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Sequoia 680 Chesapeake Drive Redwood City CA 94063 (650) 364 9600 FAX(650)364-9233 <br /> 41) 404 N Wiget Lane Walnut Creek CA 94598 (510) 988 9600 FAX(510) 988 9673 <br /> �ill7 Analytical 819 Striker Avenue,Suite 8 Sacramento,CA 95834 (916) 921-9600 FAX(916)921 0100 <br /> Cambria Environmental Client Project ID Shell 2575 Country Club Blvd <br /> 270 Perkins Avenue Matrix Solid <br /> Sonoma, CA 95476 <br /> Attention Joe Neely Work Order# 9711136 -01-04 Reported Nov 11, 1997 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte Benzene Toluene Ethyl Xylenes Gas <br /> Benzene <br /> QC Batch# GC110797BTEXEXB GC110797BTD<EXS GC1107976TEXEXB GC110797BTEXEXB GC110797BTEXEXB <br /> Analy Method EPA 8020 EPA 8020 EPA 8020 EPA 8020 EPA 8015M <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 # 971120609 971120609 971120609 971120609 971120609 <br /> Sample Cone N D N D N D N D N D <br /> Prepared Date 11/7/97 11/7/97 11/7/97 11/7/97 11/7/97 <br /> Analyzed Date 11/7/97 11/7/97 11/7/97 11/7/97 11/7/97 <br /> Instrument I D # GCHP7 GCHP7 GCHP7 GCHP7 GCHP7 <br /> Cone Spikes[ 0 20 mg/Kg 0 20 mg/Kg 0 20 mg/Kg 0 60 mg/Kg 1 2 mg/Kg <br /> Result 020 019 019 058 11 <br /> MS % Recovery 100 95 95 97 92 <br /> Dup Result 020 019 019 058 11 <br /> MSD % Recov 100 95 95 97 92 <br /> RPD 00 00 00 00 00 <br /> RPD Limit 0-25 025 0-25 0-25 0-25 <br /> LCS # BLK110797 BLK110797 BLK110797 BLK110797 BLK110797 <br /> Prepared Date 11/7/97 11/7/97 11/7/97 11/7/97 11/7/97 <br /> Analyzed Date 11/7/97 11/7/97 11/7/97 11/7/97 11/7/97 <br /> Instrument I.D # GCHP7 GCHP7 GCHP7 GCHP7 GCHP7 <br /> Cone Spiked 0 20 mg/Kg 0 20 mg/Kg 0 20 mg/Kg 0 60 mg/Kg 1 2 mg/Kg <br /> LCS Result 021 020 020 059 11 <br /> LCS % Recov 105 100 100 98 92 <br /> 60-140 60-140 60-140 60-140 60-140 <br /> LCS 70-130 70130 70-130 70-130 70-130 <br /> Control Limits <br /> Please Nate <br /> The LCS is a control sample of known,interferent-free matrix that is analyzed using the same reagents, <br /> VUOQLYTICAL 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 /> er ""*MS=Matrix Spike, MSD=MS Duplicate, RPD=Relative% Difference 9711136 CCC <1> <br />