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Sequoia 680 Chesapeake Dnve Redwood City CA 94063 (650) 364 9600 FAX (650)364 9233 <br /> 404 N Wiget Lane Walnut Creek CA 94598 (510) 988 9600 FAX(510)988 9673 <br /> 4 ID I Analytical 819 Sinker Avenue,Suite$ Sacramento, CA 95834 (916) 921-9600 FAX(916)92j,'15100 „z <br /> Blaine Tech Services, Inc Client Project ID Shell Stockton /970805-S1 <br /> 1680 Rogers Avenue Matrix Liquid <br /> San Jose, CA 95112 <br /> Attention Fran Thie Work Order# 9708341 -01, 02 Reported Aug 13, 1997 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte TCE p-Xylene <br /> QC Batch# GCO811971SHSHSA GCO811971SHSHSA <br /> Analy Method ISHS ISHS <br /> Prep Method HS HS <br /> Analyst T Tran T Tran <br /> MS/MSD # 970816801 970816801 <br /> Sample Conc N D N D <br /> Prepared Date 8/11/97 8/11/97 <br /> Analyzed Date 8/11/97 8/11/97 <br /> Instrument I D # GCv1 GCv1 <br /> Conc Spiked 1 0 mg/L 0 20 mg/L <br /> Result 096 015 <br /> MS % Recovery 96 75 <br /> Dup Result 079 015 <br /> MSD % Recov 79 75 <br /> RPD 19 00 <br /> RPD Limit 0-40 0-40 <br /> n n —, nv, ,w--; <br /> LCS # BLK081197 BLK081197 <br /> Prepared Date 8/11/97 8/11/97 <br /> Analyzed Date 8/11/97 8/11/97 <br /> Instrument I D # GCv1 GCv1 <br /> Conc Spiked 1 0 mg/L 0 20 mg/L <br /> LCS Result 096 018 <br /> LCS % Recov 96 90 <br /> 50-150 50-150 <br /> LCS 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 LNALYTICAL 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 <br /> the recovery of analytes from the matrix spike does not fall within specified control limits due to math <br /> interference,the LCS recovery is to be used to validate the batch <br /> Peggy Pennell **MS=Matrix Spike, MSD=MS Duplicate, RPD=Relative%Difference <br /> Project Man of Page 2 of 2 9708341 BLA <2> <br />