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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, 620 Charter Way <br /> 985 Timothy Drive Matrix Water <br /> San Jose, CA 95133 <br /> Attention Jim Keller QC Sample Group 3F13201-12 Reported Jun 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: M Nipp M Nipp M Nipp M Nipp <br /> Conc. Spiked. a 10 10 30 <br /> Units- ug/L Ng/L rig/L Yg/L <br /> LCS Batch#` BLK060793 BLK060793 BLK060793 BLK060M <br /> Date Prepared N/A N/A N/A N/A <br /> Date Analyzed 6/7/93 6/7/93 6/7/93 6/7/93 <br /> Instrument LD # GCHP-3 GCHP-3 GCHP-3 GCHP-3 <br /> LCS % <br /> Recovery. 91 91 91 90 <br /> Control Limits 80-120 80-120 80-120 80-120 <br /> MS/MSD <br /> Batch# 3F15604 3F15604 3F15604 3F15604 <br /> Date Prepared. N/A N/A N/A N/A <br /> Date Analyzed• 6/7/93 6/7/93 6/7;93 6/7/93 <br /> Instrument i D # GCHP 3 GCHP-3 GCHP-3 GCHP-3 <br /> Matrix Spike <br /> iib Recoverv: 94 92 95 93 <br /> Matrix Spike <br /> Duplicate% <br /> Recovery 100 100 100 100 <br /> Relative% <br /> Difference. 62 83 51 73 <br /> SEQUCM ANALYTICAL Please Note <br /> The LCS is a control sample of known,interferent free matrix that is analyzed using the same reagents, <br /> f )/ preparation and analytical methods employed for the samples The LCS%recovery data is used for <br /> validation of sample batch results Due to matrix effects,the CC limits for MS/MSDs are advisory only <br /> *Vnger <br /> and are not used to accept or reject batch results <br /> Project 3F13201 BLA <3> <br />