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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 OC 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 10 10 10 30 <br /> Units ugIL u9/L u9/L 99/1- <br /> LCS <br /> 9/LLCS Batch# BLK060893 BLK060893 BLK060893 BLK060893 <br /> Date Prepared: N/A N/A N/A N/A <br /> Date Analyzed: 6/8/93 6/8/93 6/8/93 6/8/93 <br /> Instrument I D #' GCHP 2 GCHP-2 GCHP-2 GCHP-2 <br /> 40 LCS % <br /> Recovery a3 83 a3 83 <br /> Control Limits 80-120 80-120 80-120 80-120 <br /> MS/MSD <br /> Batch #. 3F13211 3F13211 3F13211 3F13211 <br /> Date Prepared. N/A N/A N/A N/A <br /> Date Analyzed 6/8/93 6/8/93 6/8/93 6/8/93 <br /> Instrument I.D.#: GCHP 2 GCHP-2 GCHP-2 GCHP 2 <br /> Matrix Spike <br /> %Recovery a3 a4 84 83 <br /> Matrix Spike <br /> Duplicate% <br /> Recovery- 98 99 99 100 <br /> Relative % <br /> Difference- 17 16 16 19 <br /> SEQUOIA 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%recovery data is used for <br /> - validation of sample batch results Due to matrix effects the CC limits for MS/MSD's are advisory only <br /> Land are not used to accept or reject batch results <br /> Mari 4e I -/ <br /> Project Manager 31713201 BLA <4> <br /> - 1 <br />