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Sequoia 680 Chesapeake Dnve 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 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# 9611596 01-20 Reported Nov 15, 1996 <br /> QUALITY CONTROL DATA REPORT <br /> Anaiyte. Benzene Toluene Ethyl Xylenes <br /> Benzene <br /> OC Batch# GC111396BTEXEXA GC1113966TEXEXA GC111396BTEXEXA GC111396BTEXEKA <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 /> MS/MSD#• 961124802 961124802 961124802 961124802 <br /> Sample Conc - N D N D N D N D <br /> Prepared Date 11/13/96 11/13/96 11/13/96 11/13/96 <br /> Analyzed Date 11/13/96 11/13/96 11/13/96 11/13/96 <br /> Instrument I D # GCHP22 GCHP22 GCHP22 GCHP22 <br /> Conc Spiked 0 20 mg/Kg 0 20 mg/Kg 0 20 mg/Kg 0 60 mg/Kg <br /> Result 016 016 016 051 <br /> 46S % Recovery 80 80 80 85 <br /> Dup Result 015 016 016 049 <br /> MSD % Recov. 75 80 80 82 <br /> RPD' 65 00 00 40 <br /> RPD Limit 0-25 0-25 0-25 0-25 <br /> LCS. # BLK111396 BLK111396 BLK111396 BLK111396 <br /> Prepared Date 11/13/96 11/13/96 11/13/96 11/13/96 <br /> Analyzed Date 11/13/96 11/13/96 11/13/96 11/13/96 <br /> Instrument I D # GCHP22 GCHP22 GCHP22 GCHP22 <br /> Conc Spiked 0 20 mg/Kg 0 20 mg/Kg 0 20 mg/Kg 0 60 mg/Kg <br /> LCS Result 018 018 018 055 <br /> LCS % Recov .. 90 90 so 92 <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 /> CV IA 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 /> even Follett <br /> Project Manager **MS=Matrix Spike, MSD=MS Duplicate,RPD=Relative%Difference 9611596M c1> <br />