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Sequoia 680 Chesapeake Drive Redwood Gty, 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 /> Vchstone Development Client Project ID Chevron #9-2033 <br /> P O Box 2554 <br /> Matrix Solid <br /> Santa Rosa, CA 95405 <br /> Attention Jeff Monroe QC Sample Group 6090634-655 Reported Sep 24, 1996 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte Benzene Toluene Ethyl Xylenes <br /> Benzene <br /> QC Batch# SP092096 SP092096 SP092096 SP092096 <br /> 8020EXA 8020EXA 8020EXA 8020EXA <br /> Analy Method EPA 8020 EPA 8020 EPA 8020 EPA 8020 <br /> Prep Method EPA 5030 EPA 5030 EPA 5030 EPA 5030 <br /> Analyst K Nill K Nill K Nill K Nill <br /> MS/MSD # 6091063 6091063 6091063 6091063 <br /> Sample Conc N D N D N D N D <br /> Prepared Date 9/20/96 9/20/96 9/20/96 9/20/96 <br /> Analyzed Date 9/20/96 9/20/96 9/20/96 9/20/96 <br /> Instrument I D # HP-5 HP 5 HP 5 HP-5 <br /> Conc Spiked 0 40 mg/kg 0 40 mg/kg 0 40 mg/kg 1 2 mg/kg <br /> Result 030 031 033 098 <br /> MS % Recovery 75 78 83 82 <br /> 4up Result 031 032 034 10 <br /> % Recov 78 80 85 83 <br /> RPD 33 32 30 20 <br /> RPD Limit 025 0-25 0-25 0-25 <br /> LCS # 5LCS092096 5LCS092096 5LCS092096 5LCS092096 <br /> Prepared Date 9/20/96 9/20/96 9/20/96 9/20/96 <br /> Analyzed Date 9/20/96 9/20/96 9/20/96 9/20/96 <br /> Instrument I D # HP-5 HP-5 HP-5 HP-5 <br /> Conc Spiked 20 ug/L 20 erg/L 20 erg/L 60 pg/L <br /> LCS Result 16 16 17 52 <br /> LCS % Recov 80 80 85 87 <br /> LCS 60-140 60-140 60-140 60-140 <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 /> SEQUOIA ANALYTICAL, #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 /> e recovery of analytes from the matrix spike does not fall within specified control limits due to matrix <br /> interference,the LCS recove is to be used to validate the batch <br /> Melissa A Brewer **MS=Matrix Spike MSO=MS Duplicate, RPD=Relative %DifferenceClient Services Representative <br /> 6090634 TOU <9> <br />