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4' t 1) Sequoia 680 Chesapeake Drive 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 /> �Il>� Analytical 819 Straker Avenue,Suite 8 Sacramento CA 95834 (916) 921 9600 FAX(916)921 0100 <br /> Envlros r Client Project ID Shell 141 N EI Dorado, Stock <br /> 270 Perkins Ave Matrix Solid <br /> Sonoma, CA 95476 <br /> Attention Joe Neely Work Order# 9604470 -01 -09, 11-14 Reported Apr 22, 1996 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte Benzene Toluene Ethyl Xylenes <br /> Benzene <br /> OC Batch#. GC040996BTEXDCB G0040996BTEXEXB GC040996BTEXEXB GC040996BTEXEXB <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 Cunanan E Cunanan E Cunanan E Cunanan <br /> MS/MSD# 9604398-03 9604398-03 9604398-03 9604398-03 <br /> Sample Cone - N D N D N D N D <br /> Prepared Date: 4/9/96 4/9/96 4/9/96 4/9/96 <br /> Analyzed Date- 4/9/96 4/9/96 4/9/96 4/9/96 <br /> Instrument 1.13 #: GCHP1 GCHP1 GCHP1 GCHP1 <br /> Cone. Spiked- 0 20 mg/kg 0 20 mg/kg 0 20 mg/kg 0 60 mg/kg <br /> Result. 017 018 018 052 <br /> MS % Recovery: 85 90 90 87 <br /> Dup Result- 017 017 017 051 <br /> MSD% Recov.. 85 85 85 85 <br /> RPD 00 57 57 19 <br /> RPD Limit 0-50 0-50 0-50 0-50 <br /> LCS#- GBLK0409968SB GBLK040996BSB GBLK040996BSB GBLK040996BSB <br /> Prepared Date 4/9/96 4/9/96 4/9/96 4/9/96 <br /> Analyzed Date- 4/9/96 4/9/96 4/9/96 4/9/96 <br /> Instrument I D # GCHP1 GCHP1 GCHP1 GCHP1 <br /> Cone. Spiked: 0 20 mg/kg 0 20 mg/kg 0 20 mg/kg 0 60 mg/kg <br /> LCS Result: 019 019 019 055 <br /> LCS % Recov.. 95 95 95 92 <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 /> Mike Gregory <br /> Project Manager **MS=Matrix Spike,MSD=MS Duplicate,RPD=Relative%Difference 9604470 EEE <1> <br />