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i Sequoia 680 Chesapeake Dnve Redwood City CA 94063 (415) 364 9600 FAX(415) 364 9233 1900 Bates Avenue,Suite L Concord CA 94520 (510) 686 9600 FAX(510)686 9689 Analytical 819 Striker Avenue,Suite 8 Sacramento CA 95834 (916) 921 9600 FAX(916)921 0100 Mill Creek Associates Client Project ID Roek Bros Property S= P O Box 130 Matrix Soffd �z Milford, CA 96121 Attention Russell Juncal QC Sample Group 9409A73 -01-8 Reported Sep 30, 1994 QUALITY CONTROL DATA REPORT ANALYTE Diesel Benzene Toluene Ethyl Xylenes Benzene Method EPA 8015 EPA 8020 EPA 8020 EPA 8020 EPA 8020 Analyst N Herrera R Geckler R Geckler R Geckler R Geckler MS/MSD Batch# 9409A7301 940991505 940991505 940991505 940991505 Date prepared 9/26/94 9/21/94 9/21/94 9/21/94 9/21/94 Date Analyzed 9/26/94 9/21/94 9/21/94 9/21/94 9/21/94 Instrument I D #• GCHP 5 GCHP 1 GCHP 1 GCHP t GCHP-1 Conc Spiked 15 mg/Kg 0 20 mg/Kg 0 20 mg/Kg 0 20 mg/Kg 0 60 mg/Kg Matrix Spike % Recovery 80 90 90 95 93 Matrix Spike Duplicate% Recovery 87 85 90 90 90 Relative% Difference 84 57 00 54 33 LCS Batch# Date Prepared Date Analyzed Instrument I D #, LCS % Recovery, - - % Recovery Control Limits 38 122 55 145 47 149 47 155 56 140 Please Note The LCS is a control sample of known interferent free matrix that is analyzed using the same reagents, 40SEQUOIA ANALYTICAL_ preparation,and analytical methods employed for the samples The matrix spike is an aliquot of sample fortified with known quantities of specific compounds and subjected to the entire analytical procedure If �4/1�T �� the recovery of analytes from the matrix spike does not fall within specified control limits due to matrix 1` interference,the LGS recovery is to be used to validate the batch Vickie Tague Clark Prolect Manager 9409A73 MMM <1>