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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 Sheil, 141 N EI Dorado <br /> 985 Timothy Drive Matrix Water <br /> San Jose, CA 95133 <br /> Attention Jim Keller QC Sample Group 3EC3301-09 Reported Jun 4, 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: M Nipp M Nipp M Nipp M Nipp <br /> Conc. Spiked: 10 10 10 30 <br /> Units: ug/L lis/L pg/L u9/L <br /> LCS Batch#' BLK060193 BLK060193 BLK060193 BLK060193 <br /> Date Prepared N/A N/A N/A N/A <br /> Date Analyzed 6/1/93 6/1/93 6/1/93 6/1/93 <br /> Instrument I D # GCHP-2 GCHP-2 GCHP-2 GCHP-2 <br /> LCS % <br /> Recovery: 82 79 82 80 <br /> Control Limlts: 80-120 80-120 86-120 80-120 <br /> MS/MSD <br /> Batch # 3EB7602 3EB7602 3EB7602 3EB7602 <br /> Date Prepared N/A N/A N/A N/A <br /> Date Analyzed. 6/1/93 6/1/93 6/1/93 6/1/93 <br /> Instrument I D # GCHP-2 GCHP-2 GCHP-2 GCHP 2 <br /> Matrix Spike <br /> % Recovery: 93 83 93 93 <br /> Matrix Spike <br /> Duplicate% <br /> Recovery: 95 85 94 90 <br /> Relative% <br /> Difference: 21 24 11 33 <br /> SEGI A-ANALYTI1-All Please Note <br /> The LCS is a control sample of known,interferent free matrix that is analyzed using the same reagents <br /> / l / preparation and anaiytical methods employed for the samples The LCS%recoverydata is used for <br /> I/ validation of sample batch results Due to matrix effects,the OC limits for MS/MSG's are advisory only <br /> 1_ and are not used to accept or reject batch results <br /> I <br /> ProjE9(�inager 3EC3301 SLA <3> <br /> f 79 <br />