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•r <br /> 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 W Charter Way, Stockton <br /> 985 Timothy Drive Matrix Water <br /> San Jose, CA 95133 <br /> Attention Jim Keller QC Sample Group 3HE7801-13 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 M Nipp M Nipp M Nipp M Nipp <br /> Conc Spiked 10 10 10 30 <br /> Units- )1g/L ug/L !J9/L u9/L <br /> LCS Batch# BLK090493 BLK090493 BLK090493 BLK090493 <br /> Date Prepared <br /> Date Analyzed 9/4/93 9/4/93 9/4/93 9/4/93 <br /> Instrument I D # GCHP 2 GCHP-2 GCHP 2 GCHP-2 <br /> LCS % <br /> Recovery 110 110 110 110 <br /> Control Limits 80-120 80-120 80.120 80-120 <br /> MS/MSD <br /> Batch # 3HE7803 3HE7803 3HE7803 3HE7803 <br /> Date Prepared - <br /> Date Analyzed 9/4/93 9/4/93 9/4/93 9/4/93 <br /> Instrument I D.# GCHP 2 GCHP 2 GCHP-2 GCHP-2 <br /> Matrix Spike <br /> Recovery 110 110 110 110 <br /> Matrix Spike <br /> Duplicate% <br /> Recovery- 110 110 110 110 <br /> Relative % <br /> Difference 00 00 00 00 <br /> SEQUOIA ANALY�CAL Please Nate <br /> 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 far <br /> validation of sample batch results Due to matrix effects the CC limits for MS/MSD s are advisory only <br /> and are not used to accept or reject batch results <br /> e y nner <br /> Project eager 3HE780113LA <5> <br />