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' Sequoia 680 Chesapeake Drive Redwood City CA 94063 (415) 364 9600 FAX(415) 364 9233 <br /> 1 404 N Wiget Lane Walnut Creek CA 94598 (510) 988 9600 FAX(510) 988 9673 <br /> Analytical 819 Sinker Avenue Suite a Sacramento CA 95834 (916) 921 9600 FAX(916)921 0100 <br /> eraghty& Mil(er, Inc Client Project ID Chevron #9-4275 <br /> 05Q Marina Way South Matrix Solid <br /> """'Richmond, CA 94804 <br /> Attention Cynthia Hilton QC Sample Group 6111101-124 Reported Dec 12, 1996 <br /> 1 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte Benzene Toluene Ethyl Xylenes <br /> Benzene <br /> QC Batch# SP112596 SP112596 SP112596 SP112596 <br /> 8020EXA 8020EXA 8020EXA 8020EXA <br /> Analy Method EPA 8020 EPA 8020 EPA 6020 EPA 8020 <br /> Prep Method EPA 5030 EPA 5030 EPA 5030 EPA 5030 <br /> Analyst D Newcomb ❑ Newcomb D Newcomb D Newcomb <br /> MS/MSD # 6111114 6111114 6111114 6111114 <br /> Sample Conc NO N D ND ND <br /> Prepared Date 11/25/96 11/25/96 11/25/96 11/25/96 <br /> IAnalyzed Date 11/25/96 11/25/96 11/25/96 11/25/96 <br /> nstrument 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 044 046 046 1 4 <br /> MS % Recovery 110 115 115 117 <br /> 141Dup Result 045 046 046 14 <br /> 11) % Recov 113 115 115 117 <br />' RPD 23 00 00 00 <br /> RPD Limit 0-25 0-25 0-25 0-25 <br /> LCS # 4LCS112596 4LCS112596 4LCS112596 4LCS112596 <br /> Prepared Date 11/25/96 11/25/96 11/25/96 11/25/96 <br /> Analyzed Date 11/25/96 11/25/96 11/25/96 11/25/96 <br /> nstrument I D # HP 4 HP 4 HP-4 HP-4 <br /> Conc Spiked 20,ug/L 20 Ng/L 20pg/L 60 pg/L <br /> LCS Result 18 19 18 56 <br /> LCS % Recov 90 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 /> VU0.1AANALYTICAL, #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 /> e covery 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 match <br /> kelissa A Brewer **MS=Matrix Spike, MSD MS Duplicate RPD=Relative% Difference <br /> Client Services Representative <br />' 6111101 GER <6> <br />