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Sequoia 680 Chesapeake Drive Redwood Clty,CA 94063 (650) 364-9600 FAX(650)364 9233 <br /> Ci) 404N Wiget Lane Walnut Creek,CA 94598 (510) 988 9600 FAX(5 10)988 %73 <br /> 1wr Analytical 819 Striker Avenue,Suite 8 Sacramento,CA 95834 (916) 921 9600 FAX(916)921 0100 <br /> Blaine Tech Services, Inc Client Project ID Shell Stockton/971202-L1 <br /> 1680 Rogers Ave Matrix Liquid <br /> San Jose, CA 95112 ; <br /> Attention Fran Thie Work Order# 9712360-12-14 Reported Dec 31, 1997, <br /> QUALITY CONTROL DATA REPORT <br /> Analyte Benzene Toluene Ethyl Xylenes Gas <br /> Benzene <br /> QC Batch#. GC121297STEX21A GC121297BTEX21A GC121297BTEX21A GC121297BTEX21A GC121297BTEX21A <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 # 971214305 971214305 971214305 971214305 971214305 <br /> Sample Conc N D N D N D N D N D <br /> Prepared Date 12/12/97 12/12/97 12/12/97 12/12/97 12/12/97 <br /> Analyzed Date 12/12/97 12/12/97 12/12/97 12/12/97 12/12/97 <br /> Instrument I.D.# GCHP21 GCHP21 GCHP21 GCHP21 GCHP21 <br /> Conc. Spiked. 10Ng/L 10pg/L 10ug/L 30Ng/L 60lig/L <br /> Result. 98 10 10 30 58 <br /> MS % Recovery 98 100 100 100 97 <br /> Dup Result 90 93 97 2B 54 <br /> MSD % Recov 90 93 97 93 90 <br /> RPD 85 73 30 69 71 <br /> RPD-Limit 0-25 0.25 0-25 _ _-- ..0-25_ —_.- 0-25 -- <br /> LCS # BLK121297 BLK121297 BLK121297 BLK121297 BLK121297 <br /> Prepared Date: 12/12/97 12/12/97 12/12/97 12/12/97 12/12/97 <br /> Analyzed Date: 12/12/97 12/12/97 12/12/97 12/12/97 12/12/97 <br /> Instrument LD #. GCHP21 GCHP21 GCHP21 GCHP21 GCHP21 <br /> Conc. Spiked- 10pg/L 10ug/L 10ug/L 30pg/L 60lig/L <br /> LCS Result 77 83 89 25 48 <br /> LCS % Recov 77 83 89 83 80 <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 /> 7ggAN LYTICAL preparation,and analytical methods employed for the samples The matrix spike is an aliquot of samp <br /> fortified with known quantities of specific compounds and subjected to the entire analytical procedure <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 /> e erManager *'MS=Matrix Spike, MSD=MS Duplicate, RPD=Relative% Difference 9712358 BLA <e> <br />