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Sequoia 680 Chesapeake Drive Redwood City CA 94063 (415) 364 9600 FAX (415) 364 9233 <br /> 404 N Wiget Cane Walnut Creek CA 94598 (510) 988 9600 FAX (510) 988 9673 <br /> (i) Ana ytlea1 819 Striker Avenue Suite 8 Sacramento CA 95834 (916) 921 9600 FAX (916) 921 0100 <br /> Geraghty & Miller, Inc Client Project ID Chevron #9-4275 <br /> 1050 Marina Way South Matrix Solid <br /> Richmond, CA 94804 <br /> Attention Aaron O'Brien QC Sample Group 7070726-734 Reported Jul 25, 1997 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte Benzene Toluene Ethyl Xylenes <br /> Benzene <br /> QC Batch# SP071797 SP071797 SP071797 SP071797 <br /> 6020EXA 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 Nlll K NII] <br /> MS/MSD # 7070659 7070659 7070659 7070659 <br /> Sample Conc N D N D N D N D <br /> Prepared Date 7/17/97 7/17/97 7/17/97 7/17/97 <br /> Analyzed Date 7/17/97 7/17/97 7/17/97 7/17/97 <br /> Instrument I D # HP-4 HP-4 HP-4 HP-4 <br /> Conc Spiked 0 40 mg/kg 0 40 mg/kg 0 40 mg/kg 1 2 mg/kg <br /> Result 085 086 082 26 <br /> I� X. Recovery 213 215 205 217 <br /> 6Dup Result 082 084 081 26 <br /> MSD % Recov 205 210 203 217 <br /> RPD 36 24 12 00 <br /> RPD Limit 0-25 0-25 0-25 0-25 <br /> LCS ,# 4LCS071797 4LCS071797 4LCS071797 4LCS071797 <br /> Prepared Date 7/17/97 7/17/97 7/17/97 7/17/97 <br /> Analyzed Date 7/17/97 7/17/97 7/17/97 7/17/97 <br /> Instrument I D # HP-4 HP-4 HP 4 HP-4 <br /> Conc Spiked 20yg/L 20ug/L 20pg/L 60,ug/L <br /> LCS Result 18 19 17 54 <br /> LCS % Recov 90 95 85 90 <br /> LCS 50-150 50-150 50-150 50-150 <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 /> S001A 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 /> nthe 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, RPD=Relative%Difference <br /> Client Services Representative <br /> 7070726 GEA <4> <br />