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SEQUOIA ANALYTICAL <br /> 680 Chesapeake Drive • Redwood City, CA 94063 <br /> (415) 364-9600 FAX(415) 364-9233 <br /> Blaine Tech Services, Inc Client Project ID Shell, 7910 Lower Sac Rd, Stockton <br /> 985 Timothy Drive Matrix Water <br /> San Jose, CA 95133 <br /> Attention Jim Keller OC Sample Group 3HD9801-06 Reported Sep 7, 1993 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Ethyl- <br /> Benzene Toluene Benzene Xylenes <br /> Method EPA 8020 EPA 8020 EPA 8020 EPA 8020 <br /> Analyst J Fontcha J Fontcha J Fontcha J Fontcha <br /> Conc Spiked 20 20 20 60 <br /> Units pg/L pg/L p9/L pg/L <br /> LCS Batch# LCS090193 LCS090193 LCS090193 LCS090193 <br /> Date Prepared 9/1/93 9/1/93 9/1/93 9/1/93 <br /> Date Analyzed 9/1/93 9/1/93 9/1/93 9/1/93 <br /> 6trument I D.# GCHP 5 GCHP-5 GCHP 5 GCHP-5 <br /> LCS % <br /> Recovery 111 104 97 96 <br /> Control Limits 70-130 70-130 70-130 70-130 <br /> MS/MSD <br /> Batch # 3081287 3081287 3081287 3081287 <br /> Date Prepared 9/1/93 9/1/93 9/1/93 9/1/93 <br /> Date Analyzed 9/1/93 9/1/93 9/1/93 9/1/93 <br /> Instrument I D #, GCHP 5 GCHP 5 GCHP-5 GCHP 5 <br /> Matrix Spike <br /> % Recovery 115 110 105 102 <br /> Matrix Spike <br /> Duplicate% <br /> Recovery 115 110 105 102 <br /> Relative% <br /> Difference 00 00 00 00 <br /> SEQOIA ANALYGAL Please Note <br /> 0 / The LCS is a control sample of known interferent free matrix that is analyzed using the same reagents, <br /> preparation and analytical methods employed for the samples The LCS%recovery data is used for <br /> x' validation of sample batch results Due to matrix effects,the QC limits for MS/MSDs are advisory only <br /> and are not used to accept or reject batch results <br /> krggy P n I <br /> Projec Ma ge 3HD9801 BLA <2> <br />