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r <br /> a <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 6020 EPA 8020 <br /> Analyst M Nipp M Nipp M Nipp M Nipp <br /> Conc. Spiked 10 10 10 30 <br /> Units u9/L uf3/L pg/L u9/L <br /> LCS Batch# BLK090393 BLK090393 BLK090393 BLK090393 <br /> Date Prepared - - <br /> Date Analyzed 9/3/93 9/3/93 9/3/93 9/3/93 <br /> Instrument l D # GCHP 2 GCHP 2 GCHP 2 GCHP 2 <br /> LCS <br /> Recovery 100 100 100 100 <br /> Control Limits 80.120 80-120 80-120 80-120 <br /> MS/MSD <br /> Batch # 3HF1107 3HF1107 3HF1107 3HF1107 <br /> Date Prepared - - - <br /> Date Analyzed 9/3/93 9/3/93 9/3/93 9/3/93 <br /> Instrument I D # GCHP 2 GCHP 2 GCHP-2 GCHP 2 <br /> Matrix Spike <br /> % Recovery 100 100 100 100 <br /> Matrix Spike <br /> Duplicate % <br /> Recovery 100 100 100 100 <br /> Relative % <br /> Difference 00 00 00 00 <br /> SEQbf0IA 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 analytical methods employed for the samples The LCS 96 recovery data is used for <br /> J 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 relect batch results <br /> 99yVPeitiiaer <br /> Project Jer 3HE7801 BLA <4> <br />