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' <br /> ID- <br /> 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 /> grilAnalytical 819 Striker Avenue,Suite 8 Sacramento, CA 95834 (916) 921 9600 FAX (916) 921-0100 <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# 9701G31 -01-04 Reported Feb 11, 1997 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte Benzene Toluene Ethyl Xylenes <br /> Benzene <br /> QC Batch# G0020397BTEXEXA GCO20397BTEXEXA GCO203976TEXEXA GCO20397BTEXEXA <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 # 9701D9101 9701D9101 970109101 9701D9101 <br /> Sample Conc N D N D N D N D <br /> Prepared Date 2/3/97 2/3/97 2/3/97 2/3/97 <br /> Analyzed Date 2/4/97 2/4/97 2/4/97 2/4/97 <br /> Instrument I D # GCHP07 GCHP07 GCHP07 GCHP07 <br /> Conc Spiked 0 20 mg/Kg 0 20 mg/Kg 0 20 mg/Kg 0 60 mg/Kg <br /> Result 019 020 021 061 <br /> MS % Recovery 95 100 105 102 <br /> Dup Result 018 019 020 060 <br /> IVISâť‘ % Recov 90 95 100 100 <br /> RPD 54 51 49 17 <br /> RPD Limit 025 025 0-25 0-25 <br /> LCS # BI-KO20397 BLK020397 BLK020397 BLK020397 <br /> Prepared Date 2/3/97 2/3/97 2/3/97 2/3/97 <br /> Analyzed Date 2/4/97 2/4/97 2/4/97 2/4/97 <br /> Instrument I.D # GCHP07 GCHP07 GCHP07 GCHP07 <br /> Conc Spiked 0 20 mg/Kg 0 20 mg/Kg 0 20 mg/Kg 0 60 mg/Kg <br /> LCS Result 017 017 018 054 <br /> LCS % Recov 85 85 90 90 <br /> M /M D 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 1s 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 /> regcry <br /> roject Manager *'MS=Matrix Spike, MSD=MS Duplicate, RPD=Relative % Difference 9701G31 EEE <1> <br />