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Sequoia 680 Chesapeake Drive Redwood City CA 94063 (415) 364 9600 FAX(415) 364-9233 <br /> 1900 Bates Avenue Suite L Concord CA 94520 (510) 686 9600 FAX(510)686 9689 <br /> 819 Stnker Avenue Suite 8 Sacramento CA 95834 (916) 921 9600 FAX(916)921 0100 <br /> Analytical <br /> Blaine Tech Services, Inc Client Project ID 940510-L3, Shell, 4445 Pershing Ave <br /> 985 Timothy Drive Matrix Uquid <br /> San Jose, CA 95133 <br /> Attention Jim Keller CC Sample Group 4EB7901-04 Reported May 23, 1994 <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. A. Miraftab A.Miraftab A Miraftab A Miraftab <br /> MS/MSD <br /> Batch#- 4E69103 4E69103 4E69103 4E69103 <br /> Date Prepared - - - <br /> Date Analyzed 5/14/94 5/14/94 5/14/94 5/14/94 <br /> Instrument LD #, GCHP-17 GCHP-17 GCHP-17 GCHP-17 <br /> Cone Spiked: 10Ng/L long/L 10ug/L 30pg/L <br /> Matrix Spike <br /> °,G Recovery: 120 120 120 120 <br /> Matrix Spike <br /> Duplicate % <br /> Recovery* 100 100 100 100 <br /> Relative % <br /> Difference. 18 18 18 is <br /> LCS Batch#: - - - <br /> Date Prepared: - <br /> Date Analyzed - - <br /> Instrument I D.#: - <br /> LCS % <br /> Recovery - - - - <br /> % Recovery <br /> Control Limits 71-133 72-128 72-130 71-120 <br /> Please Note <br /> The LCS is a control sample of known,interferent free matrix that is analyzed using the same reagents, <br /> 0QUOIA 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 analytes from the matrix spike does not fall within specified control limas due to matrix <br /> S interference,the LCS recovery is to be used to validate the batch <br /> Suzanne Chin <br /> Project Manager 4E67901 BLA <3> <br />