 2/29/96 2/29/96 2/29/96 2/29/96 <br /> Instrument I D #. GCHP1 GCHP1 GCHP1 GCHP1 <br /> Conc Spiked 0 20 mg/kg 0 20 mg/kg 0 20 mg/kg 0 60 mg/kg <br /> LCS Result 020 021 021 061 <br /> LCS % Recov: 100 105 105 102 <br /> LCS <br /> Control Limits 50-150 50-150 50-150 50-150 <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 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 fail within specified control limits due to matrix <br /> Interference,the LCS recovery is to be used to validate the batch <br /> !Mlie Gregory <br /> Project Manager MS=Matrix Spike,MSD=MS Duplicate,RPD=Relative%Difference 9602E-191 EEE <3> <br />