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Sequoia 680 Chesapeake 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 9673 <br /> Analytical 819 Striker Avenue Suite 8 Sacramento CA 95834 (916) 921 9600 FAX(916)921 0100 <br /> 9chstone Development Client ec <br /> Pro t ID Chevron <br /> P O Box 2554 f #9- <br /> 2033 <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 /> CSC Batch# SP091996 SP091996 SP091996 SP091996 <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 NIII K Nill K Nill K Nill <br /> MS/MSD # 6090950 6090950 6090950 6090950 <br /> Sample Conc N D N D N D N D <br /> Prepared Date 9/19/96 9/19/96 9/19/96 9/19/96 <br /> Analyzed Date 9/19/96 9/19/96 9/19/96 9/19/96 <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 034 035 037 11 <br /> MS % Recovery 85 88 93 92 <br /> MDup Result 036 037 038 12 <br /> D % Recov 90 93 95 100 <br /> RPD 57 56 27 87 <br /> RPD Limit 0-25 025 0-25 0-25 <br /> LCS # 2LCS091996 2LCS091996 2LCS091906 2LCS091996 <br /> Prepared Date 9/19/96 9/19/96 9/19/96 9/19/96 <br /> Analyzed Date 9/19/96 9/19/96 9/19/96 9/19/96 <br /> Instrument I D # HP-2 HP-2 HP-2 HP 2 <br /> Conc Spiked 20ftg/L 20ug/L 20pg/L 60pg/L <br /> LCS Result 18 18 19 58 <br /> LCS % Recov 90 90 95 97 <br /> LCS 60140 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 />' S QIJOIA 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 /> ecovery of analytes from the matrix spike does not fall within specified control limits due to matrix <br /> interference,the LCS recovery1s to be used to validate the batch <br /> Melissa A Brewer ** <br /> Mb=Matrix Spike, MSD=MS-Duplicate RP❑=Relative% Difference <br /> Client Services Representative <br /> 6090634 TOU <7> <br />