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(A116 <br /> SEQUOIA ANALYTICAL <br /> J%Pl 680 Chesapeake Drive • Redwood City, CA 94063 <br /> VQF (415) 364-9600 FAX (415) 364-9233 <br /> Blaine Tech Services, Inc Client Project ID Shell, 4445 Pershing Ave <br /> 9a5 Timothy Drive Matrix Water <br /> San Jose, CA 95133 <br /> Attention Jim Keller OC Sample Group 3J12401-06 Reported Oct 11, 1993 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Ethyi- <br /> Benzene Toluene Benzene Xylenes <br /> Method CPA 8020 EPA 8020 EPA 8020 EPA 8020 <br /> Analyst E Cunanan E Cunanan E Cunanan E Cunanan <br /> Conc. Spiked 10 10 10 30 <br /> Units ug/L us/L ug/L ug/L <br /> LCS Batch# BLK100593 BLK100593 BLK100593 BLK100593 <br /> Date Prepared <br /> Date Analyzed 10/5/93 10/5/93 10/5/93 10/5/93 <br /> Instrument I D # GCHP 18 GCHP-18 GCHP 18 GCHP-18 <br /> Is LCS % <br /> Recovery 92 92 92 93 <br /> Control Limits 80-120 80-120 &0-120 80-120 <br /> MS/MSD <br /> Batch # 3J08402 3JO8402 3JO8402 3JO8402 <br /> Date Prepared - - - <br /> Date Analyzed 10/5/93 10/5/93 10/5/93 10/5/93 <br /> Instrument I D # GCHP-18 GCHP-18 GCHP-18 GCHP-18 <br /> Matrix Spike <br /> % Recovery 90 89 89 1DD <br /> Matrix Spike <br /> Duplicate% <br /> Recovery 94 93 94 107 <br /> Relative% <br /> Difference 43 43 5 5 68 <br /> SEAl301A ANALYTICAL Please Note <br /> The LCS is a control sample of known interferent free matrix that is analyzed using the same reagents <br /> preparation and anal vtical methods employed for the sampies The LCS%recovery data is used for <br /> 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 resect batch results <br /> P'e'99Yi�*FkeT <br /> ProjeaW)3'11�acler 3J12401 BLA <2> <br />