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' Sequoia 680 Chesapeake Dnve Redwood City CA 94063 (415) 364 9600 FAX(4t5) 364 9233 <br /> Z 404 N Wiget Lane Walnut Creek CA 94598 (510) 988 9600 FAX (5t0) 988 9673 <br /> Analytical 8 t 9 Striker Avenue, Suite 8 Sacramento CA 95834 (916) 921 9600 FAX (916)921 0100 <br /> eraghty& Miller, Inc Client Project ID Chevron #9-4275 <br /> 050 Marina Way South Matrix Solid <br /> Richmond, CA 94804 <br /> Attention Cynthia Hilton QC Sample Group 6111101-124 Reported Dec 12, 1996 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte Benzene Toluene Ethyl Xylenes <br /> Benzene <br /> QC Batch# SP113096 SP113096 SP113096 SP113096 <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 /> ' <br /> Analyst ❑ Newcomb D Newcomb D Newcomb D Newcomb <br /> MS/MSD # 6111259 6111259 6111259 6111259 <br /> Sample Conc N D N D N D N <br /> Prepared Date 11/30/96 11/30/96 11/30/96 11/30/96 <br /> LAnalyzed Date 11/30/96 11/30/96 11/30/96 11/30/96 <br /> strument 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 040 041 040 12 <br /> MS % Recovery 100 103 100 100 <br /> IRDup Result 041 042 041 12 <br /> SD % Recov 103 105 103 100 <br /> I <br /> RPD 25 24 25 00 <br /> RPD Limit 0-25 0-25 0-25 0-25 <br /> LCS; # 4LCS113096 4LCS113096 4LCS113096 4LCS113096 <br /> Prepared Date 11/30/96 11/30/96 11/30/96 11/30/96 <br /> Analyzed Date 11/30/96 11/30/96 11/30/96 11/30/96 <br /> nstrument I D # HP-4 HP-4 HP-4 HP-4 <br /> Conc Spiked 20yg/L 20Mg/L 20pg/L 60pg/L <br /> LCS Result 19 19 18 56 <br /> LCS % Recov 95 95 90 93 <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 /> UOIA ANALYTICAL, #1271 preparation,and analytical methods employed for the samples The matrix spike is an aliquot of sample <br /> Q 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 fecove is to be used to validate the batch <br /> elissa A Brewer **MS=Matrix Spike, MSD=MS Duplicate, RPD=Relative% Difference <br /> Client Services Representative <br /> 6111101 GER <9> <br />