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Sequoia 680 Chesapeake Dnve Redwood City,CA 94063 (650) 364 9600 FAX(650)364-9233 <br /> 404 N Wiget lane Walnut Creek,CA 94598 (510) 988-9600 FAX(510)988 %73 <br /> IeD Analytical 819 Stnker Avenue,Suite 8 Sacramento,CA 95834 (916) 921 9600 FAX(916)921 0100 <br /> Blaine Tech Services, Inc Client Project ID Shell Stockton /971222-F1 <br /> 1680 Rogers Ave Matrix Liquid <br /> San Jose, CA 95112 <br /> 'Attention Fran Thie Work Order# 9712F01-01-08 Reported Jan 12, 1998 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte Benzene Toluene Ethyl Xylenes Gas <br /> Benzene <br /> QC Batch# GCO10598802002A GC010598802002A GC010598802002A GCO10598802002-A GCO10598802002A <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 K Nill K Nill K Nill K Nill K Nill <br /> MS/MSD# 7121890 7121890 7121890 7121890 7121890 <br /> Sample Conc . N D N D N D N D N D <br /> Prepared Date: 1/5/98 1/5/98 1/5/98 1/5/98 1/5/98 <br /> Analyzed Date 1/5/98 1/5/98 1/5/98 1/5/98 1/5/98 <br /> Instrument I D # HP2 HP2 HP2 HP2 HP2 <br /> Conc Spliced 20pg/L 2opg/L 20pg/L 60pg/L 310pg/L <br /> Result 20 21 22 65 310 <br /> MS % Recovery 100 105 110 108 100 <br /> Dup. Result- 20 21 23 66 300 <br /> MSD % Recov. 100 105 115 110 97 <br /> RPD. 00 0o 44 15 33 <br /> RPD Limit. 0-20 0-20 0-20 0-20 0-50 <br /> LCS #- LCS010598 LCS010598 LCS010598 LCS010598 LCS010598 <br /> Prepared Date 1/5/98 1/5/98 1/5/98 1/5/98 1/5/98 <br /> Analyzed Date 1/5/98 1/5/98 1/5/98 1/5/98 1/5/98 <br /> Instrument I D # HP2 HP2 HP2 HP2 HP2 <br /> Conc. Spiked 20pg/L 20pg/L 2opg/L 60pg/L 310pg/L <br /> LCS Result 18 20 21 63 300 <br /> LCS % Recov 90 100 105 105 97 <br /> 60-140 60-140 60-140 60-140 60140 <br /> LCS 70-130 70-130 70-130 70-130 70-130 <br /> Control Limits <br /> Please Note <br /> Mjecanager <br /> ALYTICAL The LCS is a control sample of known,interferent-free matrix that is analyzed using the same reagents, <br /> V <br /> 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 9 <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 /> **MS=Matrix Spike,MSD=MS Duplicate, RPD=Relative% Difference 9712F01 BLA <6> <br />