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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 /> qwr Analytical 819 Striker Avenue,Suitt 8 Sacramento CA 95834 (916) 921 9600 FAX(916) 921 0100 <br /> Touchstone Development Client Project ID Chevron on #9-2033 <br /> P 0 Box 2554 <br /> Matrix Solid <br /> Santa Rosa, CA 95405 <br /> Attention Jeff Monroe QC Sample Group 6090608-613 Reported Sep 26, 1996 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte Benzene Toluene Ethyl Xylenes Diesel <br /> Benzene <br /> QC Batch# SP091396 SP091396 SP091396 SP091396 SP091296 <br /> 8020EXA 8020EXA 8020EXA 8020EXA 8015EXC <br /> Analy Method EPA 8020 EPA 8020 EPA 8020 EPA 8020 EPA 8015 <br /> Prep Method EPA 5030 EPA 5030 EPA 5030 EPA 5030 EPA 3550 <br /> Analyst M Brewer M Brewer M Brewer M Brewer I Dalvand <br /> MS/MSD # 6090443 6090443 6090443 6090443 6090613 <br /> Sample Conc N D N D N D N D 1800 mg/kg <br /> Prepared Date 9/13/96 9/13/96 9/13/96 9/13/96 9/12/96 <br /> Analyzed Date 9/13/96 9/13/96 9/13/96 9/13/96 9/13/96 <br /> Instrument I D # HP 5 HP 5 HP 5 HP 5 HP 3B <br /> Cone Spiked 0 40 mg/kg 0 40 mg/kg 0 40 mg/kg 1 2 mg/kg 10 mg/kg <br /> Result 025 025 027 0 81 1200 <br /> MS % Recovery 63 63 58 68 <br /> k <br /> Dup Result 024 025 028 084 1000 <br /> D % Recov 60 63 70 70 - <br /> RPD 41 00 36 36 <br /> RPD Limit 0-25 0-25 025 025 0-50 <br /> LCS # 5LCS091396 5LCS091396 5LCS091396 5LCS091396 LCS091296 <br /> Prepared Date 9/13/96 9/13/96 9/13/96 9/13/96 9/12/96 <br /> Analyzed Date 9/13/96 9/13/96 9/13/96 9/13/96 9/13/96 <br /> Instrument I D # HP 5 HP 5 HP-5 HP 5 HP 3B <br /> Cone Spiked 20ug/L 20ug/L 20ug/L 60ug/L 10 mg/kg <br /> LCS Result 19 18 18 55 98 <br /> LCS % Recov 95 90 90 92 98 <br /> 60-140 60140 60-140 60-140 50-150 <br /> LCS <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 /> wi= <br /> L, #1271 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 /> he recovery of analytes from the matrix spike does not fall within specified control limits due to matrix <br /> in erence the LCS recovery is to be used to validate the batch <br /> Melissa A Brewer **Mb=Matrix Spike MSD=MS Duplicate, RPO=Relative% Difference <br /> Client Services Representative <br /> 6090608 TOU <3> <br />