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Sequoia 680 Chesapeake Drive Redwood City CA 94063 (415) 364%()0 FAX(415) 364 9233 <br /> 1900 Bates Avenue Suite L Concord CA 94520 (510) 686 9600 FAX(51o)686 9689 <br /> Analytical 819 Stnker Avenue Suite 8 Sacramento CA 95834 (916) 921 9600 FAX(916)921 6100 <br /> SlaIneTech Services, Inc Client Project ID 940510-A2, Shell, 141 N EI Dorado <br /> 985 Timothy Drive Matrix Liquid <br /> San Jose, CA 95133 <br /> Attention Jim Keller QC Sample Group 4E73901 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 Mirattab A Mifattab <br /> MS/MSD <br /> Batch# 4E69102 4E69102 4E69102 4E69102 <br /> Date Prepared. - - - <br /> Date Analyzed. 5/14/94 5/14/94 5/14/94 5/14/94 <br /> Instrument I D # GCHP-2 GCHP-2 GCHP-2 GCHP-2 <br /> Conc Spiked 10pg/L long/L 10ug/L 30 fug/L <br /> Matrix Spike <br /> % Recovery 89 91 88 87 <br /> Matrix Spike <br /> Duplicate% <br /> Recovery 92 93 90 90 <br /> Relative % <br /> Difference 33 22 22 3 4 <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 /> ISEOUOIA ANALYTICAL preparation and analytical methods employed for the samples The matnx 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 limits due to matrix <br /> interference the LCS recovery is to be used to validate the batch <br /> Suzanne Chin <br /> Project Manager 4E73901 BLA <3> <br />