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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 /> Analytical 819 Stnker Avenue,Suite 8 Sacramento CA 95834 (916) 921 9600 FAX (916)921 0100 <br /> w <br /> Envlros Client Project ID Shell 2575 Country Club, STK <br /> 270 Perkins Ave Matrix Solid <br /> Sonoma, CA 95476 <br /> Attention Joe Neely Work Order# 9701G29 -01-07 Reported Feb 12, 1997 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte Benzene Toluene Ethyl Xylenes <br /> Benzene <br /> QC Batch# GCO13197STEXEXA GCO13197BTEXEXA GC013197BTEXEXA GCO13197BTEXEXA <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.Porter A.Porter A. Porter A Porter <br /> MS/MSD # 9701D9108 9701D9108 9701D9108 970109108 <br /> Sample Cone N D N D N D N D <br /> Prepared Date. 1/31/97 1/31/97 1/31/97 1/31/97 <br /> Analyzed Date 1/31/97 1/31/97 1/31/97 1/31/97 <br /> Instrument I D # GCHP07 GCHP07 GCHP07 GCHP07 <br /> Cone Spiked: 0 20 mg/Kg 0 20 mg/Kg 0 20 mg/Kg 0 60 mg/Kg <br /> Result 016 016 0 17 0 50 <br /> MS % Recovery: 80 80 85 83 <br /> Dup Result 019 019 019 0 57 <br /> MSD % Recov .. 95 95 95 95 <br /> RPD 17 17 11 13 <br /> RPD Limit. 0-25 0-25 0-25 0-25 <br /> LCS # BLK013197 BLK013197 BLK013197 BLK013197 <br /> Prepared Date 1/31/97 1/31/97 1/31/97 1/31/97 <br /> Analyzed Date 1/31/97 1/31/97 1/31/97 1/31/97 <br /> Instrument I D #- GCHP07 GCHP07 GCHP07 GCHP07 <br /> Cone Spiked 0 20 mg/Kg 0 20 mg/Kg 0 20 mg/Kg 0 60 mg/K9 <br /> LCS Result. 018 018 019 0 56 <br /> LCS %Recov.. 90 90 95 93 <br /> 60-140 60-140 60-140 60-140 <br /> LCS 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 /> 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 /> 70eregory <br /> Project Manager **MS=Matrix Spike, MSD=MS Duplicate,RPD=Relative%Difference 9701G29 EEE <1> <br />