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4D <br /> 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 /> qWP Analytical 819 Striker Avenue, Suite 8 Sacramento CA 95834 (916) 921 9600 FAX(916) 921 0100 <br /> Touchstone Developments Client Project ID Chevron 9-8264/8264-1 N v <br /> 6280 Stoneridge Mall Rd , B211 Matrix Liquld <br /> Pleasanton, CA 94588 <br /> Attention Anne Marie Dockstader Work Order# 9511554-04 Reported Nov 14, 1995 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte: Benzene Toluene Ethyl Xylenes Diesel <br /> Benzene <br /> OC Batch# GC110995BTEX17A GC110995BTEX17A GC110995BTEX17A GC I 10995BTEX17A GC I 108950HBPEXA <br /> Analy Method. EPA 8020 EPA 8020 EPA 8020 EPA 8020 EPA 8015M <br /> Prep_Method: EPA 5030 EPA 5030 EPA 5030 EPA 5030 EPA 3510 <br /> Analyst J woo J Woo J Woo J Woo J Minkel <br /> MS/MSD # 951112002 951112002 951112002 951112002 BLK110895 <br /> Sample Conc.. N D N D N D N D N D <br /> Prepared Date: 11/9/95 11/9/95 11/9/95 11/9/95 11/8/95 <br /> Analyzed Date. 11/9/95 11/9/95 11/9/95 11/9/95 11/8/95 <br /> Instrument I D.# GCHP17 GCHP17 GCHP17 GCHP17 GCHP5 <br /> Conc Spiked. 10 fug/L 10 fug/L 10 fug/L 30 pg/L 1000 fug/L <br /> Result: 92 90 92 28 790 <br /> MS % Recovery 92 90 92 93 79 <br /> Dup Result: 98 97 97 29 850 <br /> MSD %Recov : 98 97 97 97 85 <br /> RPD 63 75 53 35 73 <br /> RPD Limit. 0-50 0-50 0-50 0-50 0-50 <br /> LCS # BLK102795 BLK102795 BLK102795 BLK102795 - <br /> Prepared Date. 11/9/95 11/9/95 11/9/95 11/9/95 - <br /> Analyzed Date: 11/9/95 11/9/95 11/9/95 11/9/95 - <br /> Instrument I.D.#: GCHP17 GCHP17 GCHP17 GCHP17 - <br /> Conc. Spiked- 10 fug/L 10 fug/L 10 fug/L 30 ug/L - <br /> LCS Result: 10 10 10 30 - <br /> LCS %Recov.. 100 100 100 100 - <br /> LCS 71-133 72-128 72-130 71-120 38-122 <br /> Control Limits <br /> Please Note <br /> The LCS is a control sample of known,interferent-free matrix that 1s analyzed using the same reagents, <br /> SE OIA ANALYTICAL preparation,and analytical methods employed for the samples The matrix spike 1s an aliquot of sample <br /> fon:ified 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 /> Mark J Cargasacchi <br /> Project Manager **MS=Matrix Spike, MSD=MS Duplicate,RPD=Relative%Difference 9511554 TTT -<2> <br />