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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 Sinker Avenac Suite 8 Sacramento CA 95834 (916) 921 9600 FAX (916)921 0100 <br /> eraghty& Miller, Inc Client Project 1D Chevron #9-4275 <br /> 050 Marina Way South Matrix Solid <br /> Ichmond, 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# SP112696 SP112696 SP112696 SP112696 <br /> 8020EXA 8020EXA 8020EXA 8020EXA <br /> Analy Method EPA 8020 EPA 8020 EPA 8020 EPA 6020 <br /> Prep Method EPA 5030 EPA 5030 EPA 5030 EPA 5030 <br /> ' <br /> Analyst D Newcomb D Newcomb D Newcomb D Newcomb <br /> MS/MSD # 6111642 6111642 6111642 6111642 <br /> Sample Cone N D N D N D N 1) <br /> Prepared Date 11/26/96 11/26/96 11/26/96 11/26/96 <br /> LAnalyzed Date 11/26/96 11/26/96 11/26/96 11/26/96 <br /> strument 1 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 047 046 051 14 <br /> MS % Recovery 118 115 128 117 <br /> IRSDup Result 047 046 051 14 <br /> D % Recov 118 115 128 117 <br /> RPD 00 00 00 00 <br /> RPD Limit 0-25 0-25 0-25 0-25 <br /> LCS # 5LCS112696 5LCS112696 5LCS112696 5LCS112696 <br /> Prepared Date 11/26/96 11/26/96 11/26/96 11/26/96 <br /> Analyzed Date 11/26/96 11/26/96 11/26/96 11/26/96 <br /> nstrument I D # HP-5 HP-5 HP-5 HP-5 <br /> Conc Spiked 20ug/L 20ug/L 20ug/L 60ug/L <br /> LCS Result 19 18 20 57 <br /> LCS % R@COV 95 90 100 95 <br />"Imits <br /> 60-140 60-140 60-140 60-140 <br /> Please Note <br /> The LCS is a control sample of known,interferent-free matrix that is analyzed using the same reagents, <br /> VUOIA ANALYTICAL, #1271 preparation,and analytical methods employed for the samples The matrix spike is an aliquot of sample <br /> Qfortified with known quantities of specific compounds and subjected to the entire analytical procedure If <br /> the 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 W*MS=Matrix Spike,MSD=MS Duplicate, RPD=Relative%Difference <br /> Client Services Representative <br /> 6111101 GER <7> <br />