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Sequoia680 Chesapeake Drive Redwood CiM CA 94063 (650) 364-9600 FAX(650) 364 9233 <br /> 404 N Wgptt Lane Walnut Creek,CA 94598 (5t0) 988 9600 FAX(510) 988 9673 <br /> Analytical 819 Stnker Avenue,Suite 8 Sacramento,CA 95834 (916) 921-9600 FAX (916) 921 0100 <br /> low <br /> Envlros Client Project ID Shell Stockton <br /> 270 Perkins Ave Matrix Solid <br /> ,'Sonoma, CA 95476 <br /> Attention J Gaarder Work Order# 9709C12 -01-04 Reported Sep 30, 1997 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte Benzene Toluene Ethyl Xylenes Gas <br /> Benzene <br /> GSC Batch# GC092297STEXEXC GCO92297BTEXEXC GCO92297BTEXEXC GC092297BTEXEXC GCO92297STEXEXC <br /> Analy Method EPA 8020 EPA 8020 EPA 8020 EPA 8020 EPA 8016M <br /> Prep Method: EPA 5030 EPA 5030 EPA 5030 EPA 5030 EPA 5030 <br /> Analyst: A. Porter A Porter A Porter A.Porter A.Porter <br /> MS/MSD # 970961510 970961510 970961510 970961514 970961510 <br /> Sample Cone : N D N D N D N D N D <br /> Prepared Date 9/22/97 9/22/97 9/22/97 9/22/97 9/22/97 <br /> Analyzed Date. 9/22/97 9/22/97 9/22/97 9/22/97 9/22/97 <br /> Instrument I D #- GCHP22 GCHP22 GCHP22 GCHP22 GCHP22 <br /> Conc. Spiked 0 20 mg/Kg 0 20 mg/Kg 0 20 mg/Kg 0 60 mg/Kg 1 2 mg/Kg <br /> Result 015 016 016 047 090 <br /> MS % Recovery. 75 80 80 78 75 <br /> • Dup Result 015 016 016 047 10 <br /> MSD%Recov : 75 80 80 78 83 <br /> RPD 00 00 00 00 11 <br /> RPD Limit: 0-25 0-25 0-25 0-25 0-25 <br /> LCS #- BLK092297 BLK092297 BLK092297 BLK092297 BLK092297 <br /> Prepared Date 9/22/97 9/22/97 9/22/97 9/22/97 9/22/97 <br /> Analyzed Date: 9/22/97 9/22/97 9/22/97 9/22/97 9/22/97 <br /> Instrument LD # GCHP22 GCHP22 GCHP22 GCHP22 GCHP22 <br /> Cone Spiked 0 20 mg/Kg 0 20 mg/Kg 0 20 mg/Kg 0 60 mg/Kg 12 mg/Kg <br /> LCS Result 017 018 018 052 12 <br /> LCS %Recov .. 4 85 90 90 87 100 <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 Note <br /> The LCS is a control sample of known, interferent-free matrix that is analyzed using the same reagents, <br /> �EQU NALYTICAL 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 /> Fnterference,the LCS recovery is to be used to validate the batch <br /> Gregory <br /> Project Manager *"MS=Matrix Spike,MSD=MS Duplicate,RPD=Relative%Difference 9709C12EEE <1> <br />