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(IN <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 /> Iwo Analytical 819 Striker Avenue Suite 8 Sacramento CA 95834 (916) 921 9600 FAX(916)921 0100 <br /> 10chstone Development Client Project ID Ch - <br /> 1 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 Nil] K Nill K Nill <br /> M S/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 2 HP-2 HP-2 HP-2 <br /> Conc Spiked 0 40 mg/kg 0 40 mg/kg 0 40 mg/kg 1 2 mg/kg <br /> Result 030 030 033 098 <br /> MS % Recovery 75 75 83 82 <br /> Pup Result 032 032 036 10 <br /> D % Recov 60 80 90 83 <br /> RPD 65 65 87 20 <br /> RPD Limit 0-25 0-25 0-25 0-25 <br /> LCS # 2LCS092396 2LCS092396 2LCS092396 2LCS092396 <br /> Prepared Date 9/23/96 9/23/96 9/23/96 9/23/96 <br /> Analyzed Date 9/23/96 9/23/96 9/23/96 9/23/96 <br /> Instrument I D # HP-2 HP-2 HP 2 HP-2 <br /> Conc Spiked 20pg/L 20 jug/L 20ug/L 60pg/L <br /> LCS Result 18 19 20 61 <br /> LCS % Recov 90 95 100 102 <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 /> 14kt4-,4-(a &W-L� 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 /> interference,the LCS recovery is to be used to validate the batch <br /> Melissa A Brewer **MS=Matrix Spike,MSD=MS Duplicate,RPO=Relative%Difference <br /> Client Services Representative <br /> 6090634 TOU <10> <br />