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4 Sequoia 680 Chesaneake 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 9,573 <br /> 14W Analytical 819 Sinker Avenue Suite 8 Sacramento CA 95834 (916) 921 9600 FAX(916)921 0100 <br /> i <br /> Touchstone Developments Client Project ID Chevron 9-4183 /9-4183 <br /> 781 Kingston Matrix Solid <br /> Oakland, CA 94611 <br /> Attention Robert Mallory Work Order# 9604798 01-07 Reported Apr 15, 1996 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte Benzene Toluene Ethyl Xylenes <br /> Benzene <br /> QC Batch# GC041196BTEXEXA GC041196BTEXEXA GC041196BTEXEXA GCO41196BTEXEXA <br /> Analy Method EPA 8020 EPA 8020 EPA 8020 EPA 8020 <br /> Prep Method EPA 5030 EPA 5030 EPA 5030 EPA 5030 <br /> Analyst- D Jirsa D Jirsa D Jirsa D Jirsa <br /> MS/MSD# 960439811 960439811 960439811 960439811 <br /> Sample Conc : N D N D N D N D <br /> Prepared Date 4/11/96 4/11/96 4/11/96 4/11/96 <br /> Analyzed Date 4/11/96 4/11/96 4/11/96 4/11/96 <br /> Instrument hD # GCHP1 GCHPi GCHP1 GCHP1 <br /> Conc Spiked 0 20 mg/Kg 0 20 mg/Kg 0 20 mg/Kg 0 60 mg/Kg <br /> Result 0 16 017 017 0 51 <br /> MS % Recovery 80 85 85 B5 <br /> Dup Result 016 017 0 17 050 <br /> MSD % Recov 80 85 85 83 <br /> RPD 00 00 00 20 <br /> RPD Limit- 0-50 0-50 0-50 0-50 <br /> LCS# BLK041196 BLK041196 BLK041196 BLK041196 <br /> Prepared Date 4/11/96 4/11/96 4/11/96 4/11/96 <br /> Analyzed Date 4/11/96 4/11/96 4/11/96 4/11/96 <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 015 015 015 044 <br /> LCS % Recov 75 75 75 73 <br /> i <br /> i <br /> LCS <br /> Control Limits 50-150 50-150 50-150 50-150 <br /> i <br /> i <br /> Please Note <br /> The LCS is a control sample of known,interferent-free matrix that is analyzed using the same reagents, <br /> SEQU lA 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 /> evin ollett <br /> Project Manager *"MS=Matrix Spike,MSD=MS Duplicate,RPD=Relative%Difference 9604798 TTT <1> <br />