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i <br /> ` Sequoia 680 Chesapeake Drive Redwood City CA 94063 (415) 364 9600 FAX(415) 364 9233 <br /> 404 N Wiget Lane Walnut Creek CA 94598 (510) 988 9600 FAX(510)988 9673 <br /> Analytical 819 Striker Avenue Suite a Sacramento CA 95834 (916) 921 9600 FAX(916)921 0100 <br /> Touchstone Developments Client Project ID Chevron 9-8264 /9-8264 <br /> 17170 Keaton Ave Matrix Solid <br /> Sonoma, CA 95476 <br /> Attention Tim Walker Work Order# 9602708 01, 02, 04, 07, 09 Reported Feb 23, 1996 <br /> 11, 12, 15, 16 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte Benzene Toluene Ethyl Xylenes <br /> Benzene <br /> QC Batch# GCO21396BTEXEXB GCO21396BTEXEXB GCO21396BTEXEXB GCO21396BTEXEXB <br /> Analy Method EPA 8020 EPA 8020 EPA 8020 EPA 8020 <br /> Prep Method EPA 5030 EPA 5030 EPA 5030 EPA 5030 <br /> Analyst E Cunanan E Cunanan E Cunanan E Cunanan <br /> MS/MSD # 960245706 960245706 960245706 960245706 <br /> Sample Conc N D N D N D N D <br /> Prepared Date 2/13/96 2/13/96 2/13/96 2/13/96 <br /> Analyzed Date 2/14/96 2/14/96 2/14/96 2/14/96 <br /> Instrument I D # GCHP1 GCHP1 GCHP1 GCHP1 <br /> Conc Spiked 0 20 mg/Kg 0 20 mg/Kg 0 20 mg/Kg 0 60 mg/Kg <br /> Result 016 017 017 052 <br /> S % Recovery 80 85 85 87 <br /> Dup Result 016 017 017 052 <br /> MSD % Recov 80 85 85 87 <br /> RPD 00 00 00 00 <br /> RPD Limit 0-50 0-50 0-50 0-50 <br /> LCB # BLK021396 BLK021396 BLK021396 BLK021396 <br /> Prepared Date 2/13/96 2/13/96 2/13/96 2/13/96 <br /> Analyzed Date 2/14/96 2/14/96 2/14/96 2/14/96 <br /> Instrument I D # GCHP1 GCHP1 GCHP1 GCHP1 <br /> Conc Spiked 0 20 mg/Kg 0 20 mg/Kg 0 20 mg/Kg 0 60 mg/Kg <br /> LCS Result 018 019 019 056 <br /> LCS % Recov 90 95 96 93 <br /> LCS <br /> Control Limits 50-150 50-150 50-150 50-150 <br /> Please Note <br /> The LCS is a control sample of known,interferent-free matrix that is analyzed using the same reagents, <br />�EQUOIA 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 /> r 5� Interference,the LCS recovery is to be used to validate the batch <br /> Kevin Follett <br /> Project Manager **MS=Matrix Spike, MSD=MS Duplicate,RPD=Relative% Difference 9602708 TTT c3> <br />