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Sequoia 680 Chesapeake Drive Redwood City,CA 94063 (650) 364 9600 FAX(650)364 9233 <br /> 404N Wiget Lane Walnut Creek,CA 94598 (510) 988 9600 FAX(510)988 9673 <br /> 'Wr Analytical 81115) 9 Sinker Avenue,Sutte 8 Sacramento,CA 95834 (916) 925-9600 FAX(916)925 0100 <br /> Cambria Client Project ID Shell 2575 Country Club <br /> 270 Perkins Avenue Matrix Solid <br /> ,Sonoma, CA 95476 <br /> Attention Joe Neely Work Order# 9712C93 -01-08 Reported Jan 8, 1998 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte Benzene Toluene Ethyl Xylenes Gas <br /> Benzene <br /> QC Batch#' GC122397BTEXEXB GC122397BTEXEXB GC122397STEXEKB GC122397BTEXEXB GC122397BTEXEXB <br /> Analy Method EPA 8020 EPA 8020 EPA 8020 EPA 8020 EPA 8015M <br /> Prep. Method EPA 5030 EPA 5030 EPA 5030 EPA 5030 EPA 5030 <br /> Analyst J Minkel J Minkel J Minkel J Minkel J Minkel <br /> MS/MSD # 9712A6202 9712AB202 9712AS202 9712A6202 971ZA6202 <br /> Sample Conc : ND ND NO NO NO <br /> Prepared Date 12/23/97 12/23/97 12/23/97 12/23/97 12/23/97 <br /> Analyzed Date 12/24/97 12/24/97 12/24/97 12/24/97 12/24/97 <br /> Instrument I D # GCHP22 GCHP22 GCHP22 GCHP22 GCHP22 <br /> Conc Spliced 0 20 mg/Kg 0 20 mg/Kg 0 20 mg/Kg 0 60 mg/Kg 1 2 mg/Kg <br /> Result. 019 020 018 052 1 2 <br />�MS % Recovery 95 100 90 87 100 <br /> Dup. Result 020 019 019 055 1 2 <br /> [DASD % Recov : 100 95 95 92 100 <br /> RPD 51 51 54 56 00 <br /> RPD Limit 0-25 0-25 0-25 0-25 0-25 <br /> LCS # BLK122397 BLK122397 BLK12-2397 SLK122397 BLK122397 <br /> Prepared Date 12/23/97 12/23/97 12/23/97 12/23/97 12/23/97 <br /> Analyzed Date 12/24/97 12/24/97 12/24/97 12/24/97 12/24/97 <br /> Instrument I D # GCHP1 GCHP1 GCHP1 GCHP1 GCHP1 <br /> Conc Spiked 0 20 mg/Kg 0 20 mg/Kg 0 20 mg/Kg 0 60 mg/Kg 1 2 mg/Kg <br /> LCS Result. 018 017 017 049 11 <br /> LCS % Recov 90 85 85 82 92 <br /> 60-140 60-140 60-140 60-140 60-140 <br /> LCS 70-130 70-130 70-130 70-130 70-130 <br /> Control Limits <br /> Please!Vote <br /> The LCS is a control sample of known,interferent-free matrix that is analyzed using the same reagents, <br /> OSEQUOI ALYTICAL 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 /> I regory <br /> P jest Manager **MS=Matrix Spike, MSD=MS Duplicate, RPD=Relative%Difference 9712C93 CCC <1> <br />