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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 W Charter W <br /> . 1 Y <br /> 985 Timothy Drive Matrix Water <br /> San Jose, CA 95133 <br /> Attention Jim Keller CC Sample Group 3KE3801-12 Reported Dec 9, 1993 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Benzene Toluene Ethyl Xylenes <br /> Benzene <br /> Method: EPA 8020 EPA 8020 EPA 8020 EPA 8020 <br /> Analyst: M L M L M L M L <br /> MS/MSD <br /> Batch# 3120015 3120015 3120015 3120015 <br /> Date Prepared: 12/1/93 12/1/93 12/1/93 12/1/93 <br /> Date Analyzed: 12/1/93- 12/1/93 12/1/93 12/1/93 - <br /> Instrument I D.#: GCHP-2 GCHP-2 GCHP-2 GCHP-2 <br /> Conc. Spiked: 10 mg/L 10 mg/L 10 mg/L 30 mg/L <br /> Matrix Spike <br /> %Recovery- 98 99 97 97 <br /> Matrix Spike <br /> Duplicate% <br /> Recovery- 100 110 100 107 <br /> Relative% <br /> Difference 20 11 30 98 <br /> LCS Batch# LCS 120193 LCS120193 LCS 120193 LCS120193 <br /> Date Prepared 12/1/93 12/1/93 12/1/93 12/1/93 <br /> Date Analyzed: 12/1/93 12/1/93 12/1/93 12/1/93 <br /> Instrument I D.#- GCHP-2 GCHP-2 GCHP 2 GCHP-2 <br /> LCS % <br /> Recovery 103 109 105 105 <br /> % Recovery <br /> Control Limtts• 60-120 80-120 80-120 80-120 <br /> Please Note <br /> The LCS is a control sample of Known,interferent free matrix that is analyzed using the same reagents, <br /> SEQUiOIA ANALYTICAL preparation and analytical methods employed for the samples The matrix spike is an aliquot of sample <br /> fortified with known quantities of specific compounds and subjected to the entire analytical procedure If <br /> + the recovery of anaiytes from the matrix spike does not fall within specified control limits due to matrix <br /> interference the LCS recovery is to be used to validate the batch <br /> ecAy A Penner <br /> Project Manager 3KE3801 BLA <37 <br />