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• / \ Sequoia 680 Chesapeake Drive Redwood Cry, 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)92 1-0 100 <br /> Envlros Client Project ID Shell 4315 Waterloo, Stockton <br /> 270 Perkins Ave Matrix Solid <br /> Sonoma, CA 95476 <br /> Attention Joe Neely Work Order# 9602G24 -01 -03 Reported Mar 1, 1996 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte Benzene Toluene Ethyl Xylenes <br /> Benzene <br /> OC Batch#. GCO22796STEXEXA GCO22796BTEXEKA GCO22796STEXEXA GCO22796BTEXEXA <br /> Analy Method EPA 8020 EPA 8020 EPA 8020 EPA 8020 <br /> Prep. Method EPA 5030 EPA 5030 EPA 5030 EPA 5030 <br /> Analyst A.Maralit A.Maralit A. Maralit A.Maralit <br /> MS/MSD# 9602842-05 9602842-05 9602B42-05 9602B42-05 <br /> Sample Cone.: N D N D N D N D <br /> Prepared Date 2/27/96 2/27/96 2/27/96 2/27/96 <br /> Analyzed Date 2/27/96 2/27/96 2/27/96 2/27/96 <br /> Instrument I D # GCHP18 GCHP18 GCHP18 GCHP18 <br /> Cone Spiked. 0 20 mg/kg 0 20 mg/kg 0 20 mg/kg 0 60 mg/kg <br /> Result. 019 019 019 0 57 <br /> MS % Recovery 95 95 95 95 <br /> Dup. Result 018 019 019 046 <br /> MSD % Recov: 90 95 95 77 <br /> RPD' 54 00 00 21 <br /> RPD Limit 0-50 0.50 0-50 0-50 <br /> LCS# GBLK022796BS-A GBLK022796BS-A GBLK022796BS-A GBLK022796BS-A <br /> Prepared Date, 2/27/96 2/27/96 2/27/96 2/27/96 <br /> Analyzed Date: 2/27/96 2/27/96 2/27/96 2/27/96 <br /> Instrument LD #: GCHP18 GCHP18 GCHP18 GCHP18 <br /> Cone Spiked: 0 20 mg/kg 0 20 mg/kg 0 20 mg/kg 0 60 mg/kg <br /> LCS Result: 020 020 020 0 60 <br /> LCS % Recon 100 100 100 100 <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 fall within specified control limits due to matrix <br /> interference,the LCS recovery is to be used to validate the batch <br /> Ike Gregory <br /> Project Manager **MS=Matrix Spike, MSD=MS Duplicate,RPD=Relative%Difference 9602G24 EEE <1> <br />