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Sequoia 680 Chesapeake Dnve Redwood City,CA 94063 (650) 364-9600 FAX(650)364 9233 <br /> ID 404 N Wiget Lane Walnut Creek,CA 94598 (510) 988-9600 FAX(510)988 9673 <br /> Analytical 819 Sinker Avenue,Suite 8 Sacramento,CA 95834 (916) 921 9600 FAX(916)921 0100 <br /> BlainerTech Services, Inc Client Project ID Shell Stockton /971202-L1 <br /> A 1680 Rogers Ave Matrix Liquid <br /> San Jose, CA 95112 <br /> Attention Fran Thie Work Order# 9712358-07 Reported Dec 31, 1997 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte: Benzene Toluene Ethyl Xylenes Gas <br /> Benzene <br /> QC Batch#: GC121697BTEX21A GC121697BTEX21A GC121697BTEX21A GC121697BTEX21A GC121697BTEX21A <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. Miraftab A Miraftab A.Miraftab A.Miraftab A Miraftab <br /> MS/MSD #• 971277503 971277503 971277503 971277503 971277503 <br /> Sample Conc. N D N D N D N D N D <br /> Prepared Date 12/16/97 12/16/97 12/16/97 12/16/97 12/16/97 <br /> Analyzed Date. 12/16/97 12/16/97 12/16/97 12/16/97 12/16/97 <br /> Instrument I D #- GCHP21 GCHP21 GCHP21 GCHP21 GCHP21 <br /> Conc. Spiked 10 Pg/L 10 pg/L 10pg/L 30Ng/L 60 erg/L <br /> Result 10 11 11 32 61 <br /> MS %Recovery 100 110 110 107 102 <br /> Dup. Result 10 11 11 32 61 <br /> MSD % Recov.- 100 110 110 107 102 <br /> RPD- 00 00 00 00 00 <br /> RPD Limit: 0-25 0-25 0-25 0-25 0-25 <br /> LCS #- BLK121697 ELK121697 BLK121697 BLK121697 BLK121697 <br /> Prepared Date 12/16/97 12/16/97 12/16/97 12/16/97 12/16/97 <br /> Analyzed Date 12/16/97 12/16/97 12/16/97 12/16/97 12/16/97 <br /> Instrument LD #- GCHP21 GCHP21 GCHP21 GCHP21 GCHP21 <br /> Conc Spiked- 10 yg/L 10 pg/L 10pg/L 30 ug/L 60 Ng/L <br /> LCS Result 10 11 11 32 66 <br /> LCS % Recov 100 110 110 107 110 <br /> 60-140 60-140 60-140 60-140 60-140 <br /> LCS 70-130 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 /> 0 SEG O 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 /> Peg r <br /> Prole onager **MS=Matrix Spike, MSD=MS Duplicate,RPD=Relative%Difference 9712358 SLA a3> <br />