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SEQUOIA ANAWTICAL <br /> 1900 Bates Avenue • Suite LM • Concord, California 94520 <br /> f (510) 686-9600 FAX (510) 686-9689 <br /> r <br /> jftaprealian Engineering, Inc C1 lent Project 1D Unocal #2859, 1665 Pacific Ave, Stockton <br /> 01 Stanwell Dr, Ste 400 Matrix Liquid <br /> Concord, CA 94520 <br /> Attention Avo Avedessian QC Sample Group 3111352-58 Reported Dec 3, 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 J Dinsay J Dinsay J Dinsay J Dinsay <br /> MS/MSD <br /> Batch# GBLK112493 GBLK112493 GBLK112493 GBLK112493 <br /> Date Prepared 11/24/93 11/24/93 11/24/93 11/24/93 <br /> Date Analyzed 11/24/93 11/24/93 11/24/93 11/24/93 <br /> Instrument I D # ML#2 ML#2 ML#2 ML#2 <br /> Conc Spiked 20Ng/1- 20pg/L 20pg/L 60yg/L <br /> Matrix Spike <br /> % Recovery 117 110 115 114 <br /> Matrix Spike <br /> Duplicate % <br /> Recovery 106 102 109 110 <br /> Relative % <br /> Difference 98 75 54 36 <br /> LCS Batch# GBLK112493 GBLK112493 GBLK112493 GBLK112493 <br /> Date Prepared 11/24/93 11/24/93 11/24/93 11/24/93 <br /> Date Analyzed 11/24/93 11/24/93 11/24/93 11/24/93 <br /> Instrument I D # ML#2 ML#2 ML#2 ML#2 <br /> LCS % <br /> Recovery 106 100 106 106 <br /> Recovery <br /> Control Limits 55-145 47-149 47-155 56140 <br /> Please Note <br /> The LCS is a control sample of known, interferent free matrix that is analyzed using the same reagents, <br /> SEQUOIA 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 limits due to matrix <br /> interference,the LCS recoveryis to be used to validate the batch <br /> A Kern <br /> Project Manager <br /> 3111352 KEI <3> <br />