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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 /> a- )IS Analytical 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 /> 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 D Newcomb D Newcomb D Newcomb D Newcomb <br /> MS/MSD # 7070738 7070738 7070738 7070738 <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-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 072 074 074 23 <br /> Recovery 180 185 185 192 <br /> Dup Result 070 073 072 22 <br /> MSD % Recov 175 183 180 183 <br /> RPD 28 14 27 44 <br /> RPD Limit 0-25 0-25 0-25 0-25 <br /> LCS # 5LCS071797 5LCS071797 5LCS071797 5LCS071797 <br /> Prepared Date 7/17/97 7/17/97 7/17/97 7/17/97 <br /> Analyzes! Date 7/17/97 7/17/97 7/17/97 7/17/97 <br /> Instrument i D # HP 5 HP-5 HP-5 HP-5 <br /> Conc Spiked 20pg/L 20ug/L 20/tg/L 60,ug/L <br /> LCS Result 19 19 19 59 <br /> LCS % Recov 95 95 95 98 <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 1s analyzed using the same reagents, <br /> SIR OIA 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 /> J, the recovery of analytes from the matrix spike does not fall within specified control limits due to matrix <br /> erference the LCS recovery is to be used to validate the batch <br /> Melissa A Brewer *x MS=Matrix Spike, MSD=MS Duplicate, RPD=Relative%Difference <br /> Client Services Representative <br /> 7070726 GER <5> <br />