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4D <br /> Sequoia 680 Chesapeake Drive Redwood City CA 94063 (415) 364 9600 FAX (415) 364 9233 <br /> 404 N Wtget Lane Walnut Creek CA 94598 (510) 988 9600 FAX(510) 988 9673 <br /> Analytical 819 Striker Avenue Suite 8 Sacramento,CA 95834 (916) 921 9600 FAX(916) 921 0100 <br /> Touchstone Developments Client Project ID Chevron 9-2033, 2033-2 <br /> P O Box 2554 Matrix Solid <br /> Santa Rosa, CA 95405 <br /> Attention Jeff Monroe Work Order# 9610612 01-04 Reported Oct 15, 1996 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte Benzene Toluene Ethyl Xytenes <br /> Benzene <br /> QC Batch# GC11196BTEXEXA GC11196BTEXEXA GC11196BTEXEXA GC11196BTEXEXA <br /> Analy Method EPA 8020 EPA 8020 EPA 8020 EPA 8020 <br /> Prep Method EPA 5030 EPA 5030 EPA 5030 EPA 5030 <br /> Analyst. Porter Porter Porter Porter <br /> M S/MSD # 961056806 961056806 961056806 961056806 <br /> Sample Cone N D N D N D N D <br /> Prepared Date 10/11/96 10/11/96 10/11/96 10/11/96 <br /> Analyzed Date 10/11/96 10/11/96 10/11/96 10/11/96 <br /> Instrument I D # GCHP22 GCHP22 GCHP22 GCHP22 <br /> Cone Spiked- 0 20 mg/Kg 0 20 mg/Kg 0 20 mg/Kg 0 60 mg/Kg <br /> Result 019 017 016 050 <br /> 40S % Recovery 95 85 80 83 <br /> Dup Result 019 017 016 049 <br /> MSD % Recov 95 85 80 82 <br /> RPD 00 00 00 20 <br /> RPD Limit. 0-25 0-25 0-25 0-25 <br /> LCS # BLK101196 BLK101196 BLK101196 BLK101196 <br /> Prepared Date 10/11/96 10/11/96 10/11/96 10/11/96 <br /> Analyzed Date- 10/11/96 10/11/96 10/11/96 10/11/96 <br /> Instrument I D # GCHP22 GCHP22 GCHP22 GCHP22 <br /> Cone Spiked 0 20 mg/Kg 0 20 mg/Kg 0 20 mg/Kg 0 60 mg/Kg <br /> LCS Result 021 019 018 056 <br /> LCS % Recov 105 95 90 93 <br /> 60-140 60-140 60-140 60-140 <br /> LCS 70-130 70-130 70-130 70-130 <br /> Control Limits <br /> Please Note <br /> The LCS Is a control sample of known, Interferent-free matrix that Is analyzed using the same reagents, <br /> QU A 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 recovery Is to be used to validate the batch <br /> vin Follett <br /> Project Manager **MS=MatrlxSpike, MSD=MS Duplicate,RPD=Relative%Difference 9610612TTT <1a <br /> r� <br />