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u Sequoia 680 Chesapeake Drive 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 9673 <br /> Analytical 819 Sinker Avenue,Suite 8 Sacramento,CA 95834 (916) 92t 9600 FAX(916)921 0100 <br /> Blaine Tech Services, Inc Client Project ID Shell Stockton /980210-A2 <br /> 1680 Rogers Ave Matrix Liquid <br /> San Jose, CA 95112 <br /> Attention Fran Thie Work Order# 9802738-05 Reported Feb 27, 1998 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte Benzene Toluene Ethyl Xylenes Gas <br /> Benzene <br /> QC Batch#: GCO22198802002A GCO22198802002A GCO2-2198802002A GCO22198802002A GCO22198802002A <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 Ndi <br /> MS/MSD # 8020866 8020866 8020866 8020866 8020866 <br /> Sample Conc N D N D N D N D N D <br /> Prepared Date 2/21/98 2/21/98 2/21/98 2/21/98 2/21/98 <br /> Analyzed Date. 2/21/98 2/21/98 2/21/98 2/21/98 2/21/98 <br /> Instrument I D #- HP2 HP2 HP2 HP2 HP2 <br /> Conc. Spiked 20pg/L 20pg/L 20pg/L 60pg/L 300 lig/L <br /> Result: 20 20 20 63 350 <br /> MS % Recovery 100 100 100 105 117 <br /> Dup Result- 20 20 20 64 350 <br /> MSD % Recov 100 100 100 107 117 <br /> RPD 00 00 00 16 00 <br /> RPD Limit 0-20 0-20 0-20 0-20 0-50 <br /> LCS # LCS022198 LC5022198 LCS022198 LCS022198 LCS022198 <br /> Prepared Date 2/21/98 2/21/98 2/21/98 2/21/98 2/21/98 <br /> Analyzed Date- 2/21/98 2/21/98 2/21/98 2/21/98 2/21/98 <br /> Instrument I D # HP2 HP2 HP2 HP2 HP2 <br /> Conc Spiked. 20pg/L 20pg/L 20pg/L 60pg/L 300pg/L <br /> LCS Result 20 20 20 63 340 <br /> LCS % Recov 100 100 100 105 113 <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 /> SEQ IA A LYTICAL The LCS is a control sample of known,interferent-free matrix that 1s analyzed using the same reagents, <br /> # 27 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 fail within specified control limits due to matrix <br /> interference,the LCS recovery is to be used to validate the batch <br /> Pggy enner <br /> Pr t Manager **MS=Matrix Spike,MSD=MS Duplicate, RPD=Relative% Difference 9802738 BLA <2> <br /> 4 <br />