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SEQUOIA ANALYTICAL <br /> 680 Chesapeake D Redwood y, CA <br /> (415) 364-9600 FAX (415) 364-9233 <br /> Blaine Tech Services, Inc Client Project ID Shell 620 W Charter Way, Stockton <br /> 985 Timothy Drive Matrix Water <br /> San,lose, CA 95133 <br /> Attention Jim Keller OC Sample Group 3HE7804 Reported Sep 9, 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. R Geckier M Nipp M Nipp M Nipp <br /> Conc Spiked 020 020 020 060 <br /> Units mg/kg mg/kg mg/kg mg/kg <br /> LCS Batch# BLKOW393 BLK090393 BLK090393 BLK090393 <br /> Date Prepared 9/3/93 9/3/93 9/3/93 9/3/93 <br /> Date Analyzed 9/3/93 9/3/93 9/3/93 9/3/93 <br /> Instrument I D # GCHP-18 GCHP 18 GCHP 18 GCHP-18 <br /> . LCS % <br /> Recovery- 100 100 100 100 <br /> Control Limits 60-140 60-140 60-140 60-140 <br /> MS/MSD <br /> Batch # 3HO8805 3HO8805 3HO8805 3HO8805 <br /> Date Prepared 9/3/93 9/3/93 9/3/93 9/3/93 <br /> Date Analyzed. 9/3/93 9/3/93 9/3/93 9/3/93 <br /> Instrument I D #• GCHP 18 GCHP-18 GCHP 18 GCHP-18 <br /> Matrix Spike <br /> N. Recovery 95 100 95 97 <br /> Matnx Spike <br /> Duplicate % <br /> Recovery 100 105 100 102 <br /> Relative % <br /> Difference 51 49 51 so <br /> SEQUOIA ANALYTICAL Please Note <br /> 0-0��/ / The LCS is a control sample of known interferent free matrix that is analyzed using the same reagents <br /> I f preparation and analytical methods employed for the samples The LCS%recovery data is used for <br /> I, validation of sample batch results Due to matrix effects the CC limas for MS/MSDs are advisory only <br /> and are not used to accept or(elect batch results <br /> ✓P9YA P r <br /> Projelet nager 3HE7801 BLA <6> <br /> � I� <br />